File: | build/source/clang/lib/Sema/SemaTemplate.cpp |
Warning: | line 1419, column 5 Value stored to 'RD' is never read |
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1 | //===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | //===----------------------------------------------------------------------===// |
7 | // |
8 | // This file implements semantic analysis for C++ templates. |
9 | //===----------------------------------------------------------------------===// |
10 | |
11 | #include "TreeTransform.h" |
12 | #include "clang/AST/ASTConsumer.h" |
13 | #include "clang/AST/ASTContext.h" |
14 | #include "clang/AST/Decl.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/TemplateName.h" |
21 | #include "clang/AST/TypeVisitor.h" |
22 | #include "clang/Basic/Builtins.h" |
23 | #include "clang/Basic/DiagnosticSema.h" |
24 | #include "clang/Basic/LangOptions.h" |
25 | #include "clang/Basic/PartialDiagnostic.h" |
26 | #include "clang/Basic/Stack.h" |
27 | #include "clang/Basic/TargetInfo.h" |
28 | #include "clang/Sema/DeclSpec.h" |
29 | #include "clang/Sema/EnterExpressionEvaluationContext.h" |
30 | #include "clang/Sema/Initialization.h" |
31 | #include "clang/Sema/Lookup.h" |
32 | #include "clang/Sema/Overload.h" |
33 | #include "clang/Sema/ParsedTemplate.h" |
34 | #include "clang/Sema/Scope.h" |
35 | #include "clang/Sema/SemaInternal.h" |
36 | #include "clang/Sema/Template.h" |
37 | #include "clang/Sema/TemplateDeduction.h" |
38 | #include "llvm/ADT/SmallBitVector.h" |
39 | #include "llvm/ADT/SmallString.h" |
40 | #include "llvm/ADT/StringExtras.h" |
41 | |
42 | #include <iterator> |
43 | #include <optional> |
44 | using namespace clang; |
45 | using namespace sema; |
46 | |
47 | // Exported for use by Parser. |
48 | SourceRange |
49 | clang::getTemplateParamsRange(TemplateParameterList const * const *Ps, |
50 | unsigned N) { |
51 | if (!N) return SourceRange(); |
52 | return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc()); |
53 | } |
54 | |
55 | unsigned Sema::getTemplateDepth(Scope *S) const { |
56 | unsigned Depth = 0; |
57 | |
58 | // Each template parameter scope represents one level of template parameter |
59 | // depth. |
60 | for (Scope *TempParamScope = S->getTemplateParamParent(); TempParamScope; |
61 | TempParamScope = TempParamScope->getParent()->getTemplateParamParent()) { |
62 | ++Depth; |
63 | } |
64 | |
65 | // Note that there are template parameters with the given depth. |
66 | auto ParamsAtDepth = [&](unsigned D) { Depth = std::max(Depth, D + 1); }; |
67 | |
68 | // Look for parameters of an enclosing generic lambda. We don't create a |
69 | // template parameter scope for these. |
70 | for (FunctionScopeInfo *FSI : getFunctionScopes()) { |
71 | if (auto *LSI = dyn_cast<LambdaScopeInfo>(FSI)) { |
72 | if (!LSI->TemplateParams.empty()) { |
73 | ParamsAtDepth(LSI->AutoTemplateParameterDepth); |
74 | break; |
75 | } |
76 | if (LSI->GLTemplateParameterList) { |
77 | ParamsAtDepth(LSI->GLTemplateParameterList->getDepth()); |
78 | break; |
79 | } |
80 | } |
81 | } |
82 | |
83 | // Look for parameters of an enclosing terse function template. We don't |
84 | // create a template parameter scope for these either. |
85 | for (const InventedTemplateParameterInfo &Info : |
86 | getInventedParameterInfos()) { |
87 | if (!Info.TemplateParams.empty()) { |
88 | ParamsAtDepth(Info.AutoTemplateParameterDepth); |
89 | break; |
90 | } |
91 | } |
92 | |
93 | return Depth; |
94 | } |
95 | |
96 | /// \brief Determine whether the declaration found is acceptable as the name |
97 | /// of a template and, if so, return that template declaration. Otherwise, |
98 | /// returns null. |
99 | /// |
100 | /// Note that this may return an UnresolvedUsingValueDecl if AllowDependent |
101 | /// is true. In all other cases it will return a TemplateDecl (or null). |
102 | NamedDecl *Sema::getAsTemplateNameDecl(NamedDecl *D, |
103 | bool AllowFunctionTemplates, |
104 | bool AllowDependent) { |
105 | D = D->getUnderlyingDecl(); |
106 | |
107 | if (isa<TemplateDecl>(D)) { |
108 | if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D)) |
109 | return nullptr; |
110 | |
111 | return D; |
112 | } |
113 | |
114 | if (const auto *Record = dyn_cast<CXXRecordDecl>(D)) { |
115 | // C++ [temp.local]p1: |
116 | // Like normal (non-template) classes, class templates have an |
117 | // injected-class-name (Clause 9). The injected-class-name |
118 | // can be used with or without a template-argument-list. When |
119 | // it is used without a template-argument-list, it is |
120 | // equivalent to the injected-class-name followed by the |
121 | // template-parameters of the class template enclosed in |
122 | // <>. When it is used with a template-argument-list, it |
123 | // refers to the specified class template specialization, |
124 | // which could be the current specialization or another |
125 | // specialization. |
126 | if (Record->isInjectedClassName()) { |
127 | Record = cast<CXXRecordDecl>(Record->getDeclContext()); |
128 | if (Record->getDescribedClassTemplate()) |
129 | return Record->getDescribedClassTemplate(); |
130 | |
131 | if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(Record)) |
132 | return Spec->getSpecializedTemplate(); |
133 | } |
134 | |
135 | return nullptr; |
136 | } |
137 | |
138 | // 'using Dependent::foo;' can resolve to a template name. |
139 | // 'using typename Dependent::foo;' cannot (not even if 'foo' is an |
140 | // injected-class-name). |
141 | if (AllowDependent && isa<UnresolvedUsingValueDecl>(D)) |
142 | return D; |
143 | |
144 | return nullptr; |
145 | } |
146 | |
147 | void Sema::FilterAcceptableTemplateNames(LookupResult &R, |
148 | bool AllowFunctionTemplates, |
149 | bool AllowDependent) { |
150 | LookupResult::Filter filter = R.makeFilter(); |
151 | while (filter.hasNext()) { |
152 | NamedDecl *Orig = filter.next(); |
153 | if (!getAsTemplateNameDecl(Orig, AllowFunctionTemplates, AllowDependent)) |
154 | filter.erase(); |
155 | } |
156 | filter.done(); |
157 | } |
158 | |
159 | bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R, |
160 | bool AllowFunctionTemplates, |
161 | bool AllowDependent, |
162 | bool AllowNonTemplateFunctions) { |
163 | for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { |
164 | if (getAsTemplateNameDecl(*I, AllowFunctionTemplates, AllowDependent)) |
165 | return true; |
166 | if (AllowNonTemplateFunctions && |
167 | isa<FunctionDecl>((*I)->getUnderlyingDecl())) |
168 | return true; |
169 | } |
170 | |
171 | return false; |
172 | } |
173 | |
174 | TemplateNameKind Sema::isTemplateName(Scope *S, |
175 | CXXScopeSpec &SS, |
176 | bool hasTemplateKeyword, |
177 | const UnqualifiedId &Name, |
178 | ParsedType ObjectTypePtr, |
179 | bool EnteringContext, |
180 | TemplateTy &TemplateResult, |
181 | bool &MemberOfUnknownSpecialization, |
182 | bool Disambiguation) { |
183 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 183, __extension__ __PRETTY_FUNCTION__ )); |
184 | |
185 | DeclarationName TName; |
186 | MemberOfUnknownSpecialization = false; |
187 | |
188 | switch (Name.getKind()) { |
189 | case UnqualifiedIdKind::IK_Identifier: |
190 | TName = DeclarationName(Name.Identifier); |
191 | break; |
192 | |
193 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
194 | TName = Context.DeclarationNames.getCXXOperatorName( |
195 | Name.OperatorFunctionId.Operator); |
196 | break; |
197 | |
198 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
199 | TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier); |
200 | break; |
201 | |
202 | default: |
203 | return TNK_Non_template; |
204 | } |
205 | |
206 | QualType ObjectType = ObjectTypePtr.get(); |
207 | |
208 | AssumedTemplateKind AssumedTemplate; |
209 | LookupResult R(*this, TName, Name.getBeginLoc(), LookupOrdinaryName); |
210 | if (LookupTemplateName(R, S, SS, ObjectType, EnteringContext, |
211 | MemberOfUnknownSpecialization, SourceLocation(), |
212 | &AssumedTemplate, |
213 | /*AllowTypoCorrection=*/!Disambiguation)) |
214 | return TNK_Non_template; |
215 | |
216 | if (AssumedTemplate != AssumedTemplateKind::None) { |
217 | TemplateResult = TemplateTy::make(Context.getAssumedTemplateName(TName)); |
218 | // Let the parser know whether we found nothing or found functions; if we |
219 | // found nothing, we want to more carefully check whether this is actually |
220 | // a function template name versus some other kind of undeclared identifier. |
221 | return AssumedTemplate == AssumedTemplateKind::FoundNothing |
222 | ? TNK_Undeclared_template |
223 | : TNK_Function_template; |
224 | } |
225 | |
226 | if (R.empty()) |
227 | return TNK_Non_template; |
228 | |
229 | NamedDecl *D = nullptr; |
230 | UsingShadowDecl *FoundUsingShadow = dyn_cast<UsingShadowDecl>(*R.begin()); |
231 | if (R.isAmbiguous()) { |
232 | // If we got an ambiguity involving a non-function template, treat this |
233 | // as a template name, and pick an arbitrary template for error recovery. |
234 | bool AnyFunctionTemplates = false; |
235 | for (NamedDecl *FoundD : R) { |
236 | if (NamedDecl *FoundTemplate = getAsTemplateNameDecl(FoundD)) { |
237 | if (isa<FunctionTemplateDecl>(FoundTemplate)) |
238 | AnyFunctionTemplates = true; |
239 | else { |
240 | D = FoundTemplate; |
241 | FoundUsingShadow = dyn_cast<UsingShadowDecl>(FoundD); |
242 | break; |
243 | } |
244 | } |
245 | } |
246 | |
247 | // If we didn't find any templates at all, this isn't a template name. |
248 | // Leave the ambiguity for a later lookup to diagnose. |
249 | if (!D && !AnyFunctionTemplates) { |
250 | R.suppressDiagnostics(); |
251 | return TNK_Non_template; |
252 | } |
253 | |
254 | // If the only templates were function templates, filter out the rest. |
255 | // We'll diagnose the ambiguity later. |
256 | if (!D) |
257 | FilterAcceptableTemplateNames(R); |
258 | } |
259 | |
260 | // At this point, we have either picked a single template name declaration D |
261 | // or we have a non-empty set of results R containing either one template name |
262 | // declaration or a set of function templates. |
263 | |
264 | TemplateName Template; |
265 | TemplateNameKind TemplateKind; |
266 | |
267 | unsigned ResultCount = R.end() - R.begin(); |
268 | if (!D && ResultCount > 1) { |
269 | // We assume that we'll preserve the qualifier from a function |
270 | // template name in other ways. |
271 | Template = Context.getOverloadedTemplateName(R.begin(), R.end()); |
272 | TemplateKind = TNK_Function_template; |
273 | |
274 | // We'll do this lookup again later. |
275 | R.suppressDiagnostics(); |
276 | } else { |
277 | if (!D) { |
278 | D = getAsTemplateNameDecl(*R.begin()); |
279 | assert(D && "unambiguous result is not a template name")(static_cast <bool> (D && "unambiguous result is not a template name" ) ? void (0) : __assert_fail ("D && \"unambiguous result is not a template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 279, __extension__ __PRETTY_FUNCTION__ )); |
280 | } |
281 | |
282 | if (isa<UnresolvedUsingValueDecl>(D)) { |
283 | // We don't yet know whether this is a template-name or not. |
284 | MemberOfUnknownSpecialization = true; |
285 | return TNK_Non_template; |
286 | } |
287 | |
288 | TemplateDecl *TD = cast<TemplateDecl>(D); |
289 | Template = |
290 | FoundUsingShadow ? TemplateName(FoundUsingShadow) : TemplateName(TD); |
291 | assert(!FoundUsingShadow || FoundUsingShadow->getTargetDecl() == TD)(static_cast <bool> (!FoundUsingShadow || FoundUsingShadow ->getTargetDecl() == TD) ? void (0) : __assert_fail ("!FoundUsingShadow || FoundUsingShadow->getTargetDecl() == TD" , "clang/lib/Sema/SemaTemplate.cpp", 291, __extension__ __PRETTY_FUNCTION__ )); |
292 | if (SS.isSet() && !SS.isInvalid()) { |
293 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); |
294 | Template = Context.getQualifiedTemplateName(Qualifier, hasTemplateKeyword, |
295 | Template); |
296 | } |
297 | |
298 | if (isa<FunctionTemplateDecl>(TD)) { |
299 | TemplateKind = TNK_Function_template; |
300 | |
301 | // We'll do this lookup again later. |
302 | R.suppressDiagnostics(); |
303 | } else { |
304 | 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) || isa<ConceptDecl>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)" , "clang/lib/Sema/SemaTemplate.cpp", 306, __extension__ __PRETTY_FUNCTION__ )) |
305 | isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||(static_cast <bool> (isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl >(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl >(TD) || isa<ConceptDecl>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)" , "clang/lib/Sema/SemaTemplate.cpp", 306, __extension__ __PRETTY_FUNCTION__ )) |
306 | isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD))(static_cast <bool> (isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl >(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl >(TD) || isa<ConceptDecl>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)" , "clang/lib/Sema/SemaTemplate.cpp", 306, __extension__ __PRETTY_FUNCTION__ )); |
307 | TemplateKind = |
308 | isa<VarTemplateDecl>(TD) ? TNK_Var_template : |
309 | isa<ConceptDecl>(TD) ? TNK_Concept_template : |
310 | TNK_Type_template; |
311 | } |
312 | } |
313 | |
314 | TemplateResult = TemplateTy::make(Template); |
315 | return TemplateKind; |
316 | } |
317 | |
318 | bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name, |
319 | SourceLocation NameLoc, CXXScopeSpec &SS, |
320 | ParsedTemplateTy *Template /*=nullptr*/) { |
321 | bool MemberOfUnknownSpecialization = false; |
322 | |
323 | // We could use redeclaration lookup here, but we don't need to: the |
324 | // syntactic form of a deduction guide is enough to identify it even |
325 | // if we can't look up the template name at all. |
326 | LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName); |
327 | if (LookupTemplateName(R, S, SS, /*ObjectType*/ QualType(), |
328 | /*EnteringContext*/ false, |
329 | MemberOfUnknownSpecialization)) |
330 | return false; |
331 | |
332 | if (R.empty()) return false; |
333 | if (R.isAmbiguous()) { |
334 | // FIXME: Diagnose an ambiguity if we find at least one template. |
335 | R.suppressDiagnostics(); |
336 | return false; |
337 | } |
338 | |
339 | // We only treat template-names that name type templates as valid deduction |
340 | // guide names. |
341 | TemplateDecl *TD = R.getAsSingle<TemplateDecl>(); |
342 | if (!TD || !getAsTypeTemplateDecl(TD)) |
343 | return false; |
344 | |
345 | if (Template) |
346 | *Template = TemplateTy::make(TemplateName(TD)); |
347 | return true; |
348 | } |
349 | |
350 | bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II, |
351 | SourceLocation IILoc, |
352 | Scope *S, |
353 | const CXXScopeSpec *SS, |
354 | TemplateTy &SuggestedTemplate, |
355 | TemplateNameKind &SuggestedKind) { |
356 | // We can't recover unless there's a dependent scope specifier preceding the |
357 | // template name. |
358 | // FIXME: Typo correction? |
359 | if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) || |
360 | computeDeclContext(*SS)) |
361 | return false; |
362 | |
363 | // The code is missing a 'template' keyword prior to the dependent template |
364 | // name. |
365 | NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep(); |
366 | Diag(IILoc, diag::err_template_kw_missing) |
367 | << Qualifier << II.getName() |
368 | << FixItHint::CreateInsertion(IILoc, "template "); |
369 | SuggestedTemplate |
370 | = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II)); |
371 | SuggestedKind = TNK_Dependent_template_name; |
372 | return true; |
373 | } |
374 | |
375 | bool Sema::LookupTemplateName(LookupResult &Found, |
376 | Scope *S, CXXScopeSpec &SS, |
377 | QualType ObjectType, |
378 | bool EnteringContext, |
379 | bool &MemberOfUnknownSpecialization, |
380 | RequiredTemplateKind RequiredTemplate, |
381 | AssumedTemplateKind *ATK, |
382 | bool AllowTypoCorrection) { |
383 | if (ATK) |
384 | *ATK = AssumedTemplateKind::None; |
385 | |
386 | if (SS.isInvalid()) |
387 | return true; |
388 | |
389 | Found.setTemplateNameLookup(true); |
390 | |
391 | // Determine where to perform name lookup |
392 | MemberOfUnknownSpecialization = false; |
393 | DeclContext *LookupCtx = nullptr; |
394 | bool IsDependent = false; |
395 | if (!ObjectType.isNull()) { |
396 | // This nested-name-specifier occurs in a member access expression, e.g., |
397 | // x->B::f, and we are looking into the type of the object. |
398 | assert(SS.isEmpty() && "ObjectType and scope specifier cannot coexist")(static_cast <bool> (SS.isEmpty() && "ObjectType and scope specifier cannot coexist" ) ? void (0) : __assert_fail ("SS.isEmpty() && \"ObjectType and scope specifier cannot coexist\"" , "clang/lib/Sema/SemaTemplate.cpp", 398, __extension__ __PRETTY_FUNCTION__ )); |
399 | LookupCtx = computeDeclContext(ObjectType); |
400 | IsDependent = !LookupCtx && ObjectType->isDependentType(); |
401 | assert((IsDependent || !ObjectType->isIncompleteType() ||(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )) |
402 | !ObjectType->getAs<TagType>() ||(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )) |
403 | ObjectType->castAs<TagType>()->isBeingDefined()) &&(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )) |
404 | "Caller should have completed object type")(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )); |
405 | |
406 | // Template names cannot appear inside an Objective-C class or object type |
407 | // or a vector type. |
408 | // |
409 | // FIXME: This is wrong. For example: |
410 | // |
411 | // template<typename T> using Vec = T __attribute__((ext_vector_type(4))); |
412 | // Vec<int> vi; |
413 | // vi.Vec<int>::~Vec<int>(); |
414 | // |
415 | // ... should be accepted but we will not treat 'Vec' as a template name |
416 | // here. The right thing to do would be to check if the name is a valid |
417 | // vector component name, and look up a template name if not. And similarly |
418 | // for lookups into Objective-C class and object types, where the same |
419 | // problem can arise. |
420 | if (ObjectType->isObjCObjectOrInterfaceType() || |
421 | ObjectType->isVectorType()) { |
422 | Found.clear(); |
423 | return false; |
424 | } |
425 | } else if (SS.isNotEmpty()) { |
426 | // This nested-name-specifier occurs after another nested-name-specifier, |
427 | // so long into the context associated with the prior nested-name-specifier. |
428 | LookupCtx = computeDeclContext(SS, EnteringContext); |
429 | IsDependent = !LookupCtx && isDependentScopeSpecifier(SS); |
430 | |
431 | // The declaration context must be complete. |
432 | if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx)) |
433 | return true; |
434 | } |
435 | |
436 | bool ObjectTypeSearchedInScope = false; |
437 | bool AllowFunctionTemplatesInLookup = true; |
438 | if (LookupCtx) { |
439 | // Perform "qualified" name lookup into the declaration context we |
440 | // computed, which is either the type of the base of a member access |
441 | // expression or the declaration context associated with a prior |
442 | // nested-name-specifier. |
443 | LookupQualifiedName(Found, LookupCtx); |
444 | |
445 | // FIXME: The C++ standard does not clearly specify what happens in the |
446 | // case where the object type is dependent, and implementations vary. In |
447 | // Clang, we treat a name after a . or -> as a template-name if lookup |
448 | // finds a non-dependent member or member of the current instantiation that |
449 | // is a type template, or finds no such members and lookup in the context |
450 | // of the postfix-expression finds a type template. In the latter case, the |
451 | // name is nonetheless dependent, and we may resolve it to a member of an |
452 | // unknown specialization when we come to instantiate the template. |
453 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); |
454 | } |
455 | |
456 | if (SS.isEmpty() && (ObjectType.isNull() || Found.empty())) { |
457 | // C++ [basic.lookup.classref]p1: |
458 | // In a class member access expression (5.2.5), if the . or -> token is |
459 | // immediately followed by an identifier followed by a <, the |
460 | // identifier must be looked up to determine whether the < is the |
461 | // beginning of a template argument list (14.2) or a less-than operator. |
462 | // The identifier is first looked up in the class of the object |
463 | // expression. If the identifier is not found, it is then looked up in |
464 | // the context of the entire postfix-expression and shall name a class |
465 | // template. |
466 | if (S) |
467 | LookupName(Found, S); |
468 | |
469 | if (!ObjectType.isNull()) { |
470 | // FIXME: We should filter out all non-type templates here, particularly |
471 | // variable templates and concepts. But the exclusion of alias templates |
472 | // and template template parameters is a wording defect. |
473 | AllowFunctionTemplatesInLookup = false; |
474 | ObjectTypeSearchedInScope = true; |
475 | } |
476 | |
477 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); |
478 | } |
479 | |
480 | if (Found.isAmbiguous()) |
481 | return false; |
482 | |
483 | if (ATK && SS.isEmpty() && ObjectType.isNull() && |
484 | !RequiredTemplate.hasTemplateKeyword()) { |
485 | // C++2a [temp.names]p2: |
486 | // A name is also considered to refer to a template if it is an |
487 | // unqualified-id followed by a < and name lookup finds either one or more |
488 | // functions or finds nothing. |
489 | // |
490 | // To keep our behavior consistent, we apply the "finds nothing" part in |
491 | // all language modes, and diagnose the empty lookup in ActOnCallExpr if we |
492 | // successfully form a call to an undeclared template-id. |
493 | bool AllFunctions = |
494 | getLangOpts().CPlusPlus20 && llvm::all_of(Found, [](NamedDecl *ND) { |
495 | return isa<FunctionDecl>(ND->getUnderlyingDecl()); |
496 | }); |
497 | if (AllFunctions || (Found.empty() && !IsDependent)) { |
498 | // If lookup found any functions, or if this is a name that can only be |
499 | // used for a function, then strongly assume this is a function |
500 | // template-id. |
501 | *ATK = (Found.empty() && Found.getLookupName().isIdentifier()) |
502 | ? AssumedTemplateKind::FoundNothing |
503 | : AssumedTemplateKind::FoundFunctions; |
504 | Found.clear(); |
505 | return false; |
506 | } |
507 | } |
508 | |
509 | if (Found.empty() && !IsDependent && AllowTypoCorrection) { |
510 | // If we did not find any names, and this is not a disambiguation, attempt |
511 | // to correct any typos. |
512 | DeclarationName Name = Found.getLookupName(); |
513 | Found.clear(); |
514 | // Simple filter callback that, for keywords, only accepts the C++ *_cast |
515 | DefaultFilterCCC FilterCCC{}; |
516 | FilterCCC.WantTypeSpecifiers = false; |
517 | FilterCCC.WantExpressionKeywords = false; |
518 | FilterCCC.WantRemainingKeywords = false; |
519 | FilterCCC.WantCXXNamedCasts = true; |
520 | if (TypoCorrection Corrected = |
521 | CorrectTypo(Found.getLookupNameInfo(), Found.getLookupKind(), S, |
522 | &SS, FilterCCC, CTK_ErrorRecovery, LookupCtx)) { |
523 | if (auto *ND = Corrected.getFoundDecl()) |
524 | Found.addDecl(ND); |
525 | FilterAcceptableTemplateNames(Found); |
526 | if (Found.isAmbiguous()) { |
527 | Found.clear(); |
528 | } else if (!Found.empty()) { |
529 | Found.setLookupName(Corrected.getCorrection()); |
530 | if (LookupCtx) { |
531 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); |
532 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
533 | Name.getAsString() == CorrectedStr; |
534 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest) |
535 | << Name << LookupCtx << DroppedSpecifier |
536 | << SS.getRange()); |
537 | } else { |
538 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name); |
539 | } |
540 | } |
541 | } |
542 | } |
543 | |
544 | NamedDecl *ExampleLookupResult = |
545 | Found.empty() ? nullptr : Found.getRepresentativeDecl(); |
546 | FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup); |
547 | if (Found.empty()) { |
548 | if (IsDependent) { |
549 | MemberOfUnknownSpecialization = true; |
550 | return false; |
551 | } |
552 | |
553 | // If a 'template' keyword was used, a lookup that finds only non-template |
554 | // names is an error. |
555 | if (ExampleLookupResult && RequiredTemplate) { |
556 | Diag(Found.getNameLoc(), diag::err_template_kw_refers_to_non_template) |
557 | << Found.getLookupName() << SS.getRange() |
558 | << RequiredTemplate.hasTemplateKeyword() |
559 | << RequiredTemplate.getTemplateKeywordLoc(); |
560 | Diag(ExampleLookupResult->getUnderlyingDecl()->getLocation(), |
561 | diag::note_template_kw_refers_to_non_template) |
562 | << Found.getLookupName(); |
563 | return true; |
564 | } |
565 | |
566 | return false; |
567 | } |
568 | |
569 | if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope && |
570 | !getLangOpts().CPlusPlus11) { |
571 | // C++03 [basic.lookup.classref]p1: |
572 | // [...] If the lookup in the class of the object expression finds a |
573 | // template, the name is also looked up in the context of the entire |
574 | // postfix-expression and [...] |
575 | // |
576 | // Note: C++11 does not perform this second lookup. |
577 | LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(), |
578 | LookupOrdinaryName); |
579 | FoundOuter.setTemplateNameLookup(true); |
580 | LookupName(FoundOuter, S); |
581 | // FIXME: We silently accept an ambiguous lookup here, in violation of |
582 | // [basic.lookup]/1. |
583 | FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false); |
584 | |
585 | NamedDecl *OuterTemplate; |
586 | if (FoundOuter.empty()) { |
587 | // - if the name is not found, the name found in the class of the |
588 | // object expression is used, otherwise |
589 | } else if (FoundOuter.isAmbiguous() || !FoundOuter.isSingleResult() || |
590 | !(OuterTemplate = |
591 | getAsTemplateNameDecl(FoundOuter.getFoundDecl()))) { |
592 | // - if the name is found in the context of the entire |
593 | // postfix-expression and does not name a class template, the name |
594 | // found in the class of the object expression is used, otherwise |
595 | FoundOuter.clear(); |
596 | } else if (!Found.isSuppressingDiagnostics()) { |
597 | // - if the name found is a class template, it must refer to the same |
598 | // entity as the one found in the class of the object expression, |
599 | // otherwise the program is ill-formed. |
600 | if (!Found.isSingleResult() || |
601 | getAsTemplateNameDecl(Found.getFoundDecl())->getCanonicalDecl() != |
602 | OuterTemplate->getCanonicalDecl()) { |
603 | Diag(Found.getNameLoc(), |
604 | diag::ext_nested_name_member_ref_lookup_ambiguous) |
605 | << Found.getLookupName() |
606 | << ObjectType; |
607 | Diag(Found.getRepresentativeDecl()->getLocation(), |
608 | diag::note_ambig_member_ref_object_type) |
609 | << ObjectType; |
610 | Diag(FoundOuter.getFoundDecl()->getLocation(), |
611 | diag::note_ambig_member_ref_scope); |
612 | |
613 | // Recover by taking the template that we found in the object |
614 | // expression's type. |
615 | } |
616 | } |
617 | } |
618 | |
619 | return false; |
620 | } |
621 | |
622 | void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName, |
623 | SourceLocation Less, |
624 | SourceLocation Greater) { |
625 | if (TemplateName.isInvalid()) |
626 | return; |
627 | |
628 | DeclarationNameInfo NameInfo; |
629 | CXXScopeSpec SS; |
630 | LookupNameKind LookupKind; |
631 | |
632 | DeclContext *LookupCtx = nullptr; |
633 | NamedDecl *Found = nullptr; |
634 | bool MissingTemplateKeyword = false; |
635 | |
636 | // Figure out what name we looked up. |
637 | if (auto *DRE = dyn_cast<DeclRefExpr>(TemplateName.get())) { |
638 | NameInfo = DRE->getNameInfo(); |
639 | SS.Adopt(DRE->getQualifierLoc()); |
640 | LookupKind = LookupOrdinaryName; |
641 | Found = DRE->getFoundDecl(); |
642 | } else if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) { |
643 | NameInfo = ME->getMemberNameInfo(); |
644 | SS.Adopt(ME->getQualifierLoc()); |
645 | LookupKind = LookupMemberName; |
646 | LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl(); |
647 | Found = ME->getMemberDecl(); |
648 | } else if (auto *DSDRE = |
649 | dyn_cast<DependentScopeDeclRefExpr>(TemplateName.get())) { |
650 | NameInfo = DSDRE->getNameInfo(); |
651 | SS.Adopt(DSDRE->getQualifierLoc()); |
652 | MissingTemplateKeyword = true; |
653 | } else if (auto *DSME = |
654 | dyn_cast<CXXDependentScopeMemberExpr>(TemplateName.get())) { |
655 | NameInfo = DSME->getMemberNameInfo(); |
656 | SS.Adopt(DSME->getQualifierLoc()); |
657 | MissingTemplateKeyword = true; |
658 | } else { |
659 | llvm_unreachable("unexpected kind of potential template name")::llvm::llvm_unreachable_internal("unexpected kind of potential template name" , "clang/lib/Sema/SemaTemplate.cpp", 659); |
660 | } |
661 | |
662 | // If this is a dependent-scope lookup, diagnose that the 'template' keyword |
663 | // was missing. |
664 | if (MissingTemplateKeyword) { |
665 | Diag(NameInfo.getBeginLoc(), diag::err_template_kw_missing) |
666 | << "" << NameInfo.getName().getAsString() << SourceRange(Less, Greater); |
667 | return; |
668 | } |
669 | |
670 | // Try to correct the name by looking for templates and C++ named casts. |
671 | struct TemplateCandidateFilter : CorrectionCandidateCallback { |
672 | Sema &S; |
673 | TemplateCandidateFilter(Sema &S) : S(S) { |
674 | WantTypeSpecifiers = false; |
675 | WantExpressionKeywords = false; |
676 | WantRemainingKeywords = false; |
677 | WantCXXNamedCasts = true; |
678 | }; |
679 | bool ValidateCandidate(const TypoCorrection &Candidate) override { |
680 | if (auto *ND = Candidate.getCorrectionDecl()) |
681 | return S.getAsTemplateNameDecl(ND); |
682 | return Candidate.isKeyword(); |
683 | } |
684 | |
685 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
686 | return std::make_unique<TemplateCandidateFilter>(*this); |
687 | } |
688 | }; |
689 | |
690 | DeclarationName Name = NameInfo.getName(); |
691 | TemplateCandidateFilter CCC(*this); |
692 | if (TypoCorrection Corrected = CorrectTypo(NameInfo, LookupKind, S, &SS, CCC, |
693 | CTK_ErrorRecovery, LookupCtx)) { |
694 | auto *ND = Corrected.getFoundDecl(); |
695 | if (ND) |
696 | ND = getAsTemplateNameDecl(ND); |
697 | if (ND || Corrected.isKeyword()) { |
698 | if (LookupCtx) { |
699 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); |
700 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
701 | Name.getAsString() == CorrectedStr; |
702 | diagnoseTypo(Corrected, |
703 | PDiag(diag::err_non_template_in_member_template_id_suggest) |
704 | << Name << LookupCtx << DroppedSpecifier |
705 | << SS.getRange(), false); |
706 | } else { |
707 | diagnoseTypo(Corrected, |
708 | PDiag(diag::err_non_template_in_template_id_suggest) |
709 | << Name, false); |
710 | } |
711 | if (Found) |
712 | Diag(Found->getLocation(), |
713 | diag::note_non_template_in_template_id_found); |
714 | return; |
715 | } |
716 | } |
717 | |
718 | Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id) |
719 | << Name << SourceRange(Less, Greater); |
720 | if (Found) |
721 | Diag(Found->getLocation(), diag::note_non_template_in_template_id_found); |
722 | } |
723 | |
724 | /// ActOnDependentIdExpression - Handle a dependent id-expression that |
725 | /// was just parsed. This is only possible with an explicit scope |
726 | /// specifier naming a dependent type. |
727 | ExprResult |
728 | Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS, |
729 | SourceLocation TemplateKWLoc, |
730 | const DeclarationNameInfo &NameInfo, |
731 | bool isAddressOfOperand, |
732 | const TemplateArgumentListInfo *TemplateArgs) { |
733 | DeclContext *DC = getFunctionLevelDeclContext(); |
734 | |
735 | // C++11 [expr.prim.general]p12: |
736 | // An id-expression that denotes a non-static data member or non-static |
737 | // member function of a class can only be used: |
738 | // (...) |
739 | // - if that id-expression denotes a non-static data member and it |
740 | // appears in an unevaluated operand. |
741 | // |
742 | // If this might be the case, form a DependentScopeDeclRefExpr instead of a |
743 | // CXXDependentScopeMemberExpr. The former can instantiate to either |
744 | // DeclRefExpr or MemberExpr depending on lookup results, while the latter is |
745 | // always a MemberExpr. |
746 | bool MightBeCxx11UnevalField = |
747 | getLangOpts().CPlusPlus11 && isUnevaluatedContext(); |
748 | |
749 | // Check if the nested name specifier is an enum type. |
750 | bool IsEnum = false; |
751 | if (NestedNameSpecifier *NNS = SS.getScopeRep()) |
752 | IsEnum = isa_and_nonnull<EnumType>(NNS->getAsType()); |
753 | |
754 | if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum && |
755 | isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) { |
756 | QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(); |
757 | |
758 | // Since the 'this' expression is synthesized, we don't need to |
759 | // perform the double-lookup check. |
760 | NamedDecl *FirstQualifierInScope = nullptr; |
761 | |
762 | return CXXDependentScopeMemberExpr::Create( |
763 | Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true, |
764 | /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc, |
765 | FirstQualifierInScope, NameInfo, TemplateArgs); |
766 | } |
767 | |
768 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); |
769 | } |
770 | |
771 | ExprResult |
772 | Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS, |
773 | SourceLocation TemplateKWLoc, |
774 | const DeclarationNameInfo &NameInfo, |
775 | const TemplateArgumentListInfo *TemplateArgs) { |
776 | // DependentScopeDeclRefExpr::Create requires a valid QualifierLoc |
777 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
778 | if (!QualifierLoc) |
779 | return ExprError(); |
780 | |
781 | return DependentScopeDeclRefExpr::Create( |
782 | Context, QualifierLoc, TemplateKWLoc, NameInfo, TemplateArgs); |
783 | } |
784 | |
785 | |
786 | /// Determine whether we would be unable to instantiate this template (because |
787 | /// it either has no definition, or is in the process of being instantiated). |
788 | bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation, |
789 | NamedDecl *Instantiation, |
790 | bool InstantiatedFromMember, |
791 | const NamedDecl *Pattern, |
792 | const NamedDecl *PatternDef, |
793 | TemplateSpecializationKind TSK, |
794 | bool Complain /*= true*/) { |
795 | 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)" , "clang/lib/Sema/SemaTemplate.cpp", 796, __extension__ __PRETTY_FUNCTION__ )) |
796 | 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)" , "clang/lib/Sema/SemaTemplate.cpp", 796, __extension__ __PRETTY_FUNCTION__ )); |
797 | |
798 | bool IsEntityBeingDefined = false; |
799 | if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef)) |
800 | IsEntityBeingDefined = TD->isBeingDefined(); |
801 | |
802 | if (PatternDef && !IsEntityBeingDefined) { |
803 | NamedDecl *SuggestedDef = nullptr; |
804 | if (!hasReachableDefinition(const_cast<NamedDecl *>(PatternDef), |
805 | &SuggestedDef, |
806 | /*OnlyNeedComplete*/ false)) { |
807 | // If we're allowed to diagnose this and recover, do so. |
808 | bool Recover = Complain && !isSFINAEContext(); |
809 | if (Complain) |
810 | diagnoseMissingImport(PointOfInstantiation, SuggestedDef, |
811 | Sema::MissingImportKind::Definition, Recover); |
812 | return !Recover; |
813 | } |
814 | return false; |
815 | } |
816 | |
817 | if (!Complain || (PatternDef && PatternDef->isInvalidDecl())) |
818 | return true; |
819 | |
820 | std::optional<unsigned> Note; |
821 | QualType InstantiationTy; |
822 | if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation)) |
823 | InstantiationTy = Context.getTypeDeclType(TD); |
824 | if (PatternDef) { |
825 | Diag(PointOfInstantiation, |
826 | diag::err_template_instantiate_within_definition) |
827 | << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation) |
828 | << InstantiationTy; |
829 | // Not much point in noting the template declaration here, since |
830 | // we're lexically inside it. |
831 | Instantiation->setInvalidDecl(); |
832 | } else if (InstantiatedFromMember) { |
833 | if (isa<FunctionDecl>(Instantiation)) { |
834 | Diag(PointOfInstantiation, |
835 | diag::err_explicit_instantiation_undefined_member) |
836 | << /*member function*/ 1 << Instantiation->getDeclName() |
837 | << Instantiation->getDeclContext(); |
838 | Note = diag::note_explicit_instantiation_here; |
839 | } else { |
840 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 840, __extension__ __PRETTY_FUNCTION__ )); |
841 | Diag(PointOfInstantiation, |
842 | diag::err_implicit_instantiate_member_undefined) |
843 | << InstantiationTy; |
844 | Note = diag::note_member_declared_at; |
845 | } |
846 | } else { |
847 | if (isa<FunctionDecl>(Instantiation)) { |
848 | Diag(PointOfInstantiation, |
849 | diag::err_explicit_instantiation_undefined_func_template) |
850 | << Pattern; |
851 | Note = diag::note_explicit_instantiation_here; |
852 | } else if (isa<TagDecl>(Instantiation)) { |
853 | Diag(PointOfInstantiation, diag::err_template_instantiate_undefined) |
854 | << (TSK != TSK_ImplicitInstantiation) |
855 | << InstantiationTy; |
856 | Note = diag::note_template_decl_here; |
857 | } else { |
858 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 858, __extension__ __PRETTY_FUNCTION__ )); |
859 | if (isa<VarTemplateSpecializationDecl>(Instantiation)) { |
860 | Diag(PointOfInstantiation, |
861 | diag::err_explicit_instantiation_undefined_var_template) |
862 | << Instantiation; |
863 | Instantiation->setInvalidDecl(); |
864 | } else |
865 | Diag(PointOfInstantiation, |
866 | diag::err_explicit_instantiation_undefined_member) |
867 | << /*static data member*/ 2 << Instantiation->getDeclName() |
868 | << Instantiation->getDeclContext(); |
869 | Note = diag::note_explicit_instantiation_here; |
870 | } |
871 | } |
872 | if (Note) // Diagnostics were emitted. |
873 | Diag(Pattern->getLocation(), *Note); |
874 | |
875 | // In general, Instantiation isn't marked invalid to get more than one |
876 | // error for multiple undefined instantiations. But the code that does |
877 | // explicit declaration -> explicit definition conversion can't handle |
878 | // invalid declarations, so mark as invalid in that case. |
879 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
880 | Instantiation->setInvalidDecl(); |
881 | return true; |
882 | } |
883 | |
884 | /// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining |
885 | /// that the template parameter 'PrevDecl' is being shadowed by a new |
886 | /// declaration at location Loc. Returns true to indicate that this is |
887 | /// an error, and false otherwise. |
888 | void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) { |
889 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 889, __extension__ __PRETTY_FUNCTION__ )); |
890 | |
891 | // C++ [temp.local]p4: |
892 | // A template-parameter shall not be redeclared within its |
893 | // scope (including nested scopes). |
894 | // |
895 | // Make this a warning when MSVC compatibility is requested. |
896 | unsigned DiagId = getLangOpts().MSVCCompat ? diag::ext_template_param_shadow |
897 | : diag::err_template_param_shadow; |
898 | Diag(Loc, DiagId) << cast<NamedDecl>(PrevDecl)->getDeclName(); |
899 | Diag(PrevDecl->getLocation(), diag::note_template_param_here); |
900 | } |
901 | |
902 | /// AdjustDeclIfTemplate - If the given decl happens to be a template, reset |
903 | /// the parameter D to reference the templated declaration and return a pointer |
904 | /// to the template declaration. Otherwise, do nothing to D and return null. |
905 | TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) { |
906 | if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) { |
907 | D = Temp->getTemplatedDecl(); |
908 | return Temp; |
909 | } |
910 | return nullptr; |
911 | } |
912 | |
913 | ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion( |
914 | SourceLocation EllipsisLoc) const { |
915 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 916, __extension__ __PRETTY_FUNCTION__ )) |
916 | "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\"" , "clang/lib/Sema/SemaTemplate.cpp", 916, __extension__ __PRETTY_FUNCTION__ )); |
917 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 918, __extension__ __PRETTY_FUNCTION__ )) |
918 | "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\"" , "clang/lib/Sema/SemaTemplate.cpp", 918, __extension__ __PRETTY_FUNCTION__ )); |
919 | ParsedTemplateArgument Result(*this); |
920 | Result.EllipsisLoc = EllipsisLoc; |
921 | return Result; |
922 | } |
923 | |
924 | static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef, |
925 | const ParsedTemplateArgument &Arg) { |
926 | |
927 | switch (Arg.getKind()) { |
928 | case ParsedTemplateArgument::Type: { |
929 | TypeSourceInfo *DI; |
930 | QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI); |
931 | if (!DI) |
932 | DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation()); |
933 | return TemplateArgumentLoc(TemplateArgument(T), DI); |
934 | } |
935 | |
936 | case ParsedTemplateArgument::NonType: { |
937 | Expr *E = static_cast<Expr *>(Arg.getAsExpr()); |
938 | return TemplateArgumentLoc(TemplateArgument(E), E); |
939 | } |
940 | |
941 | case ParsedTemplateArgument::Template: { |
942 | TemplateName Template = Arg.getAsTemplate().get(); |
943 | TemplateArgument TArg; |
944 | if (Arg.getEllipsisLoc().isValid()) |
945 | TArg = TemplateArgument(Template, std::optional<unsigned int>()); |
946 | else |
947 | TArg = Template; |
948 | return TemplateArgumentLoc( |
949 | SemaRef.Context, TArg, |
950 | Arg.getScopeSpec().getWithLocInContext(SemaRef.Context), |
951 | Arg.getLocation(), Arg.getEllipsisLoc()); |
952 | } |
953 | } |
954 | |
955 | llvm_unreachable("Unhandled parsed template argument")::llvm::llvm_unreachable_internal("Unhandled parsed template argument" , "clang/lib/Sema/SemaTemplate.cpp", 955); |
956 | } |
957 | |
958 | /// Translates template arguments as provided by the parser |
959 | /// into template arguments used by semantic analysis. |
960 | void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn, |
961 | TemplateArgumentListInfo &TemplateArgs) { |
962 | for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I) |
963 | TemplateArgs.addArgument(translateTemplateArgument(*this, |
964 | TemplateArgsIn[I])); |
965 | } |
966 | |
967 | static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S, |
968 | SourceLocation Loc, |
969 | IdentifierInfo *Name) { |
970 | NamedDecl *PrevDecl = SemaRef.LookupSingleName( |
971 | S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration); |
972 | if (PrevDecl && PrevDecl->isTemplateParameter()) |
973 | SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl); |
974 | } |
975 | |
976 | /// Convert a parsed type into a parsed template argument. This is mostly |
977 | /// trivial, except that we may have parsed a C++17 deduced class template |
978 | /// specialization type, in which case we should form a template template |
979 | /// argument instead of a type template argument. |
980 | ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) { |
981 | TypeSourceInfo *TInfo; |
982 | QualType T = GetTypeFromParser(ParsedType.get(), &TInfo); |
983 | if (T.isNull()) |
984 | return ParsedTemplateArgument(); |
985 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 985, __extension__ __PRETTY_FUNCTION__ )); |
986 | |
987 | // If we might have formed a deduced template specialization type, convert |
988 | // it to a template template argument. |
989 | if (getLangOpts().CPlusPlus17) { |
990 | TypeLoc TL = TInfo->getTypeLoc(); |
991 | SourceLocation EllipsisLoc; |
992 | if (auto PET = TL.getAs<PackExpansionTypeLoc>()) { |
993 | EllipsisLoc = PET.getEllipsisLoc(); |
994 | TL = PET.getPatternLoc(); |
995 | } |
996 | |
997 | CXXScopeSpec SS; |
998 | if (auto ET = TL.getAs<ElaboratedTypeLoc>()) { |
999 | SS.Adopt(ET.getQualifierLoc()); |
1000 | TL = ET.getNamedTypeLoc(); |
1001 | } |
1002 | |
1003 | if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) { |
1004 | TemplateName Name = DTST.getTypePtr()->getTemplateName(); |
1005 | if (SS.isSet()) |
1006 | Name = Context.getQualifiedTemplateName(SS.getScopeRep(), |
1007 | /*HasTemplateKeyword=*/false, |
1008 | Name); |
1009 | ParsedTemplateArgument Result(SS, TemplateTy::make(Name), |
1010 | DTST.getTemplateNameLoc()); |
1011 | if (EllipsisLoc.isValid()) |
1012 | Result = Result.getTemplatePackExpansion(EllipsisLoc); |
1013 | return Result; |
1014 | } |
1015 | } |
1016 | |
1017 | // This is a normal type template argument. Note, if the type template |
1018 | // argument is an injected-class-name for a template, it has a dual nature |
1019 | // and can be used as either a type or a template. We handle that in |
1020 | // convertTypeTemplateArgumentToTemplate. |
1021 | return ParsedTemplateArgument(ParsedTemplateArgument::Type, |
1022 | ParsedType.get().getAsOpaquePtr(), |
1023 | TInfo->getTypeLoc().getBeginLoc()); |
1024 | } |
1025 | |
1026 | /// ActOnTypeParameter - Called when a C++ template type parameter |
1027 | /// (e.g., "typename T") has been parsed. Typename specifies whether |
1028 | /// the keyword "typename" was used to declare the type parameter |
1029 | /// (otherwise, "class" was used), and KeyLoc is the location of the |
1030 | /// "class" or "typename" keyword. ParamName is the name of the |
1031 | /// parameter (NULL indicates an unnamed template parameter) and |
1032 | /// ParamNameLoc is the location of the parameter name (if any). |
1033 | /// If the type parameter has a default argument, it will be added |
1034 | /// later via ActOnTypeParameterDefault. |
1035 | NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename, |
1036 | SourceLocation EllipsisLoc, |
1037 | SourceLocation KeyLoc, |
1038 | IdentifierInfo *ParamName, |
1039 | SourceLocation ParamNameLoc, |
1040 | unsigned Depth, unsigned Position, |
1041 | SourceLocation EqualLoc, |
1042 | ParsedType DefaultArg, |
1043 | bool HasTypeConstraint) { |
1044 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1045, __extension__ __PRETTY_FUNCTION__ )) |
1045 | "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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1045, __extension__ __PRETTY_FUNCTION__ )); |
1046 | |
1047 | bool IsParameterPack = EllipsisLoc.isValid(); |
1048 | TemplateTypeParmDecl *Param |
1049 | = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
1050 | KeyLoc, ParamNameLoc, Depth, Position, |
1051 | ParamName, Typename, IsParameterPack, |
1052 | HasTypeConstraint); |
1053 | Param->setAccess(AS_public); |
1054 | |
1055 | if (Param->isParameterPack()) |
1056 | if (auto *LSI = getEnclosingLambda()) |
1057 | LSI->LocalPacks.push_back(Param); |
1058 | |
1059 | if (ParamName) { |
1060 | maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName); |
1061 | |
1062 | // Add the template parameter into the current scope. |
1063 | S->AddDecl(Param); |
1064 | IdResolver.AddDecl(Param); |
1065 | } |
1066 | |
1067 | // C++0x [temp.param]p9: |
1068 | // A default template-argument may be specified for any kind of |
1069 | // template-parameter that is not a template parameter pack. |
1070 | if (DefaultArg && IsParameterPack) { |
1071 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
1072 | DefaultArg = nullptr; |
1073 | } |
1074 | |
1075 | // Handle the default argument, if provided. |
1076 | if (DefaultArg) { |
1077 | TypeSourceInfo *DefaultTInfo; |
1078 | GetTypeFromParser(DefaultArg, &DefaultTInfo); |
1079 | |
1080 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 1080, __extension__ __PRETTY_FUNCTION__ )); |
1081 | |
1082 | // Check for unexpanded parameter packs. |
1083 | if (DiagnoseUnexpandedParameterPack(ParamNameLoc, DefaultTInfo, |
1084 | UPPC_DefaultArgument)) |
1085 | return Param; |
1086 | |
1087 | // Check the template argument itself. |
1088 | if (CheckTemplateArgument(DefaultTInfo)) { |
1089 | Param->setInvalidDecl(); |
1090 | return Param; |
1091 | } |
1092 | |
1093 | Param->setDefaultArgument(DefaultTInfo); |
1094 | } |
1095 | |
1096 | return Param; |
1097 | } |
1098 | |
1099 | /// Convert the parser's template argument list representation into our form. |
1100 | static TemplateArgumentListInfo |
1101 | makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) { |
1102 | TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc, |
1103 | TemplateId.RAngleLoc); |
1104 | ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(), |
1105 | TemplateId.NumArgs); |
1106 | S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs); |
1107 | return TemplateArgs; |
1108 | } |
1109 | |
1110 | bool Sema::CheckTypeConstraint(TemplateIdAnnotation *TypeConstr) { |
1111 | |
1112 | TemplateName TN = TypeConstr->Template.get(); |
1113 | ConceptDecl *CD = cast<ConceptDecl>(TN.getAsTemplateDecl()); |
1114 | |
1115 | // C++2a [temp.param]p4: |
1116 | // [...] The concept designated by a type-constraint shall be a type |
1117 | // concept ([temp.concept]). |
1118 | if (!CD->isTypeConcept()) { |
1119 | Diag(TypeConstr->TemplateNameLoc, |
1120 | diag::err_type_constraint_non_type_concept); |
1121 | return true; |
1122 | } |
1123 | |
1124 | bool WereArgsSpecified = TypeConstr->LAngleLoc.isValid(); |
1125 | |
1126 | if (!WereArgsSpecified && |
1127 | CD->getTemplateParameters()->getMinRequiredArguments() > 1) { |
1128 | Diag(TypeConstr->TemplateNameLoc, |
1129 | diag::err_type_constraint_missing_arguments) |
1130 | << CD; |
1131 | return true; |
1132 | } |
1133 | return false; |
1134 | } |
1135 | |
1136 | bool Sema::ActOnTypeConstraint(const CXXScopeSpec &SS, |
1137 | TemplateIdAnnotation *TypeConstr, |
1138 | TemplateTypeParmDecl *ConstrainedParameter, |
1139 | SourceLocation EllipsisLoc) { |
1140 | return BuildTypeConstraint(SS, TypeConstr, ConstrainedParameter, EllipsisLoc, |
1141 | false); |
1142 | } |
1143 | |
1144 | bool Sema::BuildTypeConstraint(const CXXScopeSpec &SS, |
1145 | TemplateIdAnnotation *TypeConstr, |
1146 | TemplateTypeParmDecl *ConstrainedParameter, |
1147 | SourceLocation EllipsisLoc, |
1148 | bool AllowUnexpandedPack) { |
1149 | |
1150 | if (CheckTypeConstraint(TypeConstr)) |
1151 | return true; |
1152 | |
1153 | TemplateName TN = TypeConstr->Template.get(); |
1154 | ConceptDecl *CD = cast<ConceptDecl>(TN.getAsTemplateDecl()); |
1155 | |
1156 | DeclarationNameInfo ConceptName(DeclarationName(TypeConstr->Name), |
1157 | TypeConstr->TemplateNameLoc); |
1158 | |
1159 | TemplateArgumentListInfo TemplateArgs; |
1160 | if (TypeConstr->LAngleLoc.isValid()) { |
1161 | TemplateArgs = |
1162 | makeTemplateArgumentListInfo(*this, *TypeConstr); |
1163 | |
1164 | if (EllipsisLoc.isInvalid() && !AllowUnexpandedPack) { |
1165 | for (TemplateArgumentLoc Arg : TemplateArgs.arguments()) { |
1166 | if (DiagnoseUnexpandedParameterPack(Arg, UPPC_TypeConstraint)) |
1167 | return true; |
1168 | } |
1169 | } |
1170 | } |
1171 | return AttachTypeConstraint( |
1172 | SS.isSet() ? SS.getWithLocInContext(Context) : NestedNameSpecifierLoc(), |
1173 | ConceptName, CD, |
1174 | TypeConstr->LAngleLoc.isValid() ? &TemplateArgs : nullptr, |
1175 | ConstrainedParameter, EllipsisLoc); |
1176 | } |
1177 | |
1178 | template<typename ArgumentLocAppender> |
1179 | static ExprResult formImmediatelyDeclaredConstraint( |
1180 | Sema &S, NestedNameSpecifierLoc NS, DeclarationNameInfo NameInfo, |
1181 | ConceptDecl *NamedConcept, SourceLocation LAngleLoc, |
1182 | SourceLocation RAngleLoc, QualType ConstrainedType, |
1183 | SourceLocation ParamNameLoc, ArgumentLocAppender Appender, |
1184 | SourceLocation EllipsisLoc) { |
1185 | |
1186 | TemplateArgumentListInfo ConstraintArgs; |
1187 | ConstraintArgs.addArgument( |
1188 | S.getTrivialTemplateArgumentLoc(TemplateArgument(ConstrainedType), |
1189 | /*NTTPType=*/QualType(), ParamNameLoc)); |
1190 | |
1191 | ConstraintArgs.setRAngleLoc(RAngleLoc); |
1192 | ConstraintArgs.setLAngleLoc(LAngleLoc); |
1193 | Appender(ConstraintArgs); |
1194 | |
1195 | // C++2a [temp.param]p4: |
1196 | // [...] This constraint-expression E is called the immediately-declared |
1197 | // constraint of T. [...] |
1198 | CXXScopeSpec SS; |
1199 | SS.Adopt(NS); |
1200 | ExprResult ImmediatelyDeclaredConstraint = S.CheckConceptTemplateId( |
1201 | SS, /*TemplateKWLoc=*/SourceLocation(), NameInfo, |
1202 | /*FoundDecl=*/NamedConcept, NamedConcept, &ConstraintArgs); |
1203 | if (ImmediatelyDeclaredConstraint.isInvalid() || !EllipsisLoc.isValid()) |
1204 | return ImmediatelyDeclaredConstraint; |
1205 | |
1206 | // C++2a [temp.param]p4: |
1207 | // [...] If T is not a pack, then E is E', otherwise E is (E' && ...). |
1208 | // |
1209 | // We have the following case: |
1210 | // |
1211 | // template<typename T> concept C1 = true; |
1212 | // template<C1... T> struct s1; |
1213 | // |
1214 | // The constraint: (C1<T> && ...) |
1215 | // |
1216 | // Note that the type of C1<T> is known to be 'bool', so we don't need to do |
1217 | // any unqualified lookups for 'operator&&' here. |
1218 | return S.BuildCXXFoldExpr(/*UnqualifiedLookup=*/nullptr, |
1219 | /*LParenLoc=*/SourceLocation(), |
1220 | ImmediatelyDeclaredConstraint.get(), BO_LAnd, |
1221 | EllipsisLoc, /*RHS=*/nullptr, |
1222 | /*RParenLoc=*/SourceLocation(), |
1223 | /*NumExpansions=*/std::nullopt); |
1224 | } |
1225 | |
1226 | /// Attach a type-constraint to a template parameter. |
1227 | /// \returns true if an error occurred. This can happen if the |
1228 | /// immediately-declared constraint could not be formed (e.g. incorrect number |
1229 | /// of arguments for the named concept). |
1230 | bool Sema::AttachTypeConstraint(NestedNameSpecifierLoc NS, |
1231 | DeclarationNameInfo NameInfo, |
1232 | ConceptDecl *NamedConcept, |
1233 | const TemplateArgumentListInfo *TemplateArgs, |
1234 | TemplateTypeParmDecl *ConstrainedParameter, |
1235 | SourceLocation EllipsisLoc) { |
1236 | // C++2a [temp.param]p4: |
1237 | // [...] If Q is of the form C<A1, ..., An>, then let E' be |
1238 | // C<T, A1, ..., An>. Otherwise, let E' be C<T>. [...] |
1239 | const ASTTemplateArgumentListInfo *ArgsAsWritten = |
1240 | TemplateArgs ? ASTTemplateArgumentListInfo::Create(Context, |
1241 | *TemplateArgs) : nullptr; |
1242 | |
1243 | QualType ParamAsArgument(ConstrainedParameter->getTypeForDecl(), 0); |
1244 | |
1245 | ExprResult ImmediatelyDeclaredConstraint = |
1246 | formImmediatelyDeclaredConstraint( |
1247 | *this, NS, NameInfo, NamedConcept, |
1248 | TemplateArgs ? TemplateArgs->getLAngleLoc() : SourceLocation(), |
1249 | TemplateArgs ? TemplateArgs->getRAngleLoc() : SourceLocation(), |
1250 | ParamAsArgument, ConstrainedParameter->getLocation(), |
1251 | [&] (TemplateArgumentListInfo &ConstraintArgs) { |
1252 | if (TemplateArgs) |
1253 | for (const auto &ArgLoc : TemplateArgs->arguments()) |
1254 | ConstraintArgs.addArgument(ArgLoc); |
1255 | }, EllipsisLoc); |
1256 | if (ImmediatelyDeclaredConstraint.isInvalid()) |
1257 | return true; |
1258 | |
1259 | ConstrainedParameter->setTypeConstraint(NS, NameInfo, |
1260 | /*FoundDecl=*/NamedConcept, |
1261 | NamedConcept, ArgsAsWritten, |
1262 | ImmediatelyDeclaredConstraint.get()); |
1263 | return false; |
1264 | } |
1265 | |
1266 | bool Sema::AttachTypeConstraint(AutoTypeLoc TL, |
1267 | NonTypeTemplateParmDecl *NewConstrainedParm, |
1268 | NonTypeTemplateParmDecl *OrigConstrainedParm, |
1269 | SourceLocation EllipsisLoc) { |
1270 | if (NewConstrainedParm->getType() != TL.getType() || |
1271 | TL.getAutoKeyword() != AutoTypeKeyword::Auto) { |
1272 | Diag(NewConstrainedParm->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), |
1273 | diag::err_unsupported_placeholder_constraint) |
1274 | << NewConstrainedParm->getTypeSourceInfo() |
1275 | ->getTypeLoc() |
1276 | .getSourceRange(); |
1277 | return true; |
1278 | } |
1279 | // FIXME: Concepts: This should be the type of the placeholder, but this is |
1280 | // unclear in the wording right now. |
1281 | DeclRefExpr *Ref = |
1282 | BuildDeclRefExpr(OrigConstrainedParm, OrigConstrainedParm->getType(), |
1283 | VK_PRValue, OrigConstrainedParm->getLocation()); |
1284 | if (!Ref) |
1285 | return true; |
1286 | ExprResult ImmediatelyDeclaredConstraint = formImmediatelyDeclaredConstraint( |
1287 | *this, TL.getNestedNameSpecifierLoc(), TL.getConceptNameInfo(), |
1288 | TL.getNamedConcept(), TL.getLAngleLoc(), TL.getRAngleLoc(), |
1289 | BuildDecltypeType(Ref), OrigConstrainedParm->getLocation(), |
1290 | [&](TemplateArgumentListInfo &ConstraintArgs) { |
1291 | for (unsigned I = 0, C = TL.getNumArgs(); I != C; ++I) |
1292 | ConstraintArgs.addArgument(TL.getArgLoc(I)); |
1293 | }, |
1294 | EllipsisLoc); |
1295 | if (ImmediatelyDeclaredConstraint.isInvalid() || |
1296 | !ImmediatelyDeclaredConstraint.isUsable()) |
1297 | return true; |
1298 | |
1299 | NewConstrainedParm->setPlaceholderTypeConstraint( |
1300 | ImmediatelyDeclaredConstraint.get()); |
1301 | return false; |
1302 | } |
1303 | |
1304 | /// Check that the type of a non-type template parameter is |
1305 | /// well-formed. |
1306 | /// |
1307 | /// \returns the (possibly-promoted) parameter type if valid; |
1308 | /// otherwise, produces a diagnostic and returns a NULL type. |
1309 | QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI, |
1310 | SourceLocation Loc) { |
1311 | if (TSI->getType()->isUndeducedType()) { |
1312 | // C++17 [temp.dep.expr]p3: |
1313 | // An id-expression is type-dependent if it contains |
1314 | // - an identifier associated by name lookup with a non-type |
1315 | // template-parameter declared with a type that contains a |
1316 | // placeholder type (7.1.7.4), |
1317 | TSI = SubstAutoTypeSourceInfoDependent(TSI); |
1318 | } |
1319 | |
1320 | return CheckNonTypeTemplateParameterType(TSI->getType(), Loc); |
1321 | } |
1322 | |
1323 | /// Require the given type to be a structural type, and diagnose if it is not. |
1324 | /// |
1325 | /// \return \c true if an error was produced. |
1326 | bool Sema::RequireStructuralType(QualType T, SourceLocation Loc) { |
1327 | if (T->isDependentType()) |
1328 | return false; |
1329 | |
1330 | if (RequireCompleteType(Loc, T, diag::err_template_nontype_parm_incomplete)) |
1331 | return true; |
1332 | |
1333 | if (T->isStructuralType()) |
1334 | return false; |
1335 | |
1336 | // Structural types are required to be object types or lvalue references. |
1337 | if (T->isRValueReferenceType()) { |
1338 | Diag(Loc, diag::err_template_nontype_parm_rvalue_ref) << T; |
1339 | return true; |
1340 | } |
1341 | |
1342 | // Don't mention structural types in our diagnostic prior to C++20. Also, |
1343 | // there's not much more we can say about non-scalar non-class types -- |
1344 | // because we can't see functions or arrays here, those can only be language |
1345 | // extensions. |
1346 | if (!getLangOpts().CPlusPlus20 || |
1347 | (!T->isScalarType() && !T->isRecordType())) { |
1348 | Diag(Loc, diag::err_template_nontype_parm_bad_type) << T; |
1349 | return true; |
1350 | } |
1351 | |
1352 | // Structural types are required to be literal types. |
1353 | if (RequireLiteralType(Loc, T, diag::err_template_nontype_parm_not_literal)) |
1354 | return true; |
1355 | |
1356 | Diag(Loc, diag::err_template_nontype_parm_not_structural) << T; |
1357 | |
1358 | // Drill down into the reason why the class is non-structural. |
1359 | while (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) { |
1360 | // All members are required to be public and non-mutable, and can't be of |
1361 | // rvalue reference type. Check these conditions first to prefer a "local" |
1362 | // reason over a more distant one. |
1363 | for (const FieldDecl *FD : RD->fields()) { |
1364 | if (FD->getAccess() != AS_public) { |
1365 | Diag(FD->getLocation(), diag::note_not_structural_non_public) << T << 0; |
1366 | return true; |
1367 | } |
1368 | if (FD->isMutable()) { |
1369 | Diag(FD->getLocation(), diag::note_not_structural_mutable_field) << T; |
1370 | return true; |
1371 | } |
1372 | if (FD->getType()->isRValueReferenceType()) { |
1373 | Diag(FD->getLocation(), diag::note_not_structural_rvalue_ref_field) |
1374 | << T; |
1375 | return true; |
1376 | } |
1377 | } |
1378 | |
1379 | // All bases are required to be public. |
1380 | for (const auto &BaseSpec : RD->bases()) { |
1381 | if (BaseSpec.getAccessSpecifier() != AS_public) { |
1382 | Diag(BaseSpec.getBaseTypeLoc(), diag::note_not_structural_non_public) |
1383 | << T << 1; |
1384 | return true; |
1385 | } |
1386 | } |
1387 | |
1388 | // All subobjects are required to be of structural types. |
1389 | SourceLocation SubLoc; |
1390 | QualType SubType; |
1391 | int Kind = -1; |
1392 | |
1393 | for (const FieldDecl *FD : RD->fields()) { |
1394 | QualType T = Context.getBaseElementType(FD->getType()); |
1395 | if (!T->isStructuralType()) { |
1396 | SubLoc = FD->getLocation(); |
1397 | SubType = T; |
1398 | Kind = 0; |
1399 | break; |
1400 | } |
1401 | } |
1402 | |
1403 | if (Kind == -1) { |
1404 | for (const auto &BaseSpec : RD->bases()) { |
1405 | QualType T = BaseSpec.getType(); |
1406 | if (!T->isStructuralType()) { |
1407 | SubLoc = BaseSpec.getBaseTypeLoc(); |
1408 | SubType = T; |
1409 | Kind = 1; |
1410 | break; |
1411 | } |
1412 | } |
1413 | } |
1414 | |
1415 | assert(Kind != -1 && "couldn't find reason why type is not structural")(static_cast <bool> (Kind != -1 && "couldn't find reason why type is not structural" ) ? void (0) : __assert_fail ("Kind != -1 && \"couldn't find reason why type is not structural\"" , "clang/lib/Sema/SemaTemplate.cpp", 1415, __extension__ __PRETTY_FUNCTION__ )); |
1416 | Diag(SubLoc, diag::note_not_structural_subobject) |
1417 | << T << Kind << SubType; |
1418 | T = SubType; |
1419 | RD = T->getAsCXXRecordDecl(); |
Value stored to 'RD' is never read | |
1420 | } |
1421 | |
1422 | return true; |
1423 | } |
1424 | |
1425 | QualType Sema::CheckNonTypeTemplateParameterType(QualType T, |
1426 | SourceLocation Loc) { |
1427 | // We don't allow variably-modified types as the type of non-type template |
1428 | // parameters. |
1429 | if (T->isVariablyModifiedType()) { |
1430 | Diag(Loc, diag::err_variably_modified_nontype_template_param) |
1431 | << T; |
1432 | return QualType(); |
1433 | } |
1434 | |
1435 | // C++ [temp.param]p4: |
1436 | // |
1437 | // A non-type template-parameter shall have one of the following |
1438 | // (optionally cv-qualified) types: |
1439 | // |
1440 | // -- integral or enumeration type, |
1441 | if (T->isIntegralOrEnumerationType() || |
1442 | // -- pointer to object or pointer to function, |
1443 | T->isPointerType() || |
1444 | // -- lvalue reference to object or lvalue reference to function, |
1445 | T->isLValueReferenceType() || |
1446 | // -- pointer to member, |
1447 | T->isMemberPointerType() || |
1448 | // -- std::nullptr_t, or |
1449 | T->isNullPtrType() || |
1450 | // -- a type that contains a placeholder type. |
1451 | T->isUndeducedType()) { |
1452 | // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter |
1453 | // are ignored when determining its type. |
1454 | return T.getUnqualifiedType(); |
1455 | } |
1456 | |
1457 | // C++ [temp.param]p8: |
1458 | // |
1459 | // A non-type template-parameter of type "array of T" or |
1460 | // "function returning T" is adjusted to be of type "pointer to |
1461 | // T" or "pointer to function returning T", respectively. |
1462 | if (T->isArrayType() || T->isFunctionType()) |
1463 | return Context.getDecayedType(T); |
1464 | |
1465 | // If T is a dependent type, we can't do the check now, so we |
1466 | // assume that it is well-formed. Note that stripping off the |
1467 | // qualifiers here is not really correct if T turns out to be |
1468 | // an array type, but we'll recompute the type everywhere it's |
1469 | // used during instantiation, so that should be OK. (Using the |
1470 | // qualified type is equally wrong.) |
1471 | if (T->isDependentType()) |
1472 | return T.getUnqualifiedType(); |
1473 | |
1474 | // C++20 [temp.param]p6: |
1475 | // -- a structural type |
1476 | if (RequireStructuralType(T, Loc)) |
1477 | return QualType(); |
1478 | |
1479 | if (!getLangOpts().CPlusPlus20) { |
1480 | // FIXME: Consider allowing structural types as an extension in C++17. (In |
1481 | // earlier language modes, the template argument evaluation rules are too |
1482 | // inflexible.) |
1483 | Diag(Loc, diag::err_template_nontype_parm_bad_structural_type) << T; |
1484 | return QualType(); |
1485 | } |
1486 | |
1487 | Diag(Loc, diag::warn_cxx17_compat_template_nontype_parm_type) << T; |
1488 | return T.getUnqualifiedType(); |
1489 | } |
1490 | |
1491 | NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D, |
1492 | unsigned Depth, |
1493 | unsigned Position, |
1494 | SourceLocation EqualLoc, |
1495 | Expr *Default) { |
1496 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
1497 | |
1498 | // Check that we have valid decl-specifiers specified. |
1499 | auto CheckValidDeclSpecifiers = [this, &D] { |
1500 | // C++ [temp.param] |
1501 | // p1 |
1502 | // template-parameter: |
1503 | // ... |
1504 | // parameter-declaration |
1505 | // p2 |
1506 | // ... A storage class shall not be specified in a template-parameter |
1507 | // declaration. |
1508 | // [dcl.typedef]p1: |
1509 | // The typedef specifier [...] shall not be used in the decl-specifier-seq |
1510 | // of a parameter-declaration |
1511 | const DeclSpec &DS = D.getDeclSpec(); |
1512 | auto EmitDiag = [this](SourceLocation Loc) { |
1513 | Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm) |
1514 | << FixItHint::CreateRemoval(Loc); |
1515 | }; |
1516 | if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) |
1517 | EmitDiag(DS.getStorageClassSpecLoc()); |
1518 | |
1519 | if (DS.getThreadStorageClassSpec() != TSCS_unspecified) |
1520 | EmitDiag(DS.getThreadStorageClassSpecLoc()); |
1521 | |
1522 | // [dcl.inline]p1: |
1523 | // The inline specifier can be applied only to the declaration or |
1524 | // definition of a variable or function. |
1525 | |
1526 | if (DS.isInlineSpecified()) |
1527 | EmitDiag(DS.getInlineSpecLoc()); |
1528 | |
1529 | // [dcl.constexpr]p1: |
1530 | // The constexpr specifier shall be applied only to the definition of a |
1531 | // variable or variable template or the declaration of a function or |
1532 | // function template. |
1533 | |
1534 | if (DS.hasConstexprSpecifier()) |
1535 | EmitDiag(DS.getConstexprSpecLoc()); |
1536 | |
1537 | // [dcl.fct.spec]p1: |
1538 | // Function-specifiers can be used only in function declarations. |
1539 | |
1540 | if (DS.isVirtualSpecified()) |
1541 | EmitDiag(DS.getVirtualSpecLoc()); |
1542 | |
1543 | if (DS.hasExplicitSpecifier()) |
1544 | EmitDiag(DS.getExplicitSpecLoc()); |
1545 | |
1546 | if (DS.isNoreturnSpecified()) |
1547 | EmitDiag(DS.getNoreturnSpecLoc()); |
1548 | }; |
1549 | |
1550 | CheckValidDeclSpecifiers(); |
1551 | |
1552 | if (const auto *T = TInfo->getType()->getContainedDeducedType()) |
1553 | if (isa<AutoType>(T)) |
1554 | Diag(D.getIdentifierLoc(), |
1555 | diag::warn_cxx14_compat_template_nontype_parm_auto_type) |
1556 | << QualType(TInfo->getType()->getContainedAutoType(), 0); |
1557 | |
1558 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1559, __extension__ __PRETTY_FUNCTION__ )) |
1559 | "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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1559, __extension__ __PRETTY_FUNCTION__ )); |
1560 | bool Invalid = false; |
1561 | |
1562 | QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc()); |
1563 | if (T.isNull()) { |
1564 | T = Context.IntTy; // Recover with an 'int' type. |
1565 | Invalid = true; |
1566 | } |
1567 | |
1568 | CheckFunctionOrTemplateParamDeclarator(S, D); |
1569 | |
1570 | IdentifierInfo *ParamName = D.getIdentifier(); |
1571 | bool IsParameterPack = D.hasEllipsis(); |
1572 | NonTypeTemplateParmDecl *Param = NonTypeTemplateParmDecl::Create( |
1573 | Context, Context.getTranslationUnitDecl(), D.getBeginLoc(), |
1574 | D.getIdentifierLoc(), Depth, Position, ParamName, T, IsParameterPack, |
1575 | TInfo); |
1576 | Param->setAccess(AS_public); |
1577 | |
1578 | if (AutoTypeLoc TL = TInfo->getTypeLoc().getContainedAutoTypeLoc()) |
1579 | if (TL.isConstrained()) |
1580 | if (AttachTypeConstraint(TL, Param, Param, D.getEllipsisLoc())) |
1581 | Invalid = true; |
1582 | |
1583 | if (Invalid) |
1584 | Param->setInvalidDecl(); |
1585 | |
1586 | if (Param->isParameterPack()) |
1587 | if (auto *LSI = getEnclosingLambda()) |
1588 | LSI->LocalPacks.push_back(Param); |
1589 | |
1590 | if (ParamName) { |
1591 | maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(), |
1592 | ParamName); |
1593 | |
1594 | // Add the template parameter into the current scope. |
1595 | S->AddDecl(Param); |
1596 | IdResolver.AddDecl(Param); |
1597 | } |
1598 | |
1599 | // C++0x [temp.param]p9: |
1600 | // A default template-argument may be specified for any kind of |
1601 | // template-parameter that is not a template parameter pack. |
1602 | if (Default && IsParameterPack) { |
1603 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
1604 | Default = nullptr; |
1605 | } |
1606 | |
1607 | // Check the well-formedness of the default template argument, if provided. |
1608 | if (Default) { |
1609 | // Check for unexpanded parameter packs. |
1610 | if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument)) |
1611 | return Param; |
1612 | |
1613 | Param->setDefaultArgument(Default); |
1614 | } |
1615 | |
1616 | return Param; |
1617 | } |
1618 | |
1619 | /// ActOnTemplateTemplateParameter - Called when a C++ template template |
1620 | /// parameter (e.g. T in template <template \<typename> class T> class array) |
1621 | /// has been parsed. S is the current scope. |
1622 | NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S, |
1623 | SourceLocation TmpLoc, |
1624 | TemplateParameterList *Params, |
1625 | SourceLocation EllipsisLoc, |
1626 | IdentifierInfo *Name, |
1627 | SourceLocation NameLoc, |
1628 | unsigned Depth, |
1629 | unsigned Position, |
1630 | SourceLocation EqualLoc, |
1631 | ParsedTemplateArgument Default) { |
1632 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1633, __extension__ __PRETTY_FUNCTION__ )) |
1633 | "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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1633, __extension__ __PRETTY_FUNCTION__ )); |
1634 | |
1635 | // Construct the parameter object. |
1636 | bool IsParameterPack = EllipsisLoc.isValid(); |
1637 | TemplateTemplateParmDecl *Param = |
1638 | TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
1639 | NameLoc.isInvalid()? TmpLoc : NameLoc, |
1640 | Depth, Position, IsParameterPack, |
1641 | Name, Params); |
1642 | Param->setAccess(AS_public); |
1643 | |
1644 | if (Param->isParameterPack()) |
1645 | if (auto *LSI = getEnclosingLambda()) |
1646 | LSI->LocalPacks.push_back(Param); |
1647 | |
1648 | // If the template template parameter has a name, then link the identifier |
1649 | // into the scope and lookup mechanisms. |
1650 | if (Name) { |
1651 | maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name); |
1652 | |
1653 | S->AddDecl(Param); |
1654 | IdResolver.AddDecl(Param); |
1655 | } |
1656 | |
1657 | if (Params->size() == 0) { |
1658 | Diag(Param->getLocation(), diag::err_template_template_parm_no_parms) |
1659 | << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc()); |
1660 | Param->setInvalidDecl(); |
1661 | } |
1662 | |
1663 | // C++0x [temp.param]p9: |
1664 | // A default template-argument may be specified for any kind of |
1665 | // template-parameter that is not a template parameter pack. |
1666 | if (IsParameterPack && !Default.isInvalid()) { |
1667 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
1668 | Default = ParsedTemplateArgument(); |
1669 | } |
1670 | |
1671 | if (!Default.isInvalid()) { |
1672 | // Check only that we have a template template argument. We don't want to |
1673 | // try to check well-formedness now, because our template template parameter |
1674 | // might have dependent types in its template parameters, which we wouldn't |
1675 | // be able to match now. |
1676 | // |
1677 | // If none of the template template parameter's template arguments mention |
1678 | // other template parameters, we could actually perform more checking here. |
1679 | // However, it isn't worth doing. |
1680 | TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default); |
1681 | if (DefaultArg.getArgument().getAsTemplate().isNull()) { |
1682 | Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template) |
1683 | << DefaultArg.getSourceRange(); |
1684 | return Param; |
1685 | } |
1686 | |
1687 | // Check for unexpanded parameter packs. |
1688 | if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(), |
1689 | DefaultArg.getArgument().getAsTemplate(), |
1690 | UPPC_DefaultArgument)) |
1691 | return Param; |
1692 | |
1693 | Param->setDefaultArgument(Context, DefaultArg); |
1694 | } |
1695 | |
1696 | return Param; |
1697 | } |
1698 | |
1699 | namespace { |
1700 | class ConstraintRefersToContainingTemplateChecker |
1701 | : public TreeTransform<ConstraintRefersToContainingTemplateChecker> { |
1702 | bool Result = false; |
1703 | const FunctionDecl *Friend = nullptr; |
1704 | unsigned TemplateDepth = 0; |
1705 | |
1706 | // Check a record-decl that we've seen to see if it is a lexical parent of the |
1707 | // Friend, likely because it was referred to without its template arguments. |
1708 | void CheckIfContainingRecord(const CXXRecordDecl *CheckingRD) { |
1709 | CheckingRD = CheckingRD->getMostRecentDecl(); |
1710 | |
1711 | for (const DeclContext *DC = Friend->getLexicalDeclContext(); |
1712 | DC && !DC->isFileContext(); DC = DC->getParent()) |
1713 | if (const auto *RD = dyn_cast<CXXRecordDecl>(DC)) |
1714 | if (CheckingRD == RD->getMostRecentDecl()) |
1715 | Result = true; |
1716 | } |
1717 | |
1718 | void CheckNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) { |
1719 | assert(D->getDepth() <= TemplateDepth &&(static_cast <bool> (D->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("D->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1721, __extension__ __PRETTY_FUNCTION__ )) |
1720 | "Nothing should reference a value below the actual template depth, "(static_cast <bool> (D->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("D->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1721, __extension__ __PRETTY_FUNCTION__ )) |
1721 | "depth is likely wrong")(static_cast <bool> (D->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("D->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1721, __extension__ __PRETTY_FUNCTION__ )); |
1722 | if (D->getDepth() != TemplateDepth) |
1723 | Result = true; |
1724 | |
1725 | // Necessary because the type of the NTTP might be what refers to the parent |
1726 | // constriant. |
1727 | TransformType(D->getType()); |
1728 | } |
1729 | |
1730 | public: |
1731 | using inherited = TreeTransform<ConstraintRefersToContainingTemplateChecker>; |
1732 | |
1733 | ConstraintRefersToContainingTemplateChecker(Sema &SemaRef, |
1734 | const FunctionDecl *Friend, |
1735 | unsigned TemplateDepth) |
1736 | : inherited(SemaRef), Friend(Friend), TemplateDepth(TemplateDepth) {} |
1737 | bool getResult() const { return Result; } |
1738 | |
1739 | // This should be the only template parm type that we have to deal with. |
1740 | // SubstTempalteTypeParmPack, SubstNonTypeTemplateParmPack, and |
1741 | // FunctionParmPackExpr are all partially substituted, which cannot happen |
1742 | // with concepts at this point in translation. |
1743 | using inherited::TransformTemplateTypeParmType; |
1744 | QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB, |
1745 | TemplateTypeParmTypeLoc TL, bool) { |
1746 | assert(TL.getDecl()->getDepth() <= TemplateDepth &&(static_cast <bool> (TL.getDecl()->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("TL.getDecl()->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1748, __extension__ __PRETTY_FUNCTION__ )) |
1747 | "Nothing should reference a value below the actual template depth, "(static_cast <bool> (TL.getDecl()->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("TL.getDecl()->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1748, __extension__ __PRETTY_FUNCTION__ )) |
1748 | "depth is likely wrong")(static_cast <bool> (TL.getDecl()->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("TL.getDecl()->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1748, __extension__ __PRETTY_FUNCTION__ )); |
1749 | if (TL.getDecl()->getDepth() != TemplateDepth) |
1750 | Result = true; |
1751 | return inherited::TransformTemplateTypeParmType( |
1752 | TLB, TL, |
1753 | /*SuppressObjCLifetime=*/false); |
1754 | } |
1755 | |
1756 | Decl *TransformDecl(SourceLocation Loc, Decl *D) { |
1757 | if (!D) |
1758 | return D; |
1759 | // FIXME : This is possibly an incomplete list, but it is unclear what other |
1760 | // Decl kinds could be used to refer to the template parameters. This is a |
1761 | // best guess so far based on examples currently available, but the |
1762 | // unreachable should catch future instances/cases. |
1763 | if (auto *TD = dyn_cast<TypedefNameDecl>(D)) |
1764 | TransformType(TD->getUnderlyingType()); |
1765 | else if (auto *NTTPD = dyn_cast<NonTypeTemplateParmDecl>(D)) |
1766 | CheckNonTypeTemplateParmDecl(NTTPD); |
1767 | else if (auto *VD = dyn_cast<ValueDecl>(D)) |
1768 | TransformType(VD->getType()); |
1769 | else if (auto *TD = dyn_cast<TemplateDecl>(D)) |
1770 | TransformTemplateParameterList(TD->getTemplateParameters()); |
1771 | else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) |
1772 | CheckIfContainingRecord(RD); |
1773 | else if (isa<NamedDecl>(D)) { |
1774 | // No direct types to visit here I believe. |
1775 | } else |
1776 | llvm_unreachable("Don't know how to handle this declaration type yet")::llvm::llvm_unreachable_internal("Don't know how to handle this declaration type yet" , "clang/lib/Sema/SemaTemplate.cpp", 1776); |
1777 | return D; |
1778 | } |
1779 | }; |
1780 | } // namespace |
1781 | |
1782 | bool Sema::ConstraintExpressionDependsOnEnclosingTemplate( |
1783 | const FunctionDecl *Friend, unsigned TemplateDepth, |
1784 | const Expr *Constraint) { |
1785 | assert(Friend->getFriendObjectKind() && "Only works on a friend")(static_cast <bool> (Friend->getFriendObjectKind() && "Only works on a friend") ? void (0) : __assert_fail ("Friend->getFriendObjectKind() && \"Only works on a friend\"" , "clang/lib/Sema/SemaTemplate.cpp", 1785, __extension__ __PRETTY_FUNCTION__ )); |
1786 | ConstraintRefersToContainingTemplateChecker Checker(*this, Friend, |
1787 | TemplateDepth); |
1788 | Checker.TransformExpr(const_cast<Expr *>(Constraint)); |
1789 | return Checker.getResult(); |
1790 | } |
1791 | |
1792 | /// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally |
1793 | /// constrained by RequiresClause, that contains the template parameters in |
1794 | /// Params. |
1795 | TemplateParameterList * |
1796 | Sema::ActOnTemplateParameterList(unsigned Depth, |
1797 | SourceLocation ExportLoc, |
1798 | SourceLocation TemplateLoc, |
1799 | SourceLocation LAngleLoc, |
1800 | ArrayRef<NamedDecl *> Params, |
1801 | SourceLocation RAngleLoc, |
1802 | Expr *RequiresClause) { |
1803 | if (ExportLoc.isValid()) |
1804 | Diag(ExportLoc, diag::warn_template_export_unsupported); |
1805 | |
1806 | for (NamedDecl *P : Params) |
1807 | warnOnReservedIdentifier(P); |
1808 | |
1809 | return TemplateParameterList::Create( |
1810 | Context, TemplateLoc, LAngleLoc, |
1811 | llvm::ArrayRef(Params.data(), Params.size()), RAngleLoc, RequiresClause); |
1812 | } |
1813 | |
1814 | static void SetNestedNameSpecifier(Sema &S, TagDecl *T, |
1815 | const CXXScopeSpec &SS) { |
1816 | if (SS.isSet()) |
1817 | T->setQualifierInfo(SS.getWithLocInContext(S.Context)); |
1818 | } |
1819 | |
1820 | DeclResult Sema::CheckClassTemplate( |
1821 | Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc, |
1822 | CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc, |
1823 | const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams, |
1824 | AccessSpecifier AS, SourceLocation ModulePrivateLoc, |
1825 | SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists, |
1826 | TemplateParameterList **OuterTemplateParamLists, SkipBodyInfo *SkipBody) { |
1827 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 1828, __extension__ __PRETTY_FUNCTION__ )) |
1828 | "No template parameters")(static_cast <bool> (TemplateParams && TemplateParams ->size() > 0 && "No template parameters") ? void (0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\"" , "clang/lib/Sema/SemaTemplate.cpp", 1828, __extension__ __PRETTY_FUNCTION__ )); |
1829 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 1829, __extension__ __PRETTY_FUNCTION__ )); |
1830 | bool Invalid = false; |
1831 | |
1832 | // Check that we can declare a template here. |
1833 | if (CheckTemplateDeclScope(S, TemplateParams)) |
1834 | return true; |
1835 | |
1836 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
1837 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 1837, __extension__ __PRETTY_FUNCTION__ )); |
1838 | |
1839 | // There is no such thing as an unnamed class template. |
1840 | if (!Name) { |
1841 | Diag(KWLoc, diag::err_template_unnamed_class); |
1842 | return true; |
1843 | } |
1844 | |
1845 | // Find any previous declaration with this name. For a friend with no |
1846 | // scope explicitly specified, we only look for tag declarations (per |
1847 | // C++11 [basic.lookup.elab]p2). |
1848 | DeclContext *SemanticContext; |
1849 | LookupResult Previous(*this, Name, NameLoc, |
1850 | (SS.isEmpty() && TUK == TUK_Friend) |
1851 | ? LookupTagName : LookupOrdinaryName, |
1852 | forRedeclarationInCurContext()); |
1853 | if (SS.isNotEmpty() && !SS.isInvalid()) { |
1854 | SemanticContext = computeDeclContext(SS, true); |
1855 | if (!SemanticContext) { |
1856 | // FIXME: Horrible, horrible hack! We can't currently represent this |
1857 | // in the AST, and historically we have just ignored such friend |
1858 | // class templates, so don't complain here. |
1859 | Diag(NameLoc, TUK == TUK_Friend |
1860 | ? diag::warn_template_qualified_friend_ignored |
1861 | : diag::err_template_qualified_declarator_no_match) |
1862 | << SS.getScopeRep() << SS.getRange(); |
1863 | return TUK != TUK_Friend; |
1864 | } |
1865 | |
1866 | if (RequireCompleteDeclContext(SS, SemanticContext)) |
1867 | return true; |
1868 | |
1869 | // If we're adding a template to a dependent context, we may need to |
1870 | // rebuilding some of the types used within the template parameter list, |
1871 | // now that we know what the current instantiation is. |
1872 | if (SemanticContext->isDependentContext()) { |
1873 | ContextRAII SavedContext(*this, SemanticContext); |
1874 | if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) |
1875 | Invalid = true; |
1876 | } else if (TUK != TUK_Friend && TUK != TUK_Reference) |
1877 | diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc, false); |
1878 | |
1879 | LookupQualifiedName(Previous, SemanticContext); |
1880 | } else { |
1881 | SemanticContext = CurContext; |
1882 | |
1883 | // C++14 [class.mem]p14: |
1884 | // If T is the name of a class, then each of the following shall have a |
1885 | // name different from T: |
1886 | // -- every member template of class T |
1887 | if (TUK != TUK_Friend && |
1888 | DiagnoseClassNameShadow(SemanticContext, |
1889 | DeclarationNameInfo(Name, NameLoc))) |
1890 | return true; |
1891 | |
1892 | LookupName(Previous, S); |
1893 | } |
1894 | |
1895 | if (Previous.isAmbiguous()) |
1896 | return true; |
1897 | |
1898 | NamedDecl *PrevDecl = nullptr; |
1899 | if (Previous.begin() != Previous.end()) |
1900 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); |
1901 | |
1902 | if (PrevDecl && PrevDecl->isTemplateParameter()) { |
1903 | // Maybe we will complain about the shadowed template parameter. |
1904 | DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); |
1905 | // Just pretend that we didn't see the previous declaration. |
1906 | PrevDecl = nullptr; |
1907 | } |
1908 | |
1909 | // If there is a previous declaration with the same name, check |
1910 | // whether this is a valid redeclaration. |
1911 | ClassTemplateDecl *PrevClassTemplate = |
1912 | dyn_cast_or_null<ClassTemplateDecl>(PrevDecl); |
1913 | |
1914 | // We may have found the injected-class-name of a class template, |
1915 | // class template partial specialization, or class template specialization. |
1916 | // In these cases, grab the template that is being defined or specialized. |
1917 | if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) && |
1918 | cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) { |
1919 | PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext()); |
1920 | PrevClassTemplate |
1921 | = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate(); |
1922 | if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) { |
1923 | PrevClassTemplate |
1924 | = cast<ClassTemplateSpecializationDecl>(PrevDecl) |
1925 | ->getSpecializedTemplate(); |
1926 | } |
1927 | } |
1928 | |
1929 | if (TUK == TUK_Friend) { |
1930 | // C++ [namespace.memdef]p3: |
1931 | // [...] When looking for a prior declaration of a class or a function |
1932 | // declared as a friend, and when the name of the friend class or |
1933 | // function is neither a qualified name nor a template-id, scopes outside |
1934 | // the innermost enclosing namespace scope are not considered. |
1935 | if (!SS.isSet()) { |
1936 | DeclContext *OutermostContext = CurContext; |
1937 | while (!OutermostContext->isFileContext()) |
1938 | OutermostContext = OutermostContext->getLookupParent(); |
1939 | |
1940 | if (PrevDecl && |
1941 | (OutermostContext->Equals(PrevDecl->getDeclContext()) || |
1942 | OutermostContext->Encloses(PrevDecl->getDeclContext()))) { |
1943 | SemanticContext = PrevDecl->getDeclContext(); |
1944 | } else { |
1945 | // Declarations in outer scopes don't matter. However, the outermost |
1946 | // context we computed is the semantic context for our new |
1947 | // declaration. |
1948 | PrevDecl = PrevClassTemplate = nullptr; |
1949 | SemanticContext = OutermostContext; |
1950 | |
1951 | // Check that the chosen semantic context doesn't already contain a |
1952 | // declaration of this name as a non-tag type. |
1953 | Previous.clear(LookupOrdinaryName); |
1954 | DeclContext *LookupContext = SemanticContext; |
1955 | while (LookupContext->isTransparentContext()) |
1956 | LookupContext = LookupContext->getLookupParent(); |
1957 | LookupQualifiedName(Previous, LookupContext); |
1958 | |
1959 | if (Previous.isAmbiguous()) |
1960 | return true; |
1961 | |
1962 | if (Previous.begin() != Previous.end()) |
1963 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); |
1964 | } |
1965 | } |
1966 | } else if (PrevDecl && |
1967 | !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext, |
1968 | S, SS.isValid())) |
1969 | PrevDecl = PrevClassTemplate = nullptr; |
1970 | |
1971 | if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>( |
1972 | PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) { |
1973 | if (SS.isEmpty() && |
1974 | !(PrevClassTemplate && |
1975 | PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals( |
1976 | SemanticContext->getRedeclContext()))) { |
1977 | Diag(KWLoc, diag::err_using_decl_conflict_reverse); |
1978 | Diag(Shadow->getTargetDecl()->getLocation(), |
1979 | diag::note_using_decl_target); |
1980 | Diag(Shadow->getIntroducer()->getLocation(), diag::note_using_decl) << 0; |
1981 | // Recover by ignoring the old declaration. |
1982 | PrevDecl = PrevClassTemplate = nullptr; |
1983 | } |
1984 | } |
1985 | |
1986 | if (PrevClassTemplate) { |
1987 | // Ensure that the template parameter lists are compatible. Skip this check |
1988 | // for a friend in a dependent context: the template parameter list itself |
1989 | // could be dependent. |
1990 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && |
1991 | !TemplateParameterListsAreEqual(TemplateParams, |
1992 | PrevClassTemplate->getTemplateParameters(), |
1993 | /*Complain=*/true, |
1994 | TPL_TemplateMatch)) |
1995 | return true; |
1996 | |
1997 | // C++ [temp.class]p4: |
1998 | // In a redeclaration, partial specialization, explicit |
1999 | // specialization or explicit instantiation of a class template, |
2000 | // the class-key shall agree in kind with the original class |
2001 | // template declaration (7.1.5.3). |
2002 | RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl(); |
2003 | if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind, |
2004 | TUK == TUK_Definition, KWLoc, Name)) { |
2005 | Diag(KWLoc, diag::err_use_with_wrong_tag) |
2006 | << Name |
2007 | << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName()); |
2008 | Diag(PrevRecordDecl->getLocation(), diag::note_previous_use); |
2009 | Kind = PrevRecordDecl->getTagKind(); |
2010 | } |
2011 | |
2012 | // Check for redefinition of this class template. |
2013 | if (TUK == TUK_Definition) { |
2014 | if (TagDecl *Def = PrevRecordDecl->getDefinition()) { |
2015 | // If we have a prior definition that is not visible, treat this as |
2016 | // simply making that previous definition visible. |
2017 | NamedDecl *Hidden = nullptr; |
2018 | if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) { |
2019 | SkipBody->ShouldSkip = true; |
2020 | SkipBody->Previous = Def; |
2021 | auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate(); |
2022 | 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?\"" , "clang/lib/Sema/SemaTemplate.cpp", 2023, __extension__ __PRETTY_FUNCTION__ )) |
2023 | "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?\"" , "clang/lib/Sema/SemaTemplate.cpp", 2023, __extension__ __PRETTY_FUNCTION__ )); |
2024 | makeMergedDefinitionVisible(Hidden); |
2025 | makeMergedDefinitionVisible(Tmpl); |
2026 | } else { |
2027 | Diag(NameLoc, diag::err_redefinition) << Name; |
2028 | Diag(Def->getLocation(), diag::note_previous_definition); |
2029 | // FIXME: Would it make sense to try to "forget" the previous |
2030 | // definition, as part of error recovery? |
2031 | return true; |
2032 | } |
2033 | } |
2034 | } |
2035 | } else if (PrevDecl) { |
2036 | // C++ [temp]p5: |
2037 | // A class template shall not have the same name as any other |
2038 | // template, class, function, object, enumeration, enumerator, |
2039 | // namespace, or type in the same scope (3.3), except as specified |
2040 | // in (14.5.4). |
2041 | Diag(NameLoc, diag::err_redefinition_different_kind) << Name; |
2042 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
2043 | return true; |
2044 | } |
2045 | |
2046 | // Check the template parameter list of this declaration, possibly |
2047 | // merging in the template parameter list from the previous class |
2048 | // template declaration. Skip this check for a friend in a dependent |
2049 | // context, because the template parameter list might be dependent. |
2050 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && |
2051 | CheckTemplateParameterList( |
2052 | TemplateParams, |
2053 | PrevClassTemplate |
2054 | ? PrevClassTemplate->getMostRecentDecl()->getTemplateParameters() |
2055 | : nullptr, |
2056 | (SS.isSet() && SemanticContext && SemanticContext->isRecord() && |
2057 | SemanticContext->isDependentContext()) |
2058 | ? TPC_ClassTemplateMember |
2059 | : TUK == TUK_Friend ? TPC_FriendClassTemplate : TPC_ClassTemplate, |
2060 | SkipBody)) |
2061 | Invalid = true; |
2062 | |
2063 | if (SS.isSet()) { |
2064 | // If the name of the template was qualified, we must be defining the |
2065 | // template out-of-line. |
2066 | if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) { |
2067 | Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match |
2068 | : diag::err_member_decl_does_not_match) |
2069 | << Name << SemanticContext << /*IsDefinition*/true << SS.getRange(); |
2070 | Invalid = true; |
2071 | } |
2072 | } |
2073 | |
2074 | // If this is a templated friend in a dependent context we should not put it |
2075 | // on the redecl chain. In some cases, the templated friend can be the most |
2076 | // recent declaration tricking the template instantiator to make substitutions |
2077 | // there. |
2078 | // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious |
2079 | bool ShouldAddRedecl |
2080 | = !(TUK == TUK_Friend && CurContext->isDependentContext()); |
2081 | |
2082 | CXXRecordDecl *NewClass = |
2083 | CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name, |
2084 | PrevClassTemplate && ShouldAddRedecl ? |
2085 | PrevClassTemplate->getTemplatedDecl() : nullptr, |
2086 | /*DelayTypeCreation=*/true); |
2087 | SetNestedNameSpecifier(*this, NewClass, SS); |
2088 | if (NumOuterTemplateParamLists > 0) |
2089 | NewClass->setTemplateParameterListsInfo( |
2090 | Context, |
2091 | llvm::ArrayRef(OuterTemplateParamLists, NumOuterTemplateParamLists)); |
2092 | |
2093 | // Add alignment attributes if necessary; these attributes are checked when |
2094 | // the ASTContext lays out the structure. |
2095 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { |
2096 | AddAlignmentAttributesForRecord(NewClass); |
2097 | AddMsStructLayoutForRecord(NewClass); |
2098 | } |
2099 | |
2100 | ClassTemplateDecl *NewTemplate |
2101 | = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc, |
2102 | DeclarationName(Name), TemplateParams, |
2103 | NewClass); |
2104 | |
2105 | if (ShouldAddRedecl) |
2106 | NewTemplate->setPreviousDecl(PrevClassTemplate); |
2107 | |
2108 | NewClass->setDescribedClassTemplate(NewTemplate); |
2109 | |
2110 | if (ModulePrivateLoc.isValid()) |
2111 | NewTemplate->setModulePrivate(); |
2112 | |
2113 | // Build the type for the class template declaration now. |
2114 | QualType T = NewTemplate->getInjectedClassNameSpecialization(); |
2115 | T = Context.getInjectedClassNameType(NewClass, T); |
2116 | 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?\"" , "clang/lib/Sema/SemaTemplate.cpp", 2116, __extension__ __PRETTY_FUNCTION__ )); |
2117 | (void)T; |
2118 | |
2119 | // If we are providing an explicit specialization of a member that is a |
2120 | // class template, make a note of that. |
2121 | if (PrevClassTemplate && |
2122 | PrevClassTemplate->getInstantiatedFromMemberTemplate()) |
2123 | PrevClassTemplate->setMemberSpecialization(); |
2124 | |
2125 | // Set the access specifier. |
2126 | if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord()) |
2127 | SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS); |
2128 | |
2129 | // Set the lexical context of these templates |
2130 | NewClass->setLexicalDeclContext(CurContext); |
2131 | NewTemplate->setLexicalDeclContext(CurContext); |
2132 | |
2133 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) |
2134 | NewClass->startDefinition(); |
2135 | |
2136 | ProcessDeclAttributeList(S, NewClass, Attr); |
2137 | |
2138 | if (PrevClassTemplate) |
2139 | mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl()); |
2140 | |
2141 | AddPushedVisibilityAttribute(NewClass); |
2142 | inferGslOwnerPointerAttribute(NewClass); |
2143 | |
2144 | if (TUK != TUK_Friend) { |
2145 | // Per C++ [basic.scope.temp]p2, skip the template parameter scopes. |
2146 | Scope *Outer = S; |
2147 | while ((Outer->getFlags() & Scope::TemplateParamScope) != 0) |
2148 | Outer = Outer->getParent(); |
2149 | PushOnScopeChains(NewTemplate, Outer); |
2150 | } else { |
2151 | if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) { |
2152 | NewTemplate->setAccess(PrevClassTemplate->getAccess()); |
2153 | NewClass->setAccess(PrevClassTemplate->getAccess()); |
2154 | } |
2155 | |
2156 | NewTemplate->setObjectOfFriendDecl(); |
2157 | |
2158 | // Friend templates are visible in fairly strange ways. |
2159 | if (!CurContext->isDependentContext()) { |
2160 | DeclContext *DC = SemanticContext->getRedeclContext(); |
2161 | DC->makeDeclVisibleInContext(NewTemplate); |
2162 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) |
2163 | PushOnScopeChains(NewTemplate, EnclosingScope, |
2164 | /* AddToContext = */ false); |
2165 | } |
2166 | |
2167 | FriendDecl *Friend = FriendDecl::Create( |
2168 | Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc); |
2169 | Friend->setAccess(AS_public); |
2170 | CurContext->addDecl(Friend); |
2171 | } |
2172 | |
2173 | if (PrevClassTemplate) |
2174 | CheckRedeclarationInModule(NewTemplate, PrevClassTemplate); |
2175 | |
2176 | if (Invalid) { |
2177 | NewTemplate->setInvalidDecl(); |
2178 | NewClass->setInvalidDecl(); |
2179 | } |
2180 | |
2181 | ActOnDocumentableDecl(NewTemplate); |
2182 | |
2183 | if (SkipBody && SkipBody->ShouldSkip) |
2184 | return SkipBody->Previous; |
2185 | |
2186 | return NewTemplate; |
2187 | } |
2188 | |
2189 | namespace { |
2190 | /// Tree transform to "extract" a transformed type from a class template's |
2191 | /// constructor to a deduction guide. |
2192 | class ExtractTypeForDeductionGuide |
2193 | : public TreeTransform<ExtractTypeForDeductionGuide> { |
2194 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs; |
2195 | |
2196 | public: |
2197 | typedef TreeTransform<ExtractTypeForDeductionGuide> Base; |
2198 | ExtractTypeForDeductionGuide( |
2199 | Sema &SemaRef, |
2200 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) |
2201 | : Base(SemaRef), MaterializedTypedefs(MaterializedTypedefs) {} |
2202 | |
2203 | TypeSourceInfo *transform(TypeSourceInfo *TSI) { return TransformType(TSI); } |
2204 | |
2205 | QualType TransformTypedefType(TypeLocBuilder &TLB, TypedefTypeLoc TL) { |
2206 | ASTContext &Context = SemaRef.getASTContext(); |
2207 | TypedefNameDecl *OrigDecl = TL.getTypedefNameDecl(); |
2208 | TypedefNameDecl *Decl = OrigDecl; |
2209 | // Transform the underlying type of the typedef and clone the Decl only if |
2210 | // the typedef has a dependent context. |
2211 | if (OrigDecl->getDeclContext()->isDependentContext()) { |
2212 | TypeLocBuilder InnerTLB; |
2213 | QualType Transformed = |
2214 | TransformType(InnerTLB, OrigDecl->getTypeSourceInfo()->getTypeLoc()); |
2215 | TypeSourceInfo *TSI = InnerTLB.getTypeSourceInfo(Context, Transformed); |
2216 | if (isa<TypeAliasDecl>(OrigDecl)) |
2217 | Decl = TypeAliasDecl::Create( |
2218 | Context, Context.getTranslationUnitDecl(), OrigDecl->getBeginLoc(), |
2219 | OrigDecl->getLocation(), OrigDecl->getIdentifier(), TSI); |
2220 | else { |
2221 | assert(isa<TypedefDecl>(OrigDecl) && "Not a Type alias or typedef")(static_cast <bool> (isa<TypedefDecl>(OrigDecl) && "Not a Type alias or typedef") ? void (0) : __assert_fail ("isa<TypedefDecl>(OrigDecl) && \"Not a Type alias or typedef\"" , "clang/lib/Sema/SemaTemplate.cpp", 2221, __extension__ __PRETTY_FUNCTION__ )); |
2222 | Decl = TypedefDecl::Create( |
2223 | Context, Context.getTranslationUnitDecl(), OrigDecl->getBeginLoc(), |
2224 | OrigDecl->getLocation(), OrigDecl->getIdentifier(), TSI); |
2225 | } |
2226 | MaterializedTypedefs.push_back(Decl); |
2227 | } |
2228 | |
2229 | QualType TDTy = Context.getTypedefType(Decl); |
2230 | TypedefTypeLoc TypedefTL = TLB.push<TypedefTypeLoc>(TDTy); |
2231 | TypedefTL.setNameLoc(TL.getNameLoc()); |
2232 | |
2233 | return TDTy; |
2234 | } |
2235 | }; |
2236 | |
2237 | /// Transform to convert portions of a constructor declaration into the |
2238 | /// corresponding deduction guide, per C++1z [over.match.class.deduct]p1. |
2239 | struct ConvertConstructorToDeductionGuideTransform { |
2240 | ConvertConstructorToDeductionGuideTransform(Sema &S, |
2241 | ClassTemplateDecl *Template) |
2242 | : SemaRef(S), Template(Template) {} |
2243 | |
2244 | Sema &SemaRef; |
2245 | ClassTemplateDecl *Template; |
2246 | |
2247 | DeclContext *DC = Template->getDeclContext(); |
2248 | CXXRecordDecl *Primary = Template->getTemplatedDecl(); |
2249 | DeclarationName DeductionGuideName = |
2250 | SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template); |
2251 | |
2252 | QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary); |
2253 | |
2254 | // Index adjustment to apply to convert depth-1 template parameters into |
2255 | // depth-0 template parameters. |
2256 | unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size(); |
2257 | |
2258 | /// Transform a constructor declaration into a deduction guide. |
2259 | NamedDecl *transformConstructor(FunctionTemplateDecl *FTD, |
2260 | CXXConstructorDecl *CD) { |
2261 | SmallVector<TemplateArgument, 16> SubstArgs; |
2262 | |
2263 | LocalInstantiationScope Scope(SemaRef); |
2264 | |
2265 | // C++ [over.match.class.deduct]p1: |
2266 | // -- For each constructor of the class template designated by the |
2267 | // template-name, a function template with the following properties: |
2268 | |
2269 | // -- The template parameters are the template parameters of the class |
2270 | // template followed by the template parameters (including default |
2271 | // template arguments) of the constructor, if any. |
2272 | TemplateParameterList *TemplateParams = Template->getTemplateParameters(); |
2273 | if (FTD) { |
2274 | TemplateParameterList *InnerParams = FTD->getTemplateParameters(); |
2275 | SmallVector<NamedDecl *, 16> AllParams; |
2276 | AllParams.reserve(TemplateParams->size() + InnerParams->size()); |
2277 | AllParams.insert(AllParams.begin(), |
2278 | TemplateParams->begin(), TemplateParams->end()); |
2279 | SubstArgs.reserve(InnerParams->size()); |
2280 | |
2281 | // Later template parameters could refer to earlier ones, so build up |
2282 | // a list of substituted template arguments as we go. |
2283 | for (NamedDecl *Param : *InnerParams) { |
2284 | MultiLevelTemplateArgumentList Args; |
2285 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
2286 | Args.addOuterTemplateArguments(SubstArgs); |
2287 | Args.addOuterRetainedLevel(); |
2288 | NamedDecl *NewParam = transformTemplateParameter(Param, Args); |
2289 | if (!NewParam) |
2290 | return nullptr; |
2291 | AllParams.push_back(NewParam); |
2292 | SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument( |
2293 | SemaRef.Context.getInjectedTemplateArg(NewParam))); |
2294 | } |
2295 | |
2296 | // Substitute new template parameters into requires-clause if present. |
2297 | Expr *RequiresClause = nullptr; |
2298 | if (Expr *InnerRC = InnerParams->getRequiresClause()) { |
2299 | MultiLevelTemplateArgumentList Args; |
2300 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
2301 | Args.addOuterTemplateArguments(SubstArgs); |
2302 | Args.addOuterRetainedLevel(); |
2303 | ExprResult E = SemaRef.SubstExpr(InnerRC, Args); |
2304 | if (E.isInvalid()) |
2305 | return nullptr; |
2306 | RequiresClause = E.getAs<Expr>(); |
2307 | } |
2308 | |
2309 | TemplateParams = TemplateParameterList::Create( |
2310 | SemaRef.Context, InnerParams->getTemplateLoc(), |
2311 | InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(), |
2312 | RequiresClause); |
2313 | } |
2314 | |
2315 | // If we built a new template-parameter-list, track that we need to |
2316 | // substitute references to the old parameters into references to the |
2317 | // new ones. |
2318 | MultiLevelTemplateArgumentList Args; |
2319 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
2320 | if (FTD) { |
2321 | Args.addOuterTemplateArguments(SubstArgs); |
2322 | Args.addOuterRetainedLevel(); |
2323 | } |
2324 | |
2325 | FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc() |
2326 | .getAsAdjusted<FunctionProtoTypeLoc>(); |
2327 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 2327, __extension__ __PRETTY_FUNCTION__ )); |
2328 | |
2329 | // Transform the type of the function, adjusting the return type and |
2330 | // replacing references to the old parameters with references to the |
2331 | // new ones. |
2332 | TypeLocBuilder TLB; |
2333 | SmallVector<ParmVarDecl*, 8> Params; |
2334 | SmallVector<TypedefNameDecl *, 4> MaterializedTypedefs; |
2335 | QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args, |
2336 | MaterializedTypedefs); |
2337 | if (NewType.isNull()) |
2338 | return nullptr; |
2339 | TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType); |
2340 | |
2341 | return buildDeductionGuide(TemplateParams, CD, CD->getExplicitSpecifier(), |
2342 | NewTInfo, CD->getBeginLoc(), CD->getLocation(), |
2343 | CD->getEndLoc(), MaterializedTypedefs); |
2344 | } |
2345 | |
2346 | /// Build a deduction guide with the specified parameter types. |
2347 | NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) { |
2348 | SourceLocation Loc = Template->getLocation(); |
2349 | |
2350 | // Build the requested type. |
2351 | FunctionProtoType::ExtProtoInfo EPI; |
2352 | EPI.HasTrailingReturn = true; |
2353 | QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc, |
2354 | DeductionGuideName, EPI); |
2355 | TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc); |
2356 | |
2357 | FunctionProtoTypeLoc FPTL = |
2358 | TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>(); |
2359 | |
2360 | // Build the parameters, needed during deduction / substitution. |
2361 | SmallVector<ParmVarDecl*, 4> Params; |
2362 | for (auto T : ParamTypes) { |
2363 | ParmVarDecl *NewParam = ParmVarDecl::Create( |
2364 | SemaRef.Context, DC, Loc, Loc, nullptr, T, |
2365 | SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr); |
2366 | NewParam->setScopeInfo(0, Params.size()); |
2367 | FPTL.setParam(Params.size(), NewParam); |
2368 | Params.push_back(NewParam); |
2369 | } |
2370 | |
2371 | return buildDeductionGuide(Template->getTemplateParameters(), nullptr, |
2372 | ExplicitSpecifier(), TSI, Loc, Loc, Loc); |
2373 | } |
2374 | |
2375 | private: |
2376 | /// Transform a constructor template parameter into a deduction guide template |
2377 | /// parameter, rebuilding any internal references to earlier parameters and |
2378 | /// renumbering as we go. |
2379 | NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam, |
2380 | MultiLevelTemplateArgumentList &Args) { |
2381 | if (auto *TTP = dyn_cast<TemplateTypeParmDecl>(TemplateParam)) { |
2382 | // TemplateTypeParmDecl's index cannot be changed after creation, so |
2383 | // substitute it directly. |
2384 | auto *NewTTP = TemplateTypeParmDecl::Create( |
2385 | SemaRef.Context, DC, TTP->getBeginLoc(), TTP->getLocation(), |
2386 | /*Depth*/ 0, Depth1IndexAdjustment + TTP->getIndex(), |
2387 | TTP->getIdentifier(), TTP->wasDeclaredWithTypename(), |
2388 | TTP->isParameterPack(), TTP->hasTypeConstraint(), |
2389 | TTP->isExpandedParameterPack() |
2390 | ? std::optional<unsigned>(TTP->getNumExpansionParameters()) |
2391 | : std::nullopt); |
2392 | if (const auto *TC = TTP->getTypeConstraint()) |
2393 | SemaRef.SubstTypeConstraint(NewTTP, TC, Args, |
2394 | /*EvaluateConstraint*/ true); |
2395 | if (TTP->hasDefaultArgument()) { |
2396 | TypeSourceInfo *InstantiatedDefaultArg = |
2397 | SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args, |
2398 | TTP->getDefaultArgumentLoc(), TTP->getDeclName()); |
2399 | if (InstantiatedDefaultArg) |
2400 | NewTTP->setDefaultArgument(InstantiatedDefaultArg); |
2401 | } |
2402 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam, |
2403 | NewTTP); |
2404 | return NewTTP; |
2405 | } |
2406 | |
2407 | if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TemplateParam)) |
2408 | return transformTemplateParameterImpl(TTP, Args); |
2409 | |
2410 | return transformTemplateParameterImpl( |
2411 | cast<NonTypeTemplateParmDecl>(TemplateParam), Args); |
2412 | } |
2413 | template<typename TemplateParmDecl> |
2414 | TemplateParmDecl * |
2415 | transformTemplateParameterImpl(TemplateParmDecl *OldParam, |
2416 | MultiLevelTemplateArgumentList &Args) { |
2417 | // Ask the template instantiator to do the heavy lifting for us, then adjust |
2418 | // the index of the parameter once it's done. |
2419 | auto *NewParam = |
2420 | cast<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args)); |
2421 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 2421, __extension__ __PRETTY_FUNCTION__ )); |
2422 | NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment); |
2423 | return NewParam; |
2424 | } |
2425 | |
2426 | QualType transformFunctionProtoType( |
2427 | TypeLocBuilder &TLB, FunctionProtoTypeLoc TL, |
2428 | SmallVectorImpl<ParmVarDecl *> &Params, |
2429 | MultiLevelTemplateArgumentList &Args, |
2430 | SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) { |
2431 | SmallVector<QualType, 4> ParamTypes; |
2432 | const FunctionProtoType *T = TL.getTypePtr(); |
2433 | |
2434 | // -- The types of the function parameters are those of the constructor. |
2435 | for (auto *OldParam : TL.getParams()) { |
2436 | ParmVarDecl *NewParam = |
2437 | transformFunctionTypeParam(OldParam, Args, MaterializedTypedefs); |
2438 | if (!NewParam) |
2439 | return QualType(); |
2440 | ParamTypes.push_back(NewParam->getType()); |
2441 | Params.push_back(NewParam); |
2442 | } |
2443 | |
2444 | // -- The return type is the class template specialization designated by |
2445 | // the template-name and template arguments corresponding to the |
2446 | // template parameters obtained from the class template. |
2447 | // |
2448 | // We use the injected-class-name type of the primary template instead. |
2449 | // This has the convenient property that it is different from any type that |
2450 | // the user can write in a deduction-guide (because they cannot enter the |
2451 | // context of the template), so implicit deduction guides can never collide |
2452 | // with explicit ones. |
2453 | QualType ReturnType = DeducedType; |
2454 | TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation()); |
2455 | |
2456 | // Resolving a wording defect, we also inherit the variadicness of the |
2457 | // constructor. |
2458 | FunctionProtoType::ExtProtoInfo EPI; |
2459 | EPI.Variadic = T->isVariadic(); |
2460 | EPI.HasTrailingReturn = true; |
2461 | |
2462 | QualType Result = SemaRef.BuildFunctionType( |
2463 | ReturnType, ParamTypes, TL.getBeginLoc(), DeductionGuideName, EPI); |
2464 | if (Result.isNull()) |
2465 | return QualType(); |
2466 | |
2467 | FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result); |
2468 | NewTL.setLocalRangeBegin(TL.getLocalRangeBegin()); |
2469 | NewTL.setLParenLoc(TL.getLParenLoc()); |
2470 | NewTL.setRParenLoc(TL.getRParenLoc()); |
2471 | NewTL.setExceptionSpecRange(SourceRange()); |
2472 | NewTL.setLocalRangeEnd(TL.getLocalRangeEnd()); |
2473 | for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I) |
2474 | NewTL.setParam(I, Params[I]); |
2475 | |
2476 | return Result; |
2477 | } |
2478 | |
2479 | ParmVarDecl *transformFunctionTypeParam( |
2480 | ParmVarDecl *OldParam, MultiLevelTemplateArgumentList &Args, |
2481 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) { |
2482 | TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo(); |
2483 | TypeSourceInfo *NewDI; |
2484 | if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) { |
2485 | // Expand out the one and only element in each inner pack. |
2486 | Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0); |
2487 | NewDI = |
2488 | SemaRef.SubstType(PackTL.getPatternLoc(), Args, |
2489 | OldParam->getLocation(), OldParam->getDeclName()); |
2490 | if (!NewDI) return nullptr; |
2491 | NewDI = |
2492 | SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(), |
2493 | PackTL.getTypePtr()->getNumExpansions()); |
2494 | } else |
2495 | NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(), |
2496 | OldParam->getDeclName()); |
2497 | if (!NewDI) |
2498 | return nullptr; |
2499 | |
2500 | // Extract the type. This (for instance) replaces references to typedef |
2501 | // members of the current instantiations with the definitions of those |
2502 | // typedefs, avoiding triggering instantiation of the deduced type during |
2503 | // deduction. |
2504 | NewDI = ExtractTypeForDeductionGuide(SemaRef, MaterializedTypedefs) |
2505 | .transform(NewDI); |
2506 | |
2507 | // Resolving a wording defect, we also inherit default arguments from the |
2508 | // constructor. |
2509 | ExprResult NewDefArg; |
2510 | if (OldParam->hasDefaultArg()) { |
2511 | // We don't care what the value is (we won't use it); just create a |
2512 | // placeholder to indicate there is a default argument. |
2513 | QualType ParamTy = NewDI->getType(); |
2514 | NewDefArg = new (SemaRef.Context) |
2515 | OpaqueValueExpr(OldParam->getDefaultArg()->getBeginLoc(), |
2516 | ParamTy.getNonLValueExprType(SemaRef.Context), |
2517 | ParamTy->isLValueReferenceType() ? VK_LValue |
2518 | : ParamTy->isRValueReferenceType() ? VK_XValue |
2519 | : VK_PRValue); |
2520 | } |
2521 | |
2522 | ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC, |
2523 | OldParam->getInnerLocStart(), |
2524 | OldParam->getLocation(), |
2525 | OldParam->getIdentifier(), |
2526 | NewDI->getType(), |
2527 | NewDI, |
2528 | OldParam->getStorageClass(), |
2529 | NewDefArg.get()); |
2530 | NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(), |
2531 | OldParam->getFunctionScopeIndex()); |
2532 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, NewParam); |
2533 | return NewParam; |
2534 | } |
2535 | |
2536 | FunctionTemplateDecl *buildDeductionGuide( |
2537 | TemplateParameterList *TemplateParams, CXXConstructorDecl *Ctor, |
2538 | ExplicitSpecifier ES, TypeSourceInfo *TInfo, SourceLocation LocStart, |
2539 | SourceLocation Loc, SourceLocation LocEnd, |
2540 | llvm::ArrayRef<TypedefNameDecl *> MaterializedTypedefs = {}) { |
2541 | DeclarationNameInfo Name(DeductionGuideName, Loc); |
2542 | ArrayRef<ParmVarDecl *> Params = |
2543 | TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams(); |
2544 | |
2545 | // Build the implicit deduction guide template. |
2546 | auto *Guide = |
2547 | CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, ES, Name, |
2548 | TInfo->getType(), TInfo, LocEnd, Ctor); |
2549 | Guide->setImplicit(); |
2550 | Guide->setParams(Params); |
2551 | |
2552 | for (auto *Param : Params) |
2553 | Param->setDeclContext(Guide); |
2554 | for (auto *TD : MaterializedTypedefs) |
2555 | TD->setDeclContext(Guide); |
2556 | |
2557 | auto *GuideTemplate = FunctionTemplateDecl::Create( |
2558 | SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide); |
2559 | GuideTemplate->setImplicit(); |
2560 | Guide->setDescribedFunctionTemplate(GuideTemplate); |
2561 | |
2562 | if (isa<CXXRecordDecl>(DC)) { |
2563 | Guide->setAccess(AS_public); |
2564 | GuideTemplate->setAccess(AS_public); |
2565 | } |
2566 | |
2567 | DC->addDecl(GuideTemplate); |
2568 | return GuideTemplate; |
2569 | } |
2570 | }; |
2571 | } |
2572 | |
2573 | void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template, |
2574 | SourceLocation Loc) { |
2575 | if (CXXRecordDecl *DefRecord = |
2576 | cast<CXXRecordDecl>(Template->getTemplatedDecl())->getDefinition()) { |
2577 | TemplateDecl *DescribedTemplate = DefRecord->getDescribedClassTemplate(); |
2578 | Template = DescribedTemplate ? DescribedTemplate : Template; |
2579 | } |
2580 | |
2581 | DeclContext *DC = Template->getDeclContext(); |
2582 | if (DC->isDependentContext()) |
2583 | return; |
2584 | |
2585 | ConvertConstructorToDeductionGuideTransform Transform( |
2586 | *this, cast<ClassTemplateDecl>(Template)); |
2587 | if (!isCompleteType(Loc, Transform.DeducedType)) |
2588 | return; |
2589 | |
2590 | // Check whether we've already declared deduction guides for this template. |
2591 | // FIXME: Consider storing a flag on the template to indicate this. |
2592 | auto Existing = DC->lookup(Transform.DeductionGuideName); |
2593 | for (auto *D : Existing) |
2594 | if (D->isImplicit()) |
2595 | return; |
2596 | |
2597 | // In case we were expanding a pack when we attempted to declare deduction |
2598 | // guides, turn off pack expansion for everything we're about to do. |
2599 | ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1); |
2600 | // Create a template instantiation record to track the "instantiation" of |
2601 | // constructors into deduction guides. |
2602 | // FIXME: Add a kind for this to give more meaningful diagnostics. But can |
2603 | // this substitution process actually fail? |
2604 | InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template); |
2605 | if (BuildingDeductionGuides.isInvalid()) |
2606 | return; |
2607 | |
2608 | // Convert declared constructors into deduction guide templates. |
2609 | // FIXME: Skip constructors for which deduction must necessarily fail (those |
2610 | // for which some class template parameter without a default argument never |
2611 | // appears in a deduced context). |
2612 | llvm::SmallPtrSet<NamedDecl *, 8> ProcessedCtors; |
2613 | bool AddedAny = false; |
2614 | for (NamedDecl *D : LookupConstructors(Transform.Primary)) { |
2615 | D = D->getUnderlyingDecl(); |
2616 | if (D->isInvalidDecl() || D->isImplicit()) |
2617 | continue; |
2618 | |
2619 | D = cast<NamedDecl>(D->getCanonicalDecl()); |
2620 | |
2621 | // Within C++20 modules, we may have multiple same constructors in |
2622 | // multiple same RecordDecls. And it doesn't make sense to create |
2623 | // duplicated deduction guides for the duplicated constructors. |
2624 | if (ProcessedCtors.count(D)) |
2625 | continue; |
2626 | |
2627 | auto *FTD = dyn_cast<FunctionTemplateDecl>(D); |
2628 | auto *CD = |
2629 | dyn_cast_or_null<CXXConstructorDecl>(FTD ? FTD->getTemplatedDecl() : D); |
2630 | // Class-scope explicit specializations (MS extension) do not result in |
2631 | // deduction guides. |
2632 | if (!CD || (!FTD && CD->isFunctionTemplateSpecialization())) |
2633 | continue; |
2634 | |
2635 | // Cannot make a deduction guide when unparsed arguments are present. |
2636 | if (llvm::any_of(CD->parameters(), [](ParmVarDecl *P) { |
2637 | return !P || P->hasUnparsedDefaultArg(); |
2638 | })) |
2639 | continue; |
2640 | |
2641 | ProcessedCtors.insert(D); |
2642 | Transform.transformConstructor(FTD, CD); |
2643 | AddedAny = true; |
2644 | } |
2645 | |
2646 | // C++17 [over.match.class.deduct] |
2647 | // -- If C is not defined or does not declare any constructors, an |
2648 | // additional function template derived as above from a hypothetical |
2649 | // constructor C(). |
2650 | if (!AddedAny) |
2651 | Transform.buildSimpleDeductionGuide(std::nullopt); |
2652 | |
2653 | // -- An additional function template derived as above from a hypothetical |
2654 | // constructor C(C), called the copy deduction candidate. |
2655 | cast<CXXDeductionGuideDecl>( |
2656 | cast<FunctionTemplateDecl>( |
2657 | Transform.buildSimpleDeductionGuide(Transform.DeducedType)) |
2658 | ->getTemplatedDecl()) |
2659 | ->setIsCopyDeductionCandidate(); |
2660 | } |
2661 | |
2662 | /// Diagnose the presence of a default template argument on a |
2663 | /// template parameter, which is ill-formed in certain contexts. |
2664 | /// |
2665 | /// \returns true if the default template argument should be dropped. |
2666 | static bool DiagnoseDefaultTemplateArgument(Sema &S, |
2667 | Sema::TemplateParamListContext TPC, |
2668 | SourceLocation ParamLoc, |
2669 | SourceRange DefArgRange) { |
2670 | switch (TPC) { |
2671 | case Sema::TPC_ClassTemplate: |
2672 | case Sema::TPC_VarTemplate: |
2673 | case Sema::TPC_TypeAliasTemplate: |
2674 | return false; |
2675 | |
2676 | case Sema::TPC_FunctionTemplate: |
2677 | case Sema::TPC_FriendFunctionTemplateDefinition: |
2678 | // C++ [temp.param]p9: |
2679 | // A default template-argument shall not be specified in a |
2680 | // function template declaration or a function template |
2681 | // definition [...] |
2682 | // If a friend function template declaration specifies a default |
2683 | // template-argument, that declaration shall be a definition and shall be |
2684 | // the only declaration of the function template in the translation unit. |
2685 | // (C++98/03 doesn't have this wording; see DR226). |
2686 | S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ? |
2687 | diag::warn_cxx98_compat_template_parameter_default_in_function_template |
2688 | : diag::ext_template_parameter_default_in_function_template) |
2689 | << DefArgRange; |
2690 | return false; |
2691 | |
2692 | case Sema::TPC_ClassTemplateMember: |
2693 | // C++0x [temp.param]p9: |
2694 | // A default template-argument shall not be specified in the |
2695 | // template-parameter-lists of the definition of a member of a |
2696 | // class template that appears outside of the member's class. |
2697 | S.Diag(ParamLoc, diag::err_template_parameter_default_template_member) |
2698 | << DefArgRange; |
2699 | return true; |
2700 | |
2701 | case Sema::TPC_FriendClassTemplate: |
2702 | case Sema::TPC_FriendFunctionTemplate: |
2703 | // C++ [temp.param]p9: |
2704 | // A default template-argument shall not be specified in a |
2705 | // friend template declaration. |
2706 | S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template) |
2707 | << DefArgRange; |
2708 | return true; |
2709 | |
2710 | // FIXME: C++0x [temp.param]p9 allows default template-arguments |
2711 | // for friend function templates if there is only a single |
2712 | // declaration (and it is a definition). Strange! |
2713 | } |
2714 | |
2715 | llvm_unreachable("Invalid TemplateParamListContext!")::llvm::llvm_unreachable_internal("Invalid TemplateParamListContext!" , "clang/lib/Sema/SemaTemplate.cpp", 2715); |
2716 | } |
2717 | |
2718 | /// Check for unexpanded parameter packs within the template parameters |
2719 | /// of a template template parameter, recursively. |
2720 | static bool DiagnoseUnexpandedParameterPacks(Sema &S, |
2721 | TemplateTemplateParmDecl *TTP) { |
2722 | // A template template parameter which is a parameter pack is also a pack |
2723 | // expansion. |
2724 | if (TTP->isParameterPack()) |
2725 | return false; |
2726 | |
2727 | TemplateParameterList *Params = TTP->getTemplateParameters(); |
2728 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
2729 | NamedDecl *P = Params->getParam(I); |
2730 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(P)) { |
2731 | if (!TTP->isParameterPack()) |
2732 | if (const TypeConstraint *TC = TTP->getTypeConstraint()) |
2733 | if (TC->hasExplicitTemplateArgs()) |
2734 | for (auto &ArgLoc : TC->getTemplateArgsAsWritten()->arguments()) |
2735 | if (S.DiagnoseUnexpandedParameterPack(ArgLoc, |
2736 | Sema::UPPC_TypeConstraint)) |
2737 | return true; |
2738 | continue; |
2739 | } |
2740 | |
2741 | if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) { |
2742 | if (!NTTP->isParameterPack() && |
2743 | S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(), |
2744 | NTTP->getTypeSourceInfo(), |
2745 | Sema::UPPC_NonTypeTemplateParameterType)) |
2746 | return true; |
2747 | |
2748 | continue; |
2749 | } |
2750 | |
2751 | if (TemplateTemplateParmDecl *InnerTTP |
2752 | = dyn_cast<TemplateTemplateParmDecl>(P)) |
2753 | if (DiagnoseUnexpandedParameterPacks(S, InnerTTP)) |
2754 | return true; |
2755 | } |
2756 | |
2757 | return false; |
2758 | } |
2759 | |
2760 | /// Checks the validity of a template parameter list, possibly |
2761 | /// considering the template parameter list from a previous |
2762 | /// declaration. |
2763 | /// |
2764 | /// If an "old" template parameter list is provided, it must be |
2765 | /// equivalent (per TemplateParameterListsAreEqual) to the "new" |
2766 | /// template parameter list. |
2767 | /// |
2768 | /// \param NewParams Template parameter list for a new template |
2769 | /// declaration. This template parameter list will be updated with any |
2770 | /// default arguments that are carried through from the previous |
2771 | /// template parameter list. |
2772 | /// |
2773 | /// \param OldParams If provided, template parameter list from a |
2774 | /// previous declaration of the same template. Default template |
2775 | /// arguments will be merged from the old template parameter list to |
2776 | /// the new template parameter list. |
2777 | /// |
2778 | /// \param TPC Describes the context in which we are checking the given |
2779 | /// template parameter list. |
2780 | /// |
2781 | /// \param SkipBody If we might have already made a prior merged definition |
2782 | /// of this template visible, the corresponding body-skipping information. |
2783 | /// Default argument redefinition is not an error when skipping such a body, |
2784 | /// because (under the ODR) we can assume the default arguments are the same |
2785 | /// as the prior merged definition. |
2786 | /// |
2787 | /// \returns true if an error occurred, false otherwise. |
2788 | bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams, |
2789 | TemplateParameterList *OldParams, |
2790 | TemplateParamListContext TPC, |
2791 | SkipBodyInfo *SkipBody) { |
2792 | bool Invalid = false; |
2793 | |
2794 | // C++ [temp.param]p10: |
2795 | // The set of default template-arguments available for use with a |
2796 | // template declaration or definition is obtained by merging the |
2797 | // default arguments from the definition (if in scope) and all |
2798 | // declarations in scope in the same way default function |
2799 | // arguments are (8.3.6). |
2800 | bool SawDefaultArgument = false; |
2801 | SourceLocation PreviousDefaultArgLoc; |
2802 | |
2803 | // Dummy initialization to avoid warnings. |
2804 | TemplateParameterList::iterator OldParam = NewParams->end(); |
2805 | if (OldParams) |
2806 | OldParam = OldParams->begin(); |
2807 | |
2808 | bool RemoveDefaultArguments = false; |
2809 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
2810 | NewParamEnd = NewParams->end(); |
2811 | NewParam != NewParamEnd; ++NewParam) { |
2812 | // Whether we've seen a duplicate default argument in the same translation |
2813 | // unit. |
2814 | bool RedundantDefaultArg = false; |
2815 | // Whether we've found inconsis inconsitent default arguments in different |
2816 | // translation unit. |
2817 | bool InconsistentDefaultArg = false; |
2818 | // The name of the module which contains the inconsistent default argument. |
2819 | std::string PrevModuleName; |
2820 | |
2821 | SourceLocation OldDefaultLoc; |
2822 | SourceLocation NewDefaultLoc; |
2823 | |
2824 | // Variable used to diagnose missing default arguments |
2825 | bool MissingDefaultArg = false; |
2826 | |
2827 | // Variable used to diagnose non-final parameter packs |
2828 | bool SawParameterPack = false; |
2829 | |
2830 | if (TemplateTypeParmDecl *NewTypeParm |
2831 | = dyn_cast<TemplateTypeParmDecl>(*NewParam)) { |
2832 | // Check the presence of a default argument here. |
2833 | if (NewTypeParm->hasDefaultArgument() && |
2834 | DiagnoseDefaultTemplateArgument(*this, TPC, |
2835 | NewTypeParm->getLocation(), |
2836 | NewTypeParm->getDefaultArgumentInfo()->getTypeLoc() |
2837 | .getSourceRange())) |
2838 | NewTypeParm->removeDefaultArgument(); |
2839 | |
2840 | // Merge default arguments for template type parameters. |
2841 | TemplateTypeParmDecl *OldTypeParm |
2842 | = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr; |
2843 | if (NewTypeParm->isParameterPack()) { |
2844 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2845, __extension__ __PRETTY_FUNCTION__ )) |
2845 | "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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2845, __extension__ __PRETTY_FUNCTION__ )); |
2846 | SawParameterPack = true; |
2847 | } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) && |
2848 | NewTypeParm->hasDefaultArgument() && |
2849 | (!SkipBody || !SkipBody->ShouldSkip)) { |
2850 | OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc(); |
2851 | NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc(); |
2852 | SawDefaultArgument = true; |
2853 | |
2854 | if (!OldTypeParm->isInAnotherModuleUnit()) |
2855 | RedundantDefaultArg = true; |
2856 | else if (!getASTContext().isSameDefaultTemplateArgument(OldTypeParm, |
2857 | NewTypeParm)) { |
2858 | InconsistentDefaultArg = true; |
2859 | PrevModuleName = |
2860 | OldTypeParm->getImportedOwningModule()->getFullModuleName(); |
2861 | } |
2862 | PreviousDefaultArgLoc = NewDefaultLoc; |
2863 | } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) { |
2864 | // Merge the default argument from the old declaration to the |
2865 | // new declaration. |
2866 | NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm); |
2867 | PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc(); |
2868 | } else if (NewTypeParm->hasDefaultArgument()) { |
2869 | SawDefaultArgument = true; |
2870 | PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc(); |
2871 | } else if (SawDefaultArgument) |
2872 | MissingDefaultArg = true; |
2873 | } else if (NonTypeTemplateParmDecl *NewNonTypeParm |
2874 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) { |
2875 | // Check for unexpanded parameter packs. |
2876 | if (!NewNonTypeParm->isParameterPack() && |
2877 | DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(), |
2878 | NewNonTypeParm->getTypeSourceInfo(), |
2879 | UPPC_NonTypeTemplateParameterType)) { |
2880 | Invalid = true; |
2881 | continue; |
2882 | } |
2883 | |
2884 | // Check the presence of a default argument here. |
2885 | if (NewNonTypeParm->hasDefaultArgument() && |
2886 | DiagnoseDefaultTemplateArgument(*this, TPC, |
2887 | NewNonTypeParm->getLocation(), |
2888 | NewNonTypeParm->getDefaultArgument()->getSourceRange())) { |
2889 | NewNonTypeParm->removeDefaultArgument(); |
2890 | } |
2891 | |
2892 | // Merge default arguments for non-type template parameters |
2893 | NonTypeTemplateParmDecl *OldNonTypeParm |
2894 | = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr; |
2895 | if (NewNonTypeParm->isParameterPack()) { |
2896 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2897, __extension__ __PRETTY_FUNCTION__ )) |
2897 | "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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2897, __extension__ __PRETTY_FUNCTION__ )); |
2898 | if (!NewNonTypeParm->isPackExpansion()) |
2899 | SawParameterPack = true; |
2900 | } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) && |
2901 | NewNonTypeParm->hasDefaultArgument() && |
2902 | (!SkipBody || !SkipBody->ShouldSkip)) { |
2903 | OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
2904 | NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
2905 | SawDefaultArgument = true; |
2906 | if (!OldNonTypeParm->isInAnotherModuleUnit()) |
2907 | RedundantDefaultArg = true; |
2908 | else if (!getASTContext().isSameDefaultTemplateArgument( |
2909 | OldNonTypeParm, NewNonTypeParm)) { |
2910 | InconsistentDefaultArg = true; |
2911 | PrevModuleName = |
2912 | OldNonTypeParm->getImportedOwningModule()->getFullModuleName(); |
2913 | } |
2914 | PreviousDefaultArgLoc = NewDefaultLoc; |
2915 | } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) { |
2916 | // Merge the default argument from the old declaration to the |
2917 | // new declaration. |
2918 | NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm); |
2919 | PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
2920 | } else if (NewNonTypeParm->hasDefaultArgument()) { |
2921 | SawDefaultArgument = true; |
2922 | PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
2923 | } else if (SawDefaultArgument) |
2924 | MissingDefaultArg = true; |
2925 | } else { |
2926 | TemplateTemplateParmDecl *NewTemplateParm |
2927 | = cast<TemplateTemplateParmDecl>(*NewParam); |
2928 | |
2929 | // Check for unexpanded parameter packs, recursively. |
2930 | if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) { |
2931 | Invalid = true; |
2932 | continue; |
2933 | } |
2934 | |
2935 | // Check the presence of a default argument here. |
2936 | if (NewTemplateParm->hasDefaultArgument() && |
2937 | DiagnoseDefaultTemplateArgument(*this, TPC, |
2938 | NewTemplateParm->getLocation(), |
2939 | NewTemplateParm->getDefaultArgument().getSourceRange())) |
2940 | NewTemplateParm->removeDefaultArgument(); |
2941 | |
2942 | // Merge default arguments for template template parameters |
2943 | TemplateTemplateParmDecl *OldTemplateParm |
2944 | = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr; |
2945 | if (NewTemplateParm->isParameterPack()) { |
2946 | 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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2947, __extension__ __PRETTY_FUNCTION__ )) |
2947 | "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!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2947, __extension__ __PRETTY_FUNCTION__ )); |
2948 | if (!NewTemplateParm->isPackExpansion()) |
2949 | SawParameterPack = true; |
2950 | } else if (OldTemplateParm && |
2951 | hasVisibleDefaultArgument(OldTemplateParm) && |
2952 | NewTemplateParm->hasDefaultArgument() && |
2953 | (!SkipBody || !SkipBody->ShouldSkip)) { |
2954 | OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation(); |
2955 | NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation(); |
2956 | SawDefaultArgument = true; |
2957 | if (!OldTemplateParm->isInAnotherModuleUnit()) |
2958 | RedundantDefaultArg = true; |
2959 | else if (!getASTContext().isSameDefaultTemplateArgument( |
2960 | OldTemplateParm, NewTemplateParm)) { |
2961 | InconsistentDefaultArg = true; |
2962 | PrevModuleName = |
2963 | OldTemplateParm->getImportedOwningModule()->getFullModuleName(); |
2964 | } |
2965 | PreviousDefaultArgLoc = NewDefaultLoc; |
2966 | } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) { |
2967 | // Merge the default argument from the old declaration to the |
2968 | // new declaration. |
2969 | NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm); |
2970 | PreviousDefaultArgLoc |
2971 | = OldTemplateParm->getDefaultArgument().getLocation(); |
2972 | } else if (NewTemplateParm->hasDefaultArgument()) { |
2973 | SawDefaultArgument = true; |
2974 | PreviousDefaultArgLoc |
2975 | = NewTemplateParm->getDefaultArgument().getLocation(); |
2976 | } else if (SawDefaultArgument) |
2977 | MissingDefaultArg = true; |
2978 | } |
2979 | |
2980 | // C++11 [temp.param]p11: |
2981 | // If a template parameter of a primary class template or alias template |
2982 | // is a template parameter pack, it shall be the last template parameter. |
2983 | if (SawParameterPack && (NewParam + 1) != NewParamEnd && |
2984 | (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate || |
2985 | TPC == TPC_TypeAliasTemplate)) { |
2986 | Diag((*NewParam)->getLocation(), |
2987 | diag::err_template_param_pack_must_be_last_template_parameter); |
2988 | Invalid = true; |
2989 | } |
2990 | |
2991 | // [basic.def.odr]/13: |
2992 | // There can be more than one definition of a |
2993 | // ... |
2994 | // default template argument |
2995 | // ... |
2996 | // in a program provided that each definition appears in a different |
2997 | // translation unit and the definitions satisfy the [same-meaning |
2998 | // criteria of the ODR]. |
2999 | // |
3000 | // Simply, the design of modules allows the definition of template default |
3001 | // argument to be repeated across translation unit. Note that the ODR is |
3002 | // checked elsewhere. But it is still not allowed to repeat template default |
3003 | // argument in the same translation unit. |
3004 | if (RedundantDefaultArg) { |
3005 | Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition); |
3006 | Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg); |
3007 | Invalid = true; |
3008 | } else if (InconsistentDefaultArg) { |
3009 | // We could only diagnose about the case that the OldParam is imported. |
3010 | // The case NewParam is imported should be handled in ASTReader. |
3011 | Diag(NewDefaultLoc, |
3012 | diag::err_template_param_default_arg_inconsistent_redefinition); |
3013 | Diag(OldDefaultLoc, |
3014 | diag::note_template_param_prev_default_arg_in_other_module) |
3015 | << PrevModuleName; |
3016 | Invalid = true; |
3017 | } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) { |
3018 | // C++ [temp.param]p11: |
3019 | // If a template-parameter of a class template has a default |
3020 | // template-argument, each subsequent template-parameter shall either |
3021 | // have a default template-argument supplied or be a template parameter |
3022 | // pack. |
3023 | Diag((*NewParam)->getLocation(), |
3024 | diag::err_template_param_default_arg_missing); |
3025 | Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg); |
3026 | Invalid = true; |
3027 | RemoveDefaultArguments = true; |
3028 | } |
3029 | |
3030 | // If we have an old template parameter list that we're merging |
3031 | // in, move on to the next parameter. |
3032 | if (OldParams) |
3033 | ++OldParam; |
3034 | } |
3035 | |
3036 | // We were missing some default arguments at the end of the list, so remove |
3037 | // all of the default arguments. |
3038 | if (RemoveDefaultArguments) { |
3039 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
3040 | NewParamEnd = NewParams->end(); |
3041 | NewParam != NewParamEnd; ++NewParam) { |
3042 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam)) |
3043 | TTP->removeDefaultArgument(); |
3044 | else if (NonTypeTemplateParmDecl *NTTP |
3045 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) |
3046 | NTTP->removeDefaultArgument(); |
3047 | else |
3048 | cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument(); |
3049 | } |
3050 | } |
3051 | |
3052 | return Invalid; |
3053 | } |
3054 | |
3055 | namespace { |
3056 | |
3057 | /// A class which looks for a use of a certain level of template |
3058 | /// parameter. |
3059 | struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> { |
3060 | typedef RecursiveASTVisitor<DependencyChecker> super; |
3061 | |
3062 | unsigned Depth; |
3063 | |
3064 | // Whether we're looking for a use of a template parameter that makes the |
3065 | // overall construct type-dependent / a dependent type. This is strictly |
3066 | // best-effort for now; we may fail to match at all for a dependent type |
3067 | // in some cases if this is set. |
3068 | bool IgnoreNonTypeDependent; |
3069 | |
3070 | bool Match; |
3071 | SourceLocation MatchLoc; |
3072 | |
3073 | DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent) |
3074 | : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent), |
3075 | Match(false) {} |
3076 | |
3077 | DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent) |
3078 | : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) { |
3079 | NamedDecl *ND = Params->getParam(0); |
3080 | if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) { |
3081 | Depth = PD->getDepth(); |
3082 | } else if (NonTypeTemplateParmDecl *PD = |
3083 | dyn_cast<NonTypeTemplateParmDecl>(ND)) { |
3084 | Depth = PD->getDepth(); |
3085 | } else { |
3086 | Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth(); |
3087 | } |
3088 | } |
3089 | |
3090 | bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) { |
3091 | if (ParmDepth >= Depth) { |
3092 | Match = true; |
3093 | MatchLoc = Loc; |
3094 | return true; |
3095 | } |
3096 | return false; |
3097 | } |
3098 | |
3099 | bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) { |
3100 | // Prune out non-type-dependent expressions if requested. This can |
3101 | // sometimes result in us failing to find a template parameter reference |
3102 | // (if a value-dependent expression creates a dependent type), but this |
3103 | // mode is best-effort only. |
3104 | if (auto *E = dyn_cast_or_null<Expr>(S)) |
3105 | if (IgnoreNonTypeDependent && !E->isTypeDependent()) |
3106 | return true; |
3107 | return super::TraverseStmt(S, Q); |
3108 | } |
3109 | |
3110 | bool TraverseTypeLoc(TypeLoc TL) { |
3111 | if (IgnoreNonTypeDependent && !TL.isNull() && |
3112 | !TL.getType()->isDependentType()) |
3113 | return true; |
3114 | return super::TraverseTypeLoc(TL); |
3115 | } |
3116 | |
3117 | bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) { |
3118 | return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc()); |
3119 | } |
3120 | |
3121 | bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) { |
3122 | // For a best-effort search, keep looking until we find a location. |
3123 | return IgnoreNonTypeDependent || !Matches(T->getDepth()); |
3124 | } |
3125 | |
3126 | bool TraverseTemplateName(TemplateName N) { |
3127 | if (TemplateTemplateParmDecl *PD = |
3128 | dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl())) |
3129 | if (Matches(PD->getDepth())) |
3130 | return false; |
3131 | return super::TraverseTemplateName(N); |
3132 | } |
3133 | |
3134 | bool VisitDeclRefExpr(DeclRefExpr *E) { |
3135 | if (NonTypeTemplateParmDecl *PD = |
3136 | dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) |
3137 | if (Matches(PD->getDepth(), E->getExprLoc())) |
3138 | return false; |
3139 | return super::VisitDeclRefExpr(E); |
3140 | } |
3141 | |
3142 | bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) { |
3143 | return TraverseType(T->getReplacementType()); |
3144 | } |
3145 | |
3146 | bool |
3147 | VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) { |
3148 | return TraverseTemplateArgument(T->getArgumentPack()); |
3149 | } |
3150 | |
3151 | bool TraverseInjectedClassNameType(const InjectedClassNameType *T) { |
3152 | return TraverseType(T->getInjectedSpecializationType()); |
3153 | } |
3154 | }; |
3155 | } // end anonymous namespace |
3156 | |
3157 | /// Determines whether a given type depends on the given parameter |
3158 | /// list. |
3159 | static bool |
3160 | DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) { |
3161 | if (!Params->size()) |
3162 | return false; |
3163 | |
3164 | DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false); |
3165 | Checker.TraverseType(T); |
3166 | return Checker.Match; |
3167 | } |
3168 | |
3169 | // Find the source range corresponding to the named type in the given |
3170 | // nested-name-specifier, if any. |
3171 | static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context, |
3172 | QualType T, |
3173 | const CXXScopeSpec &SS) { |
3174 | NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data()); |
3175 | while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) { |
3176 | if (const Type *CurType = NNS->getAsType()) { |
3177 | if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0))) |
3178 | return NNSLoc.getTypeLoc().getSourceRange(); |
3179 | } else |
3180 | break; |
3181 | |
3182 | NNSLoc = NNSLoc.getPrefix(); |
3183 | } |
3184 | |
3185 | return SourceRange(); |
3186 | } |
3187 | |
3188 | /// Match the given template parameter lists to the given scope |
3189 | /// specifier, returning the template parameter list that applies to the |
3190 | /// name. |
3191 | /// |
3192 | /// \param DeclStartLoc the start of the declaration that has a scope |
3193 | /// specifier or a template parameter list. |
3194 | /// |
3195 | /// \param DeclLoc The location of the declaration itself. |
3196 | /// |
3197 | /// \param SS the scope specifier that will be matched to the given template |
3198 | /// parameter lists. This scope specifier precedes a qualified name that is |
3199 | /// being declared. |
3200 | /// |
3201 | /// \param TemplateId The template-id following the scope specifier, if there |
3202 | /// is one. Used to check for a missing 'template<>'. |
3203 | /// |
3204 | /// \param ParamLists the template parameter lists, from the outermost to the |
3205 | /// innermost template parameter lists. |
3206 | /// |
3207 | /// \param IsFriend Whether to apply the slightly different rules for |
3208 | /// matching template parameters to scope specifiers in friend |
3209 | /// declarations. |
3210 | /// |
3211 | /// \param IsMemberSpecialization will be set true if the scope specifier |
3212 | /// denotes a fully-specialized type, and therefore this is a declaration of |
3213 | /// a member specialization. |
3214 | /// |
3215 | /// \returns the template parameter list, if any, that corresponds to the |
3216 | /// name that is preceded by the scope specifier @p SS. This template |
3217 | /// parameter list may have template parameters (if we're declaring a |
3218 | /// template) or may have no template parameters (if we're declaring a |
3219 | /// template specialization), or may be NULL (if what we're declaring isn't |
3220 | /// itself a template). |
3221 | TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier( |
3222 | SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS, |
3223 | TemplateIdAnnotation *TemplateId, |
3224 | ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend, |
3225 | bool &IsMemberSpecialization, bool &Invalid, bool SuppressDiagnostic) { |
3226 | IsMemberSpecialization = false; |
3227 | Invalid = false; |
3228 | |
3229 | // The sequence of nested types to which we will match up the template |
3230 | // parameter lists. We first build this list by starting with the type named |
3231 | // by the nested-name-specifier and walking out until we run out of types. |
3232 | SmallVector<QualType, 4> NestedTypes; |
3233 | QualType T; |
3234 | if (SS.getScopeRep()) { |
3235 | if (CXXRecordDecl *Record |
3236 | = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true))) |
3237 | T = Context.getTypeDeclType(Record); |
3238 | else |
3239 | T = QualType(SS.getScopeRep()->getAsType(), 0); |
3240 | } |
3241 | |
3242 | // If we found an explicit specialization that prevents us from needing |
3243 | // 'template<>' headers, this will be set to the location of that |
3244 | // explicit specialization. |
3245 | SourceLocation ExplicitSpecLoc; |
3246 | |
3247 | while (!T.isNull()) { |
3248 | NestedTypes.push_back(T); |
3249 | |
3250 | // Retrieve the parent of a record type. |
3251 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
3252 | // If this type is an explicit specialization, we're done. |
3253 | if (ClassTemplateSpecializationDecl *Spec |
3254 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
3255 | if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) && |
3256 | Spec->getSpecializationKind() == TSK_ExplicitSpecialization) { |
3257 | ExplicitSpecLoc = Spec->getLocation(); |
3258 | break; |
3259 | } |
3260 | } else if (Record->getTemplateSpecializationKind() |
3261 | == TSK_ExplicitSpecialization) { |
3262 | ExplicitSpecLoc = Record->getLocation(); |
3263 | break; |
3264 | } |
3265 | |
3266 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent())) |
3267 | T = Context.getTypeDeclType(Parent); |
3268 | else |
3269 | T = QualType(); |
3270 | continue; |
3271 | } |
3272 | |
3273 | if (const TemplateSpecializationType *TST |
3274 | = T->getAs<TemplateSpecializationType>()) { |
3275 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
3276 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext())) |
3277 | T = Context.getTypeDeclType(Parent); |
3278 | else |
3279 | T = QualType(); |
3280 | continue; |
3281 | } |
3282 | } |
3283 | |
3284 | // Look one step prior in a dependent template specialization type. |
3285 | if (const DependentTemplateSpecializationType *DependentTST |
3286 | = T->getAs<DependentTemplateSpecializationType>()) { |
3287 | if (NestedNameSpecifier *NNS = DependentTST->getQualifier()) |
3288 | T = QualType(NNS->getAsType(), 0); |
3289 | else |
3290 | T = QualType(); |
3291 | continue; |
3292 | } |
3293 | |
3294 | // Look one step prior in a dependent name type. |
3295 | if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){ |
3296 | if (NestedNameSpecifier *NNS = DependentName->getQualifier()) |
3297 | T = QualType(NNS->getAsType(), 0); |
3298 | else |
3299 | T = QualType(); |
3300 | continue; |
3301 | } |
3302 | |
3303 | // Retrieve the parent of an enumeration type. |
3304 | if (const EnumType *EnumT = T->getAs<EnumType>()) { |
3305 | // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization |
3306 | // check here. |
3307 | EnumDecl *Enum = EnumT->getDecl(); |
3308 | |
3309 | // Get to the parent type. |
3310 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent())) |
3311 | T = Context.getTypeDeclType(Parent); |
3312 | else |
3313 | T = QualType(); |
3314 | continue; |
3315 | } |
3316 | |
3317 | T = QualType(); |
3318 | } |
3319 | // Reverse the nested types list, since we want to traverse from the outermost |
3320 | // to the innermost while checking template-parameter-lists. |
3321 | std::reverse(NestedTypes.begin(), NestedTypes.end()); |
3322 | |
3323 | // C++0x [temp.expl.spec]p17: |
3324 | // A member or a member template may be nested within many |
3325 | // enclosing class templates. In an explicit specialization for |
3326 | // such a member, the member declaration shall be preceded by a |
3327 | // template<> for each enclosing class template that is |
3328 | // explicitly specialized. |
3329 | bool SawNonEmptyTemplateParameterList = false; |
3330 | |
3331 | auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) { |
3332 | if (SawNonEmptyTemplateParameterList) { |
3333 | if (!SuppressDiagnostic) |
3334 | Diag(DeclLoc, diag::err_specialize_member_of_template) |
3335 | << !Recovery << Range; |
3336 | Invalid = true; |
3337 | IsMemberSpecialization = false; |
3338 | return true; |
3339 | } |
3340 | |
3341 | return false; |
3342 | }; |
3343 | |
3344 | auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) { |
3345 | // Check that we can have an explicit specialization here. |
3346 | if (CheckExplicitSpecialization(Range, true)) |
3347 | return true; |
3348 | |
3349 | // We don't have a template header, but we should. |
3350 | SourceLocation ExpectedTemplateLoc; |
3351 | if (!ParamLists.empty()) |
3352 | ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc(); |
3353 | else |
3354 | ExpectedTemplateLoc = DeclStartLoc; |
3355 | |
3356 | if (!SuppressDiagnostic) |
3357 | Diag(DeclLoc, diag::err_template_spec_needs_header) |
3358 | << Range |
3359 | << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> "); |
3360 | return false; |
3361 | }; |
3362 | |
3363 | unsigned ParamIdx = 0; |
3364 | for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes; |
3365 | ++TypeIdx) { |
3366 | T = NestedTypes[TypeIdx]; |
3367 | |
3368 | // Whether we expect a 'template<>' header. |
3369 | bool NeedEmptyTemplateHeader = false; |
3370 | |
3371 | // Whether we expect a template header with parameters. |
3372 | bool NeedNonemptyTemplateHeader = false; |
3373 | |
3374 | // For a dependent type, the set of template parameters that we |
3375 | // expect to see. |
3376 | TemplateParameterList *ExpectedTemplateParams = nullptr; |
3377 | |
3378 | // C++0x [temp.expl.spec]p15: |
3379 | // A member or a member template may be nested within many enclosing |
3380 | // class templates. In an explicit specialization for such a member, the |
3381 | // member declaration shall be preceded by a template<> for each |
3382 | // enclosing class template that is explicitly specialized. |
3383 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
3384 | if (ClassTemplatePartialSpecializationDecl *Partial |
3385 | = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { |
3386 | ExpectedTemplateParams = Partial->getTemplateParameters(); |
3387 | NeedNonemptyTemplateHeader = true; |
3388 | } else if (Record->isDependentType()) { |
3389 | if (Record->getDescribedClassTemplate()) { |
3390 | ExpectedTemplateParams = Record->getDescribedClassTemplate() |
3391 | ->getTemplateParameters(); |
3392 | NeedNonemptyTemplateHeader = true; |
3393 | } |
3394 | } else if (ClassTemplateSpecializationDecl *Spec |
3395 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
3396 | // C++0x [temp.expl.spec]p4: |
3397 | // Members of an explicitly specialized class template are defined |
3398 | // in the same manner as members of normal classes, and not using |
3399 | // the template<> syntax. |
3400 | if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization) |
3401 | NeedEmptyTemplateHeader = true; |
3402 | else |
3403 | continue; |
3404 | } else if (Record->getTemplateSpecializationKind()) { |
3405 | if (Record->getTemplateSpecializationKind() |
3406 | != TSK_ExplicitSpecialization && |
3407 | TypeIdx == NumTypes - 1) |
3408 | IsMemberSpecialization = true; |
3409 | |
3410 | continue; |
3411 | } |
3412 | } else if (const TemplateSpecializationType *TST |
3413 | = T->getAs<TemplateSpecializationType>()) { |
3414 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
3415 | ExpectedTemplateParams = Template->getTemplateParameters(); |
3416 | NeedNonemptyTemplateHeader = true; |
3417 | } |
3418 | } else if (T->getAs<DependentTemplateSpecializationType>()) { |
3419 | // FIXME: We actually could/should check the template arguments here |
3420 | // against the corresponding template parameter list. |
3421 | NeedNonemptyTemplateHeader = false; |
3422 | } |
3423 | |
3424 | // C++ [temp.expl.spec]p16: |
3425 | // In an explicit specialization declaration for a member of a class |
3426 | // template or a member template that ap- pears in namespace scope, the |
3427 | // member template and some of its enclosing class templates may remain |
3428 | // unspecialized, except that the declaration shall not explicitly |
3429 | // specialize a class member template if its en- closing class templates |
3430 | // are not explicitly specialized as well. |
3431 | if (ParamIdx < ParamLists.size()) { |
3432 | if (ParamLists[ParamIdx]->size() == 0) { |
3433 | if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), |
3434 | false)) |
3435 | return nullptr; |
3436 | } else |
3437 | SawNonEmptyTemplateParameterList = true; |
3438 | } |
3439 | |
3440 | if (NeedEmptyTemplateHeader) { |
3441 | // If we're on the last of the types, and we need a 'template<>' header |
3442 | // here, then it's a member specialization. |
3443 | if (TypeIdx == NumTypes - 1) |
3444 | IsMemberSpecialization = true; |
3445 | |
3446 | if (ParamIdx < ParamLists.size()) { |
3447 | if (ParamLists[ParamIdx]->size() > 0) { |
3448 | // The header has template parameters when it shouldn't. Complain. |
3449 | if (!SuppressDiagnostic) |
3450 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
3451 | diag::err_template_param_list_matches_nontemplate) |
3452 | << T |
3453 | << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(), |
3454 | ParamLists[ParamIdx]->getRAngleLoc()) |
3455 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
3456 | Invalid = true; |
3457 | return nullptr; |
3458 | } |
3459 | |
3460 | // Consume this template header. |
3461 | ++ParamIdx; |
3462 | continue; |
3463 | } |
3464 | |
3465 | if (!IsFriend) |
3466 | if (DiagnoseMissingExplicitSpecialization( |
3467 | getRangeOfTypeInNestedNameSpecifier(Context, T, SS))) |
3468 | return nullptr; |
3469 | |
3470 | continue; |
3471 | } |
3472 | |
3473 | if (NeedNonemptyTemplateHeader) { |
3474 | // In friend declarations we can have template-ids which don't |
3475 | // depend on the corresponding template parameter lists. But |
3476 | // assume that empty parameter lists are supposed to match this |
3477 | // template-id. |
3478 | if (IsFriend && T->isDependentType()) { |
3479 | if (ParamIdx < ParamLists.size() && |
3480 | DependsOnTemplateParameters(T, ParamLists[ParamIdx])) |
3481 | ExpectedTemplateParams = nullptr; |
3482 | else |
3483 | continue; |
3484 | } |
3485 | |
3486 | if (ParamIdx < ParamLists.size()) { |
3487 | // Check the template parameter list, if we can. |
3488 | if (ExpectedTemplateParams && |
3489 | !TemplateParameterListsAreEqual(ParamLists[ParamIdx], |
3490 | ExpectedTemplateParams, |
3491 | !SuppressDiagnostic, TPL_TemplateMatch)) |
3492 | Invalid = true; |
3493 | |
3494 | if (!Invalid && |
3495 | CheckTemplateParameterList(ParamLists[ParamIdx], nullptr, |
3496 | TPC_ClassTemplateMember)) |
3497 | Invalid = true; |
3498 | |
3499 | ++ParamIdx; |
3500 | continue; |
3501 | } |
3502 | |
3503 | if (!SuppressDiagnostic) |
3504 | Diag(DeclLoc, diag::err_template_spec_needs_template_parameters) |
3505 | << T |
3506 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
3507 | Invalid = true; |
3508 | continue; |
3509 | } |
3510 | } |
3511 | |
3512 | // If there were at least as many template-ids as there were template |
3513 | // parameter lists, then there are no template parameter lists remaining for |
3514 | // the declaration itself. |
3515 | if (ParamIdx >= ParamLists.size()) { |
3516 | if (TemplateId && !IsFriend) { |
3517 | // We don't have a template header for the declaration itself, but we |
3518 | // should. |
3519 | DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc, |
3520 | TemplateId->RAngleLoc)); |
3521 | |
3522 | // Fabricate an empty template parameter list for the invented header. |
3523 | return TemplateParameterList::Create(Context, SourceLocation(), |
3524 | SourceLocation(), std::nullopt, |
3525 | SourceLocation(), nullptr); |
3526 | } |
3527 | |
3528 | return nullptr; |
3529 | } |
3530 | |
3531 | // If there were too many template parameter lists, complain about that now. |
3532 | if (ParamIdx < ParamLists.size() - 1) { |
3533 | bool HasAnyExplicitSpecHeader = false; |
3534 | bool AllExplicitSpecHeaders = true; |
3535 | for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) { |
3536 | if (ParamLists[I]->size() == 0) |
3537 | HasAnyExplicitSpecHeader = true; |
3538 | else |
3539 | AllExplicitSpecHeaders = false; |
3540 | } |
3541 | |
3542 | if (!SuppressDiagnostic) |
3543 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
3544 | AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers |
3545 | : diag::err_template_spec_extra_headers) |
3546 | << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(), |
3547 | ParamLists[ParamLists.size() - 2]->getRAngleLoc()); |
3548 | |
3549 | // If there was a specialization somewhere, such that 'template<>' is |
3550 | // not required, and there were any 'template<>' headers, note where the |
3551 | // specialization occurred. |
3552 | if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader && |
3553 | !SuppressDiagnostic) |
3554 | Diag(ExplicitSpecLoc, |
3555 | diag::note_explicit_template_spec_does_not_need_header) |
3556 | << NestedTypes.back(); |
3557 | |
3558 | // We have a template parameter list with no corresponding scope, which |
3559 | // means that the resulting template declaration can't be instantiated |
3560 | // properly (we'll end up with dependent nodes when we shouldn't). |
3561 | if (!AllExplicitSpecHeaders) |
3562 | Invalid = true; |
3563 | } |
3564 | |
3565 | // C++ [temp.expl.spec]p16: |
3566 | // In an explicit specialization declaration for a member of a class |
3567 | // template or a member template that ap- pears in namespace scope, the |
3568 | // member template and some of its enclosing class templates may remain |
3569 | // unspecialized, except that the declaration shall not explicitly |
3570 | // specialize a class member template if its en- closing class templates |
3571 | // are not explicitly specialized as well. |
3572 | if (ParamLists.back()->size() == 0 && |
3573 | CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), |
3574 | false)) |
3575 | return nullptr; |
3576 | |
3577 | // Return the last template parameter list, which corresponds to the |
3578 | // entity being declared. |
3579 | return ParamLists.back(); |
3580 | } |
3581 | |
3582 | void Sema::NoteAllFoundTemplates(TemplateName Name) { |
3583 | if (TemplateDecl *Template = Name.getAsTemplateDecl()) { |
3584 | Diag(Template->getLocation(), diag::note_template_declared_here) |
3585 | << (isa<FunctionTemplateDecl>(Template) |
3586 | ? 0 |
3587 | : isa<ClassTemplateDecl>(Template) |
3588 | ? 1 |
3589 | : isa<VarTemplateDecl>(Template) |
3590 | ? 2 |
3591 | : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4) |
3592 | << Template->getDeclName(); |
3593 | return; |
3594 | } |
3595 | |
3596 | if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) { |
3597 | for (OverloadedTemplateStorage::iterator I = OST->begin(), |
3598 | IEnd = OST->end(); |
3599 | I != IEnd; ++I) |
3600 | Diag((*I)->getLocation(), diag::note_template_declared_here) |
3601 | << 0 << (*I)->getDeclName(); |
3602 | |
3603 | return; |
3604 | } |
3605 | } |
3606 | |
3607 | static QualType |
3608 | checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD, |
3609 | ArrayRef<TemplateArgument> Converted, |
3610 | SourceLocation TemplateLoc, |
3611 | TemplateArgumentListInfo &TemplateArgs) { |
3612 | ASTContext &Context = SemaRef.getASTContext(); |
3613 | |
3614 | switch (BTD->getBuiltinTemplateKind()) { |
3615 | case BTK__make_integer_seq: { |
3616 | // Specializations of __make_integer_seq<S, T, N> are treated like |
3617 | // S<T, 0, ..., N-1>. |
3618 | |
3619 | QualType OrigType = Converted[1].getAsType(); |
3620 | // C++14 [inteseq.intseq]p1: |
3621 | // T shall be an integer type. |
3622 | if (!OrigType->isDependentType() && !OrigType->isIntegralType(Context)) { |
3623 | SemaRef.Diag(TemplateArgs[1].getLocation(), |
3624 | diag::err_integer_sequence_integral_element_type); |
3625 | return QualType(); |
3626 | } |
3627 | |
3628 | TemplateArgument NumArgsArg = Converted[2]; |
3629 | if (NumArgsArg.isDependent()) |
3630 | return Context.getCanonicalTemplateSpecializationType(TemplateName(BTD), |
3631 | Converted); |
3632 | |
3633 | TemplateArgumentListInfo SyntheticTemplateArgs; |
3634 | // The type argument, wrapped in substitution sugar, gets reused as the |
3635 | // first template argument in the synthetic template argument list. |
3636 | SyntheticTemplateArgs.addArgument( |
3637 | TemplateArgumentLoc(TemplateArgument(OrigType), |
3638 | SemaRef.Context.getTrivialTypeSourceInfo( |
3639 | OrigType, TemplateArgs[1].getLocation()))); |
3640 | |
3641 | if (llvm::APSInt NumArgs = NumArgsArg.getAsIntegral(); NumArgs >= 0) { |
3642 | // Expand N into 0 ... N-1. |
3643 | for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned()); |
3644 | I < NumArgs; ++I) { |
3645 | TemplateArgument TA(Context, I, OrigType); |
3646 | SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc( |
3647 | TA, OrigType, TemplateArgs[2].getLocation())); |
3648 | } |
3649 | } else { |
3650 | // C++14 [inteseq.make]p1: |
3651 | // If N is negative the program is ill-formed. |
3652 | SemaRef.Diag(TemplateArgs[2].getLocation(), |
3653 | diag::err_integer_sequence_negative_length); |
3654 | return QualType(); |
3655 | } |
3656 | |
3657 | // The first template argument will be reused as the template decl that |
3658 | // our synthetic template arguments will be applied to. |
3659 | return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(), |
3660 | TemplateLoc, SyntheticTemplateArgs); |
3661 | } |
3662 | |
3663 | case BTK__type_pack_element: |
3664 | // Specializations of |
3665 | // __type_pack_element<Index, T_1, ..., T_N> |
3666 | // are treated like T_Index. |
3667 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 3668, __extension__ __PRETTY_FUNCTION__ )) |
3668 | "__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\"" , "clang/lib/Sema/SemaTemplate.cpp", 3668, __extension__ __PRETTY_FUNCTION__ )); |
3669 | |
3670 | TemplateArgument IndexArg = Converted[0], Ts = Converted[1]; |
3671 | if (IndexArg.isDependent() || Ts.isDependent()) |
3672 | return Context.getCanonicalTemplateSpecializationType(TemplateName(BTD), |
3673 | Converted); |
3674 | |
3675 | llvm::APSInt Index = IndexArg.getAsIntegral(); |
3676 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 3677, __extension__ __PRETTY_FUNCTION__ )) |
3677 | "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\"" , "clang/lib/Sema/SemaTemplate.cpp", 3677, __extension__ __PRETTY_FUNCTION__ )); |
3678 | // If the Index is out of bounds, the program is ill-formed. |
3679 | if (Index >= Ts.pack_size()) { |
3680 | SemaRef.Diag(TemplateArgs[0].getLocation(), |
3681 | diag::err_type_pack_element_out_of_bounds); |
3682 | return QualType(); |
3683 | } |
3684 | |
3685 | // We simply return the type at index `Index`. |
3686 | int64_t N = Index.getExtValue(); |
3687 | return Ts.getPackAsArray()[N].getAsType(); |
3688 | } |
3689 | llvm_unreachable("unexpected BuiltinTemplateDecl!")::llvm::llvm_unreachable_internal("unexpected BuiltinTemplateDecl!" , "clang/lib/Sema/SemaTemplate.cpp", 3689); |
3690 | } |
3691 | |
3692 | /// Determine whether this alias template is "enable_if_t". |
3693 | /// libc++ >=14 uses "__enable_if_t" in C++11 mode. |
3694 | static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) { |
3695 | return AliasTemplate->getName().equals("enable_if_t") || |
3696 | AliasTemplate->getName().equals("__enable_if_t"); |
3697 | } |
3698 | |
3699 | /// Collect all of the separable terms in the given condition, which |
3700 | /// might be a conjunction. |
3701 | /// |
3702 | /// FIXME: The right answer is to convert the logical expression into |
3703 | /// disjunctive normal form, so we can find the first failed term |
3704 | /// within each possible clause. |
3705 | static void collectConjunctionTerms(Expr *Clause, |
3706 | SmallVectorImpl<Expr *> &Terms) { |
3707 | if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) { |
3708 | if (BinOp->getOpcode() == BO_LAnd) { |
3709 | collectConjunctionTerms(BinOp->getLHS(), Terms); |
3710 | collectConjunctionTerms(BinOp->getRHS(), Terms); |
3711 | return; |
3712 | } |
3713 | } |
3714 | |
3715 | Terms.push_back(Clause); |
3716 | } |
3717 | |
3718 | // The ranges-v3 library uses an odd pattern of a top-level "||" with |
3719 | // a left-hand side that is value-dependent but never true. Identify |
3720 | // the idiom and ignore that term. |
3721 | static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) { |
3722 | // Top-level '||'. |
3723 | auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts()); |
3724 | if (!BinOp) return Cond; |
3725 | |
3726 | if (BinOp->getOpcode() != BO_LOr) return Cond; |
3727 | |
3728 | // With an inner '==' that has a literal on the right-hand side. |
3729 | Expr *LHS = BinOp->getLHS(); |
3730 | auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts()); |
3731 | if (!InnerBinOp) return Cond; |
3732 | |
3733 | if (InnerBinOp->getOpcode() != BO_EQ || |
3734 | !isa<IntegerLiteral>(InnerBinOp->getRHS())) |
3735 | return Cond; |
3736 | |
3737 | // If the inner binary operation came from a macro expansion named |
3738 | // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side |
3739 | // of the '||', which is the real, user-provided condition. |
3740 | SourceLocation Loc = InnerBinOp->getExprLoc(); |
3741 | if (!Loc.isMacroID()) return Cond; |
3742 | |
3743 | StringRef MacroName = PP.getImmediateMacroName(Loc); |
3744 | if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_") |
3745 | return BinOp->getRHS(); |
3746 | |
3747 | return Cond; |
3748 | } |
3749 | |
3750 | namespace { |
3751 | |
3752 | // A PrinterHelper that prints more helpful diagnostics for some sub-expressions |
3753 | // within failing boolean expression, such as substituting template parameters |
3754 | // for actual types. |
3755 | class FailedBooleanConditionPrinterHelper : public PrinterHelper { |
3756 | public: |
3757 | explicit FailedBooleanConditionPrinterHelper(const PrintingPolicy &P) |
3758 | : Policy(P) {} |
3759 | |
3760 | bool handledStmt(Stmt *E, raw_ostream &OS) override { |
3761 | const auto *DR = dyn_cast<DeclRefExpr>(E); |
3762 | if (DR && DR->getQualifier()) { |
3763 | // If this is a qualified name, expand the template arguments in nested |
3764 | // qualifiers. |
3765 | DR->getQualifier()->print(OS, Policy, true); |
3766 | // Then print the decl itself. |
3767 | const ValueDecl *VD = DR->getDecl(); |
3768 | OS << VD->getName(); |
3769 | if (const auto *IV = dyn_cast<VarTemplateSpecializationDecl>(VD)) { |
3770 | // This is a template variable, print the expanded template arguments. |
3771 | printTemplateArgumentList( |
3772 | OS, IV->getTemplateArgs().asArray(), Policy, |
3773 | IV->getSpecializedTemplate()->getTemplateParameters()); |
3774 | } |
3775 | return true; |
3776 | } |
3777 | return false; |
3778 | } |
3779 | |
3780 | private: |
3781 | const PrintingPolicy Policy; |
3782 | }; |
3783 | |
3784 | } // end anonymous namespace |
3785 | |
3786 | std::pair<Expr *, std::string> |
3787 | Sema::findFailedBooleanCondition(Expr *Cond) { |
3788 | Cond = lookThroughRangesV3Condition(PP, Cond); |
3789 | |
3790 | // Separate out all of the terms in a conjunction. |
3791 | SmallVector<Expr *, 4> Terms; |
3792 | collectConjunctionTerms(Cond, Terms); |
3793 | |
3794 | // Determine which term failed. |
3795 | Expr *FailedCond = nullptr; |
3796 | for (Expr *Term : Terms) { |
3797 | Expr *TermAsWritten = Term->IgnoreParenImpCasts(); |
3798 | |
3799 | // Literals are uninteresting. |
3800 | if (isa<CXXBoolLiteralExpr>(TermAsWritten) || |
3801 | isa<IntegerLiteral>(TermAsWritten)) |
3802 | continue; |
3803 | |
3804 | // The initialization of the parameter from the argument is |
3805 | // a constant-evaluated context. |
3806 | EnterExpressionEvaluationContext ConstantEvaluated( |
3807 | *this, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
3808 | |
3809 | bool Succeeded; |
3810 | if (Term->EvaluateAsBooleanCondition(Succeeded, Context) && |
3811 | !Succeeded) { |
3812 | FailedCond = TermAsWritten; |
3813 | break; |
3814 | } |
3815 | } |
3816 | if (!FailedCond) |
3817 | FailedCond = Cond->IgnoreParenImpCasts(); |
3818 | |
3819 | std::string Description; |
3820 | { |
3821 | llvm::raw_string_ostream Out(Description); |
3822 | PrintingPolicy Policy = getPrintingPolicy(); |
3823 | Policy.PrintCanonicalTypes = true; |
3824 | FailedBooleanConditionPrinterHelper Helper(Policy); |
3825 | FailedCond->printPretty(Out, &Helper, Policy, 0, "\n", nullptr); |
3826 | } |
3827 | return { FailedCond, Description }; |
3828 | } |
3829 | |
3830 | QualType Sema::CheckTemplateIdType(TemplateName Name, |
3831 | SourceLocation TemplateLoc, |
3832 | TemplateArgumentListInfo &TemplateArgs) { |
3833 | DependentTemplateName *DTN |
3834 | = Name.getUnderlying().getAsDependentTemplateName(); |
3835 | if (DTN && DTN->isIdentifier()) |
3836 | // When building a template-id where the template-name is dependent, |
3837 | // assume the template is a type template. Either our assumption is |
3838 | // correct, or the code is ill-formed and will be diagnosed when the |
3839 | // dependent name is substituted. |
3840 | return Context.getDependentTemplateSpecializationType( |
3841 | ETK_None, DTN->getQualifier(), DTN->getIdentifier(), |
3842 | TemplateArgs.arguments()); |
3843 | |
3844 | if (Name.getAsAssumedTemplateName() && |
3845 | resolveAssumedTemplateNameAsType(/*Scope*/nullptr, Name, TemplateLoc)) |
3846 | return QualType(); |
3847 | |
3848 | TemplateDecl *Template = Name.getAsTemplateDecl(); |
3849 | if (!Template || isa<FunctionTemplateDecl>(Template) || |
3850 | isa<VarTemplateDecl>(Template) || isa<ConceptDecl>(Template)) { |
3851 | // We might have a substituted template template parameter pack. If so, |
3852 | // build a template specialization type for it. |
3853 | if (Name.getAsSubstTemplateTemplateParmPack()) |
3854 | return Context.getTemplateSpecializationType(Name, |
3855 | TemplateArgs.arguments()); |
3856 | |
3857 | Diag(TemplateLoc, diag::err_template_id_not_a_type) |
3858 | << Name; |
3859 | NoteAllFoundTemplates(Name); |
3860 | return QualType(); |
3861 | } |
3862 | |
3863 | // Check that the template argument list is well-formed for this |
3864 | // template. |
3865 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
3866 | if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs, false, |
3867 | SugaredConverted, CanonicalConverted, |
3868 | /*UpdateArgsWithConversions=*/true)) |
3869 | return QualType(); |
3870 | |
3871 | QualType CanonType; |
3872 | |
3873 | if (TypeAliasTemplateDecl *AliasTemplate = |
3874 | dyn_cast<TypeAliasTemplateDecl>(Template)) { |
3875 | |
3876 | // Find the canonical type for this type alias template specialization. |
3877 | TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl(); |
3878 | if (Pattern->isInvalidDecl()) |
3879 | return QualType(); |
3880 | |
3881 | // Only substitute for the innermost template argument list. |
3882 | MultiLevelTemplateArgumentList TemplateArgLists; |
3883 | TemplateArgLists.addOuterTemplateArguments(Template, CanonicalConverted, |
3884 | /*Final=*/false); |
3885 | TemplateArgLists.addOuterRetainedLevels( |
3886 | AliasTemplate->getTemplateParameters()->getDepth()); |
3887 | |
3888 | LocalInstantiationScope Scope(*this); |
3889 | InstantiatingTemplate Inst(*this, TemplateLoc, Template); |
3890 | if (Inst.isInvalid()) |
3891 | return QualType(); |
3892 | |
3893 | CanonType = SubstType(Pattern->getUnderlyingType(), |
3894 | TemplateArgLists, AliasTemplate->getLocation(), |
3895 | AliasTemplate->getDeclName()); |
3896 | if (CanonType.isNull()) { |
3897 | // If this was enable_if and we failed to find the nested type |
3898 | // within enable_if in a SFINAE context, dig out the specific |
3899 | // enable_if condition that failed and present that instead. |
3900 | if (isEnableIfAliasTemplate(AliasTemplate)) { |
3901 | if (auto DeductionInfo = isSFINAEContext()) { |
3902 | if (*DeductionInfo && |
3903 | (*DeductionInfo)->hasSFINAEDiagnostic() && |
3904 | (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() == |
3905 | diag::err_typename_nested_not_found_enable_if && |
3906 | TemplateArgs[0].getArgument().getKind() |
3907 | == TemplateArgument::Expression) { |
3908 | Expr *FailedCond; |
3909 | std::string FailedDescription; |
3910 | std::tie(FailedCond, FailedDescription) = |
3911 | findFailedBooleanCondition(TemplateArgs[0].getSourceExpression()); |
3912 | |
3913 | // Remove the old SFINAE diagnostic. |
3914 | PartialDiagnosticAt OldDiag = |
3915 | {SourceLocation(), PartialDiagnostic::NullDiagnostic()}; |
3916 | (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag); |
3917 | |
3918 | // Add a new SFINAE diagnostic specifying which condition |
3919 | // failed. |
3920 | (*DeductionInfo)->addSFINAEDiagnostic( |
3921 | OldDiag.first, |
3922 | PDiag(diag::err_typename_nested_not_found_requirement) |
3923 | << FailedDescription |
3924 | << FailedCond->getSourceRange()); |
3925 | } |
3926 | } |
3927 | } |
3928 | |
3929 | return QualType(); |
3930 | } |
3931 | } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) { |
3932 | CanonType = checkBuiltinTemplateIdType(*this, BTD, SugaredConverted, |
3933 | TemplateLoc, TemplateArgs); |
3934 | } else if (Name.isDependent() || |
3935 | TemplateSpecializationType::anyDependentTemplateArguments( |
3936 | TemplateArgs, CanonicalConverted)) { |
3937 | // This class template specialization is a dependent |
3938 | // type. Therefore, its canonical type is another class template |
3939 | // specialization type that contains all of the converted |
3940 | // arguments in canonical form. This ensures that, e.g., A<T> and |
3941 | // A<T, T> have identical types when A is declared as: |
3942 | // |
3943 | // template<typename T, typename U = T> struct A; |
3944 | CanonType = Context.getCanonicalTemplateSpecializationType( |
3945 | Name, CanonicalConverted); |
3946 | |
3947 | // This might work out to be a current instantiation, in which |
3948 | // case the canonical type needs to be the InjectedClassNameType. |
3949 | // |
3950 | // TODO: in theory this could be a simple hashtable lookup; most |
3951 | // changes to CurContext don't change the set of current |
3952 | // instantiations. |
3953 | if (isa<ClassTemplateDecl>(Template)) { |
3954 | for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) { |
3955 | // If we get out to a namespace, we're done. |
3956 | if (Ctx->isFileContext()) break; |
3957 | |
3958 | // If this isn't a record, keep looking. |
3959 | CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx); |
3960 | if (!Record) continue; |
3961 | |
3962 | // Look for one of the two cases with InjectedClassNameTypes |
3963 | // and check whether it's the same template. |
3964 | if (!isa<ClassTemplatePartialSpecializationDecl>(Record) && |
3965 | !Record->getDescribedClassTemplate()) |
3966 | continue; |
3967 | |
3968 | // Fetch the injected class name type and check whether its |
3969 | // injected type is equal to the type we just built. |
3970 | QualType ICNT = Context.getTypeDeclType(Record); |
3971 | QualType Injected = cast<InjectedClassNameType>(ICNT) |
3972 | ->getInjectedSpecializationType(); |
3973 | |
3974 | if (CanonType != Injected->getCanonicalTypeInternal()) |
3975 | continue; |
3976 | |
3977 | // If so, the canonical type of this TST is the injected |
3978 | // class name type of the record we just found. |
3979 | assert(ICNT.isCanonical())(static_cast <bool> (ICNT.isCanonical()) ? void (0) : __assert_fail ("ICNT.isCanonical()", "clang/lib/Sema/SemaTemplate.cpp", 3979 , __extension__ __PRETTY_FUNCTION__)); |
3980 | CanonType = ICNT; |
3981 | break; |
3982 | } |
3983 | } |
3984 | } else if (ClassTemplateDecl *ClassTemplate = |
3985 | dyn_cast<ClassTemplateDecl>(Template)) { |
3986 | // Find the class template specialization declaration that |
3987 | // corresponds to these arguments. |
3988 | void *InsertPos = nullptr; |
3989 | ClassTemplateSpecializationDecl *Decl = |
3990 | ClassTemplate->findSpecialization(CanonicalConverted, InsertPos); |
3991 | if (!Decl) { |
3992 | // This is the first time we have referenced this class template |
3993 | // specialization. Create the canonical declaration and add it to |
3994 | // the set of specializations. |
3995 | Decl = ClassTemplateSpecializationDecl::Create( |
3996 | Context, ClassTemplate->getTemplatedDecl()->getTagKind(), |
3997 | ClassTemplate->getDeclContext(), |
3998 | ClassTemplate->getTemplatedDecl()->getBeginLoc(), |
3999 | ClassTemplate->getLocation(), ClassTemplate, CanonicalConverted, |
4000 | nullptr); |
4001 | ClassTemplate->AddSpecialization(Decl, InsertPos); |
4002 | if (ClassTemplate->isOutOfLine()) |
4003 | Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext()); |
4004 | } |
4005 | |
4006 | if (Decl->getSpecializationKind() == TSK_Undeclared && |
4007 | ClassTemplate->getTemplatedDecl()->hasAttrs()) { |
4008 | InstantiatingTemplate Inst(*this, TemplateLoc, Decl); |
4009 | if (!Inst.isInvalid()) { |
4010 | MultiLevelTemplateArgumentList TemplateArgLists(Template, |
4011 | CanonicalConverted, |
4012 | /*Final=*/false); |
4013 | InstantiateAttrsForDecl(TemplateArgLists, |
4014 | ClassTemplate->getTemplatedDecl(), Decl); |
4015 | } |
4016 | } |
4017 | |
4018 | // Diagnose uses of this specialization. |
4019 | (void)DiagnoseUseOfDecl(Decl, TemplateLoc); |
4020 | |
4021 | CanonType = Context.getTypeDeclType(Decl); |
4022 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 4023, __extension__ __PRETTY_FUNCTION__ )) |
4023 | "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\"" , "clang/lib/Sema/SemaTemplate.cpp", 4023, __extension__ __PRETTY_FUNCTION__ )); |
4024 | } else { |
4025 | llvm_unreachable("Unhandled template kind")::llvm::llvm_unreachable_internal("Unhandled template kind", "clang/lib/Sema/SemaTemplate.cpp" , 4025); |
4026 | } |
4027 | |
4028 | // Build the fully-sugared type for this class template |
4029 | // specialization, which refers back to the class template |
4030 | // specialization we created or found. |
4031 | return Context.getTemplateSpecializationType(Name, TemplateArgs.arguments(), |
4032 | CanonType); |
4033 | } |
4034 | |
4035 | void Sema::ActOnUndeclaredTypeTemplateName(Scope *S, TemplateTy &ParsedName, |
4036 | TemplateNameKind &TNK, |
4037 | SourceLocation NameLoc, |
4038 | IdentifierInfo *&II) { |
4039 | assert(TNK == TNK_Undeclared_template && "not an undeclared template name")(static_cast <bool> (TNK == TNK_Undeclared_template && "not an undeclared template name") ? void (0) : __assert_fail ("TNK == TNK_Undeclared_template && \"not an undeclared template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 4039, __extension__ __PRETTY_FUNCTION__ )); |
4040 | |
4041 | TemplateName Name = ParsedName.get(); |
4042 | auto *ATN = Name.getAsAssumedTemplateName(); |
4043 | assert(ATN && "not an assumed template name")(static_cast <bool> (ATN && "not an assumed template name" ) ? void (0) : __assert_fail ("ATN && \"not an assumed template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 4043, __extension__ __PRETTY_FUNCTION__ )); |
4044 | II = ATN->getDeclName().getAsIdentifierInfo(); |
4045 | |
4046 | if (!resolveAssumedTemplateNameAsType(S, Name, NameLoc, /*Diagnose*/false)) { |
4047 | // Resolved to a type template name. |
4048 | ParsedName = TemplateTy::make(Name); |
4049 | TNK = TNK_Type_template; |
4050 | } |
4051 | } |
4052 | |
4053 | bool Sema::resolveAssumedTemplateNameAsType(Scope *S, TemplateName &Name, |
4054 | SourceLocation NameLoc, |
4055 | bool Diagnose) { |
4056 | // We assumed this undeclared identifier to be an (ADL-only) function |
4057 | // template name, but it was used in a context where a type was required. |
4058 | // Try to typo-correct it now. |
4059 | AssumedTemplateStorage *ATN = Name.getAsAssumedTemplateName(); |
4060 | assert(ATN && "not an assumed template name")(static_cast <bool> (ATN && "not an assumed template name" ) ? void (0) : __assert_fail ("ATN && \"not an assumed template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 4060, __extension__ __PRETTY_FUNCTION__ )); |
4061 | |
4062 | LookupResult R(*this, ATN->getDeclName(), NameLoc, LookupOrdinaryName); |
4063 | struct CandidateCallback : CorrectionCandidateCallback { |
4064 | bool ValidateCandidate(const TypoCorrection &TC) override { |
4065 | return TC.getCorrectionDecl() && |
4066 | getAsTypeTemplateDecl(TC.getCorrectionDecl()); |
4067 | } |
4068 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
4069 | return std::make_unique<CandidateCallback>(*this); |
4070 | } |
4071 | } FilterCCC; |
4072 | |
4073 | TypoCorrection Corrected = |
4074 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, nullptr, |
4075 | FilterCCC, CTK_ErrorRecovery); |
4076 | if (Corrected && Corrected.getFoundDecl()) { |
4077 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) |
4078 | << ATN->getDeclName()); |
4079 | Name = TemplateName(Corrected.getCorrectionDeclAs<TemplateDecl>()); |
4080 | return false; |
4081 | } |
4082 | |
4083 | if (Diagnose) |
4084 | Diag(R.getNameLoc(), diag::err_no_template) << R.getLookupName(); |
4085 | return true; |
4086 | } |
4087 | |
4088 | TypeResult Sema::ActOnTemplateIdType( |
4089 | Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, |
4090 | TemplateTy TemplateD, IdentifierInfo *TemplateII, |
4091 | SourceLocation TemplateIILoc, SourceLocation LAngleLoc, |
4092 | ASTTemplateArgsPtr TemplateArgsIn, SourceLocation RAngleLoc, |
4093 | bool IsCtorOrDtorName, bool IsClassName, |
4094 | ImplicitTypenameContext AllowImplicitTypename) { |
4095 | if (SS.isInvalid()) |
4096 | return true; |
4097 | |
4098 | if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) { |
4099 | DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false); |
4100 | |
4101 | // C++ [temp.res]p3: |
4102 | // A qualified-id that refers to a type and in which the |
4103 | // nested-name-specifier depends on a template-parameter (14.6.2) |
4104 | // shall be prefixed by the keyword typename to indicate that the |
4105 | // qualified-id denotes a type, forming an |
4106 | // elaborated-type-specifier (7.1.5.3). |
4107 | if (!LookupCtx && isDependentScopeSpecifier(SS)) { |
4108 | // C++2a relaxes some of those restrictions in [temp.res]p5. |
4109 | if (AllowImplicitTypename == ImplicitTypenameContext::Yes) { |
4110 | if (getLangOpts().CPlusPlus20) |
4111 | Diag(SS.getBeginLoc(), diag::warn_cxx17_compat_implicit_typename); |
4112 | else |
4113 | Diag(SS.getBeginLoc(), diag::ext_implicit_typename) |
4114 | << SS.getScopeRep() << TemplateII->getName() |
4115 | << FixItHint::CreateInsertion(SS.getBeginLoc(), "typename "); |
4116 | } else |
4117 | Diag(SS.getBeginLoc(), diag::err_typename_missing_template) |
4118 | << SS.getScopeRep() << TemplateII->getName(); |
4119 | |
4120 | // FIXME: This is not quite correct recovery as we don't transform SS |
4121 | // into the corresponding dependent form (and we don't diagnose missing |
4122 | // 'template' keywords within SS as a result). |
4123 | return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc, |
4124 | TemplateD, TemplateII, TemplateIILoc, LAngleLoc, |
4125 | TemplateArgsIn, RAngleLoc); |
4126 | } |
4127 | |
4128 | // Per C++ [class.qual]p2, if the template-id was an injected-class-name, |
4129 | // it's not actually allowed to be used as a type in most cases. Because |
4130 | // we annotate it before we know whether it's valid, we have to check for |
4131 | // this case here. |
4132 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); |
4133 | if (LookupRD && LookupRD->getIdentifier() == TemplateII) { |
4134 | Diag(TemplateIILoc, |
4135 | TemplateKWLoc.isInvalid() |
4136 | ? diag::err_out_of_line_qualified_id_type_names_constructor |
4137 | : diag::ext_out_of_line_qualified_id_type_names_constructor) |
4138 | << TemplateII << 0 /*injected-class-name used as template name*/ |
4139 | << 1 /*if any keyword was present, it was 'template'*/; |
4140 | } |
4141 | } |
4142 | |
4143 | TemplateName Template = TemplateD.get(); |
4144 | if (Template.getAsAssumedTemplateName() && |
4145 | resolveAssumedTemplateNameAsType(S, Template, TemplateIILoc)) |
4146 | return true; |
4147 | |
4148 | // Translate the parser's template argument list in our AST format. |
4149 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
4150 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
4151 | |
4152 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
4153 | assert(SS.getScopeRep() == DTN->getQualifier())(static_cast <bool> (SS.getScopeRep() == DTN->getQualifier ()) ? void (0) : __assert_fail ("SS.getScopeRep() == DTN->getQualifier()" , "clang/lib/Sema/SemaTemplate.cpp", 4153, __extension__ __PRETTY_FUNCTION__ )); |
4154 | QualType T = Context.getDependentTemplateSpecializationType( |
4155 | ETK_None, DTN->getQualifier(), DTN->getIdentifier(), |
4156 | TemplateArgs.arguments()); |
4157 | // Build type-source information. |
4158 | TypeLocBuilder TLB; |
4159 | DependentTemplateSpecializationTypeLoc SpecTL |
4160 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
4161 | SpecTL.setElaboratedKeywordLoc(SourceLocation()); |
4162 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4163 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
4164 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
4165 | SpecTL.setLAngleLoc(LAngleLoc); |
4166 | SpecTL.setRAngleLoc(RAngleLoc); |
4167 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
4168 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
4169 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
4170 | } |
4171 | |
4172 | QualType SpecTy = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs); |
4173 | if (SpecTy.isNull()) |
4174 | return true; |
4175 | |
4176 | // Build type-source information. |
4177 | TypeLocBuilder TLB; |
4178 | TemplateSpecializationTypeLoc SpecTL = |
4179 | TLB.push<TemplateSpecializationTypeLoc>(SpecTy); |
4180 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
4181 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
4182 | SpecTL.setLAngleLoc(LAngleLoc); |
4183 | SpecTL.setRAngleLoc(RAngleLoc); |
4184 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
4185 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
4186 | |
4187 | // Create an elaborated-type-specifier containing the nested-name-specifier. |
4188 | QualType ElTy = getElaboratedType( |
4189 | ETK_None, !IsCtorOrDtorName ? SS : CXXScopeSpec(), SpecTy); |
4190 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(ElTy); |
4191 | ElabTL.setElaboratedKeywordLoc(SourceLocation()); |
4192 | if (!ElabTL.isEmpty()) |
4193 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4194 | return CreateParsedType(ElTy, TLB.getTypeSourceInfo(Context, ElTy)); |
4195 | } |
4196 | |
4197 | TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK, |
4198 | TypeSpecifierType TagSpec, |
4199 | SourceLocation TagLoc, |
4200 | CXXScopeSpec &SS, |
4201 | SourceLocation TemplateKWLoc, |
4202 | TemplateTy TemplateD, |
4203 | SourceLocation TemplateLoc, |
4204 | SourceLocation LAngleLoc, |
4205 | ASTTemplateArgsPtr TemplateArgsIn, |
4206 | SourceLocation RAngleLoc) { |
4207 | if (SS.isInvalid()) |
4208 | return TypeResult(true); |
4209 | |
4210 | TemplateName Template = TemplateD.get(); |
4211 | |
4212 | // Translate the parser's template argument list in our AST format. |
4213 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
4214 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
4215 | |
4216 | // Determine the tag kind |
4217 | TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
4218 | ElaboratedTypeKeyword Keyword |
4219 | = TypeWithKeyword::getKeywordForTagTypeKind(TagKind); |
4220 | |
4221 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
4222 | assert(SS.getScopeRep() == DTN->getQualifier())(static_cast <bool> (SS.getScopeRep() == DTN->getQualifier ()) ? void (0) : __assert_fail ("SS.getScopeRep() == DTN->getQualifier()" , "clang/lib/Sema/SemaTemplate.cpp", 4222, __extension__ __PRETTY_FUNCTION__ )); |
4223 | QualType T = Context.getDependentTemplateSpecializationType( |
4224 | Keyword, DTN->getQualifier(), DTN->getIdentifier(), |
4225 | TemplateArgs.arguments()); |
4226 | |
4227 | // Build type-source information. |
4228 | TypeLocBuilder TLB; |
4229 | DependentTemplateSpecializationTypeLoc SpecTL |
4230 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
4231 | SpecTL.setElaboratedKeywordLoc(TagLoc); |
4232 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4233 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
4234 | SpecTL.setTemplateNameLoc(TemplateLoc); |
4235 | SpecTL.setLAngleLoc(LAngleLoc); |
4236 | SpecTL.setRAngleLoc(RAngleLoc); |
4237 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
4238 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
4239 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
4240 | } |
4241 | |
4242 | if (TypeAliasTemplateDecl *TAT = |
4243 | dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) { |
4244 | // C++0x [dcl.type.elab]p2: |
4245 | // If the identifier resolves to a typedef-name or the simple-template-id |
4246 | // resolves to an alias template specialization, the |
4247 | // elaborated-type-specifier is ill-formed. |
4248 | Diag(TemplateLoc, diag::err_tag_reference_non_tag) |
4249 | << TAT << NTK_TypeAliasTemplate << TagKind; |
4250 | Diag(TAT->getLocation(), diag::note_declared_at); |
4251 | } |
4252 | |
4253 | QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs); |
4254 | if (Result.isNull()) |
4255 | return TypeResult(true); |
4256 | |
4257 | // Check the tag kind |
4258 | if (const RecordType *RT = Result->getAs<RecordType>()) { |
4259 | RecordDecl *D = RT->getDecl(); |
4260 | |
4261 | IdentifierInfo *Id = D->getIdentifier(); |
4262 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 4262, __extension__ __PRETTY_FUNCTION__ )); |
4263 | |
4264 | if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition, |
4265 | TagLoc, Id)) { |
4266 | Diag(TagLoc, diag::err_use_with_wrong_tag) |
4267 | << Result |
4268 | << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName()); |
4269 | Diag(D->getLocation(), diag::note_previous_use); |
4270 | } |
4271 | } |
4272 | |
4273 | // Provide source-location information for the template specialization. |
4274 | TypeLocBuilder TLB; |
4275 | TemplateSpecializationTypeLoc SpecTL |
4276 | = TLB.push<TemplateSpecializationTypeLoc>(Result); |
4277 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
4278 | SpecTL.setTemplateNameLoc(TemplateLoc); |
4279 | SpecTL.setLAngleLoc(LAngleLoc); |
4280 | SpecTL.setRAngleLoc(RAngleLoc); |
4281 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
4282 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
4283 | |
4284 | // Construct an elaborated type containing the nested-name-specifier (if any) |
4285 | // and tag keyword. |
4286 | Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result); |
4287 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); |
4288 | ElabTL.setElaboratedKeywordLoc(TagLoc); |
4289 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
4290 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
4291 | } |
4292 | |
4293 | static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized, |
4294 | NamedDecl *PrevDecl, |
4295 | SourceLocation Loc, |
4296 | bool IsPartialSpecialization); |
4297 | |
4298 | static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D); |
4299 | |
4300 | static bool isTemplateArgumentTemplateParameter( |
4301 | const TemplateArgument &Arg, unsigned Depth, unsigned Index) { |
4302 | switch (Arg.getKind()) { |
4303 | case TemplateArgument::Null: |
4304 | case TemplateArgument::NullPtr: |
4305 | case TemplateArgument::Integral: |
4306 | case TemplateArgument::Declaration: |
4307 | case TemplateArgument::Pack: |
4308 | case TemplateArgument::TemplateExpansion: |
4309 | return false; |
4310 | |
4311 | case TemplateArgument::Type: { |
4312 | QualType Type = Arg.getAsType(); |
4313 | const TemplateTypeParmType *TPT = |
4314 | Arg.getAsType()->getAs<TemplateTypeParmType>(); |
4315 | return TPT && !Type.hasQualifiers() && |
4316 | TPT->getDepth() == Depth && TPT->getIndex() == Index; |
4317 | } |
4318 | |
4319 | case TemplateArgument::Expression: { |
4320 | DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr()); |
4321 | if (!DRE || !DRE->getDecl()) |
4322 | return false; |
4323 | const NonTypeTemplateParmDecl *NTTP = |
4324 | dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); |
4325 | return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index; |
4326 | } |
4327 | |
4328 | case TemplateArgument::Template: |
4329 | const TemplateTemplateParmDecl *TTP = |
4330 | dyn_cast_or_null<TemplateTemplateParmDecl>( |
4331 | Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl()); |
4332 | return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index; |
4333 | } |
4334 | llvm_unreachable("unexpected kind of template argument")::llvm::llvm_unreachable_internal("unexpected kind of template argument" , "clang/lib/Sema/SemaTemplate.cpp", 4334); |
4335 | } |
4336 | |
4337 | static bool isSameAsPrimaryTemplate(TemplateParameterList *Params, |
4338 | ArrayRef<TemplateArgument> Args) { |
4339 | if (Params->size() != Args.size()) |
4340 | return false; |
4341 | |
4342 | unsigned Depth = Params->getDepth(); |
4343 | |
4344 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { |
4345 | TemplateArgument Arg = Args[I]; |
4346 | |
4347 | // If the parameter is a pack expansion, the argument must be a pack |
4348 | // whose only element is a pack expansion. |
4349 | if (Params->getParam(I)->isParameterPack()) { |
4350 | if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 || |
4351 | !Arg.pack_begin()->isPackExpansion()) |
4352 | return false; |
4353 | Arg = Arg.pack_begin()->getPackExpansionPattern(); |
4354 | } |
4355 | |
4356 | if (!isTemplateArgumentTemplateParameter(Arg, Depth, I)) |
4357 | return false; |
4358 | } |
4359 | |
4360 | return true; |
4361 | } |
4362 | |
4363 | template<typename PartialSpecDecl> |
4364 | static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) { |
4365 | if (Partial->getDeclContext()->isDependentContext()) |
4366 | return; |
4367 | |
4368 | // FIXME: Get the TDK from deduction in order to provide better diagnostics |
4369 | // for non-substitution-failure issues? |
4370 | TemplateDeductionInfo Info(Partial->getLocation()); |
4371 | if (S.isMoreSpecializedThanPrimary(Partial, Info)) |
4372 | return; |
4373 | |
4374 | auto *Template = Partial->getSpecializedTemplate(); |
4375 | S.Diag(Partial->getLocation(), |
4376 | diag::ext_partial_spec_not_more_specialized_than_primary) |
4377 | << isa<VarTemplateDecl>(Template); |
4378 | |
4379 | if (Info.hasSFINAEDiagnostic()) { |
4380 | PartialDiagnosticAt Diag = {SourceLocation(), |
4381 | PartialDiagnostic::NullDiagnostic()}; |
4382 | Info.takeSFINAEDiagnostic(Diag); |
4383 | SmallString<128> SFINAEArgString; |
4384 | Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString); |
4385 | S.Diag(Diag.first, |
4386 | diag::note_partial_spec_not_more_specialized_than_primary) |
4387 | << SFINAEArgString; |
4388 | } |
4389 | |
4390 | S.Diag(Template->getLocation(), diag::note_template_decl_here); |
4391 | SmallVector<const Expr *, 3> PartialAC, TemplateAC; |
4392 | Template->getAssociatedConstraints(TemplateAC); |
4393 | Partial->getAssociatedConstraints(PartialAC); |
4394 | S.MaybeEmitAmbiguousAtomicConstraintsDiagnostic(Partial, PartialAC, Template, |
4395 | TemplateAC); |
4396 | } |
4397 | |
4398 | static void |
4399 | noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams, |
4400 | const llvm::SmallBitVector &DeducibleParams) { |
4401 | for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) { |
4402 | if (!DeducibleParams[I]) { |
4403 | NamedDecl *Param = TemplateParams->getParam(I); |
4404 | if (Param->getDeclName()) |
4405 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) |
4406 | << Param->getDeclName(); |
4407 | else |
4408 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) |
4409 | << "(anonymous)"; |
4410 | } |
4411 | } |
4412 | } |
4413 | |
4414 | |
4415 | template<typename PartialSpecDecl> |
4416 | static void checkTemplatePartialSpecialization(Sema &S, |
4417 | PartialSpecDecl *Partial) { |
4418 | // C++1z [temp.class.spec]p8: (DR1495) |
4419 | // - The specialization shall be more specialized than the primary |
4420 | // template (14.5.5.2). |
4421 | checkMoreSpecializedThanPrimary(S, Partial); |
4422 | |
4423 | // C++ [temp.class.spec]p8: (DR1315) |
4424 | // - Each template-parameter shall appear at least once in the |
4425 | // template-id outside a non-deduced context. |
4426 | // C++1z [temp.class.spec.match]p3 (P0127R2) |
4427 | // If the template arguments of a partial specialization cannot be |
4428 | // deduced because of the structure of its template-parameter-list |
4429 | // and the template-id, the program is ill-formed. |
4430 | auto *TemplateParams = Partial->getTemplateParameters(); |
4431 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); |
4432 | S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true, |
4433 | TemplateParams->getDepth(), DeducibleParams); |
4434 | |
4435 | if (!DeducibleParams.all()) { |
4436 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); |
4437 | S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible) |
4438 | << isa<VarTemplatePartialSpecializationDecl>(Partial) |
4439 | << (NumNonDeducible > 1) |
4440 | << SourceRange(Partial->getLocation(), |
4441 | Partial->getTemplateArgsAsWritten()->RAngleLoc); |
4442 | noteNonDeducibleParameters(S, TemplateParams, DeducibleParams); |
4443 | } |
4444 | } |
4445 | |
4446 | void Sema::CheckTemplatePartialSpecialization( |
4447 | ClassTemplatePartialSpecializationDecl *Partial) { |
4448 | checkTemplatePartialSpecialization(*this, Partial); |
4449 | } |
4450 | |
4451 | void Sema::CheckTemplatePartialSpecialization( |
4452 | VarTemplatePartialSpecializationDecl *Partial) { |
4453 | checkTemplatePartialSpecialization(*this, Partial); |
4454 | } |
4455 | |
4456 | void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) { |
4457 | // C++1z [temp.param]p11: |
4458 | // A template parameter of a deduction guide template that does not have a |
4459 | // default-argument shall be deducible from the parameter-type-list of the |
4460 | // deduction guide template. |
4461 | auto *TemplateParams = TD->getTemplateParameters(); |
4462 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); |
4463 | MarkDeducedTemplateParameters(TD, DeducibleParams); |
4464 | for (unsigned I = 0; I != TemplateParams->size(); ++I) { |
4465 | // A parameter pack is deducible (to an empty pack). |
4466 | auto *Param = TemplateParams->getParam(I); |
4467 | if (Param->isParameterPack() || hasVisibleDefaultArgument(Param)) |
4468 | DeducibleParams[I] = true; |
4469 | } |
4470 | |
4471 | if (!DeducibleParams.all()) { |
4472 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); |
4473 | Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible) |
4474 | << (NumNonDeducible > 1); |
4475 | noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams); |
4476 | } |
4477 | } |
4478 | |
4479 | DeclResult Sema::ActOnVarTemplateSpecialization( |
4480 | Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc, |
4481 | TemplateParameterList *TemplateParams, StorageClass SC, |
4482 | bool IsPartialSpecialization) { |
4483 | // D must be variable template id. |
4484 | assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind ::IK_TemplateId && "Variable template specialization is declared with a template id." ) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template id.\"" , "clang/lib/Sema/SemaTemplate.cpp", 4485, __extension__ __PRETTY_FUNCTION__ )) |
4485 | "Variable template specialization is declared with a template id.")(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind ::IK_TemplateId && "Variable template specialization is declared with a template id." ) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template id.\"" , "clang/lib/Sema/SemaTemplate.cpp", 4485, __extension__ __PRETTY_FUNCTION__ )); |
4486 | |
4487 | TemplateIdAnnotation *TemplateId = D.getName().TemplateId; |
4488 | TemplateArgumentListInfo TemplateArgs = |
4489 | makeTemplateArgumentListInfo(*this, *TemplateId); |
4490 | SourceLocation TemplateNameLoc = D.getIdentifierLoc(); |
4491 | SourceLocation LAngleLoc = TemplateId->LAngleLoc; |
4492 | SourceLocation RAngleLoc = TemplateId->RAngleLoc; |
4493 | |
4494 | TemplateName Name = TemplateId->Template.get(); |
4495 | |
4496 | // The template-id must name a variable template. |
4497 | VarTemplateDecl *VarTemplate = |
4498 | dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl()); |
4499 | if (!VarTemplate) { |
4500 | NamedDecl *FnTemplate; |
4501 | if (auto *OTS = Name.getAsOverloadedTemplate()) |
4502 | FnTemplate = *OTS->begin(); |
4503 | else |
4504 | FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl()); |
4505 | if (FnTemplate) |
4506 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method) |
4507 | << FnTemplate->getDeclName(); |
4508 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template) |
4509 | << IsPartialSpecialization; |
4510 | } |
4511 | |
4512 | // Check for unexpanded parameter packs in any of the template arguments. |
4513 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
4514 | if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], |
4515 | UPPC_PartialSpecialization)) |
4516 | return true; |
4517 | |
4518 | // Check that the template argument list is well-formed for this |
4519 | // template. |
4520 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
4521 | if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs, |
4522 | false, SugaredConverted, CanonicalConverted, |
4523 | /*UpdateArgsWithConversions=*/true)) |
4524 | return true; |
4525 | |
4526 | // Find the variable template (partial) specialization declaration that |
4527 | // corresponds to these arguments. |
4528 | if (IsPartialSpecialization) { |
4529 | if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate, |
4530 | TemplateArgs.size(), |
4531 | CanonicalConverted)) |
4532 | return true; |
4533 | |
4534 | // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we |
4535 | // also do them during instantiation. |
4536 | if (!Name.isDependent() && |
4537 | !TemplateSpecializationType::anyDependentTemplateArguments( |
4538 | TemplateArgs, CanonicalConverted)) { |
4539 | Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) |
4540 | << VarTemplate->getDeclName(); |
4541 | IsPartialSpecialization = false; |
4542 | } |
4543 | |
4544 | if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(), |
4545 | CanonicalConverted) && |
4546 | (!Context.getLangOpts().CPlusPlus20 || |
4547 | !TemplateParams->hasAssociatedConstraints())) { |
4548 | // C++ [temp.class.spec]p9b3: |
4549 | // |
4550 | // -- The argument list of the specialization shall not be identical |
4551 | // to the implicit argument list of the primary template. |
4552 | Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) |
4553 | << /*variable template*/ 1 |
4554 | << /*is definition*/(SC != SC_Extern && !CurContext->isRecord()) |
4555 | << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); |
4556 | // FIXME: Recover from this by treating the declaration as a redeclaration |
4557 | // of the primary template. |
4558 | return true; |
4559 | } |
4560 | } |
4561 | |
4562 | void *InsertPos = nullptr; |
4563 | VarTemplateSpecializationDecl *PrevDecl = nullptr; |
4564 | |
4565 | if (IsPartialSpecialization) |
4566 | PrevDecl = VarTemplate->findPartialSpecialization( |
4567 | CanonicalConverted, TemplateParams, InsertPos); |
4568 | else |
4569 | PrevDecl = VarTemplate->findSpecialization(CanonicalConverted, InsertPos); |
4570 | |
4571 | VarTemplateSpecializationDecl *Specialization = nullptr; |
4572 | |
4573 | // Check whether we can declare a variable template specialization in |
4574 | // the current scope. |
4575 | if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl, |
4576 | TemplateNameLoc, |
4577 | IsPartialSpecialization)) |
4578 | return true; |
4579 | |
4580 | if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) { |
4581 | // Since the only prior variable template specialization with these |
4582 | // arguments was referenced but not declared, reuse that |
4583 | // declaration node as our own, updating its source location and |
4584 | // the list of outer template parameters to reflect our new declaration. |
4585 | Specialization = PrevDecl; |
4586 | Specialization->setLocation(TemplateNameLoc); |
4587 | PrevDecl = nullptr; |
4588 | } else if (IsPartialSpecialization) { |
4589 | // Create a new class template partial specialization declaration node. |
4590 | VarTemplatePartialSpecializationDecl *PrevPartial = |
4591 | cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl); |
4592 | VarTemplatePartialSpecializationDecl *Partial = |
4593 | VarTemplatePartialSpecializationDecl::Create( |
4594 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, |
4595 | TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC, |
4596 | CanonicalConverted, TemplateArgs); |
4597 | |
4598 | if (!PrevPartial) |
4599 | VarTemplate->AddPartialSpecialization(Partial, InsertPos); |
4600 | Specialization = Partial; |
4601 | |
4602 | // If we are providing an explicit specialization of a member variable |
4603 | // template specialization, make a note of that. |
4604 | if (PrevPartial && PrevPartial->getInstantiatedFromMember()) |
4605 | PrevPartial->setMemberSpecialization(); |
4606 | |
4607 | CheckTemplatePartialSpecialization(Partial); |
4608 | } else { |
4609 | // Create a new class template specialization declaration node for |
4610 | // this explicit specialization or friend declaration. |
4611 | Specialization = VarTemplateSpecializationDecl::Create( |
4612 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc, |
4613 | VarTemplate, DI->getType(), DI, SC, CanonicalConverted); |
4614 | Specialization->setTemplateArgsInfo(TemplateArgs); |
4615 | |
4616 | if (!PrevDecl) |
4617 | VarTemplate->AddSpecialization(Specialization, InsertPos); |
4618 | } |
4619 | |
4620 | // C++ [temp.expl.spec]p6: |
4621 | // If a template, a member template or the member of a class template is |
4622 | // explicitly specialized then that specialization shall be declared |
4623 | // before the first use of that specialization that would cause an implicit |
4624 | // instantiation to take place, in every translation unit in which such a |
4625 | // use occurs; no diagnostic is required. |
4626 | if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { |
4627 | bool Okay = false; |
4628 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
4629 | // Is there any previous explicit specialization declaration? |
4630 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
4631 | Okay = true; |
4632 | break; |
4633 | } |
4634 | } |
4635 | |
4636 | if (!Okay) { |
4637 | SourceRange Range(TemplateNameLoc, RAngleLoc); |
4638 | Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) |
4639 | << Name << Range; |
4640 | |
4641 | Diag(PrevDecl->getPointOfInstantiation(), |
4642 | diag::note_instantiation_required_here) |
4643 | << (PrevDecl->getTemplateSpecializationKind() != |
4644 | TSK_ImplicitInstantiation); |
4645 | return true; |
4646 | } |
4647 | } |
4648 | |
4649 | Specialization->setTemplateKeywordLoc(TemplateKWLoc); |
4650 | Specialization->setLexicalDeclContext(CurContext); |
4651 | |
4652 | // Add the specialization into its lexical context, so that it can |
4653 | // be seen when iterating through the list of declarations in that |
4654 | // context. However, specializations are not found by name lookup. |
4655 | CurContext->addDecl(Specialization); |
4656 | |
4657 | // Note that this is an explicit specialization. |
4658 | Specialization->setSpecializationKind(TSK_ExplicitSpecialization); |
4659 | |
4660 | if (PrevDecl) { |
4661 | // Check that this isn't a redefinition of this specialization, |
4662 | // merging with previous declarations. |
4663 | LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName, |
4664 | forRedeclarationInCurContext()); |
4665 | PrevSpec.addDecl(PrevDecl); |
4666 | D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec)); |
4667 | } else if (Specialization->isStaticDataMember() && |
4668 | Specialization->isOutOfLine()) { |
4669 | Specialization->setAccess(VarTemplate->getAccess()); |
4670 | } |
4671 | |
4672 | return Specialization; |
4673 | } |
4674 | |
4675 | namespace { |
4676 | /// A partial specialization whose template arguments have matched |
4677 | /// a given template-id. |
4678 | struct PartialSpecMatchResult { |
4679 | VarTemplatePartialSpecializationDecl *Partial; |
4680 | TemplateArgumentList *Args; |
4681 | }; |
4682 | } // end anonymous namespace |
4683 | |
4684 | DeclResult |
4685 | Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc, |
4686 | SourceLocation TemplateNameLoc, |
4687 | const TemplateArgumentListInfo &TemplateArgs) { |
4688 | 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?\"" , "clang/lib/Sema/SemaTemplate.cpp", 4688, __extension__ __PRETTY_FUNCTION__ )); |
4689 | |
4690 | // Check that the template argument list is well-formed for this template. |
4691 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
4692 | if (CheckTemplateArgumentList( |
4693 | Template, TemplateNameLoc, |
4694 | const_cast<TemplateArgumentListInfo &>(TemplateArgs), false, |
4695 | SugaredConverted, CanonicalConverted, |
4696 | /*UpdateArgsWithConversions=*/true)) |
4697 | return true; |
4698 | |
4699 | // Produce a placeholder value if the specialization is dependent. |
4700 | if (Template->getDeclContext()->isDependentContext() || |
4701 | TemplateSpecializationType::anyDependentTemplateArguments( |
4702 | TemplateArgs, CanonicalConverted)) |
4703 | return DeclResult(); |
4704 | |
4705 | // Find the variable template specialization declaration that |
4706 | // corresponds to these arguments. |
4707 | void *InsertPos = nullptr; |
4708 | if (VarTemplateSpecializationDecl *Spec = |
4709 | Template->findSpecialization(CanonicalConverted, InsertPos)) { |
4710 | checkSpecializationReachability(TemplateNameLoc, Spec); |
4711 | // If we already have a variable template specialization, return it. |
4712 | return Spec; |
4713 | } |
4714 | |
4715 | // This is the first time we have referenced this variable template |
4716 | // specialization. Create the canonical declaration and add it to |
4717 | // the set of specializations, based on the closest partial specialization |
4718 | // that it represents. That is, |
4719 | VarDecl *InstantiationPattern = Template->getTemplatedDecl(); |
4720 | TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack, |
4721 | CanonicalConverted); |
4722 | TemplateArgumentList *InstantiationArgs = &TemplateArgList; |
4723 | bool AmbiguousPartialSpec = false; |
4724 | typedef PartialSpecMatchResult MatchResult; |
4725 | SmallVector<MatchResult, 4> Matched; |
4726 | SourceLocation PointOfInstantiation = TemplateNameLoc; |
4727 | TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation, |
4728 | /*ForTakingAddress=*/false); |
4729 | |
4730 | // 1. Attempt to find the closest partial specialization that this |
4731 | // specializes, if any. |
4732 | // TODO: Unify with InstantiateClassTemplateSpecialization()? |
4733 | // Perhaps better after unification of DeduceTemplateArguments() and |
4734 | // getMoreSpecializedPartialSpecialization(). |
4735 | SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs; |
4736 | Template->getPartialSpecializations(PartialSpecs); |
4737 | |
4738 | for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { |
4739 | VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; |
4740 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); |
4741 | |
4742 | if (TemplateDeductionResult Result = |
4743 | DeduceTemplateArguments(Partial, TemplateArgList, Info)) { |
4744 | // Store the failed-deduction information for use in diagnostics, later. |
4745 | // TODO: Actually use the failed-deduction info? |
4746 | FailedCandidates.addCandidate().set( |
4747 | DeclAccessPair::make(Template, AS_public), Partial, |
4748 | MakeDeductionFailureInfo(Context, Result, Info)); |
4749 | (void)Result; |
4750 | } else { |
4751 | Matched.push_back(PartialSpecMatchResult()); |
4752 | Matched.back().Partial = Partial; |
4753 | Matched.back().Args = Info.takeCanonical(); |
4754 | } |
4755 | } |
4756 | |
4757 | if (Matched.size() >= 1) { |
4758 | SmallVector<MatchResult, 4>::iterator Best = Matched.begin(); |
4759 | if (Matched.size() == 1) { |
4760 | // -- If exactly one matching specialization is found, the |
4761 | // instantiation is generated from that specialization. |
4762 | // We don't need to do anything for this. |
4763 | } else { |
4764 | // -- If more than one matching specialization is found, the |
4765 | // partial order rules (14.5.4.2) are used to determine |
4766 | // whether one of the specializations is more specialized |
4767 | // than the others. If none of the specializations is more |
4768 | // specialized than all of the other matching |
4769 | // specializations, then the use of the variable template is |
4770 | // ambiguous and the program is ill-formed. |
4771 | for (SmallVector<MatchResult, 4>::iterator P = Best + 1, |
4772 | PEnd = Matched.end(); |
4773 | P != PEnd; ++P) { |
4774 | if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial, |
4775 | PointOfInstantiation) == |
4776 | P->Partial) |
4777 | Best = P; |
4778 | } |
4779 | |
4780 | // Determine if the best partial specialization is more specialized than |
4781 | // the others. |
4782 | for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(), |
4783 | PEnd = Matched.end(); |
4784 | P != PEnd; ++P) { |
4785 | if (P != Best && getMoreSpecializedPartialSpecialization( |
4786 | P->Partial, Best->Partial, |
4787 | PointOfInstantiation) != Best->Partial) { |
4788 | AmbiguousPartialSpec = true; |
4789 | break; |
4790 | } |
4791 | } |
4792 | } |
4793 | |
4794 | // Instantiate using the best variable template partial specialization. |
4795 | InstantiationPattern = Best->Partial; |
4796 | InstantiationArgs = Best->Args; |
4797 | } else { |
4798 | // -- If no match is found, the instantiation is generated |
4799 | // from the primary template. |
4800 | // InstantiationPattern = Template->getTemplatedDecl(); |
4801 | } |
4802 | |
4803 | // 2. Create the canonical declaration. |
4804 | // Note that we do not instantiate a definition until we see an odr-use |
4805 | // in DoMarkVarDeclReferenced(). |
4806 | // FIXME: LateAttrs et al.? |
4807 | VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation( |
4808 | Template, InstantiationPattern, *InstantiationArgs, TemplateArgs, |
4809 | CanonicalConverted, TemplateNameLoc /*, LateAttrs, StartingScope*/); |
4810 | if (!Decl) |
4811 | return true; |
4812 | |
4813 | if (AmbiguousPartialSpec) { |
4814 | // Partial ordering did not produce a clear winner. Complain. |
4815 | Decl->setInvalidDecl(); |
4816 | Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous) |
4817 | << Decl; |
4818 | |
4819 | // Print the matching partial specializations. |
4820 | for (MatchResult P : Matched) |
4821 | Diag(P.Partial->getLocation(), diag::note_partial_spec_match) |
4822 | << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(), |
4823 | *P.Args); |
4824 | return true; |
4825 | } |
4826 | |
4827 | if (VarTemplatePartialSpecializationDecl *D = |
4828 | dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern)) |
4829 | Decl->setInstantiationOf(D, InstantiationArgs); |
4830 | |
4831 | checkSpecializationReachability(TemplateNameLoc, Decl); |
4832 | |
4833 | assert(Decl && "No variable template specialization?")(static_cast <bool> (Decl && "No variable template specialization?" ) ? void (0) : __assert_fail ("Decl && \"No variable template specialization?\"" , "clang/lib/Sema/SemaTemplate.cpp", 4833, __extension__ __PRETTY_FUNCTION__ )); |
4834 | return Decl; |
4835 | } |
4836 | |
4837 | ExprResult |
4838 | Sema::CheckVarTemplateId(const CXXScopeSpec &SS, |
4839 | const DeclarationNameInfo &NameInfo, |
4840 | VarTemplateDecl *Template, SourceLocation TemplateLoc, |
4841 | const TemplateArgumentListInfo *TemplateArgs) { |
4842 | |
4843 | DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(), |
4844 | *TemplateArgs); |
4845 | if (Decl.isInvalid()) |
4846 | return ExprError(); |
4847 | |
4848 | if (!Decl.get()) |
4849 | return ExprResult(); |
4850 | |
4851 | VarDecl *Var = cast<VarDecl>(Decl.get()); |
4852 | if (!Var->getTemplateSpecializationKind()) |
4853 | Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation, |
4854 | NameInfo.getLoc()); |
4855 | |
4856 | // Build an ordinary singleton decl ref. |
4857 | return BuildDeclarationNameExpr(SS, NameInfo, Var, |
4858 | /*FoundD=*/nullptr, TemplateArgs); |
4859 | } |
4860 | |
4861 | void Sema::diagnoseMissingTemplateArguments(TemplateName Name, |
4862 | SourceLocation Loc) { |
4863 | Diag(Loc, diag::err_template_missing_args) |
4864 | << (int)getTemplateNameKindForDiagnostics(Name) << Name; |
4865 | if (TemplateDecl *TD = Name.getAsTemplateDecl()) { |
4866 | Diag(TD->getLocation(), diag::note_template_decl_here) |
4867 | << TD->getTemplateParameters()->getSourceRange(); |
4868 | } |
4869 | } |
4870 | |
4871 | ExprResult |
4872 | Sema::CheckConceptTemplateId(const CXXScopeSpec &SS, |
4873 | SourceLocation TemplateKWLoc, |
4874 | const DeclarationNameInfo &ConceptNameInfo, |
4875 | NamedDecl *FoundDecl, |
4876 | ConceptDecl *NamedConcept, |
4877 | const TemplateArgumentListInfo *TemplateArgs) { |
4878 | assert(NamedConcept && "A concept template id without a template?")(static_cast <bool> (NamedConcept && "A concept template id without a template?" ) ? void (0) : __assert_fail ("NamedConcept && \"A concept template id without a template?\"" , "clang/lib/Sema/SemaTemplate.cpp", 4878, __extension__ __PRETTY_FUNCTION__ )); |
4879 | |
4880 | llvm::SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
4881 | if (CheckTemplateArgumentList( |
4882 | NamedConcept, ConceptNameInfo.getLoc(), |
4883 | const_cast<TemplateArgumentListInfo &>(*TemplateArgs), |
4884 | /*PartialTemplateArgs=*/false, SugaredConverted, CanonicalConverted, |
4885 | /*UpdateArgsWithConversions=*/false)) |
4886 | return ExprError(); |
4887 | |
4888 | auto *CSD = ImplicitConceptSpecializationDecl::Create( |
4889 | Context, NamedConcept->getDeclContext(), NamedConcept->getLocation(), |
4890 | CanonicalConverted); |
4891 | ConstraintSatisfaction Satisfaction; |
4892 | bool AreArgsDependent = |
4893 | TemplateSpecializationType::anyDependentTemplateArguments( |
4894 | *TemplateArgs, CanonicalConverted); |
4895 | MultiLevelTemplateArgumentList MLTAL(NamedConcept, CanonicalConverted, |
4896 | /*Final=*/false); |
4897 | LocalInstantiationScope Scope(*this); |
4898 | |
4899 | EnterExpressionEvaluationContext EECtx{ |
4900 | *this, ExpressionEvaluationContext::ConstantEvaluated, CSD}; |
4901 | |
4902 | if (!AreArgsDependent && |
4903 | CheckConstraintSatisfaction( |
4904 | NamedConcept, {NamedConcept->getConstraintExpr()}, MLTAL, |
4905 | SourceRange(SS.isSet() ? SS.getBeginLoc() : ConceptNameInfo.getLoc(), |
4906 | TemplateArgs->getRAngleLoc()), |
4907 | Satisfaction)) |
4908 | return ExprError(); |
4909 | |
4910 | return ConceptSpecializationExpr::Create( |
4911 | Context, |
4912 | SS.isSet() ? SS.getWithLocInContext(Context) : NestedNameSpecifierLoc{}, |
4913 | TemplateKWLoc, ConceptNameInfo, FoundDecl, NamedConcept, |
4914 | ASTTemplateArgumentListInfo::Create(Context, *TemplateArgs), CSD, |
4915 | AreArgsDependent ? nullptr : &Satisfaction); |
4916 | } |
4917 | |
4918 | ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS, |
4919 | SourceLocation TemplateKWLoc, |
4920 | LookupResult &R, |
4921 | bool RequiresADL, |
4922 | const TemplateArgumentListInfo *TemplateArgs) { |
4923 | // FIXME: Can we do any checking at this point? I guess we could check the |
4924 | // template arguments that we have against the template name, if the template |
4925 | // name refers to a single template. That's not a terribly common case, |
4926 | // though. |
4927 | // foo<int> could identify a single function unambiguously |
4928 | // This approach does NOT work, since f<int>(1); |
4929 | // gets resolved prior to resorting to overload resolution |
4930 | // i.e., template<class T> void f(double); |
4931 | // vs template<class T, class U> void f(U); |
4932 | |
4933 | // These should be filtered out by our callers. |
4934 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 4934, __extension__ __PRETTY_FUNCTION__ )); |
4935 | |
4936 | // Non-function templates require a template argument list. |
4937 | if (auto *TD = R.getAsSingle<TemplateDecl>()) { |
4938 | if (!TemplateArgs && !isa<FunctionTemplateDecl>(TD)) { |
4939 | diagnoseMissingTemplateArguments(TemplateName(TD), R.getNameLoc()); |
4940 | return ExprError(); |
4941 | } |
4942 | } |
4943 | |
4944 | // In C++1y, check variable template ids. |
4945 | if (R.getAsSingle<VarTemplateDecl>()) { |
4946 | ExprResult Res = CheckVarTemplateId(SS, R.getLookupNameInfo(), |
4947 | R.getAsSingle<VarTemplateDecl>(), |
4948 | TemplateKWLoc, TemplateArgs); |
4949 | if (Res.isInvalid() || Res.isUsable()) |
4950 | return Res; |
4951 | // Result is dependent. Carry on to build an UnresolvedLookupEpxr. |
4952 | } |
4953 | |
4954 | if (R.getAsSingle<ConceptDecl>()) { |
4955 | return CheckConceptTemplateId(SS, TemplateKWLoc, R.getLookupNameInfo(), |
4956 | R.getFoundDecl(), |
4957 | R.getAsSingle<ConceptDecl>(), TemplateArgs); |
4958 | } |
4959 | |
4960 | // We don't want lookup warnings at this point. |
4961 | R.suppressDiagnostics(); |
4962 | |
4963 | UnresolvedLookupExpr *ULE |
4964 | = UnresolvedLookupExpr::Create(Context, R.getNamingClass(), |
4965 | SS.getWithLocInContext(Context), |
4966 | TemplateKWLoc, |
4967 | R.getLookupNameInfo(), |
4968 | RequiresADL, TemplateArgs, |
4969 | R.begin(), R.end()); |
4970 | |
4971 | return ULE; |
4972 | } |
4973 | |
4974 | // We actually only call this from template instantiation. |
4975 | ExprResult |
4976 | Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS, |
4977 | SourceLocation TemplateKWLoc, |
4978 | const DeclarationNameInfo &NameInfo, |
4979 | const TemplateArgumentListInfo *TemplateArgs) { |
4980 | |
4981 | assert(TemplateArgs || TemplateKWLoc.isValid())(static_cast <bool> (TemplateArgs || TemplateKWLoc.isValid ()) ? void (0) : __assert_fail ("TemplateArgs || TemplateKWLoc.isValid()" , "clang/lib/Sema/SemaTemplate.cpp", 4981, __extension__ __PRETTY_FUNCTION__ )); |
4982 | DeclContext *DC; |
4983 | if (!(DC = computeDeclContext(SS, false)) || |
4984 | DC->isDependentContext() || |
4985 | RequireCompleteDeclContext(SS, DC)) |
4986 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); |
4987 | |
4988 | bool MemberOfUnknownSpecialization; |
4989 | LookupResult R(*this, NameInfo, LookupOrdinaryName); |
4990 | if (LookupTemplateName(R, (Scope *)nullptr, SS, QualType(), |
4991 | /*Entering*/false, MemberOfUnknownSpecialization, |
4992 | TemplateKWLoc)) |
4993 | return ExprError(); |
4994 | |
4995 | if (R.isAmbiguous()) |
4996 | return ExprError(); |
4997 | |
4998 | if (R.empty()) { |
4999 | Diag(NameInfo.getLoc(), diag::err_no_member) |
5000 | << NameInfo.getName() << DC << SS.getRange(); |
5001 | return ExprError(); |
5002 | } |
5003 | |
5004 | if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) { |
5005 | Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template) |
5006 | << SS.getScopeRep() |
5007 | << NameInfo.getName().getAsString() << SS.getRange(); |
5008 | Diag(Temp->getLocation(), diag::note_referenced_class_template); |
5009 | return ExprError(); |
5010 | } |
5011 | |
5012 | return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs); |
5013 | } |
5014 | |
5015 | /// Form a template name from a name that is syntactically required to name a |
5016 | /// template, either due to use of the 'template' keyword or because a name in |
5017 | /// this syntactic context is assumed to name a template (C++ [temp.names]p2-4). |
5018 | /// |
5019 | /// This action forms a template name given the name of the template and its |
5020 | /// optional scope specifier. This is used when the 'template' keyword is used |
5021 | /// or when the parsing context unambiguously treats a following '<' as |
5022 | /// introducing a template argument list. Note that this may produce a |
5023 | /// non-dependent template name if we can perform the lookup now and identify |
5024 | /// the named template. |
5025 | /// |
5026 | /// For example, given "x.MetaFun::template apply", the scope specifier |
5027 | /// \p SS will be "MetaFun::", \p TemplateKWLoc contains the location |
5028 | /// of the "template" keyword, and "apply" is the \p Name. |
5029 | TemplateNameKind Sema::ActOnTemplateName(Scope *S, |
5030 | CXXScopeSpec &SS, |
5031 | SourceLocation TemplateKWLoc, |
5032 | const UnqualifiedId &Name, |
5033 | ParsedType ObjectType, |
5034 | bool EnteringContext, |
5035 | TemplateTy &Result, |
5036 | bool AllowInjectedClassName) { |
5037 | if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent()) |
5038 | Diag(TemplateKWLoc, |
5039 | getLangOpts().CPlusPlus11 ? |
5040 | diag::warn_cxx98_compat_template_outside_of_template : |
5041 | diag::ext_template_outside_of_template) |
5042 | << FixItHint::CreateRemoval(TemplateKWLoc); |
5043 | |
5044 | if (SS.isInvalid()) |
5045 | return TNK_Non_template; |
5046 | |
5047 | // Figure out where isTemplateName is going to look. |
5048 | DeclContext *LookupCtx = nullptr; |
5049 | if (SS.isNotEmpty()) |
5050 | LookupCtx = computeDeclContext(SS, EnteringContext); |
5051 | else if (ObjectType) |
5052 | LookupCtx = computeDeclContext(GetTypeFromParser(ObjectType)); |
5053 | |
5054 | // C++0x [temp.names]p5: |
5055 | // If a name prefixed by the keyword template is not the name of |
5056 | // a template, the program is ill-formed. [Note: the keyword |
5057 | // template may not be applied to non-template members of class |
5058 | // templates. -end note ] [ Note: as is the case with the |
5059 | // typename prefix, the template prefix is allowed in cases |
5060 | // where it is not strictly necessary; i.e., when the |
5061 | // nested-name-specifier or the expression on the left of the -> |
5062 | // or . is not dependent on a template-parameter, or the use |
5063 | // does not appear in the scope of a template. -end note] |
5064 | // |
5065 | // Note: C++03 was more strict here, because it banned the use of |
5066 | // the "template" keyword prior to a template-name that was not a |
5067 | // dependent name. C++ DR468 relaxed this requirement (the |
5068 | // "template" keyword is now permitted). We follow the C++0x |
5069 | // rules, even in C++03 mode with a warning, retroactively applying the DR. |
5070 | bool MemberOfUnknownSpecialization; |
5071 | TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name, |
5072 | ObjectType, EnteringContext, Result, |
5073 | MemberOfUnknownSpecialization); |
5074 | if (TNK != TNK_Non_template) { |
5075 | // We resolved this to a (non-dependent) template name. Return it. |
5076 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); |
5077 | if (!AllowInjectedClassName && SS.isNotEmpty() && LookupRD && |
5078 | Name.getKind() == UnqualifiedIdKind::IK_Identifier && |
5079 | Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) { |
5080 | // C++14 [class.qual]p2: |
5081 | // In a lookup in which function names are not ignored and the |
5082 | // nested-name-specifier nominates a class C, if the name specified |
5083 | // [...] is the injected-class-name of C, [...] the name is instead |
5084 | // considered to name the constructor |
5085 | // |
5086 | // We don't get here if naming the constructor would be valid, so we |
5087 | // just reject immediately and recover by treating the |
5088 | // injected-class-name as naming the template. |
5089 | Diag(Name.getBeginLoc(), |
5090 | diag::ext_out_of_line_qualified_id_type_names_constructor) |
5091 | << Name.Identifier |
5092 | << 0 /*injected-class-name used as template name*/ |
5093 | << TemplateKWLoc.isValid(); |
5094 | } |
5095 | return TNK; |
5096 | } |
5097 | |
5098 | if (!MemberOfUnknownSpecialization) { |
5099 | // Didn't find a template name, and the lookup wasn't dependent. |
5100 | // Do the lookup again to determine if this is a "nothing found" case or |
5101 | // a "not a template" case. FIXME: Refactor isTemplateName so we don't |
5102 | // need to do this. |
5103 | DeclarationNameInfo DNI = GetNameFromUnqualifiedId(Name); |
5104 | LookupResult R(*this, DNI.getName(), Name.getBeginLoc(), |
5105 | LookupOrdinaryName); |
5106 | bool MOUS; |
5107 | // Tell LookupTemplateName that we require a template so that it diagnoses |
5108 | // cases where it finds a non-template. |
5109 | RequiredTemplateKind RTK = TemplateKWLoc.isValid() |
5110 | ? RequiredTemplateKind(TemplateKWLoc) |
5111 | : TemplateNameIsRequired; |
5112 | if (!LookupTemplateName(R, S, SS, ObjectType.get(), EnteringContext, MOUS, |
5113 | RTK, nullptr, /*AllowTypoCorrection=*/false) && |
5114 | !R.isAmbiguous()) { |
5115 | if (LookupCtx) |
5116 | Diag(Name.getBeginLoc(), diag::err_no_member) |
5117 | << DNI.getName() << LookupCtx << SS.getRange(); |
5118 | else |
5119 | Diag(Name.getBeginLoc(), diag::err_undeclared_use) |
5120 | << DNI.getName() << SS.getRange(); |
5121 | } |
5122 | return TNK_Non_template; |
5123 | } |
5124 | |
5125 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); |
5126 | |
5127 | switch (Name.getKind()) { |
5128 | case UnqualifiedIdKind::IK_Identifier: |
5129 | Result = TemplateTy::make( |
5130 | Context.getDependentTemplateName(Qualifier, Name.Identifier)); |
5131 | return TNK_Dependent_template_name; |
5132 | |
5133 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
5134 | Result = TemplateTy::make(Context.getDependentTemplateName( |
5135 | Qualifier, Name.OperatorFunctionId.Operator)); |
5136 | return TNK_Function_template; |
5137 | |
5138 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
5139 | // This is a kind of template name, but can never occur in a dependent |
5140 | // scope (literal operators can only be declared at namespace scope). |
5141 | break; |
5142 | |
5143 | default: |
5144 | break; |
5145 | } |
5146 | |
5147 | // This name cannot possibly name a dependent template. Diagnose this now |
5148 | // rather than building a dependent template name that can never be valid. |
5149 | Diag(Name.getBeginLoc(), |
5150 | diag::err_template_kw_refers_to_dependent_non_template) |
5151 | << GetNameFromUnqualifiedId(Name).getName() << Name.getSourceRange() |
5152 | << TemplateKWLoc.isValid() << TemplateKWLoc; |
5153 | return TNK_Non_template; |
5154 | } |
5155 | |
5156 | bool Sema::CheckTemplateTypeArgument( |
5157 | TemplateTypeParmDecl *Param, TemplateArgumentLoc &AL, |
5158 | SmallVectorImpl<TemplateArgument> &SugaredConverted, |
5159 | SmallVectorImpl<TemplateArgument> &CanonicalConverted) { |
5160 | const TemplateArgument &Arg = AL.getArgument(); |
5161 | QualType ArgType; |
5162 | TypeSourceInfo *TSI = nullptr; |
5163 | |
5164 | // Check template type parameter. |
5165 | switch(Arg.getKind()) { |
5166 | case TemplateArgument::Type: |
5167 | // C++ [temp.arg.type]p1: |
5168 | // A template-argument for a template-parameter which is a |
5169 | // type shall be a type-id. |
5170 | ArgType = Arg.getAsType(); |
5171 | TSI = AL.getTypeSourceInfo(); |
5172 | break; |
5173 | case TemplateArgument::Template: |
5174 | case TemplateArgument::TemplateExpansion: { |
5175 | // We have a template type parameter but the template argument |
5176 | // is a template without any arguments. |
5177 | SourceRange SR = AL.getSourceRange(); |
5178 | TemplateName Name = Arg.getAsTemplateOrTemplatePattern(); |
5179 | diagnoseMissingTemplateArguments(Name, SR.getEnd()); |
5180 | return true; |
5181 | } |
5182 | case TemplateArgument::Expression: { |
5183 | // We have a template type parameter but the template argument is an |
5184 | // expression; see if maybe it is missing the "typename" keyword. |
5185 | CXXScopeSpec SS; |
5186 | DeclarationNameInfo NameInfo; |
5187 | |
5188 | if (DependentScopeDeclRefExpr *ArgExpr = |
5189 | dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) { |
5190 | SS.Adopt(ArgExpr->getQualifierLoc()); |
5191 | NameInfo = ArgExpr->getNameInfo(); |
5192 | } else if (CXXDependentScopeMemberExpr *ArgExpr = |
5193 | dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) { |
5194 | if (ArgExpr->isImplicitAccess()) { |
5195 | SS.Adopt(ArgExpr->getQualifierLoc()); |
5196 | NameInfo = ArgExpr->getMemberNameInfo(); |
5197 | } |
5198 | } |
5199 | |
5200 | if (auto *II = NameInfo.getName().getAsIdentifierInfo()) { |
5201 | LookupResult Result(*this, NameInfo, LookupOrdinaryName); |
5202 | LookupParsedName(Result, CurScope, &SS); |
5203 | |
5204 | if (Result.getAsSingle<TypeDecl>() || |
5205 | Result.getResultKind() == |
5206 | LookupResult::NotFoundInCurrentInstantiation) { |
5207 | assert(SS.getScopeRep() && "dependent scope expr must has a scope!")(static_cast <bool> (SS.getScopeRep() && "dependent scope expr must has a scope!" ) ? void (0) : __assert_fail ("SS.getScopeRep() && \"dependent scope expr must has a scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 5207, __extension__ __PRETTY_FUNCTION__ )); |
5208 | // Suggest that the user add 'typename' before the NNS. |
5209 | SourceLocation Loc = AL.getSourceRange().getBegin(); |
5210 | Diag(Loc, getLangOpts().MSVCCompat |
5211 | ? diag::ext_ms_template_type_arg_missing_typename |
5212 | : diag::err_template_arg_must_be_type_suggest) |
5213 | << FixItHint::CreateInsertion(Loc, "typename "); |
5214 | Diag(Param->getLocation(), diag::note_template_param_here); |
5215 | |
5216 | // Recover by synthesizing a type using the location information that we |
5217 | // already have. |
5218 | ArgType = |
5219 | Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II); |
5220 | TypeLocBuilder TLB; |
5221 | DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType); |
5222 | TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/)); |
5223 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
5224 | TL.setNameLoc(NameInfo.getLoc()); |
5225 | TSI = TLB.getTypeSourceInfo(Context, ArgType); |
5226 | |
5227 | // Overwrite our input TemplateArgumentLoc so that we can recover |
5228 | // properly. |
5229 | AL = TemplateArgumentLoc(TemplateArgument(ArgType), |
5230 | TemplateArgumentLocInfo(TSI)); |
5231 | |
5232 | break; |
5233 | } |
5234 | } |
5235 | // fallthrough |
5236 | [[fallthrough]]; |
5237 | } |
5238 | default: { |
5239 | // We have a template type parameter but the template argument |
5240 | // is not a type. |
5241 | SourceRange SR = AL.getSourceRange(); |
5242 | Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR; |
5243 | Diag(Param->getLocation(), diag::note_template_param_here); |
5244 | |
5245 | return true; |
5246 | } |
5247 | } |
5248 | |
5249 | if (CheckTemplateArgument(TSI)) |
5250 | return true; |
5251 | |
5252 | // Objective-C ARC: |
5253 | // If an explicitly-specified template argument type is a lifetime type |
5254 | // with no lifetime qualifier, the __strong lifetime qualifier is inferred. |
5255 | if (getLangOpts().ObjCAutoRefCount && |
5256 | ArgType->isObjCLifetimeType() && |
5257 | !ArgType.getObjCLifetime()) { |
5258 | Qualifiers Qs; |
5259 | Qs.setObjCLifetime(Qualifiers::OCL_Strong); |
5260 | ArgType = Context.getQualifiedType(ArgType, Qs); |
5261 | } |
5262 | |
5263 | SugaredConverted.push_back(TemplateArgument(ArgType)); |
5264 | CanonicalConverted.push_back( |
5265 | TemplateArgument(Context.getCanonicalType(ArgType))); |
5266 | return false; |
5267 | } |
5268 | |
5269 | /// Substitute template arguments into the default template argument for |
5270 | /// the given template type parameter. |
5271 | /// |
5272 | /// \param SemaRef the semantic analysis object for which we are performing |
5273 | /// the substitution. |
5274 | /// |
5275 | /// \param Template the template that we are synthesizing template arguments |
5276 | /// for. |
5277 | /// |
5278 | /// \param TemplateLoc the location of the template name that started the |
5279 | /// template-id we are checking. |
5280 | /// |
5281 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
5282 | /// terminates the template-id. |
5283 | /// |
5284 | /// \param Param the template template parameter whose default we are |
5285 | /// substituting into. |
5286 | /// |
5287 | /// \param Converted the list of template arguments provided for template |
5288 | /// parameters that precede \p Param in the template parameter list. |
5289 | /// \returns the substituted template argument, or NULL if an error occurred. |
5290 | static TypeSourceInfo *SubstDefaultTemplateArgument( |
5291 | Sema &SemaRef, TemplateDecl *Template, SourceLocation TemplateLoc, |
5292 | SourceLocation RAngleLoc, TemplateTypeParmDecl *Param, |
5293 | ArrayRef<TemplateArgument> SugaredConverted, |
5294 | ArrayRef<TemplateArgument> CanonicalConverted) { |
5295 | TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo(); |
5296 | |
5297 | // If the argument type is dependent, instantiate it now based |
5298 | // on the previously-computed template arguments. |
5299 | if (ArgType->getType()->isInstantiationDependentType()) { |
5300 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, Param, Template, |
5301 | SugaredConverted, |
5302 | SourceRange(TemplateLoc, RAngleLoc)); |
5303 | if (Inst.isInvalid()) |
5304 | return nullptr; |
5305 | |
5306 | // Only substitute for the innermost template argument list. |
5307 | MultiLevelTemplateArgumentList TemplateArgLists(Template, SugaredConverted, |
5308 | /*Final=*/true); |
5309 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
5310 | TemplateArgLists.addOuterTemplateArguments(std::nullopt); |
5311 | |
5312 | bool ForLambdaCallOperator = false; |
5313 | if (const auto *Rec = dyn_cast<CXXRecordDecl>(Template->getDeclContext())) |
5314 | ForLambdaCallOperator = Rec->isLambda(); |
5315 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext(), |
5316 | !ForLambdaCallOperator); |
5317 | ArgType = |
5318 | SemaRef.SubstType(ArgType, TemplateArgLists, |
5319 | Param->getDefaultArgumentLoc(), Param->getDeclName()); |
5320 | } |
5321 | |
5322 | return ArgType; |
5323 | } |
5324 | |
5325 | /// Substitute template arguments into the default template argument for |
5326 | /// the given non-type template parameter. |
5327 | /// |
5328 | /// \param SemaRef the semantic analysis object for which we are performing |
5329 | /// the substitution. |
5330 | /// |
5331 | /// \param Template the template that we are synthesizing template arguments |
5332 | /// for. |
5333 | /// |
5334 | /// \param TemplateLoc the location of the template name that started the |
5335 | /// template-id we are checking. |
5336 | /// |
5337 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
5338 | /// terminates the template-id. |
5339 | /// |
5340 | /// \param Param the non-type template parameter whose default we are |
5341 | /// substituting into. |
5342 | /// |
5343 | /// \param Converted the list of template arguments provided for template |
5344 | /// parameters that precede \p Param in the template parameter list. |
5345 | /// |
5346 | /// \returns the substituted template argument, or NULL if an error occurred. |
5347 | static ExprResult SubstDefaultTemplateArgument( |
5348 | Sema &SemaRef, TemplateDecl *Template, SourceLocation TemplateLoc, |
5349 | SourceLocation RAngleLoc, NonTypeTemplateParmDecl *Param, |
5350 | ArrayRef<TemplateArgument> SugaredConverted, |
5351 | ArrayRef<TemplateArgument> CanonicalConverted) { |
5352 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, Param, Template, |
5353 | SugaredConverted, |
5354 | SourceRange(TemplateLoc, RAngleLoc)); |
5355 | if (Inst.isInvalid()) |
5356 | return ExprError(); |
5357 | |
5358 | // Only substitute for the innermost template argument list. |
5359 | MultiLevelTemplateArgumentList TemplateArgLists(Template, SugaredConverted, |
5360 | /*Final=*/true); |
5361 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
5362 | TemplateArgLists.addOuterTemplateArguments(std::nullopt); |
5363 | |
5364 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); |
5365 | EnterExpressionEvaluationContext ConstantEvaluated( |
5366 | SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
5367 | return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists); |
5368 | } |
5369 | |
5370 | /// Substitute template arguments into the default template argument for |
5371 | /// the given template template parameter. |
5372 | /// |
5373 | /// \param SemaRef the semantic analysis object for which we are performing |
5374 | /// the substitution. |
5375 | /// |
5376 | /// \param Template the template that we are synthesizing template arguments |
5377 | /// for. |
5378 | /// |
5379 | /// \param TemplateLoc the location of the template name that started the |
5380 | /// template-id we are checking. |
5381 | /// |
5382 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
5383 | /// terminates the template-id. |
5384 | /// |
5385 | /// \param Param the template template parameter whose default we are |
5386 | /// substituting into. |
5387 | /// |
5388 | /// \param Converted the list of template arguments provided for template |
5389 | /// parameters that precede \p Param in the template parameter list. |
5390 | /// |
5391 | /// \param QualifierLoc Will be set to the nested-name-specifier (with |
5392 | /// source-location information) that precedes the template name. |
5393 | /// |
5394 | /// \returns the substituted template argument, or NULL if an error occurred. |
5395 | static TemplateName SubstDefaultTemplateArgument( |
5396 | Sema &SemaRef, TemplateDecl *Template, SourceLocation TemplateLoc, |
5397 | SourceLocation RAngleLoc, TemplateTemplateParmDecl *Param, |
5398 | ArrayRef<TemplateArgument> SugaredConverted, |
5399 | ArrayRef<TemplateArgument> CanonicalConverted, |
5400 | NestedNameSpecifierLoc &QualifierLoc) { |
5401 | Sema::InstantiatingTemplate Inst( |
5402 | SemaRef, TemplateLoc, TemplateParameter(Param), Template, |
5403 | SugaredConverted, SourceRange(TemplateLoc, RAngleLoc)); |
5404 | if (Inst.isInvalid()) |
5405 | return TemplateName(); |
5406 | |
5407 | // Only substitute for the innermost template argument list. |
5408 | MultiLevelTemplateArgumentList TemplateArgLists(Template, SugaredConverted, |
5409 | /*Final=*/true); |
5410 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
5411 | TemplateArgLists.addOuterTemplateArguments(std::nullopt); |
5412 | |
5413 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); |
5414 | // Substitute into the nested-name-specifier first, |
5415 | QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc(); |
5416 | if (QualifierLoc) { |
5417 | QualifierLoc = |
5418 | SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists); |
5419 | if (!QualifierLoc) |
5420 | return TemplateName(); |
5421 | } |
5422 | |
5423 | return SemaRef.SubstTemplateName( |
5424 | QualifierLoc, |
5425 | Param->getDefaultArgument().getArgument().getAsTemplate(), |
5426 | Param->getDefaultArgument().getTemplateNameLoc(), |
5427 | TemplateArgLists); |
5428 | } |
5429 | |
5430 | /// If the given template parameter has a default template |
5431 | /// argument, substitute into that default template argument and |
5432 | /// return the corresponding template argument. |
5433 | TemplateArgumentLoc Sema::SubstDefaultTemplateArgumentIfAvailable( |
5434 | TemplateDecl *Template, SourceLocation TemplateLoc, |
5435 | SourceLocation RAngleLoc, Decl *Param, |
5436 | ArrayRef<TemplateArgument> SugaredConverted, |
5437 | ArrayRef<TemplateArgument> CanonicalConverted, bool &HasDefaultArg) { |
5438 | HasDefaultArg = false; |
5439 | |
5440 | if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) { |
5441 | if (!hasReachableDefaultArgument(TypeParm)) |
5442 | return TemplateArgumentLoc(); |
5443 | |
5444 | HasDefaultArg = true; |
5445 | TypeSourceInfo *DI = SubstDefaultTemplateArgument( |
5446 | *this, Template, TemplateLoc, RAngleLoc, TypeParm, SugaredConverted, |
5447 | CanonicalConverted); |
5448 | if (DI) |
5449 | return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI); |
5450 | |
5451 | return TemplateArgumentLoc(); |
5452 | } |
5453 | |
5454 | if (NonTypeTemplateParmDecl *NonTypeParm |
5455 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
5456 | if (!hasReachableDefaultArgument(NonTypeParm)) |
5457 | return TemplateArgumentLoc(); |
5458 | |
5459 | HasDefaultArg = true; |
5460 | ExprResult Arg = SubstDefaultTemplateArgument( |
5461 | *this, Template, TemplateLoc, RAngleLoc, NonTypeParm, SugaredConverted, |
5462 | CanonicalConverted); |
5463 | if (Arg.isInvalid()) |
5464 | return TemplateArgumentLoc(); |
5465 | |
5466 | Expr *ArgE = Arg.getAs<Expr>(); |
5467 | return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE); |
5468 | } |
5469 | |
5470 | TemplateTemplateParmDecl *TempTempParm |
5471 | = cast<TemplateTemplateParmDecl>(Param); |
5472 | if (!hasReachableDefaultArgument(TempTempParm)) |
5473 | return TemplateArgumentLoc(); |
5474 | |
5475 | HasDefaultArg = true; |
5476 | NestedNameSpecifierLoc QualifierLoc; |
5477 | TemplateName TName = SubstDefaultTemplateArgument( |
5478 | *this, Template, TemplateLoc, RAngleLoc, TempTempParm, SugaredConverted, |
5479 | CanonicalConverted, QualifierLoc); |
5480 | if (TName.isNull()) |
5481 | return TemplateArgumentLoc(); |
5482 | |
5483 | return TemplateArgumentLoc( |
5484 | Context, TemplateArgument(TName), |
5485 | TempTempParm->getDefaultArgument().getTemplateQualifierLoc(), |
5486 | TempTempParm->getDefaultArgument().getTemplateNameLoc()); |
5487 | } |
5488 | |
5489 | /// Convert a template-argument that we parsed as a type into a template, if |
5490 | /// possible. C++ permits injected-class-names to perform dual service as |
5491 | /// template template arguments and as template type arguments. |
5492 | static TemplateArgumentLoc |
5493 | convertTypeTemplateArgumentToTemplate(ASTContext &Context, TypeLoc TLoc) { |
5494 | // Extract and step over any surrounding nested-name-specifier. |
5495 | NestedNameSpecifierLoc QualLoc; |
5496 | if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) { |
5497 | if (ETLoc.getTypePtr()->getKeyword() != ETK_None) |
5498 | return TemplateArgumentLoc(); |
5499 | |
5500 | QualLoc = ETLoc.getQualifierLoc(); |
5501 | TLoc = ETLoc.getNamedTypeLoc(); |
5502 | } |
5503 | // If this type was written as an injected-class-name, it can be used as a |
5504 | // template template argument. |
5505 | if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>()) |
5506 | return TemplateArgumentLoc(Context, InjLoc.getTypePtr()->getTemplateName(), |
5507 | QualLoc, InjLoc.getNameLoc()); |
5508 | |
5509 | // If this type was written as an injected-class-name, it may have been |
5510 | // converted to a RecordType during instantiation. If the RecordType is |
5511 | // *not* wrapped in a TemplateSpecializationType and denotes a class |
5512 | // template specialization, it must have come from an injected-class-name. |
5513 | if (auto RecLoc = TLoc.getAs<RecordTypeLoc>()) |
5514 | if (auto *CTSD = |
5515 | dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl())) |
5516 | return TemplateArgumentLoc(Context, |
5517 | TemplateName(CTSD->getSpecializedTemplate()), |
5518 | QualLoc, RecLoc.getNameLoc()); |
5519 | |
5520 | return TemplateArgumentLoc(); |
5521 | } |
5522 | |
5523 | /// Check that the given template argument corresponds to the given |
5524 | /// template parameter. |
5525 | /// |
5526 | /// \param Param The template parameter against which the argument will be |
5527 | /// checked. |
5528 | /// |
5529 | /// \param Arg The template argument, which may be updated due to conversions. |
5530 | /// |
5531 | /// \param Template The template in which the template argument resides. |
5532 | /// |
5533 | /// \param TemplateLoc The location of the template name for the template |
5534 | /// whose argument list we're matching. |
5535 | /// |
5536 | /// \param RAngleLoc The location of the right angle bracket ('>') that closes |
5537 | /// the template argument list. |
5538 | /// |
5539 | /// \param ArgumentPackIndex The index into the argument pack where this |
5540 | /// argument will be placed. Only valid if the parameter is a parameter pack. |
5541 | /// |
5542 | /// \param Converted The checked, converted argument will be added to the |
5543 | /// end of this small vector. |
5544 | /// |
5545 | /// \param CTAK Describes how we arrived at this particular template argument: |
5546 | /// explicitly written, deduced, etc. |
5547 | /// |
5548 | /// \returns true on error, false otherwise. |
5549 | bool Sema::CheckTemplateArgument( |
5550 | NamedDecl *Param, TemplateArgumentLoc &Arg, NamedDecl *Template, |
5551 | SourceLocation TemplateLoc, SourceLocation RAngleLoc, |
5552 | unsigned ArgumentPackIndex, |
5553 | SmallVectorImpl<TemplateArgument> &SugaredConverted, |
5554 | SmallVectorImpl<TemplateArgument> &CanonicalConverted, |
5555 | CheckTemplateArgumentKind CTAK) { |
5556 | // Check template type parameters. |
5557 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) |
5558 | return CheckTemplateTypeArgument(TTP, Arg, SugaredConverted, |
5559 | CanonicalConverted); |
5560 | |
5561 | // Check non-type template parameters. |
5562 | if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
5563 | // Do substitution on the type of the non-type template parameter |
5564 | // with the template arguments we've seen thus far. But if the |
5565 | // template has a dependent context then we cannot substitute yet. |
5566 | QualType NTTPType = NTTP->getType(); |
5567 | if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack()) |
5568 | NTTPType = NTTP->getExpansionType(ArgumentPackIndex); |
5569 | |
5570 | if (NTTPType->isInstantiationDependentType() && |
5571 | !isa<TemplateTemplateParmDecl>(Template) && |
5572 | !Template->getDeclContext()->isDependentContext()) { |
5573 | // Do substitution on the type of the non-type template parameter. |
5574 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, NTTP, |
5575 | SugaredConverted, |
5576 | SourceRange(TemplateLoc, RAngleLoc)); |
5577 | if (Inst.isInvalid()) |
5578 | return true; |
5579 | |
5580 | MultiLevelTemplateArgumentList MLTAL(Template, SugaredConverted, |
5581 | /*Final=*/true); |
5582 | // If the parameter is a pack expansion, expand this slice of the pack. |
5583 | if (auto *PET = NTTPType->getAs<PackExpansionType>()) { |
5584 | Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, |
5585 | ArgumentPackIndex); |
5586 | NTTPType = SubstType(PET->getPattern(), MLTAL, NTTP->getLocation(), |
5587 | NTTP->getDeclName()); |
5588 | } else { |
5589 | NTTPType = SubstType(NTTPType, MLTAL, NTTP->getLocation(), |
5590 | NTTP->getDeclName()); |
5591 | } |
5592 | |
5593 | // If that worked, check the non-type template parameter type |
5594 | // for validity. |
5595 | if (!NTTPType.isNull()) |
5596 | NTTPType = CheckNonTypeTemplateParameterType(NTTPType, |
5597 | NTTP->getLocation()); |
5598 | if (NTTPType.isNull()) |
5599 | return true; |
5600 | } |
5601 | |
5602 | switch (Arg.getArgument().getKind()) { |
5603 | case TemplateArgument::Null: |
5604 | llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here" , "clang/lib/Sema/SemaTemplate.cpp", 5604); |
5605 | |
5606 | case TemplateArgument::Expression: { |
5607 | Expr *E = Arg.getArgument().getAsExpr(); |
5608 | TemplateArgument SugaredResult, CanonicalResult; |
5609 | unsigned CurSFINAEErrors = NumSFINAEErrors; |
5610 | ExprResult Res = CheckTemplateArgument(NTTP, NTTPType, E, SugaredResult, |
5611 | CanonicalResult, CTAK); |
5612 | if (Res.isInvalid()) |
5613 | return true; |
5614 | // If the current template argument causes an error, give up now. |
5615 | if (CurSFINAEErrors < NumSFINAEErrors) |
5616 | return true; |
5617 | |
5618 | // If the resulting expression is new, then use it in place of the |
5619 | // old expression in the template argument. |
5620 | if (Res.get() != E) { |
5621 | TemplateArgument TA(Res.get()); |
5622 | Arg = TemplateArgumentLoc(TA, Res.get()); |
5623 | } |
5624 | |
5625 | SugaredConverted.push_back(SugaredResult); |
5626 | CanonicalConverted.push_back(CanonicalResult); |
5627 | break; |
5628 | } |
5629 | |
5630 | case TemplateArgument::Declaration: |
5631 | case TemplateArgument::Integral: |
5632 | case TemplateArgument::NullPtr: |
5633 | // We've already checked this template argument, so just copy |
5634 | // it to the list of converted arguments. |
5635 | SugaredConverted.push_back(Arg.getArgument()); |
5636 | CanonicalConverted.push_back( |
5637 | Context.getCanonicalTemplateArgument(Arg.getArgument())); |
5638 | break; |
5639 | |
5640 | case TemplateArgument::Template: |
5641 | case TemplateArgument::TemplateExpansion: |
5642 | // We were given a template template argument. It may not be ill-formed; |
5643 | // see below. |
5644 | if (DependentTemplateName *DTN |
5645 | = Arg.getArgument().getAsTemplateOrTemplatePattern() |
5646 | .getAsDependentTemplateName()) { |
5647 | // We have a template argument such as \c T::template X, which we |
5648 | // parsed as a template template argument. However, since we now |
5649 | // know that we need a non-type template argument, convert this |
5650 | // template name into an expression. |
5651 | |
5652 | DeclarationNameInfo NameInfo(DTN->getIdentifier(), |
5653 | Arg.getTemplateNameLoc()); |
5654 | |
5655 | CXXScopeSpec SS; |
5656 | SS.Adopt(Arg.getTemplateQualifierLoc()); |
5657 | // FIXME: the template-template arg was a DependentTemplateName, |
5658 | // so it was provided with a template keyword. However, its source |
5659 | // location is not stored in the template argument structure. |
5660 | SourceLocation TemplateKWLoc; |
5661 | ExprResult E = DependentScopeDeclRefExpr::Create( |
5662 | Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo, |
5663 | nullptr); |
5664 | |
5665 | // If we parsed the template argument as a pack expansion, create a |
5666 | // pack expansion expression. |
5667 | if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){ |
5668 | E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc()); |
5669 | if (E.isInvalid()) |
5670 | return true; |
5671 | } |
5672 | |
5673 | TemplateArgument SugaredResult, CanonicalResult; |
5674 | E = CheckTemplateArgument(NTTP, NTTPType, E.get(), SugaredResult, |
5675 | CanonicalResult, CTAK_Specified); |
5676 | if (E.isInvalid()) |
5677 | return true; |
5678 | |
5679 | SugaredConverted.push_back(SugaredResult); |
5680 | CanonicalConverted.push_back(CanonicalResult); |
5681 | break; |
5682 | } |
5683 | |
5684 | // We have a template argument that actually does refer to a class |
5685 | // template, alias template, or template template parameter, and |
5686 | // therefore cannot be a non-type template argument. |
5687 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr) |
5688 | << Arg.getSourceRange(); |
5689 | |
5690 | Diag(Param->getLocation(), diag::note_template_param_here); |
5691 | return true; |
5692 | |
5693 | case TemplateArgument::Type: { |
5694 | // We have a non-type template parameter but the template |
5695 | // argument is a type. |
5696 | |
5697 | // C++ [temp.arg]p2: |
5698 | // In a template-argument, an ambiguity between a type-id and |
5699 | // an expression is resolved to a type-id, regardless of the |
5700 | // form of the corresponding template-parameter. |
5701 | // |
5702 | // We warn specifically about this case, since it can be rather |
5703 | // confusing for users. |
5704 | QualType T = Arg.getArgument().getAsType(); |
5705 | SourceRange SR = Arg.getSourceRange(); |
5706 | if (T->isFunctionType()) |
5707 | Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T; |
5708 | else |
5709 | Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR; |
5710 | Diag(Param->getLocation(), diag::note_template_param_here); |
5711 | return true; |
5712 | } |
5713 | |
5714 | case TemplateArgument::Pack: |
5715 | llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs" , "clang/lib/Sema/SemaTemplate.cpp", 5715); |
5716 | } |
5717 | |
5718 | return false; |
5719 | } |
5720 | |
5721 | |
5722 | // Check template template parameters. |
5723 | TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param); |
5724 | |
5725 | TemplateParameterList *Params = TempParm->getTemplateParameters(); |
5726 | if (TempParm->isExpandedParameterPack()) |
5727 | Params = TempParm->getExpansionTemplateParameters(ArgumentPackIndex); |
5728 | |
5729 | // Substitute into the template parameter list of the template |
5730 | // template parameter, since previously-supplied template arguments |
5731 | // may appear within the template template parameter. |
5732 | // |
5733 | // FIXME: Skip this if the parameters aren't instantiation-dependent. |
5734 | { |
5735 | // Set up a template instantiation context. |
5736 | LocalInstantiationScope Scope(*this); |
5737 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, TempParm, |
5738 | SugaredConverted, |
5739 | SourceRange(TemplateLoc, RAngleLoc)); |
5740 | if (Inst.isInvalid()) |
5741 | return true; |
5742 | |
5743 | Params = |
5744 | SubstTemplateParams(Params, CurContext, |
5745 | MultiLevelTemplateArgumentList( |
5746 | Template, SugaredConverted, /*Final=*/true), |
5747 | /*EvaluateConstraints=*/false); |
5748 | if (!Params) |
5749 | return true; |
5750 | } |
5751 | |
5752 | // C++1z [temp.local]p1: (DR1004) |
5753 | // When [the injected-class-name] is used [...] as a template-argument for |
5754 | // a template template-parameter [...] it refers to the class template |
5755 | // itself. |
5756 | if (Arg.getArgument().getKind() == TemplateArgument::Type) { |
5757 | TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate( |
5758 | Context, Arg.getTypeSourceInfo()->getTypeLoc()); |
5759 | if (!ConvertedArg.getArgument().isNull()) |
5760 | Arg = ConvertedArg; |
5761 | } |
5762 | |
5763 | switch (Arg.getArgument().getKind()) { |
5764 | case TemplateArgument::Null: |
5765 | llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here" , "clang/lib/Sema/SemaTemplate.cpp", 5765); |
5766 | |
5767 | case TemplateArgument::Template: |
5768 | case TemplateArgument::TemplateExpansion: |
5769 | if (CheckTemplateTemplateArgument(TempParm, Params, Arg)) |
5770 | return true; |
5771 | |
5772 | SugaredConverted.push_back(Arg.getArgument()); |
5773 | CanonicalConverted.push_back( |
5774 | Context.getCanonicalTemplateArgument(Arg.getArgument())); |
5775 | break; |
5776 | |
5777 | case TemplateArgument::Expression: |
5778 | case TemplateArgument::Type: |
5779 | // We have a template template parameter but the template |
5780 | // argument does not refer to a template. |
5781 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_template) |
5782 | << getLangOpts().CPlusPlus11; |
5783 | return true; |
5784 | |
5785 | case TemplateArgument::Declaration: |
5786 | llvm_unreachable("Declaration argument with template template parameter")::llvm::llvm_unreachable_internal("Declaration argument with template template parameter" , "clang/lib/Sema/SemaTemplate.cpp", 5786); |
5787 | case TemplateArgument::Integral: |
5788 | llvm_unreachable("Integral argument with template template parameter")::llvm::llvm_unreachable_internal("Integral argument with template template parameter" , "clang/lib/Sema/SemaTemplate.cpp", 5788); |
5789 | case TemplateArgument::NullPtr: |
5790 | llvm_unreachable("Null pointer argument with template template parameter")::llvm::llvm_unreachable_internal("Null pointer argument with template template parameter" , "clang/lib/Sema/SemaTemplate.cpp", 5790); |
5791 | |
5792 | case TemplateArgument::Pack: |
5793 | llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs" , "clang/lib/Sema/SemaTemplate.cpp", 5793); |
5794 | } |
5795 | |
5796 | return false; |
5797 | } |
5798 | |
5799 | /// Diagnose a missing template argument. |
5800 | template<typename TemplateParmDecl> |
5801 | static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc, |
5802 | TemplateDecl *TD, |
5803 | const TemplateParmDecl *D, |
5804 | TemplateArgumentListInfo &Args) { |
5805 | // Dig out the most recent declaration of the template parameter; there may be |
5806 | // declarations of the template that are more recent than TD. |
5807 | D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl()) |
5808 | ->getTemplateParameters() |
5809 | ->getParam(D->getIndex())); |
5810 | |
5811 | // If there's a default argument that's not reachable, diagnose that we're |
5812 | // missing a module import. |
5813 | llvm::SmallVector<Module*, 8> Modules; |
5814 | if (D->hasDefaultArgument() && !S.hasReachableDefaultArgument(D, &Modules)) { |
5815 | S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD), |
5816 | D->getDefaultArgumentLoc(), Modules, |
5817 | Sema::MissingImportKind::DefaultArgument, |
5818 | /*Recover*/true); |
5819 | return true; |
5820 | } |
5821 | |
5822 | // FIXME: If there's a more recent default argument that *is* visible, |
5823 | // diagnose that it was declared too late. |
5824 | |
5825 | TemplateParameterList *Params = TD->getTemplateParameters(); |
5826 | |
5827 | S.Diag(Loc, diag::err_template_arg_list_different_arity) |
5828 | << /*not enough args*/0 |
5829 | << (int)S.getTemplateNameKindForDiagnostics(TemplateName(TD)) |
5830 | << TD; |
5831 | S.Diag(TD->getLocation(), diag::note_template_decl_here) |
5832 | << Params->getSourceRange(); |
5833 | return true; |
5834 | } |
5835 | |
5836 | /// Check that the given template argument list is well-formed |
5837 | /// for specializing the given template. |
5838 | bool Sema::CheckTemplateArgumentList( |
5839 | TemplateDecl *Template, SourceLocation TemplateLoc, |
5840 | TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs, |
5841 | SmallVectorImpl<TemplateArgument> &SugaredConverted, |
5842 | SmallVectorImpl<TemplateArgument> &CanonicalConverted, |
5843 | bool UpdateArgsWithConversions, bool *ConstraintsNotSatisfied) { |
5844 | |
5845 | if (ConstraintsNotSatisfied) |
5846 | *ConstraintsNotSatisfied = false; |
5847 | |
5848 | // Make a copy of the template arguments for processing. Only make the |
5849 | // changes at the end when successful in matching the arguments to the |
5850 | // template. |
5851 | TemplateArgumentListInfo NewArgs = TemplateArgs; |
5852 | |
5853 | // Make sure we get the template parameter list from the most |
5854 | // recent declaration, since that is the only one that is guaranteed to |
5855 | // have all the default template argument information. |
5856 | TemplateParameterList *Params = |
5857 | cast<TemplateDecl>(Template->getMostRecentDecl()) |
5858 | ->getTemplateParameters(); |
5859 | |
5860 | SourceLocation RAngleLoc = NewArgs.getRAngleLoc(); |
5861 | |
5862 | // C++ [temp.arg]p1: |
5863 | // [...] The type and form of each template-argument specified in |
5864 | // a template-id shall match the type and form specified for the |
5865 | // corresponding parameter declared by the template in its |
5866 | // template-parameter-list. |
5867 | bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template); |
5868 | SmallVector<TemplateArgument, 2> SugaredArgumentPack; |
5869 | SmallVector<TemplateArgument, 2> CanonicalArgumentPack; |
5870 | unsigned ArgIdx = 0, NumArgs = NewArgs.size(); |
5871 | LocalInstantiationScope InstScope(*this, true); |
5872 | for (TemplateParameterList::iterator Param = Params->begin(), |
5873 | ParamEnd = Params->end(); |
5874 | Param != ParamEnd; /* increment in loop */) { |
5875 | // If we have an expanded parameter pack, make sure we don't have too |
5876 | // many arguments. |
5877 | if (std::optional<unsigned> Expansions = getExpandedPackSize(*Param)) { |
5878 | if (*Expansions == SugaredArgumentPack.size()) { |
5879 | // We're done with this parameter pack. Pack up its arguments and add |
5880 | // them to the list. |
5881 | SugaredConverted.push_back( |
5882 | TemplateArgument::CreatePackCopy(Context, SugaredArgumentPack)); |
5883 | SugaredArgumentPack.clear(); |
5884 | |
5885 | CanonicalConverted.push_back( |
5886 | TemplateArgument::CreatePackCopy(Context, CanonicalArgumentPack)); |
5887 | CanonicalArgumentPack.clear(); |
5888 | |
5889 | // This argument is assigned to the next parameter. |
5890 | ++Param; |
5891 | continue; |
5892 | } else if (ArgIdx == NumArgs && !PartialTemplateArgs) { |
5893 | // Not enough arguments for this parameter pack. |
5894 | Diag(TemplateLoc, diag::err_template_arg_list_different_arity) |
5895 | << /*not enough args*/0 |
5896 | << (int)getTemplateNameKindForDiagnostics(TemplateName(Template)) |
5897 | << Template; |
5898 | Diag(Template->getLocation(), diag::note_template_decl_here) |
5899 | << Params->getSourceRange(); |
5900 | return true; |
5901 | } |
5902 | } |
5903 | |
5904 | if (ArgIdx < NumArgs) { |
5905 | // Check the template argument we were given. |
5906 | if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template, TemplateLoc, |
5907 | RAngleLoc, SugaredArgumentPack.size(), |
5908 | SugaredConverted, CanonicalConverted, |
5909 | CTAK_Specified)) |
5910 | return true; |
5911 | |
5912 | CanonicalConverted.back().setIsDefaulted( |
5913 | clang::isSubstitutedDefaultArgument( |
5914 | Context, NewArgs[ArgIdx].getArgument(), *Param, |
5915 | CanonicalConverted, Params->getDepth())); |
5916 | |
5917 | bool PackExpansionIntoNonPack = |
5918 | NewArgs[ArgIdx].getArgument().isPackExpansion() && |
5919 | (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param)); |
5920 | if (PackExpansionIntoNonPack && (isa<TypeAliasTemplateDecl>(Template) || |
5921 | isa<ConceptDecl>(Template))) { |
5922 | // Core issue 1430: we have a pack expansion as an argument to an |
5923 | // alias template, and it's not part of a parameter pack. This |
5924 | // can't be canonicalized, so reject it now. |
5925 | // As for concepts - we cannot normalize constraints where this |
5926 | // situation exists. |
5927 | Diag(NewArgs[ArgIdx].getLocation(), |
5928 | diag::err_template_expansion_into_fixed_list) |
5929 | << (isa<ConceptDecl>(Template) ? 1 : 0) |
5930 | << NewArgs[ArgIdx].getSourceRange(); |
5931 | Diag((*Param)->getLocation(), diag::note_template_param_here); |
5932 | return true; |
5933 | } |
5934 | |
5935 | // We're now done with this argument. |
5936 | ++ArgIdx; |
5937 | |
5938 | if ((*Param)->isTemplateParameterPack()) { |
5939 | // The template parameter was a template parameter pack, so take the |
5940 | // deduced argument and place it on the argument pack. Note that we |
5941 | // stay on the same template parameter so that we can deduce more |
5942 | // arguments. |
5943 | SugaredArgumentPack.push_back(SugaredConverted.pop_back_val()); |
5944 | CanonicalArgumentPack.push_back(CanonicalConverted.pop_back_val()); |
5945 | } else { |
5946 | // Move to the next template parameter. |
5947 | ++Param; |
5948 | } |
5949 | |
5950 | // If we just saw a pack expansion into a non-pack, then directly convert |
5951 | // the remaining arguments, because we don't know what parameters they'll |
5952 | // match up with. |
5953 | if (PackExpansionIntoNonPack) { |
5954 | if (!SugaredArgumentPack.empty()) { |
5955 | // If we were part way through filling in an expanded parameter pack, |
5956 | // fall back to just producing individual arguments. |
5957 | SugaredConverted.insert(SugaredConverted.end(), |
5958 | SugaredArgumentPack.begin(), |
5959 | SugaredArgumentPack.end()); |
5960 | SugaredArgumentPack.clear(); |
5961 | |
5962 | CanonicalConverted.insert(CanonicalConverted.end(), |
5963 | CanonicalArgumentPack.begin(), |
5964 | CanonicalArgumentPack.end()); |
5965 | CanonicalArgumentPack.clear(); |
5966 | } |
5967 | |
5968 | while (ArgIdx < NumArgs) { |
5969 | const TemplateArgument &Arg = NewArgs[ArgIdx].getArgument(); |
5970 | SugaredConverted.push_back(Arg); |
5971 | CanonicalConverted.push_back( |
5972 | Context.getCanonicalTemplateArgument(Arg)); |
5973 | ++ArgIdx; |
5974 | } |
5975 | |
5976 | return false; |
5977 | } |
5978 | |
5979 | continue; |
5980 | } |
5981 | |
5982 | // If we're checking a partial template argument list, we're done. |
5983 | if (PartialTemplateArgs) { |
5984 | if ((*Param)->isTemplateParameterPack() && !SugaredArgumentPack.empty()) { |
5985 | SugaredConverted.push_back( |
5986 | TemplateArgument::CreatePackCopy(Context, SugaredArgumentPack)); |
5987 | CanonicalConverted.push_back( |
5988 | TemplateArgument::CreatePackCopy(Context, CanonicalArgumentPack)); |
5989 | } |
5990 | return false; |
5991 | } |
5992 | |
5993 | // If we have a template parameter pack with no more corresponding |
5994 | // arguments, just break out now and we'll fill in the argument pack below. |
5995 | if ((*Param)->isTemplateParameterPack()) { |
5996 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 5997, __extension__ __PRETTY_FUNCTION__ )) |
5997 | "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\"" , "clang/lib/Sema/SemaTemplate.cpp", 5997, __extension__ __PRETTY_FUNCTION__ )); |
5998 | |
5999 | // A non-expanded parameter pack before the end of the parameter list |
6000 | // only occurs for an ill-formed template parameter list, unless we've |
6001 | // got a partial argument list for a function template, so just bail out. |
6002 | if (Param + 1 != ParamEnd) { |
6003 | assert((static_cast <bool> ((Template->getMostRecentDecl()-> getKind() != Decl::Kind::Concept) && "Concept templates must have parameter packs at the end." ) ? void (0) : __assert_fail ("(Template->getMostRecentDecl()->getKind() != Decl::Kind::Concept) && \"Concept templates must have parameter packs at the end.\"" , "clang/lib/Sema/SemaTemplate.cpp", 6005, __extension__ __PRETTY_FUNCTION__ )) |
6004 | (Template->getMostRecentDecl()->getKind() != Decl::Kind::Concept) &&(static_cast <bool> ((Template->getMostRecentDecl()-> getKind() != Decl::Kind::Concept) && "Concept templates must have parameter packs at the end." ) ? void (0) : __assert_fail ("(Template->getMostRecentDecl()->getKind() != Decl::Kind::Concept) && \"Concept templates must have parameter packs at the end.\"" , "clang/lib/Sema/SemaTemplate.cpp", 6005, __extension__ __PRETTY_FUNCTION__ )) |
6005 | "Concept templates must have parameter packs at the end.")(static_cast <bool> ((Template->getMostRecentDecl()-> getKind() != Decl::Kind::Concept) && "Concept templates must have parameter packs at the end." ) ? void (0) : __assert_fail ("(Template->getMostRecentDecl()->getKind() != Decl::Kind::Concept) && \"Concept templates must have parameter packs at the end.\"" , "clang/lib/Sema/SemaTemplate.cpp", 6005, __extension__ __PRETTY_FUNCTION__ )); |
6006 | return true; |
6007 | } |
6008 | |
6009 | SugaredConverted.push_back( |
6010 | TemplateArgument::CreatePackCopy(Context, SugaredArgumentPack)); |
6011 | SugaredArgumentPack.clear(); |
6012 | |
6013 | CanonicalConverted.push_back( |
6014 | TemplateArgument::CreatePackCopy(Context, CanonicalArgumentPack)); |
6015 | CanonicalArgumentPack.clear(); |
6016 | |
6017 | ++Param; |
6018 | continue; |
6019 | } |
6020 | |
6021 | // Check whether we have a default argument. |
6022 | TemplateArgumentLoc Arg; |
6023 | |
6024 | // Retrieve the default template argument from the template |
6025 | // parameter. For each kind of template parameter, we substitute the |
6026 | // template arguments provided thus far and any "outer" template arguments |
6027 | // (when the template parameter was part of a nested template) into |
6028 | // the default argument. |
6029 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) { |
6030 | if (!hasReachableDefaultArgument(TTP)) |
6031 | return diagnoseMissingArgument(*this, TemplateLoc, Template, TTP, |
6032 | NewArgs); |
6033 | |
6034 | TypeSourceInfo *ArgType = SubstDefaultTemplateArgument( |
6035 | *this, Template, TemplateLoc, RAngleLoc, TTP, SugaredConverted, |
6036 | CanonicalConverted); |
6037 | if (!ArgType) |
6038 | return true; |
6039 | |
6040 | Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()), |
6041 | ArgType); |
6042 | } else if (NonTypeTemplateParmDecl *NTTP |
6043 | = dyn_cast<NonTypeTemplateParmDecl>(*Param)) { |
6044 | if (!hasReachableDefaultArgument(NTTP)) |
6045 | return diagnoseMissingArgument(*this, TemplateLoc, Template, NTTP, |
6046 | NewArgs); |
6047 | |
6048 | ExprResult E = SubstDefaultTemplateArgument( |
6049 | *this, Template, TemplateLoc, RAngleLoc, NTTP, SugaredConverted, |
6050 | CanonicalConverted); |
6051 | if (E.isInvalid()) |
6052 | return true; |
6053 | |
6054 | Expr *Ex = E.getAs<Expr>(); |
6055 | Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex); |
6056 | } else { |
6057 | TemplateTemplateParmDecl *TempParm |
6058 | = cast<TemplateTemplateParmDecl>(*Param); |
6059 | |
6060 | if (!hasReachableDefaultArgument(TempParm)) |
6061 | return diagnoseMissingArgument(*this, TemplateLoc, Template, TempParm, |
6062 | NewArgs); |
6063 | |
6064 | NestedNameSpecifierLoc QualifierLoc; |
6065 | TemplateName Name = SubstDefaultTemplateArgument( |
6066 | *this, Template, TemplateLoc, RAngleLoc, TempParm, SugaredConverted, |
6067 | CanonicalConverted, QualifierLoc); |
6068 | if (Name.isNull()) |
6069 | return true; |
6070 | |
6071 | Arg = TemplateArgumentLoc( |
6072 | Context, TemplateArgument(Name), QualifierLoc, |
6073 | TempParm->getDefaultArgument().getTemplateNameLoc()); |
6074 | } |
6075 | |
6076 | // Introduce an instantiation record that describes where we are using |
6077 | // the default template argument. We're not actually instantiating a |
6078 | // template here, we just create this object to put a note into the |
6079 | // context stack. |
6080 | InstantiatingTemplate Inst(*this, RAngleLoc, Template, *Param, |
6081 | SugaredConverted, |
6082 | SourceRange(TemplateLoc, RAngleLoc)); |
6083 | if (Inst.isInvalid()) |
6084 | return true; |
6085 | |
6086 | // Check the default template argument. |
6087 | if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc, RAngleLoc, 0, |
6088 | SugaredConverted, CanonicalConverted, |
6089 | CTAK_Specified)) |
6090 | return true; |
6091 | |
6092 | CanonicalConverted.back().setIsDefaulted(true); |
6093 | |
6094 | // Core issue 150 (assumed resolution): if this is a template template |
6095 | // parameter, keep track of the default template arguments from the |
6096 | // template definition. |
6097 | if (isTemplateTemplateParameter) |
6098 | NewArgs.addArgument(Arg); |
6099 | |
6100 | // Move to the next template parameter and argument. |
6101 | ++Param; |
6102 | ++ArgIdx; |
6103 | } |
6104 | |
6105 | // If we're performing a partial argument substitution, allow any trailing |
6106 | // pack expansions; they might be empty. This can happen even if |
6107 | // PartialTemplateArgs is false (the list of arguments is complete but |
6108 | // still dependent). |
6109 | if (ArgIdx < NumArgs && CurrentInstantiationScope && |
6110 | CurrentInstantiationScope->getPartiallySubstitutedPack()) { |
6111 | while (ArgIdx < NumArgs && |
6112 | NewArgs[ArgIdx].getArgument().isPackExpansion()) { |
6113 | const TemplateArgument &Arg = NewArgs[ArgIdx++].getArgument(); |
6114 | SugaredConverted.push_back(Arg); |
6115 | CanonicalConverted.push_back(Context.getCanonicalTemplateArgument(Arg)); |
6116 | } |
6117 | } |
6118 | |
6119 | // If we have any leftover arguments, then there were too many arguments. |
6120 | // Complain and fail. |
6121 | if (ArgIdx < NumArgs) { |
6122 | Diag(TemplateLoc, diag::err_template_arg_list_different_arity) |
6123 | << /*too many args*/1 |
6124 | << (int)getTemplateNameKindForDiagnostics(TemplateName(Template)) |
6125 | << Template |
6126 | << SourceRange(NewArgs[ArgIdx].getLocation(), NewArgs.getRAngleLoc()); |
6127 | Diag(Template->getLocation(), diag::note_template_decl_here) |
6128 | << Params->getSourceRange(); |
6129 | return true; |
6130 | } |
6131 | |
6132 | // No problems found with the new argument list, propagate changes back |
6133 | // to caller. |
6134 | if (UpdateArgsWithConversions) |
6135 | TemplateArgs = std::move(NewArgs); |
6136 | |
6137 | if (!PartialTemplateArgs) { |
6138 | TemplateArgumentList StackTemplateArgs(TemplateArgumentList::OnStack, |
6139 | CanonicalConverted); |
6140 | // Setup the context/ThisScope for the case where we are needing to |
6141 | // re-instantiate constraints outside of normal instantiation. |
6142 | DeclContext *NewContext = Template->getDeclContext(); |
6143 | |
6144 | // If this template is in a template, make sure we extract the templated |
6145 | // decl. |
6146 | if (auto *TD = dyn_cast<TemplateDecl>(NewContext)) |
6147 | NewContext = Decl::castToDeclContext(TD->getTemplatedDecl()); |
6148 | auto *RD = dyn_cast<CXXRecordDecl>(NewContext); |
6149 | |
6150 | Qualifiers ThisQuals; |
6151 | if (const auto *Method = |
6152 | dyn_cast_or_null<CXXMethodDecl>(Template->getTemplatedDecl())) |
6153 | ThisQuals = Method->getMethodQualifiers(); |
6154 | |
6155 | ContextRAII Context(*this, NewContext); |
6156 | CXXThisScopeRAII(*this, RD, ThisQuals, RD != nullptr); |
6157 | |
6158 | MultiLevelTemplateArgumentList MLTAL = getTemplateInstantiationArgs( |
6159 | Template, /*Final=*/false, &StackTemplateArgs, |
6160 | /*RelativeToPrimary=*/true, |
6161 | /*Pattern=*/nullptr, |
6162 | /*ForConceptInstantiation=*/true); |
6163 | if (EnsureTemplateArgumentListConstraints( |
6164 | Template, MLTAL, |
6165 | SourceRange(TemplateLoc, TemplateArgs.getRAngleLoc()))) { |
6166 | if (ConstraintsNotSatisfied) |
6167 | *ConstraintsNotSatisfied = true; |
6168 | return true; |
6169 | } |
6170 | } |
6171 | |
6172 | return false; |
6173 | } |
6174 | |
6175 | namespace { |
6176 | class UnnamedLocalNoLinkageFinder |
6177 | : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool> |
6178 | { |
6179 | Sema &S; |
6180 | SourceRange SR; |
6181 | |
6182 | typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited; |
6183 | |
6184 | public: |
6185 | UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { } |
6186 | |
6187 | bool Visit(QualType T) { |
6188 | return T.isNull() ? false : inherited::Visit(T.getTypePtr()); |
6189 | } |
6190 | |
6191 | #define TYPE(Class, Parent) \ |
6192 | bool Visit##Class##Type(const Class##Type *); |
6193 | #define ABSTRACT_TYPE(Class, Parent) \ |
6194 | bool Visit##Class##Type(const Class##Type *) { return false; } |
6195 | #define NON_CANONICAL_TYPE(Class, Parent) \ |
6196 | bool Visit##Class##Type(const Class##Type *) { return false; } |
6197 | #include "clang/AST/TypeNodes.inc" |
6198 | |
6199 | bool VisitTagDecl(const TagDecl *Tag); |
6200 | bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS); |
6201 | }; |
6202 | } // end anonymous namespace |
6203 | |
6204 | bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) { |
6205 | return false; |
6206 | } |
6207 | |
6208 | bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) { |
6209 | return Visit(T->getElementType()); |
6210 | } |
6211 | |
6212 | bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) { |
6213 | return Visit(T->getPointeeType()); |
6214 | } |
6215 | |
6216 | bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType( |
6217 | const BlockPointerType* T) { |
6218 | return Visit(T->getPointeeType()); |
6219 | } |
6220 | |
6221 | bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType( |
6222 | const LValueReferenceType* T) { |
6223 | return Visit(T->getPointeeType()); |
6224 | } |
6225 | |
6226 | bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType( |
6227 | const RValueReferenceType* T) { |
6228 | return Visit(T->getPointeeType()); |
6229 | } |
6230 | |
6231 | bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType( |
6232 | const MemberPointerType* T) { |
6233 | return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0)); |
6234 | } |
6235 | |
6236 | bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType( |
6237 | const ConstantArrayType* T) { |
6238 | return Visit(T->getElementType()); |
6239 | } |
6240 | |
6241 | bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType( |
6242 | const IncompleteArrayType* T) { |
6243 | return Visit(T->getElementType()); |
6244 | } |
6245 | |
6246 | bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType( |
6247 | const VariableArrayType* T) { |
6248 | return Visit(T->getElementType()); |
6249 | } |
6250 | |
6251 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType( |
6252 | const DependentSizedArrayType* T) { |
6253 | return Visit(T->getElementType()); |
6254 | } |
6255 | |
6256 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType( |
6257 | const DependentSizedExtVectorType* T) { |
6258 | return Visit(T->getElementType()); |
6259 | } |
6260 | |
6261 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedMatrixType( |
6262 | const DependentSizedMatrixType *T) { |
6263 | return Visit(T->getElementType()); |
6264 | } |
6265 | |
6266 | bool UnnamedLocalNoLinkageFinder::VisitDependentAddressSpaceType( |
6267 | const DependentAddressSpaceType *T) { |
6268 | return Visit(T->getPointeeType()); |
6269 | } |
6270 | |
6271 | bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) { |
6272 | return Visit(T->getElementType()); |
6273 | } |
6274 | |
6275 | bool UnnamedLocalNoLinkageFinder::VisitDependentVectorType( |
6276 | const DependentVectorType *T) { |
6277 | return Visit(T->getElementType()); |
6278 | } |
6279 | |
6280 | bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) { |
6281 | return Visit(T->getElementType()); |
6282 | } |
6283 | |
6284 | bool UnnamedLocalNoLinkageFinder::VisitConstantMatrixType( |
6285 | const ConstantMatrixType *T) { |
6286 | return Visit(T->getElementType()); |
6287 | } |
6288 | |
6289 | bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType( |
6290 | const FunctionProtoType* T) { |
6291 | for (const auto &A : T->param_types()) { |
6292 | if (Visit(A)) |
6293 | return true; |
6294 | } |
6295 | |
6296 | return Visit(T->getReturnType()); |
6297 | } |
6298 | |
6299 | bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType( |
6300 | const FunctionNoProtoType* T) { |
6301 | return Visit(T->getReturnType()); |
6302 | } |
6303 | |
6304 | bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType( |
6305 | const UnresolvedUsingType*) { |
6306 | return false; |
6307 | } |
6308 | |
6309 | bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) { |
6310 | return false; |
6311 | } |
6312 | |
6313 | bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) { |
6314 | return Visit(T->getUnmodifiedType()); |
6315 | } |
6316 | |
6317 | bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) { |
6318 | return false; |
6319 | } |
6320 | |
6321 | bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType( |
6322 | const UnaryTransformType*) { |
6323 | return false; |
6324 | } |
6325 | |
6326 | bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) { |
6327 | return Visit(T->getDeducedType()); |
6328 | } |
6329 | |
6330 | bool UnnamedLocalNoLinkageFinder::VisitDeducedTemplateSpecializationType( |
6331 | const DeducedTemplateSpecializationType *T) { |
6332 | return Visit(T->getDeducedType()); |
6333 | } |
6334 | |
6335 | bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) { |
6336 | return VisitTagDecl(T->getDecl()); |
6337 | } |
6338 | |
6339 | bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) { |
6340 | return VisitTagDecl(T->getDecl()); |
6341 | } |
6342 | |
6343 | bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType( |
6344 | const TemplateTypeParmType*) { |
6345 | return false; |
6346 | } |
6347 | |
6348 | bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType( |
6349 | const SubstTemplateTypeParmPackType *) { |
6350 | return false; |
6351 | } |
6352 | |
6353 | bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType( |
6354 | const TemplateSpecializationType*) { |
6355 | return false; |
6356 | } |
6357 | |
6358 | bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType( |
6359 | const InjectedClassNameType* T) { |
6360 | return VisitTagDecl(T->getDecl()); |
6361 | } |
6362 | |
6363 | bool UnnamedLocalNoLinkageFinder::VisitDependentNameType( |
6364 | const DependentNameType* T) { |
6365 | return VisitNestedNameSpecifier(T->getQualifier()); |
6366 | } |
6367 | |
6368 | bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType( |
6369 | const DependentTemplateSpecializationType* T) { |
6370 | if (auto *Q = T->getQualifier()) |
6371 | return VisitNestedNameSpecifier(Q); |
6372 | return false; |
6373 | } |
6374 | |
6375 | bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType( |
6376 | const PackExpansionType* T) { |
6377 | return Visit(T->getPattern()); |
6378 | } |
6379 | |
6380 | bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) { |
6381 | return false; |
6382 | } |
6383 | |
6384 | bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType( |
6385 | const ObjCInterfaceType *) { |
6386 | return false; |
6387 | } |
6388 | |
6389 | bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType( |
6390 | const ObjCObjectPointerType *) { |
6391 | return false; |
6392 | } |
6393 | |
6394 | bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) { |
6395 | return Visit(T->getValueType()); |
6396 | } |
6397 | |
6398 | bool UnnamedLocalNoLinkageFinder::VisitPipeType(const PipeType* T) { |
6399 | return false; |
6400 | } |
6401 | |
6402 | bool UnnamedLocalNoLinkageFinder::VisitBitIntType(const BitIntType *T) { |
6403 | return false; |
6404 | } |
6405 | |
6406 | bool UnnamedLocalNoLinkageFinder::VisitDependentBitIntType( |
6407 | const DependentBitIntType *T) { |
6408 | return false; |
6409 | } |
6410 | |
6411 | bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) { |
6412 | if (Tag->getDeclContext()->isFunctionOrMethod()) { |
6413 | S.Diag(SR.getBegin(), |
6414 | S.getLangOpts().CPlusPlus11 ? |
6415 | diag::warn_cxx98_compat_template_arg_local_type : |
6416 | diag::ext_template_arg_local_type) |
6417 | << S.Context.getTypeDeclType(Tag) << SR; |
6418 | return true; |
6419 | } |
6420 | |
6421 | if (!Tag->hasNameForLinkage()) { |
6422 | S.Diag(SR.getBegin(), |
6423 | S.getLangOpts().CPlusPlus11 ? |
6424 | diag::warn_cxx98_compat_template_arg_unnamed_type : |
6425 | diag::ext_template_arg_unnamed_type) << SR; |
6426 | S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here); |
6427 | return true; |
6428 | } |
6429 | |
6430 | return false; |
6431 | } |
6432 | |
6433 | bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier( |
6434 | NestedNameSpecifier *NNS) { |
6435 | assert(NNS)(static_cast <bool> (NNS) ? void (0) : __assert_fail ("NNS" , "clang/lib/Sema/SemaTemplate.cpp", 6435, __extension__ __PRETTY_FUNCTION__ )); |
6436 | if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix())) |
6437 | return true; |
6438 | |
6439 | switch (NNS->getKind()) { |
6440 | case NestedNameSpecifier::Identifier: |
6441 | case NestedNameSpecifier::Namespace: |
6442 | case NestedNameSpecifier::NamespaceAlias: |
6443 | case NestedNameSpecifier::Global: |
6444 | case NestedNameSpecifier::Super: |
6445 | return false; |
6446 | |
6447 | case NestedNameSpecifier::TypeSpec: |
6448 | case NestedNameSpecifier::TypeSpecWithTemplate: |
6449 | return Visit(QualType(NNS->getAsType(), 0)); |
6450 | } |
6451 | llvm_unreachable("Invalid NestedNameSpecifier::Kind!")::llvm::llvm_unreachable_internal("Invalid NestedNameSpecifier::Kind!" , "clang/lib/Sema/SemaTemplate.cpp", 6451); |
6452 | } |
6453 | |
6454 | /// Check a template argument against its corresponding |
6455 | /// template type parameter. |
6456 | /// |
6457 | /// This routine implements the semantics of C++ [temp.arg.type]. It |
6458 | /// returns true if an error occurred, and false otherwise. |
6459 | bool Sema::CheckTemplateArgument(TypeSourceInfo *ArgInfo) { |
6460 | assert(ArgInfo && "invalid TypeSourceInfo")(static_cast <bool> (ArgInfo && "invalid TypeSourceInfo" ) ? void (0) : __assert_fail ("ArgInfo && \"invalid TypeSourceInfo\"" , "clang/lib/Sema/SemaTemplate.cpp", 6460, __extension__ __PRETTY_FUNCTION__ )); |
6461 | QualType Arg = ArgInfo->getType(); |
6462 | SourceRange SR = ArgInfo->getTypeLoc().getSourceRange(); |
6463 | QualType CanonArg = Context.getCanonicalType(Arg); |
6464 | |
6465 | if (CanonArg->isVariablyModifiedType()) { |
6466 | return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg; |
6467 | } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) { |
6468 | return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR; |
6469 | } |
6470 | |
6471 | // C++03 [temp.arg.type]p2: |
6472 | // A local type, a type with no linkage, an unnamed type or a type |
6473 | // compounded from any of these types shall not be used as a |
6474 | // template-argument for a template type-parameter. |
6475 | // |
6476 | // C++11 allows these, and even in C++03 we allow them as an extension with |
6477 | // a warning. |
6478 | if (LangOpts.CPlusPlus11 || CanonArg->hasUnnamedOrLocalType()) { |
6479 | UnnamedLocalNoLinkageFinder Finder(*this, SR); |
6480 | (void)Finder.Visit(CanonArg); |
6481 | } |
6482 | |
6483 | return false; |
6484 | } |
6485 | |
6486 | enum NullPointerValueKind { |
6487 | NPV_NotNullPointer, |
6488 | NPV_NullPointer, |
6489 | NPV_Error |
6490 | }; |
6491 | |
6492 | /// Determine whether the given template argument is a null pointer |
6493 | /// value of the appropriate type. |
6494 | static NullPointerValueKind |
6495 | isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param, |
6496 | QualType ParamType, Expr *Arg, |
6497 | Decl *Entity = nullptr) { |
6498 | if (Arg->isValueDependent() || Arg->isTypeDependent()) |
6499 | return NPV_NotNullPointer; |
6500 | |
6501 | // dllimport'd entities aren't constant but are available inside of template |
6502 | // arguments. |
6503 | if (Entity && Entity->hasAttr<DLLImportAttr>()) |
6504 | return NPV_NotNullPointer; |
6505 | |
6506 | if (!S.isCompleteType(Arg->getExprLoc(), ParamType)) |
6507 | llvm_unreachable(::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!" , "clang/lib/Sema/SemaTemplate.cpp", 6508) |
6508 | "Incomplete parameter type in isNullPointerValueTemplateArgument!")::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!" , "clang/lib/Sema/SemaTemplate.cpp", 6508); |
6509 | |
6510 | if (!S.getLangOpts().CPlusPlus11) |
6511 | return NPV_NotNullPointer; |
6512 | |
6513 | // Determine whether we have a constant expression. |
6514 | ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg); |
6515 | if (ArgRV.isInvalid()) |
6516 | return NPV_Error; |
6517 | Arg = ArgRV.get(); |
6518 | |
6519 | Expr::EvalResult EvalResult; |
6520 | SmallVector<PartialDiagnosticAt, 8> Notes; |
6521 | EvalResult.Diag = &Notes; |
6522 | if (!Arg->EvaluateAsRValue(EvalResult, S.Context) || |
6523 | EvalResult.HasSideEffects) { |
6524 | SourceLocation DiagLoc = Arg->getExprLoc(); |
6525 | |
6526 | // If our only note is the usual "invalid subexpression" note, just point |
6527 | // the caret at its location rather than producing an essentially |
6528 | // redundant note. |
6529 | if (Notes.size() == 1 && Notes[0].second.getDiagID() == |
6530 | diag::note_invalid_subexpr_in_const_expr) { |
6531 | DiagLoc = Notes[0].first; |
6532 | Notes.clear(); |
6533 | } |
6534 | |
6535 | S.Diag(DiagLoc, diag::err_template_arg_not_address_constant) |
6536 | << Arg->getType() << Arg->getSourceRange(); |
6537 | for (unsigned I = 0, N = Notes.size(); I != N; ++I) |
6538 | S.Diag(Notes[I].first, Notes[I].second); |
6539 | |
6540 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6541 | return NPV_Error; |
6542 | } |
6543 | |
6544 | // C++11 [temp.arg.nontype]p1: |
6545 | // - an address constant expression of type std::nullptr_t |
6546 | if (Arg->getType()->isNullPtrType()) |
6547 | return NPV_NullPointer; |
6548 | |
6549 | // - a constant expression that evaluates to a null pointer value (4.10); or |
6550 | // - a constant expression that evaluates to a null member pointer value |
6551 | // (4.11); or |
6552 | if ((EvalResult.Val.isLValue() && EvalResult.Val.isNullPointer()) || |
6553 | (EvalResult.Val.isMemberPointer() && |
6554 | !EvalResult.Val.getMemberPointerDecl())) { |
6555 | // If our expression has an appropriate type, we've succeeded. |
6556 | bool ObjCLifetimeConversion; |
6557 | if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) || |
6558 | S.IsQualificationConversion(Arg->getType(), ParamType, false, |
6559 | ObjCLifetimeConversion)) |
6560 | return NPV_NullPointer; |
6561 | |
6562 | // The types didn't match, but we know we got a null pointer; complain, |
6563 | // then recover as if the types were correct. |
6564 | S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant) |
6565 | << Arg->getType() << ParamType << Arg->getSourceRange(); |
6566 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6567 | return NPV_NullPointer; |
6568 | } |
6569 | |
6570 | if (EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) { |
6571 | // We found a pointer that isn't null, but doesn't refer to an object. |
6572 | // We could just return NPV_NotNullPointer, but we can print a better |
6573 | // message with the information we have here. |
6574 | S.Diag(Arg->getExprLoc(), diag::err_template_arg_invalid) |
6575 | << EvalResult.Val.getAsString(S.Context, ParamType); |
6576 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6577 | return NPV_Error; |
6578 | } |
6579 | |
6580 | // If we don't have a null pointer value, but we do have a NULL pointer |
6581 | // constant, suggest a cast to the appropriate type. |
6582 | if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) { |
6583 | std::string Code = "static_cast<" + ParamType.getAsString() + ">("; |
6584 | S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant) |
6585 | << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), Code) |
6586 | << FixItHint::CreateInsertion(S.getLocForEndOfToken(Arg->getEndLoc()), |
6587 | ")"); |
6588 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6589 | return NPV_NullPointer; |
6590 | } |
6591 | |
6592 | // FIXME: If we ever want to support general, address-constant expressions |
6593 | // as non-type template arguments, we should return the ExprResult here to |
6594 | // be interpreted by the caller. |
6595 | return NPV_NotNullPointer; |
6596 | } |
6597 | |
6598 | /// Checks whether the given template argument is compatible with its |
6599 | /// template parameter. |
6600 | static bool CheckTemplateArgumentIsCompatibleWithParameter( |
6601 | Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn, |
6602 | Expr *Arg, QualType ArgType) { |
6603 | bool ObjCLifetimeConversion; |
6604 | if (ParamType->isPointerType() && |
6605 | !ParamType->castAs<PointerType>()->getPointeeType()->isFunctionType() && |
6606 | S.IsQualificationConversion(ArgType, ParamType, false, |
6607 | ObjCLifetimeConversion)) { |
6608 | // For pointer-to-object types, qualification conversions are |
6609 | // permitted. |
6610 | } else { |
6611 | if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) { |
6612 | if (!ParamRef->getPointeeType()->isFunctionType()) { |
6613 | // C++ [temp.arg.nontype]p5b3: |
6614 | // For a non-type template-parameter of type reference to |
6615 | // object, no conversions apply. The type referred to by the |
6616 | // reference may be more cv-qualified than the (otherwise |
6617 | // identical) type of the template- argument. The |
6618 | // template-parameter is bound directly to the |
6619 | // template-argument, which shall be an lvalue. |
6620 | |
6621 | // FIXME: Other qualifiers? |
6622 | unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers(); |
6623 | unsigned ArgQuals = ArgType.getCVRQualifiers(); |
6624 | |
6625 | if ((ParamQuals | ArgQuals) != ParamQuals) { |
6626 | S.Diag(Arg->getBeginLoc(), |
6627 | diag::err_template_arg_ref_bind_ignores_quals) |
6628 | << ParamType << Arg->getType() << Arg->getSourceRange(); |
6629 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6630 | return true; |
6631 | } |
6632 | } |
6633 | } |
6634 | |
6635 | // At this point, the template argument refers to an object or |
6636 | // function with external linkage. We now need to check whether the |
6637 | // argument and parameter types are compatible. |
6638 | if (!S.Context.hasSameUnqualifiedType(ArgType, |
6639 | ParamType.getNonReferenceType())) { |
6640 | // We can't perform this conversion or binding. |
6641 | if (ParamType->isReferenceType()) |
6642 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_no_ref_bind) |
6643 | << ParamType << ArgIn->getType() << Arg->getSourceRange(); |
6644 | else |
6645 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible) |
6646 | << ArgIn->getType() << ParamType << Arg->getSourceRange(); |
6647 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6648 | return true; |
6649 | } |
6650 | } |
6651 | |
6652 | return false; |
6653 | } |
6654 | |
6655 | /// Checks whether the given template argument is the address |
6656 | /// of an object or function according to C++ [temp.arg.nontype]p1. |
6657 | static bool CheckTemplateArgumentAddressOfObjectOrFunction( |
6658 | Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn, |
6659 | TemplateArgument &SugaredConverted, TemplateArgument &CanonicalConverted) { |
6660 | bool Invalid = false; |
6661 | Expr *Arg = ArgIn; |
6662 | QualType ArgType = Arg->getType(); |
6663 | |
6664 | bool AddressTaken = false; |
6665 | SourceLocation AddrOpLoc; |
6666 | if (S.getLangOpts().MicrosoftExt) { |
6667 | // Microsoft Visual C++ strips all casts, allows an arbitrary number of |
6668 | // dereference and address-of operators. |
6669 | Arg = Arg->IgnoreParenCasts(); |
6670 | |
6671 | bool ExtWarnMSTemplateArg = false; |
6672 | UnaryOperatorKind FirstOpKind; |
6673 | SourceLocation FirstOpLoc; |
6674 | while (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
6675 | UnaryOperatorKind UnOpKind = UnOp->getOpcode(); |
6676 | if (UnOpKind == UO_Deref) |
6677 | ExtWarnMSTemplateArg = true; |
6678 | if (UnOpKind == UO_AddrOf || UnOpKind == UO_Deref) { |
6679 | Arg = UnOp->getSubExpr()->IgnoreParenCasts(); |
6680 | if (!AddrOpLoc.isValid()) { |
6681 | FirstOpKind = UnOpKind; |
6682 | FirstOpLoc = UnOp->getOperatorLoc(); |
6683 | } |
6684 | } else |
6685 | break; |
6686 | } |
6687 | if (FirstOpLoc.isValid()) { |
6688 | if (ExtWarnMSTemplateArg) |
6689 | S.Diag(ArgIn->getBeginLoc(), diag::ext_ms_deref_template_argument) |
6690 | << ArgIn->getSourceRange(); |
6691 | |
6692 | if (FirstOpKind == UO_AddrOf) |
6693 | AddressTaken = true; |
6694 | else if (Arg->getType()->isPointerType()) { |
6695 | // We cannot let pointers get dereferenced here, that is obviously not a |
6696 | // constant expression. |
6697 | assert(FirstOpKind == UO_Deref)(static_cast <bool> (FirstOpKind == UO_Deref) ? void (0 ) : __assert_fail ("FirstOpKind == UO_Deref", "clang/lib/Sema/SemaTemplate.cpp" , 6697, __extension__ __PRETTY_FUNCTION__)); |
6698 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) |
6699 | << Arg->getSourceRange(); |
6700 | } |
6701 | } |
6702 | } else { |
6703 | // See through any implicit casts we added to fix the type. |
6704 | Arg = Arg->IgnoreImpCasts(); |
6705 | |
6706 | // C++ [temp.arg.nontype]p1: |
6707 | // |
6708 | // A template-argument for a non-type, non-template |
6709 | // template-parameter shall be one of: [...] |
6710 | // |
6711 | // -- the address of an object or function with external |
6712 | // linkage, including function templates and function |
6713 | // template-ids but excluding non-static class members, |
6714 | // expressed as & id-expression where the & is optional if |
6715 | // the name refers to a function or array, or if the |
6716 | // corresponding template-parameter is a reference; or |
6717 | |
6718 | // In C++98/03 mode, give an extension warning on any extra parentheses. |
6719 | // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 |
6720 | bool ExtraParens = false; |
6721 | while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { |
6722 | if (!Invalid && !ExtraParens) { |
6723 | S.Diag(Arg->getBeginLoc(), |
6724 | S.getLangOpts().CPlusPlus11 |
6725 | ? diag::warn_cxx98_compat_template_arg_extra_parens |
6726 | : diag::ext_template_arg_extra_parens) |
6727 | << Arg->getSourceRange(); |
6728 | ExtraParens = true; |
6729 | } |
6730 | |
6731 | Arg = Parens->getSubExpr(); |
6732 | } |
6733 | |
6734 | while (SubstNonTypeTemplateParmExpr *subst = |
6735 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) |
6736 | Arg = subst->getReplacement()->IgnoreImpCasts(); |
6737 | |
6738 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
6739 | if (UnOp->getOpcode() == UO_AddrOf) { |
6740 | Arg = UnOp->getSubExpr(); |
6741 | AddressTaken = true; |
6742 | AddrOpLoc = UnOp->getOperatorLoc(); |
6743 | } |
6744 | } |
6745 | |
6746 | while (SubstNonTypeTemplateParmExpr *subst = |
6747 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) |
6748 | Arg = subst->getReplacement()->IgnoreImpCasts(); |
6749 | } |
6750 | |
6751 | ValueDecl *Entity = nullptr; |
6752 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg)) |
6753 | Entity = DRE->getDecl(); |
6754 | else if (CXXUuidofExpr *CUE = dyn_cast<CXXUuidofExpr>(Arg)) |
6755 | Entity = CUE->getGuidDecl(); |
6756 | |
6757 | // If our parameter has pointer type, check for a null template value. |
6758 | if (ParamType->isPointerType() || ParamType->isNullPtrType()) { |
6759 | switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ArgIn, |
6760 | Entity)) { |
6761 | case NPV_NullPointer: |
6762 | S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); |
6763 | SugaredConverted = TemplateArgument(ParamType, |
6764 | /*isNullPtr=*/true); |
6765 | CanonicalConverted = |
6766 | TemplateArgument(S.Context.getCanonicalType(ParamType), |
6767 | /*isNullPtr=*/true); |
6768 | return false; |
6769 | |
6770 | case NPV_Error: |
6771 | return true; |
6772 | |
6773 | case NPV_NotNullPointer: |
6774 | break; |
6775 | } |
6776 | } |
6777 | |
6778 | // Stop checking the precise nature of the argument if it is value dependent, |
6779 | // it should be checked when instantiated. |
6780 | if (Arg->isValueDependent()) { |
6781 | SugaredConverted = TemplateArgument(ArgIn); |
6782 | CanonicalConverted = |
6783 | S.Context.getCanonicalTemplateArgument(SugaredConverted); |
6784 | return false; |
6785 | } |
6786 | |
6787 | if (!Entity) { |
6788 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) |
6789 | << Arg->getSourceRange(); |
6790 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6791 | return true; |
6792 | } |
6793 | |
6794 | // Cannot refer to non-static data members |
6795 | if (isa<FieldDecl>(Entity) || isa<IndirectFieldDecl>(Entity)) { |
6796 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_field) |
6797 | << Entity << Arg->getSourceRange(); |
6798 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6799 | return true; |
6800 | } |
6801 | |
6802 | // Cannot refer to non-static member functions |
6803 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) { |
6804 | if (!Method->isStatic()) { |
6805 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_method) |
6806 | << Method << Arg->getSourceRange(); |
6807 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6808 | return true; |
6809 | } |
6810 | } |
6811 | |
6812 | FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity); |
6813 | VarDecl *Var = dyn_cast<VarDecl>(Entity); |
6814 | MSGuidDecl *Guid = dyn_cast<MSGuidDecl>(Entity); |
6815 | |
6816 | // A non-type template argument must refer to an object or function. |
6817 | if (!Func && !Var && !Guid) { |
6818 | // We found something, but we don't know specifically what it is. |
6819 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_object_or_func) |
6820 | << Arg->getSourceRange(); |
6821 | S.Diag(Entity->getLocation(), diag::note_template_arg_refers_here); |
6822 | return true; |
6823 | } |
6824 | |
6825 | // Address / reference template args must have external linkage in C++98. |
6826 | if (Entity->getFormalLinkage() == InternalLinkage) { |
6827 | S.Diag(Arg->getBeginLoc(), |
6828 | S.getLangOpts().CPlusPlus11 |
6829 | ? diag::warn_cxx98_compat_template_arg_object_internal |
6830 | : diag::ext_template_arg_object_internal) |
6831 | << !Func << Entity << Arg->getSourceRange(); |
6832 | S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object) |
6833 | << !Func; |
6834 | } else if (!Entity->hasLinkage()) { |
6835 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_object_no_linkage) |
6836 | << !Func << Entity << Arg->getSourceRange(); |
6837 | S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object) |
6838 | << !Func; |
6839 | return true; |
6840 | } |
6841 | |
6842 | if (Var) { |
6843 | // A value of reference type is not an object. |
6844 | if (Var->getType()->isReferenceType()) { |
6845 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_reference_var) |
6846 | << Var->getType() << Arg->getSourceRange(); |
6847 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6848 | return true; |
6849 | } |
6850 | |
6851 | // A template argument must have static storage duration. |
6852 | if (Var->getTLSKind()) { |
6853 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_thread_local) |
6854 | << Arg->getSourceRange(); |
6855 | S.Diag(Var->getLocation(), diag::note_template_arg_refers_here); |
6856 | return true; |
6857 | } |
6858 | } |
6859 | |
6860 | if (AddressTaken && ParamType->isReferenceType()) { |
6861 | // If we originally had an address-of operator, but the |
6862 | // parameter has reference type, complain and (if things look |
6863 | // like they will work) drop the address-of operator. |
6864 | if (!S.Context.hasSameUnqualifiedType(Entity->getType(), |
6865 | ParamType.getNonReferenceType())) { |
6866 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
6867 | << ParamType; |
6868 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6869 | return true; |
6870 | } |
6871 | |
6872 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) |
6873 | << ParamType |
6874 | << FixItHint::CreateRemoval(AddrOpLoc); |
6875 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6876 | |
6877 | ArgType = Entity->getType(); |
6878 | } |
6879 | |
6880 | // If the template parameter has pointer type, either we must have taken the |
6881 | // address or the argument must decay to a pointer. |
6882 | if (!AddressTaken && ParamType->isPointerType()) { |
6883 | if (Func) { |
6884 | // Function-to-pointer decay. |
6885 | ArgType = S.Context.getPointerType(Func->getType()); |
6886 | } else if (Entity->getType()->isArrayType()) { |
6887 | // Array-to-pointer decay. |
6888 | ArgType = S.Context.getArrayDecayedType(Entity->getType()); |
6889 | } else { |
6890 | // If the template parameter has pointer type but the address of |
6891 | // this object was not taken, complain and (possibly) recover by |
6892 | // taking the address of the entity. |
6893 | ArgType = S.Context.getPointerType(Entity->getType()); |
6894 | if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) { |
6895 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of) |
6896 | << ParamType; |
6897 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6898 | return true; |
6899 | } |
6900 | |
6901 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of) |
6902 | << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), "&"); |
6903 | |
6904 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
6905 | } |
6906 | } |
6907 | |
6908 | if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, ArgIn, |
6909 | Arg, ArgType)) |
6910 | return true; |
6911 | |
6912 | // Create the template argument. |
6913 | SugaredConverted = TemplateArgument(Entity, ParamType); |
6914 | CanonicalConverted = |
6915 | TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()), |
6916 | S.Context.getCanonicalType(ParamType)); |
6917 | S.MarkAnyDeclReferenced(Arg->getBeginLoc(), Entity, false); |
6918 | return false; |
6919 | } |
6920 | |
6921 | /// Checks whether the given template argument is a pointer to |
6922 | /// member constant according to C++ [temp.arg.nontype]p1. |
6923 | static bool |
6924 | CheckTemplateArgumentPointerToMember(Sema &S, NonTypeTemplateParmDecl *Param, |
6925 | QualType ParamType, Expr *&ResultArg, |
6926 | TemplateArgument &SugaredConverted, |
6927 | TemplateArgument &CanonicalConverted) { |
6928 | bool Invalid = false; |
6929 | |
6930 | Expr *Arg = ResultArg; |
6931 | bool ObjCLifetimeConversion; |
6932 | |
6933 | // C++ [temp.arg.nontype]p1: |
6934 | // |
6935 | // A template-argument for a non-type, non-template |
6936 | // template-parameter shall be one of: [...] |
6937 | // |
6938 | // -- a pointer to member expressed as described in 5.3.1. |
6939 | DeclRefExpr *DRE = nullptr; |
6940 | |
6941 | // In C++98/03 mode, give an extension warning on any extra parentheses. |
6942 | // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 |
6943 | bool ExtraParens = false; |
6944 | while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { |
6945 | if (!Invalid && !ExtraParens) { |
6946 | S.Diag(Arg->getBeginLoc(), |
6947 | S.getLangOpts().CPlusPlus11 |
6948 | ? diag::warn_cxx98_compat_template_arg_extra_parens |
6949 | : diag::ext_template_arg_extra_parens) |
6950 | << Arg->getSourceRange(); |
6951 | ExtraParens = true; |
6952 | } |
6953 | |
6954 | Arg = Parens->getSubExpr(); |
6955 | } |
6956 | |
6957 | while (SubstNonTypeTemplateParmExpr *subst = |
6958 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) |
6959 | Arg = subst->getReplacement()->IgnoreImpCasts(); |
6960 | |
6961 | // A pointer-to-member constant written &Class::member. |
6962 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { |
6963 | if (UnOp->getOpcode() == UO_AddrOf) { |
6964 | DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr()); |
6965 | if (DRE && !DRE->getQualifier()) |
6966 | DRE = nullptr; |
6967 | } |
6968 | } |
6969 | // A constant of pointer-to-member type. |
6970 | else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) { |
6971 | ValueDecl *VD = DRE->getDecl(); |
6972 | if (VD->getType()->isMemberPointerType()) { |
6973 | if (isa<NonTypeTemplateParmDecl>(VD)) { |
6974 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { |
6975 | SugaredConverted = TemplateArgument(Arg); |
6976 | CanonicalConverted = |
6977 | S.Context.getCanonicalTemplateArgument(SugaredConverted); |
6978 | } else { |
6979 | SugaredConverted = TemplateArgument(VD, ParamType); |
6980 | CanonicalConverted = |
6981 | TemplateArgument(cast<ValueDecl>(VD->getCanonicalDecl()), |
6982 | S.Context.getCanonicalType(ParamType)); |
6983 | } |
6984 | return Invalid; |
6985 | } |
6986 | } |
6987 | |
6988 | DRE = nullptr; |
6989 | } |
6990 | |
6991 | ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr; |
6992 | |
6993 | // Check for a null pointer value. |
6994 | switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ResultArg, |
6995 | Entity)) { |
6996 | case NPV_Error: |
6997 | return true; |
6998 | case NPV_NullPointer: |
6999 | S.Diag(ResultArg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); |
7000 | SugaredConverted = TemplateArgument(ParamType, |
7001 | /*isNullPtr*/ true); |
7002 | CanonicalConverted = TemplateArgument(S.Context.getCanonicalType(ParamType), |
7003 | /*isNullPtr*/ true); |
7004 | return false; |
7005 | case NPV_NotNullPointer: |
7006 | break; |
7007 | } |
7008 | |
7009 | if (S.IsQualificationConversion(ResultArg->getType(), |
7010 | ParamType.getNonReferenceType(), false, |
7011 | ObjCLifetimeConversion)) { |
7012 | ResultArg = S.ImpCastExprToType(ResultArg, ParamType, CK_NoOp, |
7013 | ResultArg->getValueKind()) |
7014 | .get(); |
7015 | } else if (!S.Context.hasSameUnqualifiedType( |
7016 | ResultArg->getType(), ParamType.getNonReferenceType())) { |
7017 | // We can't perform this conversion. |
7018 | S.Diag(ResultArg->getBeginLoc(), diag::err_template_arg_not_convertible) |
7019 | << ResultArg->getType() << ParamType << ResultArg->getSourceRange(); |
7020 | S.Diag(Param->getLocation(), diag::note_template_param_here); |
7021 | return true; |
7022 | } |
7023 | |
7024 | if (!DRE) |
7025 | return S.Diag(Arg->getBeginLoc(), |
7026 | diag::err_template_arg_not_pointer_to_member_form) |
7027 | << Arg->getSourceRange(); |
7028 | |
7029 | if (isa<FieldDecl>(DRE->getDecl()) || |
7030 | isa<IndirectFieldDecl>(DRE->getDecl()) || |
7031 | isa<CXXMethodDecl>(DRE->getDecl())) { |
7032 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 7035, __extension__ __PRETTY_FUNCTION__ )) |
7033 | 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\"" , "clang/lib/Sema/SemaTemplate.cpp", 7035, __extension__ __PRETTY_FUNCTION__ )) |
7034 | !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&(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\"" , "clang/lib/Sema/SemaTemplate.cpp", 7035, __extension__ __PRETTY_FUNCTION__ )) |
7035 | "Only non-static member pointers can make it here")(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\"" , "clang/lib/Sema/SemaTemplate.cpp", 7035, __extension__ __PRETTY_FUNCTION__ )); |
7036 | |
7037 | // Okay: this is the address of a non-static member, and therefore |
7038 | // a member pointer constant. |
7039 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { |
7040 | SugaredConverted = TemplateArgument(Arg); |
7041 | CanonicalConverted = |
7042 | S.Context.getCanonicalTemplateArgument(SugaredConverted); |
7043 | } else { |
7044 | ValueDecl *D = DRE->getDecl(); |
7045 | SugaredConverted = TemplateArgument(D, ParamType); |
7046 | CanonicalConverted = |
7047 | TemplateArgument(cast<ValueDecl>(D->getCanonicalDecl()), |
7048 | S.Context.getCanonicalType(ParamType)); |
7049 | } |
7050 | return Invalid; |
7051 | } |
7052 | |
7053 | // We found something else, but we don't know specifically what it is. |
7054 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_pointer_to_member_form) |
7055 | << Arg->getSourceRange(); |
7056 | S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here); |
7057 | return true; |
7058 | } |
7059 | |
7060 | /// Check a template argument against its corresponding |
7061 | /// non-type template parameter. |
7062 | /// |
7063 | /// This routine implements the semantics of C++ [temp.arg.nontype]. |
7064 | /// If an error occurred, it returns ExprError(); otherwise, it |
7065 | /// returns the converted template argument. \p ParamType is the |
7066 | /// type of the non-type template parameter after it has been instantiated. |
7067 | ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param, |
7068 | QualType ParamType, Expr *Arg, |
7069 | TemplateArgument &SugaredConverted, |
7070 | TemplateArgument &CanonicalConverted, |
7071 | CheckTemplateArgumentKind CTAK) { |
7072 | SourceLocation StartLoc = Arg->getBeginLoc(); |
7073 | |
7074 | // If the parameter type somehow involves auto, deduce the type now. |
7075 | DeducedType *DeducedT = ParamType->getContainedDeducedType(); |
7076 | if (getLangOpts().CPlusPlus17 && DeducedT && !DeducedT->isDeduced()) { |
7077 | // During template argument deduction, we allow 'decltype(auto)' to |
7078 | // match an arbitrary dependent argument. |
7079 | // FIXME: The language rules don't say what happens in this case. |
7080 | // FIXME: We get an opaque dependent type out of decltype(auto) if the |
7081 | // expression is merely instantiation-dependent; is this enough? |
7082 | if (CTAK == CTAK_Deduced && Arg->isTypeDependent()) { |
7083 | auto *AT = dyn_cast<AutoType>(DeducedT); |
7084 | if (AT && AT->isDecltypeAuto()) { |
7085 | SugaredConverted = TemplateArgument(Arg); |
7086 | CanonicalConverted = TemplateArgument( |
7087 | Context.getCanonicalTemplateArgument(SugaredConverted)); |
7088 | return Arg; |
7089 | } |
7090 | } |
7091 | |
7092 | // When checking a deduced template argument, deduce from its type even if |
7093 | // the type is dependent, in order to check the types of non-type template |
7094 | // arguments line up properly in partial ordering. |
7095 | Expr *DeductionArg = Arg; |
7096 | if (auto *PE = dyn_cast<PackExpansionExpr>(DeductionArg)) |
7097 | DeductionArg = PE->getPattern(); |
7098 | TypeSourceInfo *TSI = |
7099 | Context.getTrivialTypeSourceInfo(ParamType, Param->getLocation()); |
7100 | if (isa<DeducedTemplateSpecializationType>(DeducedT)) { |
7101 | InitializedEntity Entity = |
7102 | InitializedEntity::InitializeTemplateParameter(ParamType, Param); |
7103 | InitializationKind Kind = InitializationKind::CreateForInit( |
7104 | DeductionArg->getBeginLoc(), /*DirectInit*/false, DeductionArg); |
7105 | Expr *Inits[1] = {DeductionArg}; |
7106 | ParamType = |
7107 | DeduceTemplateSpecializationFromInitializer(TSI, Entity, Kind, Inits); |
7108 | if (ParamType.isNull()) |
7109 | return ExprError(); |
7110 | } else { |
7111 | TemplateDeductionInfo Info(DeductionArg->getExprLoc(), |
7112 | Param->getDepth() + 1); |
7113 | ParamType = QualType(); |
7114 | TemplateDeductionResult Result = |
7115 | DeduceAutoType(TSI->getTypeLoc(), DeductionArg, ParamType, Info, |
7116 | /*DependentDeduction=*/true, |
7117 | // We do not check constraints right now because the |
7118 | // immediately-declared constraint of the auto type is |
7119 | // also an associated constraint, and will be checked |
7120 | // along with the other associated constraints after |
7121 | // checking the template argument list. |
7122 | /*IgnoreConstraints=*/true); |
7123 | if (Result == TDK_AlreadyDiagnosed) { |
7124 | if (ParamType.isNull()) |
7125 | return ExprError(); |
7126 | } else if (Result != TDK_Success) { |
7127 | Diag(Arg->getExprLoc(), |
7128 | diag::err_non_type_template_parm_type_deduction_failure) |
7129 | << Param->getDeclName() << Param->getType() << Arg->getType() |
7130 | << Arg->getSourceRange(); |
7131 | Diag(Param->getLocation(), diag::note_template_param_here); |
7132 | return ExprError(); |
7133 | } |
7134 | } |
7135 | // CheckNonTypeTemplateParameterType will produce a diagnostic if there's |
7136 | // an error. The error message normally references the parameter |
7137 | // declaration, but here we'll pass the argument location because that's |
7138 | // where the parameter type is deduced. |
7139 | ParamType = CheckNonTypeTemplateParameterType(ParamType, Arg->getExprLoc()); |
7140 | if (ParamType.isNull()) { |
7141 | Diag(Param->getLocation(), diag::note_template_param_here); |
7142 | return ExprError(); |
7143 | } |
7144 | } |
7145 | |
7146 | // We should have already dropped all cv-qualifiers by now. |
7147 | assert(!ParamType.hasQualifiers() &&(static_cast <bool> (!ParamType.hasQualifiers() && "non-type template parameter type cannot be qualified") ? void (0) : __assert_fail ("!ParamType.hasQualifiers() && \"non-type template parameter type cannot be qualified\"" , "clang/lib/Sema/SemaTemplate.cpp", 7148, __extension__ __PRETTY_FUNCTION__ )) |
7148 | "non-type template parameter type cannot be qualified")(static_cast <bool> (!ParamType.hasQualifiers() && "non-type template parameter type cannot be qualified") ? void (0) : __assert_fail ("!ParamType.hasQualifiers() && \"non-type template parameter type cannot be qualified\"" , "clang/lib/Sema/SemaTemplate.cpp", 7148, __extension__ __PRETTY_FUNCTION__ )); |
7149 | |
7150 | // FIXME: When Param is a reference, should we check that Arg is an lvalue? |
7151 | if (CTAK == CTAK_Deduced && |
7152 | (ParamType->isReferenceType() |
7153 | ? !Context.hasSameType(ParamType.getNonReferenceType(), |
7154 | Arg->getType()) |
7155 | : !Context.hasSameUnqualifiedType(ParamType, Arg->getType()))) { |
7156 | // FIXME: If either type is dependent, we skip the check. This isn't |
7157 | // correct, since during deduction we're supposed to have replaced each |
7158 | // template parameter with some unique (non-dependent) placeholder. |
7159 | // FIXME: If the argument type contains 'auto', we carry on and fail the |
7160 | // type check in order to force specific types to be more specialized than |
7161 | // 'auto'. It's not clear how partial ordering with 'auto' is supposed to |
7162 | // work. Similarly for CTAD, when comparing 'A<x>' against 'A'. |
7163 | if ((ParamType->isDependentType() || Arg->isTypeDependent()) && |
7164 | !Arg->getType()->getContainedDeducedType()) { |
7165 | SugaredConverted = TemplateArgument(Arg); |
7166 | CanonicalConverted = TemplateArgument( |
7167 | Context.getCanonicalTemplateArgument(SugaredConverted)); |
7168 | return Arg; |
7169 | } |
7170 | // FIXME: This attempts to implement C++ [temp.deduct.type]p17. Per DR1770, |
7171 | // we should actually be checking the type of the template argument in P, |
7172 | // not the type of the template argument deduced from A, against the |
7173 | // template parameter type. |
7174 | Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch) |
7175 | << Arg->getType() |
7176 | << ParamType.getUnqualifiedType(); |
7177 | Diag(Param->getLocation(), diag::note_template_param_here); |
7178 | return ExprError(); |
7179 | } |
7180 | |
7181 | // If either the parameter has a dependent type or the argument is |
7182 | // type-dependent, there's nothing we can check now. |
7183 | if (ParamType->isDependentType() || Arg->isTypeDependent()) { |
7184 | // Force the argument to the type of the parameter to maintain invariants. |
7185 | auto *PE = dyn_cast<PackExpansionExpr>(Arg); |
7186 | if (PE) |
7187 | Arg = PE->getPattern(); |
7188 | ExprResult E = ImpCastExprToType( |
7189 | Arg, ParamType.getNonLValueExprType(Context), CK_Dependent, |
7190 | ParamType->isLValueReferenceType() ? VK_LValue |
7191 | : ParamType->isRValueReferenceType() ? VK_XValue |
7192 | : VK_PRValue); |
7193 | if (E.isInvalid()) |
7194 | return ExprError(); |
7195 | if (PE) { |
7196 | // Recreate a pack expansion if we unwrapped one. |
7197 | E = new (Context) |
7198 | PackExpansionExpr(E.get()->getType(), E.get(), PE->getEllipsisLoc(), |
7199 | PE->getNumExpansions()); |
7200 | } |
7201 | SugaredConverted = TemplateArgument(E.get()); |
7202 | CanonicalConverted = TemplateArgument( |
7203 | Context.getCanonicalTemplateArgument(SugaredConverted)); |
7204 | return E; |
7205 | } |
7206 | |
7207 | // The initialization of the parameter from the argument is |
7208 | // a constant-evaluated context. |
7209 | EnterExpressionEvaluationContext ConstantEvaluated( |
7210 | *this, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
7211 | |
7212 | if (getLangOpts().CPlusPlus17) { |
7213 | QualType CanonParamType = Context.getCanonicalType(ParamType); |
7214 | |
7215 | // Avoid making a copy when initializing a template parameter of class type |
7216 | // from a template parameter object of the same type. This is going beyond |
7217 | // the standard, but is required for soundness: in |
7218 | // template<A a> struct X { X *p; X<a> *q; }; |
7219 | // ... we need p and q to have the same type. |
7220 | // |
7221 | // Similarly, don't inject a call to a copy constructor when initializing |
7222 | // from a template parameter of the same type. |
7223 | Expr *InnerArg = Arg->IgnoreParenImpCasts(); |
7224 | if (ParamType->isRecordType() && isa<DeclRefExpr>(InnerArg) && |
7225 | Context.hasSameUnqualifiedType(ParamType, InnerArg->getType())) { |
7226 | NamedDecl *ND = cast<DeclRefExpr>(InnerArg)->getDecl(); |
7227 | if (auto *TPO = dyn_cast<TemplateParamObjectDecl>(ND)) { |
7228 | |
7229 | SugaredConverted = TemplateArgument(TPO, ParamType); |
7230 | CanonicalConverted = |
7231 | TemplateArgument(TPO->getCanonicalDecl(), CanonParamType); |
7232 | return Arg; |
7233 | } |
7234 | if (isa<NonTypeTemplateParmDecl>(ND)) { |
7235 | SugaredConverted = TemplateArgument(Arg); |
7236 | CanonicalConverted = |
7237 | Context.getCanonicalTemplateArgument(SugaredConverted); |
7238 | return Arg; |
7239 | } |
7240 | } |
7241 | |
7242 | // C++17 [temp.arg.nontype]p1: |
7243 | // A template-argument for a non-type template parameter shall be |
7244 | // a converted constant expression of the type of the template-parameter. |
7245 | APValue Value; |
7246 | ExprResult ArgResult = CheckConvertedConstantExpression( |
7247 | Arg, ParamType, Value, CCEK_TemplateArg, Param); |
7248 | if (ArgResult.isInvalid()) |
7249 | return ExprError(); |
7250 | |
7251 | // For a value-dependent argument, CheckConvertedConstantExpression is |
7252 | // permitted (and expected) to be unable to determine a value. |
7253 | if (ArgResult.get()->isValueDependent()) { |
7254 | SugaredConverted = TemplateArgument(ArgResult.get()); |
7255 | CanonicalConverted = |
7256 | Context.getCanonicalTemplateArgument(SugaredConverted); |
7257 | return ArgResult; |
7258 | } |
7259 | |
7260 | // Convert the APValue to a TemplateArgument. |
7261 | switch (Value.getKind()) { |
7262 | case APValue::None: |
7263 | assert(ParamType->isNullPtrType())(static_cast <bool> (ParamType->isNullPtrType()) ? void (0) : __assert_fail ("ParamType->isNullPtrType()", "clang/lib/Sema/SemaTemplate.cpp" , 7263, __extension__ __PRETTY_FUNCTION__)); |
7264 | SugaredConverted = TemplateArgument(ParamType, /*isNullPtr=*/true); |
7265 | CanonicalConverted = TemplateArgument(CanonParamType, /*isNullPtr=*/true); |
7266 | break; |
7267 | case APValue::Indeterminate: |
7268 | llvm_unreachable("result of constant evaluation should be initialized")::llvm::llvm_unreachable_internal("result of constant evaluation should be initialized" , "clang/lib/Sema/SemaTemplate.cpp", 7268); |
7269 | break; |
7270 | case APValue::Int: |
7271 | assert(ParamType->isIntegralOrEnumerationType())(static_cast <bool> (ParamType->isIntegralOrEnumerationType ()) ? void (0) : __assert_fail ("ParamType->isIntegralOrEnumerationType()" , "clang/lib/Sema/SemaTemplate.cpp", 7271, __extension__ __PRETTY_FUNCTION__ )); |
7272 | SugaredConverted = TemplateArgument(Context, Value.getInt(), ParamType); |
7273 | CanonicalConverted = |
7274 | TemplateArgument(Context, Value.getInt(), CanonParamType); |
7275 | break; |
7276 | case APValue::MemberPointer: { |
7277 | assert(ParamType->isMemberPointerType())(static_cast <bool> (ParamType->isMemberPointerType( )) ? void (0) : __assert_fail ("ParamType->isMemberPointerType()" , "clang/lib/Sema/SemaTemplate.cpp", 7277, __extension__ __PRETTY_FUNCTION__ )); |
7278 | |
7279 | // FIXME: We need TemplateArgument representation and mangling for these. |
7280 | if (!Value.getMemberPointerPath().empty()) { |
7281 | Diag(Arg->getBeginLoc(), |
7282 | diag::err_template_arg_member_ptr_base_derived_not_supported) |
7283 | << Value.getMemberPointerDecl() << ParamType |
7284 | << Arg->getSourceRange(); |
7285 | return ExprError(); |
7286 | } |
7287 | |
7288 | auto *VD = const_cast<ValueDecl*>(Value.getMemberPointerDecl()); |
7289 | SugaredConverted = VD ? TemplateArgument(VD, ParamType) |
7290 | : TemplateArgument(ParamType, /*isNullPtr=*/true); |
7291 | CanonicalConverted = |
7292 | VD ? TemplateArgument(cast<ValueDecl>(VD->getCanonicalDecl()), |
7293 | CanonParamType) |
7294 | : TemplateArgument(CanonParamType, /*isNullPtr=*/true); |
7295 | break; |
7296 | } |
7297 | case APValue::LValue: { |
7298 | // For a non-type template-parameter of pointer or reference type, |
7299 | // the value of the constant expression shall not refer to |
7300 | assert(ParamType->isPointerType() || ParamType->isReferenceType() ||(static_cast <bool> (ParamType->isPointerType() || ParamType ->isReferenceType() || ParamType->isNullPtrType()) ? void (0) : __assert_fail ("ParamType->isPointerType() || ParamType->isReferenceType() || ParamType->isNullPtrType()" , "clang/lib/Sema/SemaTemplate.cpp", 7301, __extension__ __PRETTY_FUNCTION__ )) |
7301 | ParamType->isNullPtrType())(static_cast <bool> (ParamType->isPointerType() || ParamType ->isReferenceType() || ParamType->isNullPtrType()) ? void (0) : __assert_fail ("ParamType->isPointerType() || ParamType->isReferenceType() || ParamType->isNullPtrType()" , "clang/lib/Sema/SemaTemplate.cpp", 7301, __extension__ __PRETTY_FUNCTION__ )); |
7302 | // -- a temporary object |
7303 | // -- a string literal |
7304 | // -- the result of a typeid expression, or |
7305 | // -- a predefined __func__ variable |
7306 | APValue::LValueBase Base = Value.getLValueBase(); |
7307 | auto *VD = const_cast<ValueDecl *>(Base.dyn_cast<const ValueDecl *>()); |
7308 | if (Base && |
7309 | (!VD || |
7310 | isa<LifetimeExtendedTemporaryDecl, UnnamedGlobalConstantDecl>(VD))) { |
7311 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) |
7312 | << Arg->getSourceRange(); |
7313 | return ExprError(); |
7314 | } |
7315 | // -- a subobject |
7316 | // FIXME: Until C++20 |
7317 | if (Value.hasLValuePath() && Value.getLValuePath().size() == 1 && |
7318 | VD && VD->getType()->isArrayType() && |
7319 | Value.getLValuePath()[0].getAsArrayIndex() == 0 && |
7320 | !Value.isLValueOnePastTheEnd() && ParamType->isPointerType()) { |
7321 | // Per defect report (no number yet): |
7322 | // ... other than a pointer to the first element of a complete array |
7323 | // object. |
7324 | } else if (!Value.hasLValuePath() || Value.getLValuePath().size() || |
7325 | Value.isLValueOnePastTheEnd()) { |
7326 | Diag(StartLoc, diag::err_non_type_template_arg_subobject) |
7327 | << Value.getAsString(Context, ParamType); |
7328 | return ExprError(); |
7329 | } |
7330 | assert((VD || !ParamType->isReferenceType()) &&(static_cast <bool> ((VD || !ParamType->isReferenceType ()) && "null reference should not be a constant expression" ) ? void (0) : __assert_fail ("(VD || !ParamType->isReferenceType()) && \"null reference should not be a constant expression\"" , "clang/lib/Sema/SemaTemplate.cpp", 7331, __extension__ __PRETTY_FUNCTION__ )) |
7331 | "null reference should not be a constant expression")(static_cast <bool> ((VD || !ParamType->isReferenceType ()) && "null reference should not be a constant expression" ) ? void (0) : __assert_fail ("(VD || !ParamType->isReferenceType()) && \"null reference should not be a constant expression\"" , "clang/lib/Sema/SemaTemplate.cpp", 7331, __extension__ __PRETTY_FUNCTION__ )); |
7332 | assert((!VD || !ParamType->isNullPtrType()) &&(static_cast <bool> ((!VD || !ParamType->isNullPtrType ()) && "non-null value of type nullptr_t?") ? void (0 ) : __assert_fail ("(!VD || !ParamType->isNullPtrType()) && \"non-null value of type nullptr_t?\"" , "clang/lib/Sema/SemaTemplate.cpp", 7333, __extension__ __PRETTY_FUNCTION__ )) |
7333 | "non-null value of type nullptr_t?")(static_cast <bool> ((!VD || !ParamType->isNullPtrType ()) && "non-null value of type nullptr_t?") ? void (0 ) : __assert_fail ("(!VD || !ParamType->isNullPtrType()) && \"non-null value of type nullptr_t?\"" , "clang/lib/Sema/SemaTemplate.cpp", 7333, __extension__ __PRETTY_FUNCTION__ )); |
7334 | |
7335 | SugaredConverted = VD ? TemplateArgument(VD, ParamType) |
7336 | : TemplateArgument(ParamType, /*isNullPtr=*/true); |
7337 | CanonicalConverted = |
7338 | VD ? TemplateArgument(cast<ValueDecl>(VD->getCanonicalDecl()), |
7339 | CanonParamType) |
7340 | : TemplateArgument(CanonParamType, /*isNullPtr=*/true); |
7341 | break; |
7342 | } |
7343 | case APValue::Struct: |
7344 | case APValue::Union: { |
7345 | // Get or create the corresponding template parameter object. |
7346 | TemplateParamObjectDecl *D = |
7347 | Context.getTemplateParamObjectDecl(ParamType, Value); |
7348 | SugaredConverted = TemplateArgument(D, ParamType); |
7349 | CanonicalConverted = |
7350 | TemplateArgument(D->getCanonicalDecl(), CanonParamType); |
7351 | break; |
7352 | } |
7353 | case APValue::AddrLabelDiff: |
7354 | return Diag(StartLoc, diag::err_non_type_template_arg_addr_label_diff); |
7355 | case APValue::FixedPoint: |
7356 | case APValue::Float: |
7357 | case APValue::ComplexInt: |
7358 | case APValue::ComplexFloat: |
7359 | case APValue::Vector: |
7360 | case APValue::Array: |
7361 | return Diag(StartLoc, diag::err_non_type_template_arg_unsupported) |
7362 | << ParamType; |
7363 | } |
7364 | |
7365 | return ArgResult.get(); |
7366 | } |
7367 | |
7368 | // C++ [temp.arg.nontype]p5: |
7369 | // The following conversions are performed on each expression used |
7370 | // as a non-type template-argument. If a non-type |
7371 | // template-argument cannot be converted to the type of the |
7372 | // corresponding template-parameter then the program is |
7373 | // ill-formed. |
7374 | if (ParamType->isIntegralOrEnumerationType()) { |
7375 | // C++11: |
7376 | // -- for a non-type template-parameter of integral or |
7377 | // enumeration type, conversions permitted in a converted |
7378 | // constant expression are applied. |
7379 | // |
7380 | // C++98: |
7381 | // -- for a non-type template-parameter of integral or |
7382 | // enumeration type, integral promotions (4.5) and integral |
7383 | // conversions (4.7) are applied. |
7384 | |
7385 | if (getLangOpts().CPlusPlus11) { |
7386 | // C++ [temp.arg.nontype]p1: |
7387 | // A template-argument for a non-type, non-template template-parameter |
7388 | // shall be one of: |
7389 | // |
7390 | // -- for a non-type template-parameter of integral or enumeration |
7391 | // type, a converted constant expression of the type of the |
7392 | // template-parameter; or |
7393 | llvm::APSInt Value; |
7394 | ExprResult ArgResult = |
7395 | CheckConvertedConstantExpression(Arg, ParamType, Value, |
7396 | CCEK_TemplateArg); |
7397 | if (ArgResult.isInvalid()) |
7398 | return ExprError(); |
7399 | |
7400 | // We can't check arbitrary value-dependent arguments. |
7401 | if (ArgResult.get()->isValueDependent()) { |
7402 | SugaredConverted = TemplateArgument(ArgResult.get()); |
7403 | CanonicalConverted = |
7404 | Context.getCanonicalTemplateArgument(SugaredConverted); |
7405 | return ArgResult; |
7406 | } |
7407 | |
7408 | // Widen the argument value to sizeof(parameter type). This is almost |
7409 | // always a no-op, except when the parameter type is bool. In |
7410 | // that case, this may extend the argument from 1 bit to 8 bits. |
7411 | QualType IntegerType = ParamType; |
7412 | if (const EnumType *Enum = IntegerType->getAs<EnumType>()) |
7413 | IntegerType = Enum->getDecl()->getIntegerType(); |
7414 | Value = Value.extOrTrunc(IntegerType->isBitIntType() |
7415 | ? Context.getIntWidth(IntegerType) |
7416 | : Context.getTypeSize(IntegerType)); |
7417 | |
7418 | SugaredConverted = TemplateArgument(Context, Value, ParamType); |
7419 | CanonicalConverted = |
7420 | TemplateArgument(Context, Value, Context.getCanonicalType(ParamType)); |
7421 | return ArgResult; |
7422 | } |
7423 | |
7424 | ExprResult ArgResult = DefaultLvalueConversion(Arg); |
7425 | if (ArgResult.isInvalid()) |
7426 | return ExprError(); |
7427 | Arg = ArgResult.get(); |
7428 | |
7429 | QualType ArgType = Arg->getType(); |
7430 | |
7431 | // C++ [temp.arg.nontype]p1: |
7432 | // A template-argument for a non-type, non-template |
7433 | // template-parameter shall be one of: |
7434 | // |
7435 | // -- an integral constant-expression of integral or enumeration |
7436 | // type; or |
7437 | // -- the name of a non-type template-parameter; or |
7438 | llvm::APSInt Value; |
7439 | if (!ArgType->isIntegralOrEnumerationType()) { |
7440 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_integral_or_enumeral) |
7441 | << ArgType << Arg->getSourceRange(); |
7442 | Diag(Param->getLocation(), diag::note_template_param_here); |
7443 | return ExprError(); |
7444 | } else if (!Arg->isValueDependent()) { |
7445 | class TmplArgICEDiagnoser : public VerifyICEDiagnoser { |
7446 | QualType T; |
7447 | |
7448 | public: |
7449 | TmplArgICEDiagnoser(QualType T) : T(T) { } |
7450 | |
7451 | SemaDiagnosticBuilder diagnoseNotICE(Sema &S, |
7452 | SourceLocation Loc) override { |
7453 | return S.Diag(Loc, diag::err_template_arg_not_ice) << T; |
7454 | } |
7455 | } Diagnoser(ArgType); |
7456 | |
7457 | Arg = VerifyIntegerConstantExpression(Arg, &Value, Diagnoser).get(); |
7458 | if (!Arg) |
7459 | return ExprError(); |
7460 | } |
7461 | |
7462 | // From here on out, all we care about is the unqualified form |
7463 | // of the argument type. |
7464 | ArgType = ArgType.getUnqualifiedType(); |
7465 | |
7466 | // Try to convert the argument to the parameter's type. |
7467 | if (Context.hasSameType(ParamType, ArgType)) { |
7468 | // Okay: no conversion necessary |
7469 | } else if (ParamType->isBooleanType()) { |
7470 | // This is an integral-to-boolean conversion. |
7471 | Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).get(); |
7472 | } else if (IsIntegralPromotion(Arg, ArgType, ParamType) || |
7473 | !ParamType->isEnumeralType()) { |
7474 | // This is an integral promotion or conversion. |
7475 | Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).get(); |
7476 | } else { |
7477 | // We can't perform this conversion. |
7478 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible) |
7479 | << Arg->getType() << ParamType << Arg->getSourceRange(); |
7480 | Diag(Param->getLocation(), diag::note_template_param_here); |
7481 | return ExprError(); |
7482 | } |
7483 | |
7484 | // Add the value of this argument to the list of converted |
7485 | // arguments. We use the bitwidth and signedness of the template |
7486 | // parameter. |
7487 | if (Arg->isValueDependent()) { |
7488 | // The argument is value-dependent. Create a new |
7489 | // TemplateArgument with the converted expression. |
7490 | SugaredConverted = TemplateArgument(Arg); |
7491 | CanonicalConverted = |
7492 | Context.getCanonicalTemplateArgument(SugaredConverted); |
7493 | return Arg; |
7494 | } |
7495 | |
7496 | QualType IntegerType = ParamType; |
7497 | if (const EnumType *Enum = IntegerType->getAs<EnumType>()) { |
7498 | IntegerType = Enum->getDecl()->getIntegerType(); |
7499 | } |
7500 | |
7501 | if (ParamType->isBooleanType()) { |
7502 | // Value must be zero or one. |
7503 | Value = Value != 0; |
7504 | unsigned AllowedBits = Context.getTypeSize(IntegerType); |
7505 | if (Value.getBitWidth() != AllowedBits) |
7506 | Value = Value.extOrTrunc(AllowedBits); |
7507 | Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); |
7508 | } else { |
7509 | llvm::APSInt OldValue = Value; |
7510 | |
7511 | // Coerce the template argument's value to the value it will have |
7512 | // based on the template parameter's type. |
7513 | unsigned AllowedBits = IntegerType->isBitIntType() |
7514 | ? Context.getIntWidth(IntegerType) |
7515 | : Context.getTypeSize(IntegerType); |
7516 | if (Value.getBitWidth() != AllowedBits) |
7517 | Value = Value.extOrTrunc(AllowedBits); |
7518 | Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); |
7519 | |
7520 | // Complain if an unsigned parameter received a negative value. |
7521 | if (IntegerType->isUnsignedIntegerOrEnumerationType() && |
7522 | (OldValue.isSigned() && OldValue.isNegative())) { |
7523 | Diag(Arg->getBeginLoc(), diag::warn_template_arg_negative) |
7524 | << toString(OldValue, 10) << toString(Value, 10) << Param->getType() |
7525 | << Arg->getSourceRange(); |
7526 | Diag(Param->getLocation(), diag::note_template_param_here); |
7527 | } |
7528 | |
7529 | // Complain if we overflowed the template parameter's type. |
7530 | unsigned RequiredBits; |
7531 | if (IntegerType->isUnsignedIntegerOrEnumerationType()) |
7532 | RequiredBits = OldValue.getActiveBits(); |
7533 | else if (OldValue.isUnsigned()) |
7534 | RequiredBits = OldValue.getActiveBits() + 1; |
7535 | else |
7536 | RequiredBits = OldValue.getSignificantBits(); |
7537 | if (RequiredBits > AllowedBits) { |
7538 | Diag(Arg->getBeginLoc(), diag::warn_template_arg_too_large) |
7539 | << toString(OldValue, 10) << toString(Value, 10) << Param->getType() |
7540 | << Arg->getSourceRange(); |
7541 | Diag(Param->getLocation(), diag::note_template_param_here); |
7542 | } |
7543 | } |
7544 | |
7545 | QualType T = ParamType->isEnumeralType() ? ParamType : IntegerType; |
7546 | SugaredConverted = TemplateArgument(Context, Value, T); |
7547 | CanonicalConverted = |
7548 | TemplateArgument(Context, Value, Context.getCanonicalType(T)); |
7549 | return Arg; |
7550 | } |
7551 | |
7552 | QualType ArgType = Arg->getType(); |
7553 | DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction |
7554 | |
7555 | // Handle pointer-to-function, reference-to-function, and |
7556 | // pointer-to-member-function all in (roughly) the same way. |
7557 | if (// -- For a non-type template-parameter of type pointer to |
7558 | // function, only the function-to-pointer conversion (4.3) is |
7559 | // applied. If the template-argument represents a set of |
7560 | // overloaded functions (or a pointer to such), the matching |
7561 | // function is selected from the set (13.4). |
7562 | (ParamType->isPointerType() && |
7563 | ParamType->castAs<PointerType>()->getPointeeType()->isFunctionType()) || |
7564 | // -- For a non-type template-parameter of type reference to |
7565 | // function, no conversions apply. If the template-argument |
7566 | // represents a set of overloaded functions, the matching |
7567 | // function is selected from the set (13.4). |
7568 | (ParamType->isReferenceType() && |
7569 | ParamType->castAs<ReferenceType>()->getPointeeType()->isFunctionType()) || |
7570 | // -- For a non-type template-parameter of type pointer to |
7571 | // member function, no conversions apply. If the |
7572 | // template-argument represents a set of overloaded member |
7573 | // functions, the matching member function is selected from |
7574 | // the set (13.4). |
7575 | (ParamType->isMemberPointerType() && |
7576 | ParamType->castAs<MemberPointerType>()->getPointeeType() |
7577 | ->isFunctionType())) { |
7578 | |
7579 | if (Arg->getType() == Context.OverloadTy) { |
7580 | if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType, |
7581 | true, |
7582 | FoundResult)) { |
7583 | if (DiagnoseUseOfDecl(Fn, Arg->getBeginLoc())) |
7584 | return ExprError(); |
7585 | |
7586 | Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); |
7587 | ArgType = Arg->getType(); |
7588 | } else |
7589 | return ExprError(); |
7590 | } |
7591 | |
7592 | if (!ParamType->isMemberPointerType()) { |
7593 | if (CheckTemplateArgumentAddressOfObjectOrFunction( |
7594 | *this, Param, ParamType, Arg, SugaredConverted, |
7595 | CanonicalConverted)) |
7596 | return ExprError(); |
7597 | return Arg; |
7598 | } |
7599 | |
7600 | if (CheckTemplateArgumentPointerToMember( |
7601 | *this, Param, ParamType, Arg, SugaredConverted, CanonicalConverted)) |
7602 | return ExprError(); |
7603 | return Arg; |
7604 | } |
7605 | |
7606 | if (ParamType->isPointerType()) { |
7607 | // -- for a non-type template-parameter of type pointer to |
7608 | // object, qualification conversions (4.4) and the |
7609 | // array-to-pointer conversion (4.2) are applied. |
7610 | // C++0x also allows a value of std::nullptr_t. |
7611 | assert(ParamType->getPointeeType()->isIncompleteOrObjectType() &&(static_cast <bool> (ParamType->getPointeeType()-> isIncompleteOrObjectType() && "Only object pointers allowed here" ) ? void (0) : __assert_fail ("ParamType->getPointeeType()->isIncompleteOrObjectType() && \"Only object pointers allowed here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7612, __extension__ __PRETTY_FUNCTION__ )) |
7612 | "Only object pointers allowed here")(static_cast <bool> (ParamType->getPointeeType()-> isIncompleteOrObjectType() && "Only object pointers allowed here" ) ? void (0) : __assert_fail ("ParamType->getPointeeType()->isIncompleteOrObjectType() && \"Only object pointers allowed here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7612, __extension__ __PRETTY_FUNCTION__ )); |
7613 | |
7614 | if (CheckTemplateArgumentAddressOfObjectOrFunction( |
7615 | *this, Param, ParamType, Arg, SugaredConverted, CanonicalConverted)) |
7616 | return ExprError(); |
7617 | return Arg; |
7618 | } |
7619 | |
7620 | if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) { |
7621 | // -- For a non-type template-parameter of type reference to |
7622 | // object, no conversions apply. The type referred to by the |
7623 | // reference may be more cv-qualified than the (otherwise |
7624 | // identical) type of the template-argument. The |
7625 | // template-parameter is bound directly to the |
7626 | // template-argument, which must be an lvalue. |
7627 | assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() &&(static_cast <bool> (ParamRefType->getPointeeType()-> isIncompleteOrObjectType() && "Only object references allowed here" ) ? void (0) : __assert_fail ("ParamRefType->getPointeeType()->isIncompleteOrObjectType() && \"Only object references allowed here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7628, __extension__ __PRETTY_FUNCTION__ )) |
7628 | "Only object references allowed here")(static_cast <bool> (ParamRefType->getPointeeType()-> isIncompleteOrObjectType() && "Only object references allowed here" ) ? void (0) : __assert_fail ("ParamRefType->getPointeeType()->isIncompleteOrObjectType() && \"Only object references allowed here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7628, __extension__ __PRETTY_FUNCTION__ )); |
7629 | |
7630 | if (Arg->getType() == Context.OverloadTy) { |
7631 | if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, |
7632 | ParamRefType->getPointeeType(), |
7633 | true, |
7634 | FoundResult)) { |
7635 | if (DiagnoseUseOfDecl(Fn, Arg->getBeginLoc())) |
7636 | return ExprError(); |
7637 | |
7638 | Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); |
7639 | ArgType = Arg->getType(); |
7640 | } else |
7641 | return ExprError(); |
7642 | } |
7643 | |
7644 | if (CheckTemplateArgumentAddressOfObjectOrFunction( |
7645 | *this, Param, ParamType, Arg, SugaredConverted, CanonicalConverted)) |
7646 | return ExprError(); |
7647 | return Arg; |
7648 | } |
7649 | |
7650 | // Deal with parameters of type std::nullptr_t. |
7651 | if (ParamType->isNullPtrType()) { |
7652 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { |
7653 | SugaredConverted = TemplateArgument(Arg); |
7654 | CanonicalConverted = |
7655 | Context.getCanonicalTemplateArgument(SugaredConverted); |
7656 | return Arg; |
7657 | } |
7658 | |
7659 | switch (isNullPointerValueTemplateArgument(*this, Param, ParamType, Arg)) { |
7660 | case NPV_NotNullPointer: |
7661 | Diag(Arg->getExprLoc(), diag::err_template_arg_not_convertible) |
7662 | << Arg->getType() << ParamType; |
7663 | Diag(Param->getLocation(), diag::note_template_param_here); |
7664 | return ExprError(); |
7665 | |
7666 | case NPV_Error: |
7667 | return ExprError(); |
7668 | |
7669 | case NPV_NullPointer: |
7670 | Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); |
7671 | SugaredConverted = TemplateArgument(ParamType, |
7672 | /*isNullPtr=*/true); |
7673 | CanonicalConverted = TemplateArgument(Context.getCanonicalType(ParamType), |
7674 | /*isNullPtr=*/true); |
7675 | return Arg; |
7676 | } |
7677 | } |
7678 | |
7679 | // -- For a non-type template-parameter of type pointer to data |
7680 | // member, qualification conversions (4.4) are applied. |
7681 | assert(ParamType->isMemberPointerType() && "Only pointers to members remain")(static_cast <bool> (ParamType->isMemberPointerType( ) && "Only pointers to members remain") ? void (0) : __assert_fail ("ParamType->isMemberPointerType() && \"Only pointers to members remain\"" , "clang/lib/Sema/SemaTemplate.cpp", 7681, __extension__ __PRETTY_FUNCTION__ )); |
7682 | |
7683 | if (CheckTemplateArgumentPointerToMember( |
7684 | *this, Param, ParamType, Arg, SugaredConverted, CanonicalConverted)) |
7685 | return ExprError(); |
7686 | return Arg; |
7687 | } |
7688 | |
7689 | static void DiagnoseTemplateParameterListArityMismatch( |
7690 | Sema &S, TemplateParameterList *New, TemplateParameterList *Old, |
7691 | Sema::TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc); |
7692 | |
7693 | /// Check a template argument against its corresponding |
7694 | /// template template parameter. |
7695 | /// |
7696 | /// This routine implements the semantics of C++ [temp.arg.template]. |
7697 | /// It returns true if an error occurred, and false otherwise. |
7698 | bool Sema::CheckTemplateTemplateArgument(TemplateTemplateParmDecl *Param, |
7699 | TemplateParameterList *Params, |
7700 | TemplateArgumentLoc &Arg) { |
7701 | TemplateName Name = Arg.getArgument().getAsTemplateOrTemplatePattern(); |
7702 | TemplateDecl *Template = Name.getAsTemplateDecl(); |
7703 | if (!Template) { |
7704 | // Any dependent template name is fine. |
7705 | assert(Name.isDependent() && "Non-dependent template isn't a declaration?")(static_cast <bool> (Name.isDependent() && "Non-dependent template isn't a declaration?" ) ? void (0) : __assert_fail ("Name.isDependent() && \"Non-dependent template isn't a declaration?\"" , "clang/lib/Sema/SemaTemplate.cpp", 7705, __extension__ __PRETTY_FUNCTION__ )); |
7706 | return false; |
7707 | } |
7708 | |
7709 | if (Template->isInvalidDecl()) |
7710 | return true; |
7711 | |
7712 | // C++0x [temp.arg.template]p1: |
7713 | // A template-argument for a template template-parameter shall be |
7714 | // the name of a class template or an alias template, expressed as an |
7715 | // id-expression. When the template-argument names a class template, only |
7716 | // primary class templates are considered when matching the |
7717 | // template template argument with the corresponding parameter; |
7718 | // partial specializations are not considered even if their |
7719 | // parameter lists match that of the template template parameter. |
7720 | // |
7721 | // Note that we also allow template template parameters here, which |
7722 | // will happen when we are dealing with, e.g., class template |
7723 | // partial specializations. |
7724 | if (!isa<ClassTemplateDecl>(Template) && |
7725 | !isa<TemplateTemplateParmDecl>(Template) && |
7726 | !isa<TypeAliasTemplateDecl>(Template) && |
7727 | !isa<BuiltinTemplateDecl>(Template)) { |
7728 | assert(isa<FunctionTemplateDecl>(Template) &&(static_cast <bool> (isa<FunctionTemplateDecl>(Template ) && "Only function templates are possible here") ? void (0) : __assert_fail ("isa<FunctionTemplateDecl>(Template) && \"Only function templates are possible here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7729, __extension__ __PRETTY_FUNCTION__ )) |
7729 | "Only function templates are possible here")(static_cast <bool> (isa<FunctionTemplateDecl>(Template ) && "Only function templates are possible here") ? void (0) : __assert_fail ("isa<FunctionTemplateDecl>(Template) && \"Only function templates are possible here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7729, __extension__ __PRETTY_FUNCTION__ )); |
7730 | Diag(Arg.getLocation(), diag::err_template_arg_not_valid_template); |
7731 | Diag(Template->getLocation(), diag::note_template_arg_refers_here_func) |
7732 | << Template; |
7733 | } |
7734 | |
7735 | // C++1z [temp.arg.template]p3: (DR 150) |
7736 | // A template-argument matches a template template-parameter P when P |
7737 | // is at least as specialized as the template-argument A. |
7738 | // FIXME: We should enable RelaxedTemplateTemplateArgs by default as it is a |
7739 | // defect report resolution from C++17 and shouldn't be introduced by |
7740 | // concepts. |
7741 | if (getLangOpts().RelaxedTemplateTemplateArgs) { |
7742 | // Quick check for the common case: |
7743 | // If P contains a parameter pack, then A [...] matches P if each of A's |
7744 | // template parameters matches the corresponding template parameter in |
7745 | // the template-parameter-list of P. |
7746 | if (TemplateParameterListsAreEqual( |
7747 | Template->getTemplateParameters(), Params, false, |
7748 | TPL_TemplateTemplateArgumentMatch, Arg.getLocation()) && |
7749 | // If the argument has no associated constraints, then the parameter is |
7750 | // definitely at least as specialized as the argument. |
7751 | // Otherwise - we need a more thorough check. |
7752 | !Template->hasAssociatedConstraints()) |
7753 | return false; |
7754 | |
7755 | if (isTemplateTemplateParameterAtLeastAsSpecializedAs(Params, Template, |
7756 | Arg.getLocation())) { |
7757 | // P2113 |
7758 | // C++20[temp.func.order]p2 |
7759 | // [...] If both deductions succeed, the partial ordering selects the |
7760 | // more constrained template (if one exists) as determined below. |
7761 | SmallVector<const Expr *, 3> ParamsAC, TemplateAC; |
7762 | Params->getAssociatedConstraints(ParamsAC); |
7763 | // C++2a[temp.arg.template]p3 |
7764 | // [...] In this comparison, if P is unconstrained, the constraints on A |
7765 | // are not considered. |
7766 | if (ParamsAC.empty()) |
7767 | return false; |
7768 | |
7769 | Template->getAssociatedConstraints(TemplateAC); |
7770 | |
7771 | bool IsParamAtLeastAsConstrained; |
7772 | if (IsAtLeastAsConstrained(Param, ParamsAC, Template, TemplateAC, |
7773 | IsParamAtLeastAsConstrained)) |
7774 | return true; |
7775 | if (!IsParamAtLeastAsConstrained) { |
7776 | Diag(Arg.getLocation(), |
7777 | diag::err_template_template_parameter_not_at_least_as_constrained) |
7778 | << Template << Param << Arg.getSourceRange(); |
7779 | Diag(Param->getLocation(), diag::note_entity_declared_at) << Param; |
7780 | Diag(Template->getLocation(), diag::note_entity_declared_at) |
7781 | << Template; |
7782 | MaybeEmitAmbiguousAtomicConstraintsDiagnostic(Param, ParamsAC, Template, |
7783 | TemplateAC); |
7784 | return true; |
7785 | } |
7786 | return false; |
7787 | } |
7788 | // FIXME: Produce better diagnostics for deduction failures. |
7789 | } |
7790 | |
7791 | return !TemplateParameterListsAreEqual(Template->getTemplateParameters(), |
7792 | Params, |
7793 | true, |
7794 | TPL_TemplateTemplateArgumentMatch, |
7795 | Arg.getLocation()); |
7796 | } |
7797 | |
7798 | /// Given a non-type template argument that refers to a |
7799 | /// declaration and the type of its corresponding non-type template |
7800 | /// parameter, produce an expression that properly refers to that |
7801 | /// declaration. |
7802 | ExprResult |
7803 | Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg, |
7804 | QualType ParamType, |
7805 | SourceLocation Loc) { |
7806 | // C++ [temp.param]p8: |
7807 | // |
7808 | // A non-type template-parameter of type "array of T" or |
7809 | // "function returning T" is adjusted to be of type "pointer to |
7810 | // T" or "pointer to function returning T", respectively. |
7811 | if (ParamType->isArrayType()) |
7812 | ParamType = Context.getArrayDecayedType(ParamType); |
7813 | else if (ParamType->isFunctionType()) |
7814 | ParamType = Context.getPointerType(ParamType); |
7815 | |
7816 | // For a NULL non-type template argument, return nullptr casted to the |
7817 | // parameter's type. |
7818 | if (Arg.getKind() == TemplateArgument::NullPtr) { |
7819 | return ImpCastExprToType( |
7820 | new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc), |
7821 | ParamType, |
7822 | ParamType->getAs<MemberPointerType>() |
7823 | ? CK_NullToMemberPointer |
7824 | : CK_NullToPointer); |
7825 | } |
7826 | assert(Arg.getKind() == TemplateArgument::Declaration &&(static_cast <bool> (Arg.getKind() == TemplateArgument:: Declaration && "Only declaration template arguments permitted here" ) ? void (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Declaration && \"Only declaration template arguments permitted here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7827, __extension__ __PRETTY_FUNCTION__ )) |
7827 | "Only declaration template arguments permitted here")(static_cast <bool> (Arg.getKind() == TemplateArgument:: Declaration && "Only declaration template arguments permitted here" ) ? void (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Declaration && \"Only declaration template arguments permitted here\"" , "clang/lib/Sema/SemaTemplate.cpp", 7827, __extension__ __PRETTY_FUNCTION__ )); |
7828 | |
7829 | ValueDecl *VD = Arg.getAsDecl(); |
7830 | |
7831 | CXXScopeSpec SS; |
7832 | if (ParamType->isMemberPointerType()) { |
7833 | // If this is a pointer to member, we need to use a qualified name to |
7834 | // form a suitable pointer-to-member constant. |
7835 | assert(VD->getDeclContext()->isRecord() &&(static_cast <bool> (VD->getDeclContext()->isRecord () && (isa<CXXMethodDecl>(VD) || isa<FieldDecl >(VD) || isa<IndirectFieldDecl>(VD))) ? void (0) : __assert_fail ("VD->getDeclContext()->isRecord() && (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))" , "clang/lib/Sema/SemaTemplate.cpp", 7837, __extension__ __PRETTY_FUNCTION__ )) |
7836 | (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD) ||(static_cast <bool> (VD->getDeclContext()->isRecord () && (isa<CXXMethodDecl>(VD) || isa<FieldDecl >(VD) || isa<IndirectFieldDecl>(VD))) ? void (0) : __assert_fail ("VD->getDeclContext()->isRecord() && (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))" , "clang/lib/Sema/SemaTemplate.cpp", 7837, __extension__ __PRETTY_FUNCTION__ )) |
7837 | isa<IndirectFieldDecl>(VD)))(static_cast <bool> (VD->getDeclContext()->isRecord () && (isa<CXXMethodDecl>(VD) || isa<FieldDecl >(VD) || isa<IndirectFieldDecl>(VD))) ? void (0) : __assert_fail ("VD->getDeclContext()->isRecord() && (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD) || isa<IndirectFieldDecl>(VD))" , "clang/lib/Sema/SemaTemplate.cpp", 7837, __extension__ __PRETTY_FUNCTION__ )); |
7838 | QualType ClassType |
7839 | = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext())); |
7840 | NestedNameSpecifier *Qualifier |
7841 | = NestedNameSpecifier::Create(Context, nullptr, false, |
7842 | ClassType.getTypePtr()); |
7843 | SS.MakeTrivial(Context, Qualifier, Loc); |
7844 | } |
7845 | |
7846 | ExprResult RefExpr = BuildDeclarationNameExpr( |
7847 | SS, DeclarationNameInfo(VD->getDeclName(), Loc), VD); |
7848 | if (RefExpr.isInvalid()) |
7849 | return ExprError(); |
7850 | |
7851 | // For a pointer, the argument declaration is the pointee. Take its address. |
7852 | QualType ElemT(RefExpr.get()->getType()->getArrayElementTypeNoTypeQual(), 0); |
7853 | if (ParamType->isPointerType() && !ElemT.isNull() && |
7854 | Context.hasSimilarType(ElemT, ParamType->getPointeeType())) { |
7855 | // Decay an array argument if we want a pointer to its first element. |
7856 | RefExpr = DefaultFunctionArrayConversion(RefExpr.get()); |
7857 | if (RefExpr.isInvalid()) |
7858 | return ExprError(); |
7859 | } else if (ParamType->isPointerType() || ParamType->isMemberPointerType()) { |
7860 | // For any other pointer, take the address (or form a pointer-to-member). |
7861 | RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get()); |
7862 | if (RefExpr.isInvalid()) |
7863 | return ExprError(); |
7864 | } else if (ParamType->isRecordType()) { |
7865 | assert(isa<TemplateParamObjectDecl>(VD) &&(static_cast <bool> (isa<TemplateParamObjectDecl> (VD) && "arg for class template param not a template parameter object" ) ? void (0) : __assert_fail ("isa<TemplateParamObjectDecl>(VD) && \"arg for class template param not a template parameter object\"" , "clang/lib/Sema/SemaTemplate.cpp", 7866, __extension__ __PRETTY_FUNCTION__ )) |
7866 | "arg for class template param not a template parameter object")(static_cast <bool> (isa<TemplateParamObjectDecl> (VD) && "arg for class template param not a template parameter object" ) ? void (0) : __assert_fail ("isa<TemplateParamObjectDecl>(VD) && \"arg for class template param not a template parameter object\"" , "clang/lib/Sema/SemaTemplate.cpp", 7866, __extension__ __PRETTY_FUNCTION__ )); |
7867 | // No conversions apply in this case. |
7868 | return RefExpr; |
7869 | } else { |
7870 | assert(ParamType->isReferenceType() &&(static_cast <bool> (ParamType->isReferenceType() && "unexpected type for decl template argument") ? void (0) : __assert_fail ("ParamType->isReferenceType() && \"unexpected type for decl template argument\"" , "clang/lib/Sema/SemaTemplate.cpp", 7871, __extension__ __PRETTY_FUNCTION__ )) |
7871 | "unexpected type for decl template argument")(static_cast <bool> (ParamType->isReferenceType() && "unexpected type for decl template argument") ? void (0) : __assert_fail ("ParamType->isReferenceType() && \"unexpected type for decl template argument\"" , "clang/lib/Sema/SemaTemplate.cpp", 7871, __extension__ __PRETTY_FUNCTION__ )); |
7872 | } |
7873 | |
7874 | // At this point we should have the right value category. |
7875 | assert(ParamType->isReferenceType() == RefExpr.get()->isLValue() &&(static_cast <bool> (ParamType->isReferenceType() == RefExpr.get()->isLValue() && "value kind mismatch for non-type template argument" ) ? void (0) : __assert_fail ("ParamType->isReferenceType() == RefExpr.get()->isLValue() && \"value kind mismatch for non-type template argument\"" , "clang/lib/Sema/SemaTemplate.cpp", 7876, __extension__ __PRETTY_FUNCTION__ )) |
7876 | "value kind mismatch for non-type template argument")(static_cast <bool> (ParamType->isReferenceType() == RefExpr.get()->isLValue() && "value kind mismatch for non-type template argument" ) ? void (0) : __assert_fail ("ParamType->isReferenceType() == RefExpr.get()->isLValue() && \"value kind mismatch for non-type template argument\"" , "clang/lib/Sema/SemaTemplate.cpp", 7876, __extension__ __PRETTY_FUNCTION__ )); |
7877 | |
7878 | // The type of the template parameter can differ from the type of the |
7879 | // argument in various ways; convert it now if necessary. |
7880 | QualType DestExprType = ParamType.getNonLValueExprType(Context); |
7881 | if (!Context.hasSameType(RefExpr.get()->getType(), DestExprType)) { |
7882 | CastKind CK; |
7883 | QualType Ignored; |
7884 | if (Context.hasSimilarType(RefExpr.get()->getType(), DestExprType) || |
7885 | IsFunctionConversion(RefExpr.get()->getType(), DestExprType, Ignored)) { |
7886 | CK = CK_NoOp; |
7887 | } else if (ParamType->isVoidPointerType() && |
7888 | RefExpr.get()->getType()->isPointerType()) { |
7889 | CK = CK_BitCast; |
7890 | } else { |
7891 | // FIXME: Pointers to members can need conversion derived-to-base or |
7892 | // base-to-derived conversions. We currently don't retain enough |
7893 | // information to convert properly (we need to track a cast path or |
7894 | // subobject number in the template argument). |
7895 | llvm_unreachable(::llvm::llvm_unreachable_internal("unexpected conversion required for non-type template argument" , "clang/lib/Sema/SemaTemplate.cpp", 7896) |
7896 | "unexpected conversion required for non-type template argument")::llvm::llvm_unreachable_internal("unexpected conversion required for non-type template argument" , "clang/lib/Sema/SemaTemplate.cpp", 7896); |
7897 | } |
7898 | RefExpr = ImpCastExprToType(RefExpr.get(), DestExprType, CK, |
7899 | RefExpr.get()->getValueKind()); |
7900 | } |
7901 | |
7902 | return RefExpr; |
7903 | } |
7904 | |
7905 | /// Construct a new expression that refers to the given |
7906 | /// integral template argument with the given source-location |
7907 | /// information. |
7908 | /// |
7909 | /// This routine takes care of the mapping from an integral template |
7910 | /// argument (which may have any integral type) to the appropriate |
7911 | /// literal value. |
7912 | ExprResult |
7913 | Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg, |
7914 | SourceLocation Loc) { |
7915 | assert(Arg.getKind() == TemplateArgument::Integral &&(static_cast <bool> (Arg.getKind() == TemplateArgument:: Integral && "Operation is only valid for integral template arguments" ) ? void (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Integral && \"Operation is only valid for integral template arguments\"" , "clang/lib/Sema/SemaTemplate.cpp", 7916, __extension__ __PRETTY_FUNCTION__ )) |
7916 | "Operation is only valid for integral template arguments")(static_cast <bool> (Arg.getKind() == TemplateArgument:: Integral && "Operation is only valid for integral template arguments" ) ? void (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Integral && \"Operation is only valid for integral template arguments\"" , "clang/lib/Sema/SemaTemplate.cpp", 7916, __extension__ __PRETTY_FUNCTION__ )); |
7917 | QualType OrigT = Arg.getIntegralType(); |
7918 | |
7919 | // If this is an enum type that we're instantiating, we need to use an integer |
7920 | // type the same size as the enumerator. We don't want to build an |
7921 | // IntegerLiteral with enum type. The integer type of an enum type can be of |
7922 | // any integral type with C++11 enum classes, make sure we create the right |
7923 | // type of literal for it. |
7924 | QualType T = OrigT; |
7925 | if (const EnumType *ET = OrigT->getAs<EnumType>()) |
7926 | T = ET->getDecl()->getIntegerType(); |
7927 | |
7928 | Expr *E; |
7929 | if (T->isAnyCharacterType()) { |
7930 | CharacterLiteral::CharacterKind Kind; |
7931 | if (T->isWideCharType()) |
7932 | Kind = CharacterLiteral::Wide; |
7933 | else if (T->isChar8Type() && getLangOpts().Char8) |
7934 | Kind = CharacterLiteral::UTF8; |
7935 | else if (T->isChar16Type()) |
7936 | Kind = CharacterLiteral::UTF16; |
7937 | else if (T->isChar32Type()) |
7938 | Kind = CharacterLiteral::UTF32; |
7939 | else |
7940 | Kind = CharacterLiteral::Ascii; |
7941 | |
7942 | E = new (Context) CharacterLiteral(Arg.getAsIntegral().getZExtValue(), |
7943 | Kind, T, Loc); |
7944 | } else if (T->isBooleanType()) { |
7945 | E = CXXBoolLiteralExpr::Create(Context, Arg.getAsIntegral().getBoolValue(), |
7946 | T, Loc); |
7947 | } else if (T->isNullPtrType()) { |
7948 | E = new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc); |
7949 | } else { |
7950 | E = IntegerLiteral::Create(Context, Arg.getAsIntegral(), T, Loc); |
7951 | } |
7952 | |
7953 | if (OrigT->isEnumeralType()) { |
7954 | // FIXME: This is a hack. We need a better way to handle substituted |
7955 | // non-type template parameters. |
7956 | E = CStyleCastExpr::Create(Context, OrigT, VK_PRValue, CK_IntegralCast, E, |
7957 | nullptr, CurFPFeatureOverrides(), |
7958 | Context.getTrivialTypeSourceInfo(OrigT, Loc), |
7959 | Loc, Loc); |
7960 | } |
7961 | |
7962 | return E; |
7963 | } |
7964 | |
7965 | /// Match two template parameters within template parameter lists. |
7966 | static bool MatchTemplateParameterKind( |
7967 | Sema &S, NamedDecl *New, const NamedDecl *NewInstFrom, NamedDecl *Old, |
7968 | const NamedDecl *OldInstFrom, bool Complain, |
7969 | Sema::TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc) { |
7970 | // Check the actual kind (type, non-type, template). |
7971 | if (Old->getKind() != New->getKind()) { |
7972 | if (Complain) { |
7973 | unsigned NextDiag = diag::err_template_param_different_kind; |
7974 | if (TemplateArgLoc.isValid()) { |
7975 | S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); |
7976 | NextDiag = diag::note_template_param_different_kind; |
7977 | } |
7978 | S.Diag(New->getLocation(), NextDiag) |
7979 | << (Kind != Sema::TPL_TemplateMatch); |
7980 | S.Diag(Old->getLocation(), diag::note_template_prev_declaration) |
7981 | << (Kind != Sema::TPL_TemplateMatch); |
7982 | } |
7983 | |
7984 | return false; |
7985 | } |
7986 | |
7987 | // Check that both are parameter packs or neither are parameter packs. |
7988 | // However, if we are matching a template template argument to a |
7989 | // template template parameter, the template template parameter can have |
7990 | // a parameter pack where the template template argument does not. |
7991 | if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() && |
7992 | !(Kind == Sema::TPL_TemplateTemplateArgumentMatch && |
7993 | Old->isTemplateParameterPack())) { |
7994 | if (Complain) { |
7995 | unsigned NextDiag = diag::err_template_parameter_pack_non_pack; |
7996 | if (TemplateArgLoc.isValid()) { |
7997 | S.Diag(TemplateArgLoc, |
7998 | diag::err_template_arg_template_params_mismatch); |
7999 | NextDiag = diag::note_template_parameter_pack_non_pack; |
8000 | } |
8001 | |
8002 | unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0 |
8003 | : isa<NonTypeTemplateParmDecl>(New)? 1 |
8004 | : 2; |
8005 | S.Diag(New->getLocation(), NextDiag) |
8006 | << ParamKind << New->isParameterPack(); |
8007 | S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here) |
8008 | << ParamKind << Old->isParameterPack(); |
8009 | } |
8010 | |
8011 | return false; |
8012 | } |
8013 | |
8014 | // For non-type template parameters, check the type of the parameter. |
8015 | if (NonTypeTemplateParmDecl *OldNTTP |
8016 | = dyn_cast<NonTypeTemplateParmDecl>(Old)) { |
8017 | NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New); |
8018 | |
8019 | // If we are matching a template template argument to a template |
8020 | // template parameter and one of the non-type template parameter types |
8021 | // is dependent, then we must wait until template instantiation time |
8022 | // to actually compare the arguments. |
8023 | if (Kind != Sema::TPL_TemplateTemplateArgumentMatch || |
8024 | (!OldNTTP->getType()->isDependentType() && |
8025 | !NewNTTP->getType()->isDependentType())) { |
8026 | // C++20 [temp.over.link]p6: |
8027 | // Two [non-type] template-parameters are equivalent [if] they have |
8028 | // equivalent types ignoring the use of type-constraints for |
8029 | // placeholder types |
8030 | QualType OldType = S.Context.getUnconstrainedType(OldNTTP->getType()); |
8031 | QualType NewType = S.Context.getUnconstrainedType(NewNTTP->getType()); |
8032 | if (!S.Context.hasSameType(OldType, NewType)) { |
8033 | if (Complain) { |
8034 | unsigned NextDiag = diag::err_template_nontype_parm_different_type; |
8035 | if (TemplateArgLoc.isValid()) { |
8036 | S.Diag(TemplateArgLoc, |
8037 | diag::err_template_arg_template_params_mismatch); |
8038 | NextDiag = diag::note_template_nontype_parm_different_type; |
8039 | } |
8040 | S.Diag(NewNTTP->getLocation(), NextDiag) |
8041 | << NewNTTP->getType() |
8042 | << (Kind != Sema::TPL_TemplateMatch); |
8043 | S.Diag(OldNTTP->getLocation(), |
8044 | diag::note_template_nontype_parm_prev_declaration) |
8045 | << OldNTTP->getType(); |
8046 | } |
8047 | |
8048 | return false; |
8049 | } |
8050 | } |
8051 | } |
8052 | // For template template parameters, check the template parameter types. |
8053 | // The template parameter lists of template template |
8054 | // parameters must agree. |
8055 | else if (TemplateTemplateParmDecl *OldTTP |
8056 | = dyn_cast<TemplateTemplateParmDecl>(Old)) { |
8057 | TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New); |
8058 | if (!S.TemplateParameterListsAreEqual( |
8059 | NewInstFrom, NewTTP->getTemplateParameters(), OldInstFrom, |
8060 | OldTTP->getTemplateParameters(), Complain, |
8061 | (Kind == Sema::TPL_TemplateMatch |
8062 | ? Sema::TPL_TemplateTemplateParmMatch |
8063 | : Kind), |
8064 | TemplateArgLoc)) |
8065 | return false; |
8066 | } |
8067 | |
8068 | if (Kind != Sema::TPL_TemplateParamsEquivalent && |
8069 | Kind != Sema::TPL_TemplateTemplateArgumentMatch && |
8070 | !isa<TemplateTemplateParmDecl>(Old)) { |
8071 | const Expr *NewC = nullptr, *OldC = nullptr; |
8072 | |
8073 | if (isa<TemplateTypeParmDecl>(New)) { |
8074 | if (const auto *TC = cast<TemplateTypeParmDecl>(New)->getTypeConstraint()) |
8075 | NewC = TC->getImmediatelyDeclaredConstraint(); |
8076 | if (const auto *TC = cast<TemplateTypeParmDecl>(Old)->getTypeConstraint()) |
8077 | OldC = TC->getImmediatelyDeclaredConstraint(); |
8078 | } else if (isa<NonTypeTemplateParmDecl>(New)) { |
8079 | if (const Expr *E = cast<NonTypeTemplateParmDecl>(New) |
8080 | ->getPlaceholderTypeConstraint()) |
8081 | NewC = E; |
8082 | if (const Expr *E = cast<NonTypeTemplateParmDecl>(Old) |
8083 | ->getPlaceholderTypeConstraint()) |
8084 | OldC = E; |
8085 | } else |
8086 | llvm_unreachable("unexpected template parameter type")::llvm::llvm_unreachable_internal("unexpected template parameter type" , "clang/lib/Sema/SemaTemplate.cpp", 8086); |
8087 | |
8088 | auto Diagnose = [&] { |
8089 | S.Diag(NewC ? NewC->getBeginLoc() : New->getBeginLoc(), |
8090 | diag::err_template_different_type_constraint); |
8091 | S.Diag(OldC ? OldC->getBeginLoc() : Old->getBeginLoc(), |
8092 | diag::note_template_prev_declaration) << /*declaration*/0; |
8093 | }; |
8094 | |
8095 | if (!NewC != !OldC) { |
8096 | if (Complain) |
8097 | Diagnose(); |
8098 | return false; |
8099 | } |
8100 | |
8101 | if (NewC) { |
8102 | if (!S.AreConstraintExpressionsEqual(OldInstFrom, OldC, NewInstFrom, |
8103 | NewC)) { |
8104 | if (Complain) |
8105 | Diagnose(); |
8106 | return false; |
8107 | } |
8108 | } |
8109 | } |
8110 | |
8111 | return true; |
8112 | } |
8113 | |
8114 | /// Diagnose a known arity mismatch when comparing template argument |
8115 | /// lists. |
8116 | static |
8117 | void DiagnoseTemplateParameterListArityMismatch(Sema &S, |
8118 | TemplateParameterList *New, |
8119 | TemplateParameterList *Old, |
8120 | Sema::TemplateParameterListEqualKind Kind, |
8121 | SourceLocation TemplateArgLoc) { |
8122 | unsigned NextDiag = diag::err_template_param_list_different_arity; |
8123 | if (TemplateArgLoc.isValid()) { |
8124 | S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); |
8125 | NextDiag = diag::note_template_param_list_different_arity; |
8126 | } |
8127 | S.Diag(New->getTemplateLoc(), NextDiag) |
8128 | << (New->size() > Old->size()) |
8129 | << (Kind != Sema::TPL_TemplateMatch) |
8130 | << SourceRange(New->getTemplateLoc(), New->getRAngleLoc()); |
8131 | S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration) |
8132 | << (Kind != Sema::TPL_TemplateMatch) |
8133 | << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc()); |
8134 | } |
8135 | |
8136 | /// Determine whether the given template parameter lists are |
8137 | /// equivalent. |
8138 | /// |
8139 | /// \param New The new template parameter list, typically written in the |
8140 | /// source code as part of a new template declaration. |
8141 | /// |
8142 | /// \param Old The old template parameter list, typically found via |
8143 | /// name lookup of the template declared with this template parameter |
8144 | /// list. |
8145 | /// |
8146 | /// \param Complain If true, this routine will produce a diagnostic if |
8147 | /// the template parameter lists are not equivalent. |
8148 | /// |
8149 | /// \param Kind describes how we are to match the template parameter lists. |
8150 | /// |
8151 | /// \param TemplateArgLoc If this source location is valid, then we |
8152 | /// are actually checking the template parameter list of a template |
8153 | /// argument (New) against the template parameter list of its |
8154 | /// corresponding template template parameter (Old). We produce |
8155 | /// slightly different diagnostics in this scenario. |
8156 | /// |
8157 | /// \returns True if the template parameter lists are equal, false |
8158 | /// otherwise. |
8159 | bool Sema::TemplateParameterListsAreEqual( |
8160 | const NamedDecl *NewInstFrom, TemplateParameterList *New, |
8161 | const NamedDecl *OldInstFrom, TemplateParameterList *Old, bool Complain, |
8162 | TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc) { |
8163 | if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) { |
8164 | if (Complain) |
8165 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
8166 | TemplateArgLoc); |
8167 | |
8168 | return false; |
8169 | } |
8170 | |
8171 | // C++0x [temp.arg.template]p3: |
8172 | // A template-argument matches a template template-parameter (call it P) |
8173 | // when each of the template parameters in the template-parameter-list of |
8174 | // the template-argument's corresponding class template or alias template |
8175 | // (call it A) matches the corresponding template parameter in the |
8176 | // template-parameter-list of P. [...] |
8177 | TemplateParameterList::iterator NewParm = New->begin(); |
8178 | TemplateParameterList::iterator NewParmEnd = New->end(); |
8179 | for (TemplateParameterList::iterator OldParm = Old->begin(), |
8180 | OldParmEnd = Old->end(); |
8181 | OldParm != OldParmEnd; ++OldParm) { |
8182 | if (Kind != TPL_TemplateTemplateArgumentMatch || |
8183 | !(*OldParm)->isTemplateParameterPack()) { |
8184 | if (NewParm == NewParmEnd) { |
8185 | if (Complain) |
8186 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
8187 | TemplateArgLoc); |
8188 | |
8189 | return false; |
8190 | } |
8191 | |
8192 | if (!MatchTemplateParameterKind(*this, *NewParm, NewInstFrom, *OldParm, |
8193 | OldInstFrom, Complain, Kind, |
8194 | TemplateArgLoc)) |
8195 | return false; |
8196 | |
8197 | ++NewParm; |
8198 | continue; |
8199 | } |
8200 | |
8201 | // C++0x [temp.arg.template]p3: |
8202 | // [...] When P's template- parameter-list contains a template parameter |
8203 | // pack (14.5.3), the template parameter pack will match zero or more |
8204 | // template parameters or template parameter packs in the |
8205 | // template-parameter-list of A with the same type and form as the |
8206 | // template parameter pack in P (ignoring whether those template |
8207 | // parameters are template parameter packs). |
8208 | for (; NewParm != NewParmEnd; ++NewParm) { |
8209 | if (!MatchTemplateParameterKind(*this, *NewParm, NewInstFrom, *OldParm, |
8210 | OldInstFrom, Complain, Kind, |
8211 | TemplateArgLoc)) |
8212 | return false; |
8213 | } |
8214 | } |
8215 | |
8216 | // Make sure we exhausted all of the arguments. |
8217 | if (NewParm != NewParmEnd) { |
8218 | if (Complain) |
8219 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, |
8220 | TemplateArgLoc); |
8221 | |
8222 | return false; |
8223 | } |
8224 | |
8225 | if (Kind != TPL_TemplateTemplateArgumentMatch && |
8226 | Kind != TPL_TemplateParamsEquivalent) { |
8227 | const Expr *NewRC = New->getRequiresClause(); |
8228 | const Expr *OldRC = Old->getRequiresClause(); |
8229 | |
8230 | auto Diagnose = [&] { |
8231 | Diag(NewRC ? NewRC->getBeginLoc() : New->getTemplateLoc(), |
8232 | diag::err_template_different_requires_clause); |
8233 | Diag(OldRC ? OldRC->getBeginLoc() : Old->getTemplateLoc(), |
8234 | diag::note_template_prev_declaration) << /*declaration*/0; |
8235 | }; |
8236 | |
8237 | if (!NewRC != !OldRC) { |
8238 | if (Complain) |
8239 | Diagnose(); |
8240 | return false; |
8241 | } |
8242 | |
8243 | if (NewRC) { |
8244 | if (!AreConstraintExpressionsEqual(OldInstFrom, OldRC, NewInstFrom, |
8245 | NewRC)) { |
8246 | if (Complain) |
8247 | Diagnose(); |
8248 | return false; |
8249 | } |
8250 | } |
8251 | } |
8252 | |
8253 | return true; |
8254 | } |
8255 | |
8256 | /// Check whether a template can be declared within this scope. |
8257 | /// |
8258 | /// If the template declaration is valid in this scope, returns |
8259 | /// false. Otherwise, issues a diagnostic and returns true. |
8260 | bool |
8261 | Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) { |
8262 | if (!S) |
8263 | return false; |
8264 | |
8265 | // Find the nearest enclosing declaration scope. |
8266 | while ((S->getFlags() & Scope::DeclScope) == 0 || |
8267 | (S->getFlags() & Scope::TemplateParamScope) != 0) |
8268 | S = S->getParent(); |
8269 | |
8270 | // C++ [temp.pre]p6: [P2096] |
8271 | // A template, explicit specialization, or partial specialization shall not |
8272 | // have C linkage. |
8273 | DeclContext *Ctx = S->getEntity(); |
8274 | if (Ctx && Ctx->isExternCContext()) { |
8275 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage) |
8276 | << TemplateParams->getSourceRange(); |
8277 | if (const LinkageSpecDecl *LSD = Ctx->getExternCContext()) |
8278 | Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here); |
8279 | return true; |
8280 | } |
8281 | Ctx = Ctx ? Ctx->getRedeclContext() : nullptr; |
8282 | |
8283 | // C++ [temp]p2: |
8284 | // A template-declaration can appear only as a namespace scope or |
8285 | // class scope declaration. |
8286 | // C++ [temp.expl.spec]p3: |
8287 | // An explicit specialization may be declared in any scope in which the |
8288 | // corresponding primary template may be defined. |
8289 | // C++ [temp.class.spec]p6: [P2096] |
8290 | // A partial specialization may be declared in any scope in which the |
8291 | // corresponding primary template may be defined. |
8292 | if (Ctx) { |
8293 | if (Ctx->isFileContext()) |
8294 | return false; |
8295 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Ctx)) { |
8296 | // C++ [temp.mem]p2: |
8297 | // A local class shall not have member templates. |
8298 | if (RD->isLocalClass()) |
8299 | return Diag(TemplateParams->getTemplateLoc(), |
8300 | diag::err_template_inside_local_class) |
8301 | << TemplateParams->getSourceRange(); |
8302 | else |
8303 | return false; |
8304 | } |
8305 | } |
8306 | |
8307 | return Diag(TemplateParams->getTemplateLoc(), |
8308 | diag::err_template_outside_namespace_or_class_scope) |
8309 | << TemplateParams->getSourceRange(); |
8310 | } |
8311 | |
8312 | /// Determine what kind of template specialization the given declaration |
8313 | /// is. |
8314 | static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D) { |
8315 | if (!D) |
8316 | return TSK_Undeclared; |
8317 | |
8318 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) |
8319 | return Record->getTemplateSpecializationKind(); |
8320 | if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) |
8321 | return Function->getTemplateSpecializationKind(); |
8322 | if (VarDecl *Var = dyn_cast<VarDecl>(D)) |
8323 | return Var->getTemplateSpecializationKind(); |
8324 | |
8325 | return TSK_Undeclared; |
8326 | } |
8327 | |
8328 | /// Check whether a specialization is well-formed in the current |
8329 | /// context. |
8330 | /// |
8331 | /// This routine determines whether a template specialization can be declared |
8332 | /// in the current context (C++ [temp.expl.spec]p2). |
8333 | /// |
8334 | /// \param S the semantic analysis object for which this check is being |
8335 | /// performed. |
8336 | /// |
8337 | /// \param Specialized the entity being specialized or instantiated, which |
8338 | /// may be a kind of template (class template, function template, etc.) or |
8339 | /// a member of a class template (member function, static data member, |
8340 | /// member class). |
8341 | /// |
8342 | /// \param PrevDecl the previous declaration of this entity, if any. |
8343 | /// |
8344 | /// \param Loc the location of the explicit specialization or instantiation of |
8345 | /// this entity. |
8346 | /// |
8347 | /// \param IsPartialSpecialization whether this is a partial specialization of |
8348 | /// a class template. |
8349 | /// |
8350 | /// \returns true if there was an error that we cannot recover from, false |
8351 | /// otherwise. |
8352 | static bool CheckTemplateSpecializationScope(Sema &S, |
8353 | NamedDecl *Specialized, |
8354 | NamedDecl *PrevDecl, |
8355 | SourceLocation Loc, |
8356 | bool IsPartialSpecialization) { |
8357 | // Keep these "kind" numbers in sync with the %select statements in the |
8358 | // various diagnostics emitted by this routine. |
8359 | int EntityKind = 0; |
8360 | if (isa<ClassTemplateDecl>(Specialized)) |
8361 | EntityKind = IsPartialSpecialization? 1 : 0; |
8362 | else if (isa<VarTemplateDecl>(Specialized)) |
8363 | EntityKind = IsPartialSpecialization ? 3 : 2; |
8364 | else if (isa<FunctionTemplateDecl>(Specialized)) |
8365 | EntityKind = 4; |
8366 | else if (isa<CXXMethodDecl>(Specialized)) |
8367 | EntityKind = 5; |
8368 | else if (isa<VarDecl>(Specialized)) |
8369 | EntityKind = 6; |
8370 | else if (isa<RecordDecl>(Specialized)) |
8371 | EntityKind = 7; |
8372 | else if (isa<EnumDecl>(Specialized) && S.getLangOpts().CPlusPlus11) |
8373 | EntityKind = 8; |
8374 | else { |
8375 | S.Diag(Loc, diag::err_template_spec_unknown_kind) |
8376 | << S.getLangOpts().CPlusPlus11; |
8377 | S.Diag(Specialized->getLocation(), diag::note_specialized_entity); |
8378 | return true; |
8379 | } |
8380 | |
8381 | // C++ [temp.expl.spec]p2: |
8382 | // An explicit specialization may be declared in any scope in which |
8383 | // the corresponding primary template may be defined. |
8384 | if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) { |
8385 | S.Diag(Loc, diag::err_template_spec_decl_function_scope) |
8386 | << Specialized; |
8387 | return true; |
8388 | } |
8389 | |
8390 | // C++ [temp.class.spec]p6: |
8391 | // A class template partial specialization may be declared in any |
8392 | // scope in which the primary template may be defined. |
8393 | DeclContext *SpecializedContext = |
8394 | Specialized->getDeclContext()->getRedeclContext(); |
8395 | DeclContext *DC = S.CurContext->getRedeclContext(); |
8396 | |
8397 | // Make sure that this redeclaration (or definition) occurs in the same |
8398 | // scope or an enclosing namespace. |
8399 | if (!(DC->isFileContext() ? DC->Encloses(SpecializedContext) |
8400 | : DC->Equals(SpecializedContext))) { |
8401 | if (isa<TranslationUnitDecl>(SpecializedContext)) |
8402 | S.Diag(Loc, diag::err_template_spec_redecl_global_scope) |
8403 | << EntityKind << Specialized; |
8404 | else { |
8405 | auto *ND = cast<NamedDecl>(SpecializedContext); |
8406 | int Diag = diag::err_template_spec_redecl_out_of_scope; |
8407 | if (S.getLangOpts().MicrosoftExt && !DC->isRecord()) |
8408 | Diag = diag::ext_ms_template_spec_redecl_out_of_scope; |
8409 | S.Diag(Loc, Diag) << EntityKind << Specialized |
8410 | << ND << isa<CXXRecordDecl>(ND); |
8411 | } |
8412 | |
8413 | S.Diag(Specialized->getLocation(), diag::note_specialized_entity); |
8414 | |
8415 | // Don't allow specializing in the wrong class during error recovery. |
8416 | // Otherwise, things can go horribly wrong. |
8417 | if (DC->isRecord()) |
8418 | return true; |
8419 | } |
8420 | |
8421 | return false; |
8422 | } |
8423 | |
8424 | static SourceRange findTemplateParameterInType(unsigned Depth, Expr *E) { |
8425 | if (!E->isTypeDependent()) |
8426 | return SourceLocation(); |
8427 | DependencyChecker Checker(Depth, /*IgnoreNonTypeDependent*/true); |
8428 | Checker.TraverseStmt(E); |
8429 | if (Checker.MatchLoc.isInvalid()) |
8430 | return E->getSourceRange(); |
8431 | return Checker.MatchLoc; |
8432 | } |
8433 | |
8434 | static SourceRange findTemplateParameter(unsigned Depth, TypeLoc TL) { |
8435 | if (!TL.getType()->isDependentType()) |
8436 | return SourceLocation(); |
8437 | DependencyChecker Checker(Depth, /*IgnoreNonTypeDependent*/true); |
8438 | Checker.TraverseTypeLoc(TL); |
8439 | if (Checker.MatchLoc.isInvalid()) |
8440 | return TL.getSourceRange(); |
8441 | return Checker.MatchLoc; |
8442 | } |
8443 | |
8444 | /// Subroutine of Sema::CheckTemplatePartialSpecializationArgs |
8445 | /// that checks non-type template partial specialization arguments. |
8446 | static bool CheckNonTypeTemplatePartialSpecializationArgs( |
8447 | Sema &S, SourceLocation TemplateNameLoc, NonTypeTemplateParmDecl *Param, |
8448 | const TemplateArgument *Args, unsigned NumArgs, bool IsDefaultArgument) { |
8449 | for (unsigned I = 0; I != NumArgs; ++I) { |
8450 | if (Args[I].getKind() == TemplateArgument::Pack) { |
8451 | if (CheckNonTypeTemplatePartialSpecializationArgs( |
8452 | S, TemplateNameLoc, Param, Args[I].pack_begin(), |
8453 | Args[I].pack_size(), IsDefaultArgument)) |
8454 | return true; |
8455 | |
8456 | continue; |
8457 | } |
8458 | |
8459 | if (Args[I].getKind() != TemplateArgument::Expression) |
8460 | continue; |
8461 | |
8462 | Expr *ArgExpr = Args[I].getAsExpr(); |
8463 | |
8464 | // We can have a pack expansion of any of the bullets below. |
8465 | if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr)) |
8466 | ArgExpr = Expansion->getPattern(); |
8467 | |
8468 | // Strip off any implicit casts we added as part of type checking. |
8469 | while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) |
8470 | ArgExpr = ICE->getSubExpr(); |
8471 | |
8472 | // C++ [temp.class.spec]p8: |
8473 | // A non-type argument is non-specialized if it is the name of a |
8474 | // non-type parameter. All other non-type arguments are |
8475 | // specialized. |
8476 | // |
8477 | // Below, we check the two conditions that only apply to |
8478 | // specialized non-type arguments, so skip any non-specialized |
8479 | // arguments. |
8480 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr)) |
8481 | if (isa<NonTypeTemplateParmDecl>(DRE->getDecl())) |
8482 | continue; |
8483 | |
8484 | // C++ [temp.class.spec]p9: |
8485 | // Within the argument list of a class template partial |
8486 | // specialization, the following restrictions apply: |
8487 | // -- A partially specialized non-type argument expression |
8488 | // shall not involve a template parameter of the partial |
8489 | // specialization except when the argument expression is a |
8490 | // simple identifier. |
8491 | // -- The type of a template parameter corresponding to a |
8492 | // specialized non-type argument shall not be dependent on a |
8493 | // parameter of the specialization. |
8494 | // DR1315 removes the first bullet, leaving an incoherent set of rules. |
8495 | // We implement a compromise between the original rules and DR1315: |
8496 | // -- A specialized non-type template argument shall not be |
8497 | // type-dependent and the corresponding template parameter |
8498 | // shall have a non-dependent type. |
8499 | SourceRange ParamUseRange = |
8500 | findTemplateParameterInType(Param->getDepth(), ArgExpr); |
8501 | if (ParamUseRange.isValid()) { |
8502 | if (IsDefaultArgument) { |
8503 | S.Diag(TemplateNameLoc, |
8504 | diag::err_dependent_non_type_arg_in_partial_spec); |
8505 | S.Diag(ParamUseRange.getBegin(), |
8506 | diag::note_dependent_non_type_default_arg_in_partial_spec) |
8507 | << ParamUseRange; |
8508 | } else { |
8509 | S.Diag(ParamUseRange.getBegin(), |
8510 | diag::err_dependent_non_type_arg_in_partial_spec) |
8511 | << ParamUseRange; |
8512 | } |
8513 | return true; |
8514 | } |
8515 | |
8516 | ParamUseRange = findTemplateParameter( |
8517 | Param->getDepth(), Param->getTypeSourceInfo()->getTypeLoc()); |
8518 | if (ParamUseRange.isValid()) { |
8519 | S.Diag(IsDefaultArgument ? TemplateNameLoc : ArgExpr->getBeginLoc(), |
8520 | diag::err_dependent_typed_non_type_arg_in_partial_spec) |
8521 | << Param->getType(); |
8522 | S.Diag(Param->getLocation(), diag::note_template_param_here) |
8523 | << (IsDefaultArgument ? ParamUseRange : SourceRange()) |
8524 | << ParamUseRange; |
8525 | return true; |
8526 | } |
8527 | } |
8528 | |
8529 | return false; |
8530 | } |
8531 | |
8532 | /// Check the non-type template arguments of a class template |
8533 | /// partial specialization according to C++ [temp.class.spec]p9. |
8534 | /// |
8535 | /// \param TemplateNameLoc the location of the template name. |
8536 | /// \param PrimaryTemplate the template parameters of the primary class |
8537 | /// template. |
8538 | /// \param NumExplicit the number of explicitly-specified template arguments. |
8539 | /// \param TemplateArgs the template arguments of the class template |
8540 | /// partial specialization. |
8541 | /// |
8542 | /// \returns \c true if there was an error, \c false otherwise. |
8543 | bool Sema::CheckTemplatePartialSpecializationArgs( |
8544 | SourceLocation TemplateNameLoc, TemplateDecl *PrimaryTemplate, |
8545 | unsigned NumExplicit, ArrayRef<TemplateArgument> TemplateArgs) { |
8546 | // We have to be conservative when checking a template in a dependent |
8547 | // context. |
8548 | if (PrimaryTemplate->getDeclContext()->isDependentContext()) |
8549 | return false; |
8550 | |
8551 | TemplateParameterList *TemplateParams = |
8552 | PrimaryTemplate->getTemplateParameters(); |
8553 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { |
8554 | NonTypeTemplateParmDecl *Param |
8555 | = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I)); |
8556 | if (!Param) |
8557 | continue; |
8558 | |
8559 | if (CheckNonTypeTemplatePartialSpecializationArgs(*this, TemplateNameLoc, |
8560 | Param, &TemplateArgs[I], |
8561 | 1, I >= NumExplicit)) |
8562 | return true; |
8563 | } |
8564 | |
8565 | return false; |
8566 | } |
8567 | |
8568 | DeclResult Sema::ActOnClassTemplateSpecialization( |
8569 | Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc, |
8570 | SourceLocation ModulePrivateLoc, CXXScopeSpec &SS, |
8571 | TemplateIdAnnotation &TemplateId, const ParsedAttributesView &Attr, |
8572 | MultiTemplateParamsArg TemplateParameterLists, SkipBodyInfo *SkipBody) { |
8573 | assert(TUK != TUK_Reference && "References are not specializations")(static_cast <bool> (TUK != TUK_Reference && "References are not specializations" ) ? void (0) : __assert_fail ("TUK != TUK_Reference && \"References are not specializations\"" , "clang/lib/Sema/SemaTemplate.cpp", 8573, __extension__ __PRETTY_FUNCTION__ )); |
8574 | |
8575 | // NOTE: KWLoc is the location of the tag keyword. This will instead |
8576 | // store the location of the outermost template keyword in the declaration. |
8577 | SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0 |
8578 | ? TemplateParameterLists[0]->getTemplateLoc() : KWLoc; |
8579 | SourceLocation TemplateNameLoc = TemplateId.TemplateNameLoc; |
8580 | SourceLocation LAngleLoc = TemplateId.LAngleLoc; |
8581 | SourceLocation RAngleLoc = TemplateId.RAngleLoc; |
8582 | |
8583 | // Find the class template we're specializing |
8584 | TemplateName Name = TemplateId.Template.get(); |
8585 | ClassTemplateDecl *ClassTemplate |
8586 | = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl()); |
8587 | |
8588 | if (!ClassTemplate) { |
8589 | Diag(TemplateNameLoc, diag::err_not_class_template_specialization) |
8590 | << (Name.getAsTemplateDecl() && |
8591 | isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())); |
8592 | return true; |
8593 | } |
8594 | |
8595 | bool isMemberSpecialization = false; |
8596 | bool isPartialSpecialization = false; |
8597 | |
8598 | // Check the validity of the template headers that introduce this |
8599 | // template. |
8600 | // FIXME: We probably shouldn't complain about these headers for |
8601 | // friend declarations. |
8602 | bool Invalid = false; |
8603 | TemplateParameterList *TemplateParams = |
8604 | MatchTemplateParametersToScopeSpecifier( |
8605 | KWLoc, TemplateNameLoc, SS, &TemplateId, |
8606 | TemplateParameterLists, TUK == TUK_Friend, isMemberSpecialization, |
8607 | Invalid); |
8608 | if (Invalid) |
8609 | return true; |
8610 | |
8611 | // Check that we can declare a template specialization here. |
8612 | if (TemplateParams && CheckTemplateDeclScope(S, TemplateParams)) |
8613 | return true; |
8614 | |
8615 | if (TemplateParams && TemplateParams->size() > 0) { |
8616 | isPartialSpecialization = true; |
8617 | |
8618 | if (TUK == TUK_Friend) { |
8619 | Diag(KWLoc, diag::err_partial_specialization_friend) |
8620 | << SourceRange(LAngleLoc, RAngleLoc); |
8621 | return true; |
8622 | } |
8623 | |
8624 | // C++ [temp.class.spec]p10: |
8625 | // The template parameter list of a specialization shall not |
8626 | // contain default template argument values. |
8627 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { |
8628 | Decl *Param = TemplateParams->getParam(I); |
8629 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) { |
8630 | if (TTP->hasDefaultArgument()) { |
8631 | Diag(TTP->getDefaultArgumentLoc(), |
8632 | diag::err_default_arg_in_partial_spec); |
8633 | TTP->removeDefaultArgument(); |
8634 | } |
8635 | } else if (NonTypeTemplateParmDecl *NTTP |
8636 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
8637 | if (Expr *DefArg = NTTP->getDefaultArgument()) { |
8638 | Diag(NTTP->getDefaultArgumentLoc(), |
8639 | diag::err_default_arg_in_partial_spec) |
8640 | << DefArg->getSourceRange(); |
8641 | NTTP->removeDefaultArgument(); |
8642 | } |
8643 | } else { |
8644 | TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param); |
8645 | if (TTP->hasDefaultArgument()) { |
8646 | Diag(TTP->getDefaultArgument().getLocation(), |
8647 | diag::err_default_arg_in_partial_spec) |
8648 | << TTP->getDefaultArgument().getSourceRange(); |
8649 | TTP->removeDefaultArgument(); |
8650 | } |
8651 | } |
8652 | } |
8653 | } else if (TemplateParams) { |
8654 | if (TUK == TUK_Friend) |
8655 | Diag(KWLoc, diag::err_template_spec_friend) |
8656 | << FixItHint::CreateRemoval( |
8657 | SourceRange(TemplateParams->getTemplateLoc(), |
8658 | TemplateParams->getRAngleLoc())) |
8659 | << SourceRange(LAngleLoc, RAngleLoc); |
8660 | } else { |
8661 | assert(TUK == TUK_Friend && "should have a 'template<>' for this decl")(static_cast <bool> (TUK == TUK_Friend && "should have a 'template<>' for this decl" ) ? void (0) : __assert_fail ("TUK == TUK_Friend && \"should have a 'template<>' for this decl\"" , "clang/lib/Sema/SemaTemplate.cpp", 8661, __extension__ __PRETTY_FUNCTION__ )); |
8662 | } |
8663 | |
8664 | // Check that the specialization uses the same tag kind as the |
8665 | // original template. |
8666 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
8667 | assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!")(static_cast <bool> (Kind != TTK_Enum && "Invalid enum tag in class template spec!" ) ? void (0) : __assert_fail ("Kind != TTK_Enum && \"Invalid enum tag in class template spec!\"" , "clang/lib/Sema/SemaTemplate.cpp", 8667, __extension__ __PRETTY_FUNCTION__ )); |
8668 | if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), |
8669 | Kind, TUK == TUK_Definition, KWLoc, |
8670 | ClassTemplate->getIdentifier())) { |
8671 | Diag(KWLoc, diag::err_use_with_wrong_tag) |
8672 | << ClassTemplate |
8673 | << FixItHint::CreateReplacement(KWLoc, |
8674 | ClassTemplate->getTemplatedDecl()->getKindName()); |
8675 | Diag(ClassTemplate->getTemplatedDecl()->getLocation(), |
8676 | diag::note_previous_use); |
8677 | Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); |
8678 | } |
8679 | |
8680 | // Translate the parser's template argument list in our AST format. |
8681 | TemplateArgumentListInfo TemplateArgs = |
8682 | makeTemplateArgumentListInfo(*this, TemplateId); |
8683 | |
8684 | // Check for unexpanded parameter packs in any of the template arguments. |
8685 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
8686 | if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], |
8687 | UPPC_PartialSpecialization)) |
8688 | return true; |
8689 | |
8690 | // Check that the template argument list is well-formed for this |
8691 | // template. |
8692 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
8693 | if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, TemplateArgs, |
8694 | false, SugaredConverted, CanonicalConverted, |
8695 | /*UpdateArgsWithConversions=*/true)) |
8696 | return true; |
8697 | |
8698 | // Find the class template (partial) specialization declaration that |
8699 | // corresponds to these arguments. |
8700 | if (isPartialSpecialization) { |
8701 | if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, ClassTemplate, |
8702 | TemplateArgs.size(), |
8703 | CanonicalConverted)) |
8704 | return true; |
8705 | |
8706 | // FIXME: Move this to CheckTemplatePartialSpecializationArgs so we |
8707 | // also do it during instantiation. |
8708 | if (!Name.isDependent() && |
8709 | !TemplateSpecializationType::anyDependentTemplateArguments( |
8710 | TemplateArgs, CanonicalConverted)) { |
8711 | Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) |
8712 | << ClassTemplate->getDeclName(); |
8713 | isPartialSpecialization = false; |
8714 | } |
8715 | } |
8716 | |
8717 | void *InsertPos = nullptr; |
8718 | ClassTemplateSpecializationDecl *PrevDecl = nullptr; |
8719 | |
8720 | if (isPartialSpecialization) |
8721 | PrevDecl = ClassTemplate->findPartialSpecialization( |
8722 | CanonicalConverted, TemplateParams, InsertPos); |
8723 | else |
8724 | PrevDecl = ClassTemplate->findSpecialization(CanonicalConverted, InsertPos); |
8725 | |
8726 | ClassTemplateSpecializationDecl *Specialization = nullptr; |
8727 | |
8728 | // Check whether we can declare a class template specialization in |
8729 | // the current scope. |
8730 | if (TUK != TUK_Friend && |
8731 | CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl, |
8732 | TemplateNameLoc, |
8733 | isPartialSpecialization)) |
8734 | return true; |
8735 | |
8736 | // The canonical type |
8737 | QualType CanonType; |
8738 | if (isPartialSpecialization) { |
8739 | // Build the canonical type that describes the converted template |
8740 | // arguments of the class template partial specialization. |
8741 | TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); |
8742 | CanonType = Context.getTemplateSpecializationType(CanonTemplate, |
8743 | CanonicalConverted); |
8744 | |
8745 | if (Context.hasSameType(CanonType, |
8746 | ClassTemplate->getInjectedClassNameSpecialization()) && |
8747 | (!Context.getLangOpts().CPlusPlus20 || |
8748 | !TemplateParams->hasAssociatedConstraints())) { |
8749 | // C++ [temp.class.spec]p9b3: |
8750 | // |
8751 | // -- The argument list of the specialization shall not be identical |
8752 | // to the implicit argument list of the primary template. |
8753 | // |
8754 | // This rule has since been removed, because it's redundant given DR1495, |
8755 | // but we keep it because it produces better diagnostics and recovery. |
8756 | Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) |
8757 | << /*class template*/0 << (TUK == TUK_Definition) |
8758 | << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); |
8759 | return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS, |
8760 | ClassTemplate->getIdentifier(), |
8761 | TemplateNameLoc, |
8762 | Attr, |
8763 | TemplateParams, |
8764 | AS_none, /*ModulePrivateLoc=*/SourceLocation(), |
8765 | /*FriendLoc*/SourceLocation(), |
8766 | TemplateParameterLists.size() - 1, |
8767 | TemplateParameterLists.data()); |
8768 | } |
8769 | |
8770 | // Create a new class template partial specialization declaration node. |
8771 | ClassTemplatePartialSpecializationDecl *PrevPartial |
8772 | = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl); |
8773 | ClassTemplatePartialSpecializationDecl *Partial = |
8774 | ClassTemplatePartialSpecializationDecl::Create( |
8775 | Context, Kind, ClassTemplate->getDeclContext(), KWLoc, |
8776 | TemplateNameLoc, TemplateParams, ClassTemplate, CanonicalConverted, |
8777 | TemplateArgs, CanonType, PrevPartial); |
8778 | SetNestedNameSpecifier(*this, Partial, SS); |
8779 | if (TemplateParameterLists.size() > 1 && SS.isSet()) { |
8780 | Partial->setTemplateParameterListsInfo( |
8781 | Context, TemplateParameterLists.drop_back(1)); |
8782 | } |
8783 | |
8784 | if (!PrevPartial) |
8785 | ClassTemplate->AddPartialSpecialization(Partial, InsertPos); |
8786 | Specialization = Partial; |
8787 | |
8788 | // If we are providing an explicit specialization of a member class |
8789 | // template specialization, make a note of that. |
8790 | if (PrevPartial && PrevPartial->getInstantiatedFromMember()) |
8791 | PrevPartial->setMemberSpecialization(); |
8792 | |
8793 | CheckTemplatePartialSpecialization(Partial); |
8794 | } else { |
8795 | // Create a new class template specialization declaration node for |
8796 | // this explicit specialization or friend declaration. |
8797 | Specialization = ClassTemplateSpecializationDecl::Create( |
8798 | Context, Kind, ClassTemplate->getDeclContext(), KWLoc, TemplateNameLoc, |
8799 | ClassTemplate, CanonicalConverted, PrevDecl); |
8800 | SetNestedNameSpecifier(*this, Specialization, SS); |
8801 | if (TemplateParameterLists.size() > 0) { |
8802 | Specialization->setTemplateParameterListsInfo(Context, |
8803 | TemplateParameterLists); |
8804 | } |
8805 | |
8806 | if (!PrevDecl) |
8807 | ClassTemplate->AddSpecialization(Specialization, InsertPos); |
8808 | |
8809 | if (CurContext->isDependentContext()) { |
8810 | TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); |
8811 | CanonType = Context.getTemplateSpecializationType(CanonTemplate, |
8812 | CanonicalConverted); |
8813 | } else { |
8814 | CanonType = Context.getTypeDeclType(Specialization); |
8815 | } |
8816 | } |
8817 | |
8818 | // C++ [temp.expl.spec]p6: |
8819 | // If a template, a member template or the member of a class template is |
8820 | // explicitly specialized then that specialization shall be declared |
8821 | // before the first use of that specialization that would cause an implicit |
8822 | // instantiation to take place, in every translation unit in which such a |
8823 | // use occurs; no diagnostic is required. |
8824 | if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { |
8825 | bool Okay = false; |
8826 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
8827 | // Is there any previous explicit specialization declaration? |
8828 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
8829 | Okay = true; |
8830 | break; |
8831 | } |
8832 | } |
8833 | |
8834 | if (!Okay) { |
8835 | SourceRange Range(TemplateNameLoc, RAngleLoc); |
8836 | Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) |
8837 | << Context.getTypeDeclType(Specialization) << Range; |
8838 | |
8839 | Diag(PrevDecl->getPointOfInstantiation(), |
8840 | diag::note_instantiation_required_here) |
8841 | << (PrevDecl->getTemplateSpecializationKind() |
8842 | != TSK_ImplicitInstantiation); |
8843 | return true; |
8844 | } |
8845 | } |
8846 | |
8847 | // If this is not a friend, note that this is an explicit specialization. |
8848 | if (TUK != TUK_Friend) |
8849 | Specialization->setSpecializationKind(TSK_ExplicitSpecialization); |
8850 | |
8851 | // Check that this isn't a redefinition of this specialization. |
8852 | if (TUK == TUK_Definition) { |
8853 | RecordDecl *Def = Specialization->getDefinition(); |
8854 | NamedDecl *Hidden = nullptr; |
8855 | if (Def && SkipBody && !hasVisibleDefinition(Def, &Hidden)) { |
8856 | SkipBody->ShouldSkip = true; |
8857 | SkipBody->Previous = Def; |
8858 | makeMergedDefinitionVisible(Hidden); |
8859 | } else if (Def) { |
8860 | SourceRange Range(TemplateNameLoc, RAngleLoc); |
8861 | Diag(TemplateNameLoc, diag::err_redefinition) << Specialization << Range; |
8862 | Diag(Def->getLocation(), diag::note_previous_definition); |
8863 | Specialization->setInvalidDecl(); |
8864 | return true; |
8865 | } |
8866 | } |
8867 | |
8868 | ProcessDeclAttributeList(S, Specialization, Attr); |
8869 | |
8870 | // Add alignment attributes if necessary; these attributes are checked when |
8871 | // the ASTContext lays out the structure. |
8872 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { |
8873 | AddAlignmentAttributesForRecord(Specialization); |
8874 | AddMsStructLayoutForRecord(Specialization); |
8875 | } |
8876 | |
8877 | if (ModulePrivateLoc.isValid()) |
8878 | Diag(Specialization->getLocation(), diag::err_module_private_specialization) |
8879 | << (isPartialSpecialization? 1 : 0) |
8880 | << FixItHint::CreateRemoval(ModulePrivateLoc); |
8881 | |
8882 | // Build the fully-sugared type for this class template |
8883 | // specialization as the user wrote in the specialization |
8884 | // itself. This means that we'll pretty-print the type retrieved |
8885 | // from the specialization's declaration the way that the user |
8886 | // actually wrote the specialization, rather than formatting the |
8887 | // name based on the "canonical" representation used to store the |
8888 | // template arguments in the specialization. |
8889 | TypeSourceInfo *WrittenTy |
8890 | = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, |
8891 | TemplateArgs, CanonType); |
8892 | if (TUK != TUK_Friend) { |
8893 | Specialization->setTypeAsWritten(WrittenTy); |
8894 | Specialization->setTemplateKeywordLoc(TemplateKWLoc); |
8895 | } |
8896 | |
8897 | // C++ [temp.expl.spec]p9: |
8898 | // A template explicit specialization is in the scope of the |
8899 | // namespace in which the template was defined. |
8900 | // |
8901 | // We actually implement this paragraph where we set the semantic |
8902 | // context (in the creation of the ClassTemplateSpecializationDecl), |
8903 | // but we also maintain the lexical context where the actual |
8904 | // definition occurs. |
8905 | Specialization->setLexicalDeclContext(CurContext); |
8906 | |
8907 | // We may be starting the definition of this specialization. |
8908 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) |
8909 | Specialization->startDefinition(); |
8910 | |
8911 | if (TUK == TUK_Friend) { |
8912 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, |
8913 | TemplateNameLoc, |
8914 | WrittenTy, |
8915 | /*FIXME:*/KWLoc); |
8916 | Friend->setAccess(AS_public); |
8917 | CurContext->addDecl(Friend); |
8918 | } else { |
8919 | // Add the specialization into its lexical context, so that it can |
8920 | // be seen when iterating through the list of declarations in that |
8921 | // context. However, specializations are not found by name lookup. |
8922 | CurContext->addDecl(Specialization); |
8923 | } |
8924 | |
8925 | if (SkipBody && SkipBody->ShouldSkip) |
8926 | return SkipBody->Previous; |
8927 | |
8928 | return Specialization; |
8929 | } |
8930 | |
8931 | Decl *Sema::ActOnTemplateDeclarator(Scope *S, |
8932 | MultiTemplateParamsArg TemplateParameterLists, |
8933 | Declarator &D) { |
8934 | Decl *NewDecl = HandleDeclarator(S, D, TemplateParameterLists); |
8935 | ActOnDocumentableDecl(NewDecl); |
8936 | return NewDecl; |
8937 | } |
8938 | |
8939 | Decl *Sema::ActOnConceptDefinition(Scope *S, |
8940 | MultiTemplateParamsArg TemplateParameterLists, |
8941 | IdentifierInfo *Name, SourceLocation NameLoc, |
8942 | Expr *ConstraintExpr) { |
8943 | DeclContext *DC = CurContext; |
8944 | |
8945 | if (!DC->getRedeclContext()->isFileContext()) { |
8946 | Diag(NameLoc, |
8947 | diag::err_concept_decls_may_only_appear_in_global_namespace_scope); |
8948 | return nullptr; |
8949 | } |
8950 | |
8951 | if (TemplateParameterLists.size() > 1) { |
8952 | Diag(NameLoc, diag::err_concept_extra_headers); |
8953 | return nullptr; |
8954 | } |
8955 | |
8956 | TemplateParameterList *Params = TemplateParameterLists.front(); |
8957 | |
8958 | if (Params->size() == 0) { |
8959 | Diag(NameLoc, diag::err_concept_no_parameters); |
8960 | return nullptr; |
8961 | } |
8962 | |
8963 | // Ensure that the parameter pack, if present, is the last parameter in the |
8964 | // template. |
8965 | for (TemplateParameterList::const_iterator ParamIt = Params->begin(), |
8966 | ParamEnd = Params->end(); |
8967 | ParamIt != ParamEnd; ++ParamIt) { |
8968 | Decl const *Param = *ParamIt; |
8969 | if (Param->isParameterPack()) { |
8970 | if (++ParamIt == ParamEnd) |
8971 | break; |
8972 | Diag(Param->getLocation(), |
8973 | diag::err_template_param_pack_must_be_last_template_parameter); |
8974 | return nullptr; |
8975 | } |
8976 | } |
8977 | |
8978 | if (DiagnoseUnexpandedParameterPack(ConstraintExpr)) |
8979 | return nullptr; |
8980 | |
8981 | ConceptDecl *NewDecl = |
8982 | ConceptDecl::Create(Context, DC, NameLoc, Name, Params, ConstraintExpr); |
8983 | |
8984 | if (NewDecl->hasAssociatedConstraints()) { |
8985 | // C++2a [temp.concept]p4: |
8986 | // A concept shall not have associated constraints. |
8987 | Diag(NameLoc, diag::err_concept_no_associated_constraints); |
8988 | NewDecl->setInvalidDecl(); |
8989 | } |
8990 | |
8991 | // Check for conflicting previous declaration. |
8992 | DeclarationNameInfo NameInfo(NewDecl->getDeclName(), NameLoc); |
8993 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName, |
8994 | forRedeclarationInCurContext()); |
8995 | LookupName(Previous, S); |
8996 | FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage=*/false, |
8997 | /*AllowInlineNamespace*/false); |
8998 | bool AddToScope = true; |
8999 | CheckConceptRedefinition(NewDecl, Previous, AddToScope); |
9000 | |
9001 | ActOnDocumentableDecl(NewDecl); |
9002 | if (AddToScope) |
9003 | PushOnScopeChains(NewDecl, S); |
9004 | return NewDecl; |
9005 | } |
9006 | |
9007 | void Sema::CheckConceptRedefinition(ConceptDecl *NewDecl, |
9008 | LookupResult &Previous, bool &AddToScope) { |
9009 | AddToScope = true; |
9010 | |
9011 | if (Previous.empty()) |
9012 | return; |
9013 | |
9014 | auto *OldConcept = dyn_cast<ConceptDecl>(Previous.getRepresentativeDecl()->getUnderlyingDecl()); |
9015 | if (!OldConcept) { |
9016 | auto *Old = Previous.getRepresentativeDecl(); |
9017 | Diag(NewDecl->getLocation(), diag::err_redefinition_different_kind) |
9018 | << NewDecl->getDeclName(); |
9019 | notePreviousDefinition(Old, NewDecl->getLocation()); |
9020 | AddToScope = false; |
9021 | return; |
9022 | } |
9023 | // Check if we can merge with a concept declaration. |
9024 | bool IsSame = Context.isSameEntity(NewDecl, OldConcept); |
9025 | if (!IsSame) { |
9026 | Diag(NewDecl->getLocation(), diag::err_redefinition_different_concept) |
9027 | << NewDecl->getDeclName(); |
9028 | notePreviousDefinition(OldConcept, NewDecl->getLocation()); |
9029 | AddToScope = false; |
9030 | return; |
9031 | } |
9032 | if (hasReachableDefinition(OldConcept) && |
9033 | IsRedefinitionInModule(NewDecl, OldConcept)) { |
9034 | Diag(NewDecl->getLocation(), diag::err_redefinition) |
9035 | << NewDecl->getDeclName(); |
9036 | notePreviousDefinition(OldConcept, NewDecl->getLocation()); |
9037 | AddToScope = false; |
9038 | return; |
9039 | } |
9040 | if (!Previous.isSingleResult()) { |
9041 | // FIXME: we should produce an error in case of ambig and failed lookups. |
9042 | // Other decls (e.g. namespaces) also have this shortcoming. |
9043 | return; |
9044 | } |
9045 | // We unwrap canonical decl late to check for module visibility. |
9046 | Context.setPrimaryMergedDecl(NewDecl, OldConcept->getCanonicalDecl()); |
9047 | } |
9048 | |
9049 | /// \brief Strips various properties off an implicit instantiation |
9050 | /// that has just been explicitly specialized. |
9051 | static void StripImplicitInstantiation(NamedDecl *D, bool MinGW) { |
9052 | if (MinGW || (isa<FunctionDecl>(D) && |
9053 | cast<FunctionDecl>(D)->isFunctionTemplateSpecialization())) { |
9054 | D->dropAttr<DLLImportAttr>(); |
9055 | D->dropAttr<DLLExportAttr>(); |
9056 | } |
9057 | |
9058 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) |
9059 | FD->setInlineSpecified(false); |
9060 | } |
9061 | |
9062 | /// Compute the diagnostic location for an explicit instantiation |
9063 | // declaration or definition. |
9064 | static SourceLocation DiagLocForExplicitInstantiation( |
9065 | NamedDecl* D, SourceLocation PointOfInstantiation) { |
9066 | // Explicit instantiations following a specialization have no effect and |
9067 | // hence no PointOfInstantiation. In that case, walk decl backwards |
9068 | // until a valid name loc is found. |
9069 | SourceLocation PrevDiagLoc = PointOfInstantiation; |
9070 | for (Decl *Prev = D; Prev && !PrevDiagLoc.isValid(); |
9071 | Prev = Prev->getPreviousDecl()) { |
9072 | PrevDiagLoc = Prev->getLocation(); |
9073 | } |
9074 | assert(PrevDiagLoc.isValid() &&(static_cast <bool> (PrevDiagLoc.isValid() && "Explicit instantiation without point of instantiation?" ) ? void (0) : __assert_fail ("PrevDiagLoc.isValid() && \"Explicit instantiation without point of instantiation?\"" , "clang/lib/Sema/SemaTemplate.cpp", 9075, __extension__ __PRETTY_FUNCTION__ )) |
9075 | "Explicit instantiation without point of instantiation?")(static_cast <bool> (PrevDiagLoc.isValid() && "Explicit instantiation without point of instantiation?" ) ? void (0) : __assert_fail ("PrevDiagLoc.isValid() && \"Explicit instantiation without point of instantiation?\"" , "clang/lib/Sema/SemaTemplate.cpp", 9075, __extension__ __PRETTY_FUNCTION__ )); |
9076 | return PrevDiagLoc; |
9077 | } |
9078 | |
9079 | /// Diagnose cases where we have an explicit template specialization |
9080 | /// before/after an explicit template instantiation, producing diagnostics |
9081 | /// for those cases where they are required and determining whether the |
9082 | /// new specialization/instantiation will have any effect. |
9083 | /// |
9084 | /// \param NewLoc the location of the new explicit specialization or |
9085 | /// instantiation. |
9086 | /// |
9087 | /// \param NewTSK the kind of the new explicit specialization or instantiation. |
9088 | /// |
9089 | /// \param PrevDecl the previous declaration of the entity. |
9090 | /// |
9091 | /// \param PrevTSK the kind of the old explicit specialization or instantiatin. |
9092 | /// |
9093 | /// \param PrevPointOfInstantiation if valid, indicates where the previous |
9094 | /// declaration was instantiated (either implicitly or explicitly). |
9095 | /// |
9096 | /// \param HasNoEffect will be set to true to indicate that the new |
9097 | /// specialization or instantiation has no effect and should be ignored. |
9098 | /// |
9099 | /// \returns true if there was an error that should prevent the introduction of |
9100 | /// the new declaration into the AST, false otherwise. |
9101 | bool |
9102 | Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc, |
9103 | TemplateSpecializationKind NewTSK, |
9104 | NamedDecl *PrevDecl, |
9105 | TemplateSpecializationKind PrevTSK, |
9106 | SourceLocation PrevPointOfInstantiation, |
9107 | bool &HasNoEffect) { |
9108 | HasNoEffect = false; |
9109 | |
9110 | switch (NewTSK) { |
9111 | case TSK_Undeclared: |
9112 | case TSK_ImplicitInstantiation: |
9113 | assert((static_cast <bool> ((PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && "previous declaration must be implicit!" ) ? void (0) : __assert_fail ("(PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && \"previous declaration must be implicit!\"" , "clang/lib/Sema/SemaTemplate.cpp", 9115, __extension__ __PRETTY_FUNCTION__ )) |
9114 | (PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) &&(static_cast <bool> ((PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && "previous declaration must be implicit!" ) ? void (0) : __assert_fail ("(PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && \"previous declaration must be implicit!\"" , "clang/lib/Sema/SemaTemplate.cpp", 9115, __extension__ __PRETTY_FUNCTION__ )) |
9115 | "previous declaration must be implicit!")(static_cast <bool> ((PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && "previous declaration must be implicit!" ) ? void (0) : __assert_fail ("(PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && \"previous declaration must be implicit!\"" , "clang/lib/Sema/SemaTemplate.cpp", 9115, __extension__ __PRETTY_FUNCTION__ )); |
9116 | return false; |
9117 | |
9118 | case TSK_ExplicitSpecialization: |
9119 | switch (PrevTSK) { |
9120 | case TSK_Undeclared: |
9121 | case TSK_ExplicitSpecialization: |
9122 | // Okay, we're just specializing something that is either already |
9123 | // explicitly specialized or has merely been mentioned without any |
9124 | // instantiation. |
9125 | return false; |
9126 | |
9127 | case TSK_ImplicitInstantiation: |
9128 | if (PrevPointOfInstantiation.isInvalid()) { |
9129 | // The declaration itself has not actually been instantiated, so it is |
9130 | // still okay to specialize it. |
9131 | StripImplicitInstantiation( |
9132 | PrevDecl, |
9133 | Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()); |
9134 | return false; |
9135 | } |
9136 | // Fall through |
9137 | [[fallthrough]]; |
9138 | |
9139 | case TSK_ExplicitInstantiationDeclaration: |
9140 | case TSK_ExplicitInstantiationDefinition: |
9141 | assert((PrevTSK == TSK_ImplicitInstantiation ||(static_cast <bool> ((PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && "Explicit instantiation without point of instantiation?" ) ? void (0) : __assert_fail ("(PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && \"Explicit instantiation without point of instantiation?\"" , "clang/lib/Sema/SemaTemplate.cpp", 9143, __extension__ __PRETTY_FUNCTION__ )) |
9142 | PrevPointOfInstantiation.isValid()) &&(static_cast <bool> ((PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && "Explicit instantiation without point of instantiation?" ) ? void (0) : __assert_fail ("(PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && \"Explicit instantiation without point of instantiation?\"" , "clang/lib/Sema/SemaTemplate.cpp", 9143, __extension__ __PRETTY_FUNCTION__ )) |
9143 | "Explicit instantiation without point of instantiation?")(static_cast <bool> ((PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && "Explicit instantiation without point of instantiation?" ) ? void (0) : __assert_fail ("(PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && \"Explicit instantiation without point of instantiation?\"" , "clang/lib/Sema/SemaTemplate.cpp", 9143, __extension__ __PRETTY_FUNCTION__ )); |
9144 | |
9145 | // C++ [temp.expl.spec]p6: |
9146 | // If a template, a member template or the member of a class template |
9147 | // is explicitly specialized then that specialization shall be declared |
9148 | // before the first use of that specialization that would cause an |
9149 | // implicit instantiation to take place, in every translation unit in |
9150 | // which such a use occurs; no diagnostic is required. |
9151 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
9152 | // Is there any previous explicit specialization declaration? |
9153 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) |
9154 | return false; |
9155 | } |
9156 | |
9157 | Diag(NewLoc, diag::err_specialization_after_instantiation) |
9158 | << PrevDecl; |
9159 | Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here) |
9160 | << (PrevTSK != TSK_ImplicitInstantiation); |
9161 | |
9162 | return true; |
9163 | } |
9164 | llvm_unreachable("The switch over PrevTSK must be exhaustive.")::llvm::llvm_unreachable_internal("The switch over PrevTSK must be exhaustive." , "clang/lib/Sema/SemaTemplate.cpp", 9164); |
9165 | |
9166 | case TSK_ExplicitInstantiationDeclaration: |
9167 | switch (PrevTSK) { |
9168 | case TSK_ExplicitInstantiationDeclaration: |
9169 | // This explicit instantiation declaration is redundant (that's okay). |
9170 | HasNoEffect = true; |
9171 | return false; |
9172 | |
9173 | case TSK_Undeclared: |
9174 | case TSK_ImplicitInstantiation: |
9175 | // We're explicitly instantiating something that may have already been |
9176 | // implicitly instantiated; that's fine. |
9177 | return false; |
9178 | |
9179 | case TSK_ExplicitSpecialization: |
9180 | // C++0x [temp.explicit]p4: |
9181 | // For a given set of template parameters, if an explicit instantiation |
9182 | // of a template appears after a declaration of an explicit |
9183 | // specialization for that template, the explicit instantiation has no |
9184 | // effect. |
9185 | HasNoEffect = true; |
9186 | return false; |
9187 | |
9188 | case TSK_ExplicitInstantiationDefinition: |
9189 | // C++0x [temp.explicit]p10: |
9190 | // If an entity is the subject of both an explicit instantiation |
9191 | // declaration and an explicit instantiation definition in the same |
9192 | // translation unit, the definition shall follow the declaration. |
9193 | Diag(NewLoc, |
9194 | diag::err_explicit_instantiation_declaration_after_definition); |
9195 | |
9196 | // Explicit instantiations following a specialization have no effect and |
9197 | // hence no PrevPointOfInstantiation. In that case, walk decl backwards |
9198 | // until a valid name loc is found. |
9199 | Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation), |
9200 | diag::note_explicit_instantiation_definition_here); |
9201 | HasNoEffect = true; |
9202 | return false; |
9203 | } |
9204 | llvm_unreachable("Unexpected TemplateSpecializationKind!")::llvm::llvm_unreachable_internal("Unexpected TemplateSpecializationKind!" , "clang/lib/Sema/SemaTemplate.cpp", 9204); |
9205 | |
9206 | case TSK_ExplicitInstantiationDefinition: |
9207 | switch (PrevTSK) { |
9208 | case TSK_Undeclared: |
9209 | case TSK_ImplicitInstantiation: |
9210 | // We're explicitly instantiating something that may have already been |
9211 | // implicitly instantiated; that's fine. |
9212 | return false; |
9213 | |
9214 | case TSK_ExplicitSpecialization: |
9215 | // C++ DR 259, C++0x [temp.explicit]p4: |
9216 | // For a given set of template parameters, if an explicit |
9217 | // instantiation of a template appears after a declaration of |
9218 | // an explicit specialization for that template, the explicit |
9219 | // instantiation has no effect. |
9220 | Diag(NewLoc, diag::warn_explicit_instantiation_after_specialization) |
9221 | << PrevDecl; |
9222 | Diag(PrevDecl->getLocation(), |
9223 | diag::note_previous_template_specialization); |
9224 | HasNoEffect = true; |
9225 | return false; |
9226 | |
9227 | case TSK_ExplicitInstantiationDeclaration: |
9228 | // We're explicitly instantiating a definition for something for which we |
9229 | // were previously asked to suppress instantiations. That's fine. |
9230 | |
9231 | // C++0x [temp.explicit]p4: |
9232 | // For a given set of template parameters, if an explicit instantiation |
9233 | // of a template appears after a declaration of an explicit |
9234 | // specialization for that template, the explicit instantiation has no |
9235 | // effect. |
9236 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
9237 | // Is there any previous explicit specialization declaration? |
9238 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
9239 | HasNoEffect = true; |
9240 | break; |
9241 | } |
9242 | } |
9243 | |
9244 | return false; |
9245 | |
9246 | case TSK_ExplicitInstantiationDefinition: |
9247 | // C++0x [temp.spec]p5: |
9248 | // For a given template and a given set of template-arguments, |
9249 | // - an explicit instantiation definition shall appear at most once |
9250 | // in a program, |
9251 | |
9252 | // MSVCCompat: MSVC silently ignores duplicate explicit instantiations. |
9253 | Diag(NewLoc, (getLangOpts().MSVCCompat) |
9254 | ? diag::ext_explicit_instantiation_duplicate |
9255 | : diag::err_explicit_instantiation_duplicate) |
9256 | << PrevDecl; |
9257 | Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation), |
9258 | diag::note_previous_explicit_instantiation); |
9259 | HasNoEffect = true; |
9260 | return false; |
9261 | } |
9262 | } |
9263 | |
9264 | llvm_unreachable("Missing specialization/instantiation case?")::llvm::llvm_unreachable_internal("Missing specialization/instantiation case?" , "clang/lib/Sema/SemaTemplate.cpp", 9264); |
9265 | } |
9266 | |
9267 | /// Perform semantic analysis for the given dependent function |
9268 | /// template specialization. |
9269 | /// |
9270 | /// The only possible way to get a dependent function template specialization |
9271 | /// is with a friend declaration, like so: |
9272 | /// |
9273 | /// \code |
9274 | /// template \<class T> void foo(T); |
9275 | /// template \<class T> class A { |
9276 | /// friend void foo<>(T); |
9277 | /// }; |
9278 | /// \endcode |
9279 | /// |
9280 | /// There really isn't any useful analysis we can do here, so we |
9281 | /// just store the information. |
9282 | bool |
9283 | Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD, |
9284 | const TemplateArgumentListInfo &ExplicitTemplateArgs, |
9285 | LookupResult &Previous) { |
9286 | // Remove anything from Previous that isn't a function template in |
9287 | // the correct context. |
9288 | DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); |
9289 | LookupResult::Filter F = Previous.makeFilter(); |
9290 | enum DiscardReason { NotAFunctionTemplate, NotAMemberOfEnclosing }; |
9291 | SmallVector<std::pair<DiscardReason, Decl *>, 8> DiscardedCandidates; |
9292 | while (F.hasNext()) { |
9293 | NamedDecl *D = F.next()->getUnderlyingDecl(); |
9294 | if (!isa<FunctionTemplateDecl>(D)) { |
9295 | F.erase(); |
9296 | DiscardedCandidates.push_back(std::make_pair(NotAFunctionTemplate, D)); |
9297 | continue; |
9298 | } |
9299 | |
9300 | if (!FDLookupContext->InEnclosingNamespaceSetOf( |
9301 | D->getDeclContext()->getRedeclContext())) { |
9302 | F.erase(); |
9303 | DiscardedCandidates.push_back(std::make_pair(NotAMemberOfEnclosing, D)); |
9304 | continue; |
9305 | } |
9306 | } |
9307 | F.done(); |
9308 | |
9309 | if (Previous.empty()) { |
9310 | Diag(FD->getLocation(), |
9311 | diag::err_dependent_function_template_spec_no_match); |
9312 | for (auto &P : DiscardedCandidates) |
9313 | Diag(P.second->getLocation(), |
9314 | diag::note_dependent_function_template_spec_discard_reason) |
9315 | << P.first; |
9316 | return true; |
9317 | } |
9318 | |
9319 | FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(), |
9320 | ExplicitTemplateArgs); |
9321 | return false; |
9322 | } |
9323 | |
9324 | /// Perform semantic analysis for the given function template |
9325 | /// specialization. |
9326 | /// |
9327 | /// This routine performs all of the semantic analysis required for an |
9328 | /// explicit function template specialization. On successful completion, |
9329 | /// the function declaration \p FD will become a function template |
9330 | /// specialization. |
9331 | /// |
9332 | /// \param FD the function declaration, which will be updated to become a |
9333 | /// function template specialization. |
9334 | /// |
9335 | /// \param ExplicitTemplateArgs the explicitly-provided template arguments, |
9336 | /// if any. Note that this may be valid info even when 0 arguments are |
9337 | /// explicitly provided as in, e.g., \c void sort<>(char*, char*); |
9338 | /// as it anyway contains info on the angle brackets locations. |
9339 | /// |
9340 | /// \param Previous the set of declarations that may be specialized by |
9341 | /// this function specialization. |
9342 | /// |
9343 | /// \param QualifiedFriend whether this is a lookup for a qualified friend |
9344 | /// declaration with no explicit template argument list that might be |
9345 | /// befriending a function template specialization. |
9346 | bool Sema::CheckFunctionTemplateSpecialization( |
9347 | FunctionDecl *FD, TemplateArgumentListInfo *ExplicitTemplateArgs, |
9348 | LookupResult &Previous, bool QualifiedFriend) { |
9349 | // The set of function template specializations that could match this |
9350 | // explicit function template specialization. |
9351 | UnresolvedSet<8> Candidates; |
9352 | TemplateSpecCandidateSet FailedCandidates(FD->getLocation(), |
9353 | /*ForTakingAddress=*/false); |
9354 | |
9355 | llvm::SmallDenseMap<FunctionDecl *, TemplateArgumentListInfo, 8> |
9356 | ConvertedTemplateArgs; |
9357 | |
9358 | DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); |
9359 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
9360 | I != E; ++I) { |
9361 | NamedDecl *Ovl = (*I)->getUnderlyingDecl(); |
9362 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) { |
9363 | // Only consider templates found within the same semantic lookup scope as |
9364 | // FD. |
9365 | if (!FDLookupContext->InEnclosingNamespaceSetOf( |
9366 | Ovl->getDeclContext()->getRedeclContext())) |
9367 | continue; |
9368 | |
9369 | // When matching a constexpr member function template specialization |
9370 | // against the primary template, we don't yet know whether the |
9371 | // specialization has an implicit 'const' (because we don't know whether |
9372 | // it will be a static member function until we know which template it |
9373 | // specializes), so adjust it now assuming it specializes this template. |
9374 | QualType FT = FD->getType(); |
9375 | if (FD->isConstexpr()) { |
9376 | CXXMethodDecl *OldMD = |
9377 | dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); |
9378 | if (OldMD && OldMD->isConst()) { |
9379 | const FunctionProtoType *FPT = FT->castAs<FunctionProtoType>(); |
9380 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); |
9381 | EPI.TypeQuals.addConst(); |
9382 | FT = Context.getFunctionType(FPT->getReturnType(), |
9383 | FPT->getParamTypes(), EPI); |
9384 | } |
9385 | } |
9386 | |
9387 | TemplateArgumentListInfo Args; |
9388 | if (ExplicitTemplateArgs) |
9389 | Args = *ExplicitTemplateArgs; |
9390 | |
9391 | // C++ [temp.expl.spec]p11: |
9392 | // A trailing template-argument can be left unspecified in the |
9393 | // template-id naming an explicit function template specialization |
9394 | // provided it can be deduced from the function argument type. |
9395 | // Perform template argument deduction to determine whether we may be |
9396 | // specializing this template. |
9397 | // FIXME: It is somewhat wasteful to build |
9398 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); |
9399 | FunctionDecl *Specialization = nullptr; |
9400 | if (TemplateDeductionResult TDK = DeduceTemplateArguments( |
9401 | cast<FunctionTemplateDecl>(FunTmpl->getFirstDecl()), |
9402 | ExplicitTemplateArgs ? &Args : nullptr, FT, Specialization, |
9403 | Info)) { |
9404 | // Template argument deduction failed; record why it failed, so |
9405 | // that we can provide nifty diagnostics. |
9406 | FailedCandidates.addCandidate().set( |
9407 | I.getPair(), FunTmpl->getTemplatedDecl(), |
9408 | MakeDeductionFailureInfo(Context, TDK, Info)); |
9409 | (void)TDK; |
9410 | continue; |
9411 | } |
9412 | |
9413 | // Target attributes are part of the cuda function signature, so |
9414 | // the deduced template's cuda target must match that of the |
9415 | // specialization. Given that C++ template deduction does not |
9416 | // take target attributes into account, we reject candidates |
9417 | // here that have a different target. |
9418 | if (LangOpts.CUDA && |
9419 | IdentifyCUDATarget(Specialization, |
9420 | /* IgnoreImplicitHDAttr = */ true) != |
9421 | IdentifyCUDATarget(FD, /* IgnoreImplicitHDAttr = */ true)) { |
9422 | FailedCandidates.addCandidate().set( |
9423 | I.getPair(), FunTmpl->getTemplatedDecl(), |
9424 | MakeDeductionFailureInfo(Context, TDK_CUDATargetMismatch, Info)); |
9425 | continue; |
9426 | } |
9427 | |
9428 | // Record this candidate. |
9429 | if (ExplicitTemplateArgs) |
9430 | ConvertedTemplateArgs[Specialization] = std::move(Args); |
9431 | Candidates.addDecl(Specialization, I.getAccess()); |
9432 | } |
9433 | } |
9434 | |
9435 | // For a qualified friend declaration (with no explicit marker to indicate |
9436 | // that a template specialization was intended), note all (template and |
9437 | // non-template) candidates. |
9438 | if (QualifiedFriend && Candidates.empty()) { |
9439 | Diag(FD->getLocation(), diag::err_qualified_friend_no_match) |
9440 | << FD->getDeclName() << FDLookupContext; |
9441 | // FIXME: We should form a single candidate list and diagnose all |
9442 | // candidates at once, to get proper sorting and limiting. |
9443 | for (auto *OldND : Previous) { |
9444 | if (auto *OldFD = dyn_cast<FunctionDecl>(OldND->getUnderlyingDecl())) |
9445 | NoteOverloadCandidate(OldND, OldFD, CRK_None, FD->getType(), false); |
9446 | } |
9447 | FailedCandidates.NoteCandidates(*this, FD->getLocation()); |
9448 | return true; |
9449 | } |
9450 | |
9451 | // Find the most specialized function template. |
9452 | UnresolvedSetIterator Result = getMostSpecialized( |
9453 | Candidates.begin(), Candidates.end(), FailedCandidates, FD->getLocation(), |
9454 | PDiag(diag::err_function_template_spec_no_match) << FD->getDeclName(), |
9455 | PDiag(diag::err_function_template_spec_ambiguous) |
9456 | << FD->getDeclName() << (ExplicitTemplateArgs != nullptr), |
9457 | PDiag(diag::note_function_template_spec_matched)); |
9458 | |
9459 | if (Result == Candidates.end()) |
9460 | return true; |
9461 | |
9462 | // Ignore access information; it doesn't figure into redeclaration checking. |
9463 | FunctionDecl *Specialization = cast<FunctionDecl>(*Result); |
9464 | |
9465 | FunctionTemplateSpecializationInfo *SpecInfo |
9466 | = Specialization->getTemplateSpecializationInfo(); |
9467 | assert(SpecInfo && "Function template specialization info missing?")(static_cast <bool> (SpecInfo && "Function template specialization info missing?" ) ? void (0) : __assert_fail ("SpecInfo && \"Function template specialization info missing?\"" , "clang/lib/Sema/SemaTemplate.cpp", 9467, __extension__ __PRETTY_FUNCTION__ )); |
9468 | |
9469 | // Note: do not overwrite location info if previous template |
9470 | // specialization kind was explicit. |
9471 | TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind(); |
9472 | if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation) { |
9473 | Specialization->setLocation(FD->getLocation()); |
9474 | Specialization->setLexicalDeclContext(FD->getLexicalDeclContext()); |
9475 | // C++11 [dcl.constexpr]p1: An explicit specialization of a constexpr |
9476 | // function can differ from the template declaration with respect to |
9477 | // the constexpr specifier. |
9478 | // FIXME: We need an update record for this AST mutation. |
9479 | // FIXME: What if there are multiple such prior declarations (for instance, |
9480 | // from different modules)? |
9481 | Specialization->setConstexprKind(FD->getConstexprKind()); |
9482 | } |
9483 | |
9484 | // FIXME: Check if the prior specialization has a point of instantiation. |
9485 | // If so, we have run afoul of . |
9486 | |
9487 | // If this is a friend declaration, then we're not really declaring |
9488 | // an explicit specialization. |
9489 | bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None); |
9490 | |
9491 | // Check the scope of this explicit specialization. |
9492 | if (!isFriend && |
9493 | CheckTemplateSpecializationScope(*this, |
9494 | Specialization->getPrimaryTemplate(), |
9495 | Specialization, FD->getLocation(), |
9496 | false)) |
9497 | return true; |
9498 | |
9499 | // C++ [temp.expl.spec]p6: |
9500 | // If a template, a member template or the member of a class template is |
9501 | // explicitly specialized then that specialization shall be declared |
9502 | // before the first use of that specialization that would cause an implicit |
9503 | // instantiation to take place, in every translation unit in which such a |
9504 | // use occurs; no diagnostic is required. |
9505 | bool HasNoEffect = false; |
9506 | if (!isFriend && |
9507 | CheckSpecializationInstantiationRedecl(FD->getLocation(), |
9508 | TSK_ExplicitSpecialization, |
9509 | Specialization, |
9510 | SpecInfo->getTemplateSpecializationKind(), |
9511 | SpecInfo->getPointOfInstantiation(), |
9512 | HasNoEffect)) |
9513 | return true; |
9514 | |
9515 | // Mark the prior declaration as an explicit specialization, so that later |
9516 | // clients know that this is an explicit specialization. |
9517 | if (!isFriend) { |
9518 | // Since explicit specializations do not inherit '=delete' from their |
9519 | // primary function template - check if the 'specialization' that was |
9520 | // implicitly generated (during template argument deduction for partial |
9521 | // ordering) from the most specialized of all the function templates that |
9522 | // 'FD' could have been specializing, has a 'deleted' definition. If so, |
9523 | // first check that it was implicitly generated during template argument |
9524 | // deduction by making sure it wasn't referenced, and then reset the deleted |
9525 | // flag to not-deleted, so that we can inherit that information from 'FD'. |
9526 | if (Specialization->isDeleted() && !SpecInfo->isExplicitSpecialization() && |
9527 | !Specialization->getCanonicalDecl()->isReferenced()) { |
9528 | // FIXME: This assert will not hold in the presence of modules. |
9529 | assert((static_cast <bool> (Specialization->getCanonicalDecl () == Specialization && "This must be the only existing declaration of this specialization" ) ? void (0) : __assert_fail ("Specialization->getCanonicalDecl() == Specialization && \"This must be the only existing declaration of this specialization\"" , "clang/lib/Sema/SemaTemplate.cpp", 9531, __extension__ __PRETTY_FUNCTION__ )) |
9530 | Specialization->getCanonicalDecl() == Specialization &&(static_cast <bool> (Specialization->getCanonicalDecl () == Specialization && "This must be the only existing declaration of this specialization" ) ? void (0) : __assert_fail ("Specialization->getCanonicalDecl() == Specialization && \"This must be the only existing declaration of this specialization\"" , "clang/lib/Sema/SemaTemplate.cpp", 9531, __extension__ __PRETTY_FUNCTION__ )) |
9531 | "This must be the only existing declaration of this specialization")(static_cast <bool> (Specialization->getCanonicalDecl () == Specialization && "This must be the only existing declaration of this specialization" ) ? void (0) : __assert_fail ("Specialization->getCanonicalDecl() == Specialization && \"This must be the only existing declaration of this specialization\"" , "clang/lib/Sema/SemaTemplate.cpp", 9531, __extension__ __PRETTY_FUNCTION__ )); |
9532 | // FIXME: We need an update record for this AST mutation. |
9533 | Specialization->setDeletedAsWritten(false); |
9534 | } |
9535 | // FIXME: We need an update record for this AST mutation. |
9536 | SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization); |
9537 | MarkUnusedFileScopedDecl(Specialization); |
9538 | } |
9539 | |
9540 | // Turn the given function declaration into a function template |
9541 | // specialization, with the template arguments from the previous |
9542 | // specialization. |
9543 | // Take copies of (semantic and syntactic) template argument lists. |
9544 | const TemplateArgumentList* TemplArgs = new (Context) |
9545 | TemplateArgumentList(Specialization->getTemplateSpecializationArgs()); |
9546 | FD->setFunctionTemplateSpecialization( |
9547 | Specialization->getPrimaryTemplate(), TemplArgs, /*InsertPos=*/nullptr, |
9548 | SpecInfo->getTemplateSpecializationKind(), |
9549 | ExplicitTemplateArgs ? &ConvertedTemplateArgs[Specialization] : nullptr); |
9550 | |
9551 | // A function template specialization inherits the target attributes |
9552 | // of its template. (We require the attributes explicitly in the |
9553 | // code to match, but a template may have implicit attributes by |
9554 | // virtue e.g. of being constexpr, and it passes these implicit |
9555 | // attributes on to its specializations.) |
9556 | if (LangOpts.CUDA) |
9557 | inheritCUDATargetAttrs(FD, *Specialization->getPrimaryTemplate()); |
9558 | |
9559 | // The "previous declaration" for this function template specialization is |
9560 | // the prior function template specialization. |
9561 | Previous.clear(); |
9562 | Previous.addDecl(Specialization); |
9563 | return false; |
9564 | } |
9565 | |
9566 | /// Perform semantic analysis for the given non-template member |
9567 | /// specialization. |
9568 | /// |
9569 | /// This routine performs all of the semantic analysis required for an |
9570 | /// explicit member function specialization. On successful completion, |
9571 | /// the function declaration \p FD will become a member function |
9572 | /// specialization. |
9573 | /// |
9574 | /// \param Member the member declaration, which will be updated to become a |
9575 | /// specialization. |
9576 | /// |
9577 | /// \param Previous the set of declarations, one of which may be specialized |
9578 | /// by this function specialization; the set will be modified to contain the |
9579 | /// redeclared member. |
9580 | bool |
9581 | Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) { |
9582 | assert(!isa<TemplateDecl>(Member) && "Only for non-template members")(static_cast <bool> (!isa<TemplateDecl>(Member) && "Only for non-template members") ? void (0) : __assert_fail ( "!isa<TemplateDecl>(Member) && \"Only for non-template members\"" , "clang/lib/Sema/SemaTemplate.cpp", 9582, __extension__ __PRETTY_FUNCTION__ )); |
9583 | |
9584 | // Try to find the member we are instantiating. |
9585 | NamedDecl *FoundInstantiation = nullptr; |
9586 | NamedDecl *Instantiation = nullptr; |
9587 | NamedDecl *InstantiatedFrom = nullptr; |
9588 | MemberSpecializationInfo *MSInfo = nullptr; |
9589 | |
9590 | if (Previous.empty()) { |
9591 | // Nowhere to look anyway. |
9592 | } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) { |
9593 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); |
9594 | I != E; ++I) { |
9595 | NamedDecl *D = (*I)->getUnderlyingDecl(); |
9596 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { |
9597 | QualType Adjusted = Function->getType(); |
9598 | if (!hasExplicitCallingConv(Adjusted)) |
9599 | Adjusted = adjustCCAndNoReturn(Adjusted, Method->getType()); |
9600 | // This doesn't handle deduced return types, but both function |
9601 | // declarations should be undeduced at this point. |
9602 | if (Context.hasSameType(Adjusted, Method->getType())) { |
9603 | FoundInstantiation = *I; |
9604 | Instantiation = Method; |
9605 | InstantiatedFrom = Method->getInstantiatedFromMemberFunction(); |
9606 | MSInfo = Method->getMemberSpecializationInfo(); |
9607 | break; |
9608 | } |
9609 | } |
9610 | } |
9611 | } else if (isa<VarDecl>(Member)) { |
9612 | VarDecl *PrevVar; |
9613 | if (Previous.isSingleResult() && |
9614 | (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl()))) |
9615 | if (PrevVar->isStaticDataMember()) { |
9616 | FoundInstantiation = Previous.getRepresentativeDecl(); |
9617 | Instantiation = PrevVar; |
9618 | InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember(); |
9619 | MSInfo = PrevVar->getMemberSpecializationInfo(); |
9620 | } |
9621 | } else if (isa<RecordDecl>(Member)) { |
9622 | CXXRecordDecl *PrevRecord; |
9623 | if (Previous.isSingleResult() && |
9624 | (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) { |
9625 | FoundInstantiation = Previous.getRepresentativeDecl(); |
9626 | Instantiation = PrevRecord; |
9627 | InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass(); |
9628 | MSInfo = PrevRecord->getMemberSpecializationInfo(); |
9629 | } |
9630 | } else if (isa<EnumDecl>(Member)) { |
9631 | EnumDecl *PrevEnum; |
9632 | if (Previous.isSingleResult() && |
9633 | (PrevEnum = dyn_cast<EnumDecl>(Previous.getFoundDecl()))) { |
9634 | FoundInstantiation = Previous.getRepresentativeDecl(); |
9635 | Instantiation = PrevEnum; |
9636 | InstantiatedFrom = PrevEnum->getInstantiatedFromMemberEnum(); |
9637 | MSInfo = PrevEnum->getMemberSpecializationInfo(); |
9638 | } |
9639 | } |
9640 | |
9641 | if (!Instantiation) { |
9642 | // There is no previous declaration that matches. Since member |
9643 | // specializations are always out-of-line, the caller will complain about |
9644 | // this mismatch later. |
9645 | return false; |
9646 | } |
9647 | |
9648 | // A member specialization in a friend declaration isn't really declaring |
9649 | // an explicit specialization, just identifying a specific (possibly implicit) |
9650 | // specialization. Don't change the template specialization kind. |
9651 | // |
9652 | // FIXME: Is this really valid? Other compilers reject. |
9653 | if (Member->getFriendObjectKind() != Decl::FOK_None) { |
9654 | // Preserve instantiation information. |
9655 | if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) { |
9656 | cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction( |
9657 | cast<CXXMethodDecl>(InstantiatedFrom), |
9658 | cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind()); |
9659 | } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) { |
9660 | cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass( |
9661 | cast<CXXRecordDecl>(InstantiatedFrom), |
9662 | cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind()); |
9663 | } |
9664 | |
9665 | Previous.clear(); |
9666 | Previous.addDecl(FoundInstantiation); |
9667 | return false; |
9668 | } |
9669 | |
9670 | // Make sure that this is a specialization of a member. |
9671 | if (!InstantiatedFrom) { |
9672 | Diag(Member->getLocation(), diag::err_spec_member_not_instantiated) |
9673 | << Member; |
9674 | Diag(Instantiation->getLocation(), diag::note_specialized_decl); |
9675 | return true; |
9676 | } |
9677 | |
9678 | // C++ [temp.expl.spec]p6: |
9679 | // If a template, a member template or the member of a class template is |
9680 | // explicitly specialized then that specialization shall be declared |
9681 | // before the first use of that specialization that would cause an implicit |
9682 | // instantiation to take place, in every translation unit in which such a |
9683 | // use occurs; no diagnostic is required. |
9684 | assert(MSInfo && "Member specialization info missing?")(static_cast <bool> (MSInfo && "Member specialization info missing?" ) ? void (0) : __assert_fail ("MSInfo && \"Member specialization info missing?\"" , "clang/lib/Sema/SemaTemplate.cpp", 9684, __extension__ __PRETTY_FUNCTION__ )); |
9685 | |
9686 | bool HasNoEffect = false; |
9687 | if (CheckSpecializationInstantiationRedecl(Member->getLocation(), |
9688 | TSK_ExplicitSpecialization, |
9689 | Instantiation, |
9690 | MSInfo->getTemplateSpecializationKind(), |
9691 | MSInfo->getPointOfInstantiation(), |
9692 | HasNoEffect)) |
9693 | return true; |
9694 | |
9695 | // Check the scope of this explicit specialization. |
9696 | if (CheckTemplateSpecializationScope(*this, |
9697 | InstantiatedFrom, |
9698 | Instantiation, Member->getLocation(), |
9699 | false)) |
9700 | return true; |
9701 | |
9702 | // Note that this member specialization is an "instantiation of" the |
9703 | // corresponding member of the original template. |
9704 | if (auto *MemberFunction = dyn_cast<FunctionDecl>(Member)) { |
9705 | FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation); |
9706 | if (InstantiationFunction->getTemplateSpecializationKind() == |
9707 | TSK_ImplicitInstantiation) { |
9708 | // Explicit specializations of member functions of class templates do not |
9709 | // inherit '=delete' from the member function they are specializing. |
9710 | if (InstantiationFunction->isDeleted()) { |
9711 | // FIXME: This assert will not hold in the presence of modules. |
9712 | assert(InstantiationFunction->getCanonicalDecl() ==(static_cast <bool> (InstantiationFunction->getCanonicalDecl () == InstantiationFunction) ? void (0) : __assert_fail ("InstantiationFunction->getCanonicalDecl() == InstantiationFunction" , "clang/lib/Sema/SemaTemplate.cpp", 9713, __extension__ __PRETTY_FUNCTION__ )) |
9713 | InstantiationFunction)(static_cast <bool> (InstantiationFunction->getCanonicalDecl () == InstantiationFunction) ? void (0) : __assert_fail ("InstantiationFunction->getCanonicalDecl() == InstantiationFunction" , "clang/lib/Sema/SemaTemplate.cpp", 9713, __extension__ __PRETTY_FUNCTION__ )); |
9714 | // FIXME: We need an update record for this AST mutation. |
9715 | InstantiationFunction->setDeletedAsWritten(false); |
9716 | } |
9717 | } |
9718 | |
9719 | MemberFunction->setInstantiationOfMemberFunction( |
9720 | cast<CXXMethodDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9721 | } else if (auto *MemberVar = dyn_cast<VarDecl>(Member)) { |
9722 | MemberVar->setInstantiationOfStaticDataMember( |
9723 | cast<VarDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9724 | } else if (auto *MemberClass = dyn_cast<CXXRecordDecl>(Member)) { |
9725 | MemberClass->setInstantiationOfMemberClass( |
9726 | cast<CXXRecordDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9727 | } else if (auto *MemberEnum = dyn_cast<EnumDecl>(Member)) { |
9728 | MemberEnum->setInstantiationOfMemberEnum( |
9729 | cast<EnumDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); |
9730 | } else { |
9731 | llvm_unreachable("unknown member specialization kind")::llvm::llvm_unreachable_internal("unknown member specialization kind" , "clang/lib/Sema/SemaTemplate.cpp", 9731); |
9732 | } |
9733 | |
9734 | // Save the caller the trouble of having to figure out which declaration |
9735 | // this specialization matches. |
9736 | Previous.clear(); |
9737 | Previous.addDecl(FoundInstantiation); |
9738 | return false; |
9739 | } |
9740 | |
9741 | /// Complete the explicit specialization of a member of a class template by |
9742 | /// updating the instantiated member to be marked as an explicit specialization. |
9743 | /// |
9744 | /// \param OrigD The member declaration instantiated from the template. |
9745 | /// \param Loc The location of the explicit specialization of the member. |
9746 | template<typename DeclT> |
9747 | static void completeMemberSpecializationImpl(Sema &S, DeclT *OrigD, |
9748 | SourceLocation Loc) { |
9749 | if (OrigD->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) |
9750 | return; |
9751 | |
9752 | // FIXME: Inform AST mutation listeners of this AST mutation. |
9753 | // FIXME: If there are multiple in-class declarations of the member (from |
9754 | // multiple modules, or a declaration and later definition of a member type), |
9755 | // should we update all of them? |
9756 | OrigD->setTemplateSpecializationKind(TSK_ExplicitSpecialization); |
9757 | OrigD->setLocation(Loc); |
9758 | } |
9759 | |
9760 | void Sema::CompleteMemberSpecialization(NamedDecl *Member, |
9761 | LookupResult &Previous) { |
9762 | NamedDecl *Instantiation = cast<NamedDecl>(Member->getCanonicalDecl()); |
9763 | if (Instantiation == Member) |
9764 | return; |
9765 | |
9766 | if (auto *Function = dyn_cast<CXXMethodDecl>(Instantiation)) |
9767 | completeMemberSpecializationImpl(*this, Function, Member->getLocation()); |
9768 | else if (auto *Var = dyn_cast<VarDecl>(Instantiation)) |
9769 | completeMemberSpecializationImpl(*this, Var, Member->getLocation()); |
9770 | else if (auto *Record = dyn_cast<CXXRecordDecl>(Instantiation)) |
9771 | completeMemberSpecializationImpl(*this, Record, Member->getLocation()); |
9772 | else if (auto *Enum = dyn_cast<EnumDecl>(Instantiation)) |
9773 | completeMemberSpecializationImpl(*this, Enum, Member->getLocation()); |
9774 | else |
9775 | llvm_unreachable("unknown member specialization kind")::llvm::llvm_unreachable_internal("unknown member specialization kind" , "clang/lib/Sema/SemaTemplate.cpp", 9775); |
9776 | } |
9777 | |
9778 | /// Check the scope of an explicit instantiation. |
9779 | /// |
9780 | /// \returns true if a serious error occurs, false otherwise. |
9781 | static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D, |
9782 | SourceLocation InstLoc, |
9783 | bool WasQualifiedName) { |
9784 | DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext(); |
9785 | DeclContext *CurContext = S.CurContext->getRedeclContext(); |
9786 | |
9787 | if (CurContext->isRecord()) { |
9788 | S.Diag(InstLoc, diag::err_explicit_instantiation_in_class) |
9789 | << D; |
9790 | return true; |
9791 | } |
9792 | |
9793 | // C++11 [temp.explicit]p3: |
9794 | // An explicit instantiation shall appear in an enclosing namespace of its |
9795 | // template. If the name declared in the explicit instantiation is an |
9796 | // unqualified name, the explicit instantiation shall appear in the |
9797 | // namespace where its template is declared or, if that namespace is inline |
9798 | // (7.3.1), any namespace from its enclosing namespace set. |
9799 | // |
9800 | // This is DR275, which we do not retroactively apply to C++98/03. |
9801 | if (WasQualifiedName) { |
9802 | if (CurContext->Encloses(OrigContext)) |
9803 | return false; |
9804 | } else { |
9805 | if (CurContext->InEnclosingNamespaceSetOf(OrigContext)) |
9806 | return false; |
9807 | } |
9808 | |
9809 | if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext)) { |
9810 | if (WasQualifiedName) |
9811 | S.Diag(InstLoc, |
9812 | S.getLangOpts().CPlusPlus11? |
9813 | diag::err_explicit_instantiation_out_of_scope : |
9814 | diag::warn_explicit_instantiation_out_of_scope_0x) |
9815 | << D << NS; |
9816 | else |
9817 | S.Diag(InstLoc, |
9818 | S.getLangOpts().CPlusPlus11? |
9819 | diag::err_explicit_instantiation_unqualified_wrong_namespace : |
9820 | diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x) |
9821 | << D << NS; |
9822 | } else |
9823 | S.Diag(InstLoc, |
9824 | S.getLangOpts().CPlusPlus11? |
9825 | diag::err_explicit_instantiation_must_be_global : |
9826 | diag::warn_explicit_instantiation_must_be_global_0x) |
9827 | << D; |
9828 | S.Diag(D->getLocation(), diag::note_explicit_instantiation_here); |
9829 | return false; |
9830 | } |
9831 | |
9832 | /// Common checks for whether an explicit instantiation of \p D is valid. |
9833 | static bool CheckExplicitInstantiation(Sema &S, NamedDecl *D, |
9834 | SourceLocation InstLoc, |
9835 | bool WasQualifiedName, |
9836 | TemplateSpecializationKind TSK) { |
9837 | // C++ [temp.explicit]p13: |
9838 | // An explicit instantiation declaration shall not name a specialization of |
9839 | // a template with internal linkage. |
9840 | if (TSK == TSK_ExplicitInstantiationDeclaration && |
9841 | D->getFormalLinkage() == InternalLinkage) { |
9842 | S.Diag(InstLoc, diag::err_explicit_instantiation_internal_linkage) << D; |
9843 | return true; |
9844 | } |
9845 | |
9846 | // C++11 [temp.explicit]p3: [DR 275] |
9847 | // An explicit instantiation shall appear in an enclosing namespace of its |
9848 | // template. |
9849 | if (CheckExplicitInstantiationScope(S, D, InstLoc, WasQualifiedName)) |
9850 | return true; |
9851 | |
9852 | return false; |
9853 | } |
9854 | |
9855 | /// Determine whether the given scope specifier has a template-id in it. |
9856 | static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) { |
9857 | if (!SS.isSet()) |
9858 | return false; |
9859 | |
9860 | // C++11 [temp.explicit]p3: |
9861 | // If the explicit instantiation is for a member function, a member class |
9862 | // or a static data member of a class template specialization, the name of |
9863 | // the class template specialization in the qualified-id for the member |
9864 | // name shall be a simple-template-id. |
9865 | // |
9866 | // C++98 has the same restriction, just worded differently. |
9867 | for (NestedNameSpecifier *NNS = SS.getScopeRep(); NNS; |
9868 | NNS = NNS->getPrefix()) |
9869 | if (const Type *T = NNS->getAsType()) |
9870 | if (isa<TemplateSpecializationType>(T)) |
9871 | return true; |
9872 | |
9873 | return false; |
9874 | } |
9875 | |
9876 | /// Make a dllexport or dllimport attr on a class template specialization take |
9877 | /// effect. |
9878 | static void dllExportImportClassTemplateSpecialization( |
9879 | Sema &S, ClassTemplateSpecializationDecl *Def) { |
9880 | auto *A = cast_or_null<InheritableAttr>(getDLLAttr(Def)); |
9881 | assert(A && "dllExportImportClassTemplateSpecialization called "(static_cast <bool> (A && "dllExportImportClassTemplateSpecialization called " "on Def without dllexport or dllimport") ? void (0) : __assert_fail ("A && \"dllExportImportClassTemplateSpecialization called \" \"on Def without dllexport or dllimport\"" , "clang/lib/Sema/SemaTemplate.cpp", 9882, __extension__ __PRETTY_FUNCTION__ )) |
9882 | "on Def without dllexport or dllimport")(static_cast <bool> (A && "dllExportImportClassTemplateSpecialization called " "on Def without dllexport or dllimport") ? void (0) : __assert_fail ("A && \"dllExportImportClassTemplateSpecialization called \" \"on Def without dllexport or dllimport\"" , "clang/lib/Sema/SemaTemplate.cpp", 9882, __extension__ __PRETTY_FUNCTION__ )); |
9883 | |
9884 | // We reject explicit instantiations in class scope, so there should |
9885 | // never be any delayed exported classes to worry about. |
9886 | assert(S.DelayedDllExportClasses.empty() &&(static_cast <bool> (S.DelayedDllExportClasses.empty() && "delayed exports present at explicit instantiation") ? void ( 0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"delayed exports present at explicit instantiation\"" , "clang/lib/Sema/SemaTemplate.cpp", 9887, __extension__ __PRETTY_FUNCTION__ )) |
9887 | "delayed exports present at explicit instantiation")(static_cast <bool> (S.DelayedDllExportClasses.empty() && "delayed exports present at explicit instantiation") ? void ( 0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"delayed exports present at explicit instantiation\"" , "clang/lib/Sema/SemaTemplate.cpp", 9887, __extension__ __PRETTY_FUNCTION__ )); |
9888 | S.checkClassLevelDLLAttribute(Def); |
9889 | |
9890 | // Propagate attribute to base class templates. |
9891 | for (auto &B : Def->bases()) { |
9892 | if (auto *BT = dyn_cast_or_null<ClassTemplateSpecializationDecl>( |
9893 | B.getType()->getAsCXXRecordDecl())) |
9894 | S.propagateDLLAttrToBaseClassTemplate(Def, A, BT, B.getBeginLoc()); |
9895 | } |
9896 | |
9897 | S.referenceDLLExportedClassMethods(); |
9898 | } |
9899 | |
9900 | // Explicit instantiation of a class template specialization |
9901 | DeclResult Sema::ActOnExplicitInstantiation( |
9902 | Scope *S, SourceLocation ExternLoc, SourceLocation TemplateLoc, |
9903 | unsigned TagSpec, SourceLocation KWLoc, const CXXScopeSpec &SS, |
9904 | TemplateTy TemplateD, SourceLocation TemplateNameLoc, |
9905 | SourceLocation LAngleLoc, ASTTemplateArgsPtr TemplateArgsIn, |
9906 | SourceLocation RAngleLoc, const ParsedAttributesView &Attr) { |
9907 | // Find the class template we're specializing |
9908 | TemplateName Name = TemplateD.get(); |
9909 | TemplateDecl *TD = Name.getAsTemplateDecl(); |
9910 | // Check that the specialization uses the same tag kind as the |
9911 | // original template. |
9912 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
9913 | assert(Kind != TTK_Enum &&(static_cast <bool> (Kind != TTK_Enum && "Invalid enum tag in class template explicit instantiation!" ) ? void (0) : __assert_fail ("Kind != TTK_Enum && \"Invalid enum tag in class template explicit instantiation!\"" , "clang/lib/Sema/SemaTemplate.cpp", 9914, __extension__ __PRETTY_FUNCTION__ )) |
9914 | "Invalid enum tag in class template explicit instantiation!")(static_cast <bool> (Kind != TTK_Enum && "Invalid enum tag in class template explicit instantiation!" ) ? void (0) : __assert_fail ("Kind != TTK_Enum && \"Invalid enum tag in class template explicit instantiation!\"" , "clang/lib/Sema/SemaTemplate.cpp", 9914, __extension__ __PRETTY_FUNCTION__ )); |
9915 | |
9916 | ClassTemplateDecl *ClassTemplate = dyn_cast<ClassTemplateDecl>(TD); |
9917 | |
9918 | if (!ClassTemplate) { |
9919 | NonTagKind NTK = getNonTagTypeDeclKind(TD, Kind); |
9920 | Diag(TemplateNameLoc, diag::err_tag_reference_non_tag) << TD << NTK << Kind; |
9921 | Diag(TD->getLocation(), diag::note_previous_use); |
9922 | return true; |
9923 | } |
9924 | |
9925 | if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), |
9926 | Kind, /*isDefinition*/false, KWLoc, |
9927 | ClassTemplate->getIdentifier())) { |
9928 | Diag(KWLoc, diag::err_use_with_wrong_tag) |
9929 | << ClassTemplate |
9930 | << FixItHint::CreateReplacement(KWLoc, |
9931 | ClassTemplate->getTemplatedDecl()->getKindName()); |
9932 | Diag(ClassTemplate->getTemplatedDecl()->getLocation(), |
9933 | diag::note_previous_use); |
9934 | Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); |
9935 | } |
9936 | |
9937 | // C++0x [temp.explicit]p2: |
9938 | // There are two forms of explicit instantiation: an explicit instantiation |
9939 | // definition and an explicit instantiation declaration. An explicit |
9940 | // instantiation declaration begins with the extern keyword. [...] |
9941 | TemplateSpecializationKind TSK = ExternLoc.isInvalid() |
9942 | ? TSK_ExplicitInstantiationDefinition |
9943 | : TSK_ExplicitInstantiationDeclaration; |
9944 | |
9945 | if (TSK == TSK_ExplicitInstantiationDeclaration && |
9946 | !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { |
9947 | // Check for dllexport class template instantiation declarations, |
9948 | // except for MinGW mode. |
9949 | for (const ParsedAttr &AL : Attr) { |
9950 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { |
9951 | Diag(ExternLoc, |
9952 | diag::warn_attribute_dllexport_explicit_instantiation_decl); |
9953 | Diag(AL.getLoc(), diag::note_attribute); |
9954 | break; |
9955 | } |
9956 | } |
9957 | |
9958 | if (auto *A = ClassTemplate->getTemplatedDecl()->getAttr<DLLExportAttr>()) { |
9959 | Diag(ExternLoc, |
9960 | diag::warn_attribute_dllexport_explicit_instantiation_decl); |
9961 | Diag(A->getLocation(), diag::note_attribute); |
9962 | } |
9963 | } |
9964 | |
9965 | // In MSVC mode, dllimported explicit instantiation definitions are treated as |
9966 | // instantiation declarations for most purposes. |
9967 | bool DLLImportExplicitInstantiationDef = false; |
9968 | if (TSK == TSK_ExplicitInstantiationDefinition && |
9969 | Context.getTargetInfo().getCXXABI().isMicrosoft()) { |
9970 | // Check for dllimport class template instantiation definitions. |
9971 | bool DLLImport = |
9972 | ClassTemplate->getTemplatedDecl()->getAttr<DLLImportAttr>(); |
9973 | for (const ParsedAttr &AL : Attr) { |
9974 | if (AL.getKind() == ParsedAttr::AT_DLLImport) |
9975 | DLLImport = true; |
9976 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { |
9977 | // dllexport trumps dllimport here. |
9978 | DLLImport = false; |
9979 | break; |
9980 | } |
9981 | } |
9982 | if (DLLImport) { |
9983 | TSK = TSK_ExplicitInstantiationDeclaration; |
9984 | DLLImportExplicitInstantiationDef = true; |
9985 | } |
9986 | } |
9987 | |
9988 | // Translate the parser's template argument list in our AST format. |
9989 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
9990 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
9991 | |
9992 | // Check that the template argument list is well-formed for this |
9993 | // template. |
9994 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
9995 | if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, TemplateArgs, |
9996 | false, SugaredConverted, CanonicalConverted, |
9997 | /*UpdateArgsWithConversions=*/true)) |
9998 | return true; |
9999 | |
10000 | // Find the class template specialization declaration that |
10001 | // corresponds to these arguments. |
10002 | void *InsertPos = nullptr; |
10003 | ClassTemplateSpecializationDecl *PrevDecl = |
10004 | ClassTemplate->findSpecialization(CanonicalConverted, InsertPos); |
10005 | |
10006 | TemplateSpecializationKind PrevDecl_TSK |
10007 | = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared; |
10008 | |
10009 | if (TSK == TSK_ExplicitInstantiationDefinition && PrevDecl != nullptr && |
10010 | Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { |
10011 | // Check for dllexport class template instantiation definitions in MinGW |
10012 | // mode, if a previous declaration of the instantiation was seen. |
10013 | for (const ParsedAttr &AL : Attr) { |
10014 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { |
10015 | Diag(AL.getLoc(), |
10016 | diag::warn_attribute_dllexport_explicit_instantiation_def); |
10017 | break; |
10018 | } |
10019 | } |
10020 | } |
10021 | |
10022 | if (CheckExplicitInstantiation(*this, ClassTemplate, TemplateNameLoc, |
10023 | SS.isSet(), TSK)) |
10024 | return true; |
10025 | |
10026 | ClassTemplateSpecializationDecl *Specialization = nullptr; |
10027 | |
10028 | bool HasNoEffect = false; |
10029 | if (PrevDecl) { |
10030 | if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK, |
10031 | PrevDecl, PrevDecl_TSK, |
10032 | PrevDecl->getPointOfInstantiation(), |
10033 | HasNoEffect)) |
10034 | return PrevDecl; |
10035 | |
10036 | // Even though HasNoEffect == true means that this explicit instantiation |
10037 | // has no effect on semantics, we go on to put its syntax in the AST. |
10038 | |
10039 | if (PrevDecl_TSK == TSK_ImplicitInstantiation || |
10040 | PrevDecl_TSK == TSK_Undeclared) { |
10041 | // Since the only prior class template specialization with these |
10042 | // arguments was referenced but not declared, reuse that |
10043 | // declaration node as our own, updating the source location |
10044 | // for the template name to reflect our new declaration. |
10045 | // (Other source locations will be updated later.) |
10046 | Specialization = PrevDecl; |
10047 | Specialization->setLocation(TemplateNameLoc); |
10048 | PrevDecl = nullptr; |
10049 | } |
10050 | |
10051 | if (PrevDecl_TSK == TSK_ExplicitInstantiationDeclaration && |
10052 | DLLImportExplicitInstantiationDef) { |
10053 | // The new specialization might add a dllimport attribute. |
10054 | HasNoEffect = false; |
10055 | } |
10056 | } |
10057 | |
10058 | if (!Specialization) { |
10059 | // Create a new class template specialization declaration node for |
10060 | // this explicit specialization. |
10061 | Specialization = ClassTemplateSpecializationDecl::Create( |
10062 | Context, Kind, ClassTemplate->getDeclContext(), KWLoc, TemplateNameLoc, |
10063 | ClassTemplate, CanonicalConverted, PrevDecl); |
10064 | SetNestedNameSpecifier(*this, Specialization, SS); |
10065 | |
10066 | if (!HasNoEffect && !PrevDecl) { |
10067 | // Insert the new specialization. |
10068 | ClassTemplate->AddSpecialization(Specialization, InsertPos); |
10069 | } |
10070 | } |
10071 | |
10072 | // Build the fully-sugared type for this explicit instantiation as |
10073 | // the user wrote in the explicit instantiation itself. This means |
10074 | // that we'll pretty-print the type retrieved from the |
10075 | // specialization's declaration the way that the user actually wrote |
10076 | // the explicit instantiation, rather than formatting the name based |
10077 | // on the "canonical" representation used to store the template |
10078 | // arguments in the specialization. |
10079 | TypeSourceInfo *WrittenTy |
10080 | = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, |
10081 | TemplateArgs, |
10082 | Context.getTypeDeclType(Specialization)); |
10083 | Specialization->setTypeAsWritten(WrittenTy); |
10084 | |
10085 | // Set source locations for keywords. |
10086 | Specialization->setExternLoc(ExternLoc); |
10087 | Specialization->setTemplateKeywordLoc(TemplateLoc); |
10088 | Specialization->setBraceRange(SourceRange()); |
10089 | |
10090 | bool PreviouslyDLLExported = Specialization->hasAttr<DLLExportAttr>(); |
10091 | ProcessDeclAttributeList(S, Specialization, Attr); |
10092 | |
10093 | // Add the explicit instantiation into its lexical context. However, |
10094 | // since explicit instantiations are never found by name lookup, we |
10095 | // just put it into the declaration context directly. |
10096 | Specialization->setLexicalDeclContext(CurContext); |
10097 | CurContext->addDecl(Specialization); |
10098 | |
10099 | // Syntax is now OK, so return if it has no other effect on semantics. |
10100 | if (HasNoEffect) { |
10101 | // Set the template specialization kind. |
10102 | Specialization->setTemplateSpecializationKind(TSK); |
10103 | return Specialization; |
10104 | } |
10105 | |
10106 | // C++ [temp.explicit]p3: |
10107 | // A definition of a class template or class member template |
10108 | // shall be in scope at the point of the explicit instantiation of |
10109 | // the class template or class member template. |
10110 | // |
10111 | // This check comes when we actually try to perform the |
10112 | // instantiation. |
10113 | ClassTemplateSpecializationDecl *Def |
10114 | = cast_or_null<ClassTemplateSpecializationDecl>( |
10115 | Specialization->getDefinition()); |
10116 | if (!Def) |
10117 | InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK); |
10118 | else if (TSK == TSK_ExplicitInstantiationDefinition) { |
10119 | MarkVTableUsed(TemplateNameLoc, Specialization, true); |
10120 | Specialization->setPointOfInstantiation(Def->getPointOfInstantiation()); |
10121 | } |
10122 | |
10123 | // Instantiate the members of this class template specialization. |
10124 | Def = cast_or_null<ClassTemplateSpecializationDecl>( |
10125 | Specialization->getDefinition()); |
10126 | if (Def) { |
10127 | TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind(); |
10128 | // Fix a TSK_ExplicitInstantiationDeclaration followed by a |
10129 | // TSK_ExplicitInstantiationDefinition |
10130 | if (Old_TSK == TSK_ExplicitInstantiationDeclaration && |
10131 | (TSK == TSK_ExplicitInstantiationDefinition || |
10132 | DLLImportExplicitInstantiationDef)) { |
10133 | // FIXME: Need to notify the ASTMutationListener that we did this. |
10134 | Def->setTemplateSpecializationKind(TSK); |
10135 | |
10136 | if (!getDLLAttr(Def) && getDLLAttr(Specialization) && |
10137 | (Context.getTargetInfo().shouldDLLImportComdatSymbols() && |
10138 | !Context.getTargetInfo().getTriple().isPS())) { |
10139 | // An explicit instantiation definition can add a dll attribute to a |
10140 | // template with a previous instantiation declaration. MinGW doesn't |
10141 | // allow this. |
10142 | auto *A = cast<InheritableAttr>( |
10143 | getDLLAttr(Specialization)->clone(getASTContext())); |
10144 | A->setInherited(true); |
10145 | Def->addAttr(A); |
10146 | dllExportImportClassTemplateSpecialization(*this, Def); |
10147 | } |
10148 | } |
10149 | |
10150 | // Fix a TSK_ImplicitInstantiation followed by a |
10151 | // TSK_ExplicitInstantiationDefinition |
10152 | bool NewlyDLLExported = |
10153 | !PreviouslyDLLExported && Specialization->hasAttr<DLLExportAttr>(); |
10154 | if (Old_TSK == TSK_ImplicitInstantiation && NewlyDLLExported && |
10155 | (Context.getTargetInfo().shouldDLLImportComdatSymbols() && |
10156 | !Context.getTargetInfo().getTriple().isPS())) { |
10157 | // An explicit instantiation definition can add a dll attribute to a |
10158 | // template with a previous implicit instantiation. MinGW doesn't allow |
10159 | // this. We limit clang to only adding dllexport, to avoid potentially |
10160 | // strange codegen behavior. For example, if we extend this conditional |
10161 | // to dllimport, and we have a source file calling a method on an |
10162 | // implicitly instantiated template class instance and then declaring a |
10163 | // dllimport explicit instantiation definition for the same template |
10164 | // class, the codegen for the method call will not respect the dllimport, |
10165 | // while it will with cl. The Def will already have the DLL attribute, |
10166 | // since the Def and Specialization will be the same in the case of |
10167 | // Old_TSK == TSK_ImplicitInstantiation, and we already added the |
10168 | // attribute to the Specialization; we just need to make it take effect. |
10169 | assert(Def == Specialization &&(static_cast <bool> (Def == Specialization && "Def and Specialization should match for implicit instantiation" ) ? void (0) : __assert_fail ("Def == Specialization && \"Def and Specialization should match for implicit instantiation\"" , "clang/lib/Sema/SemaTemplate.cpp", 10170, __extension__ __PRETTY_FUNCTION__ )) |
10170 | "Def and Specialization should match for implicit instantiation")(static_cast <bool> (Def == Specialization && "Def and Specialization should match for implicit instantiation" ) ? void (0) : __assert_fail ("Def == Specialization && \"Def and Specialization should match for implicit instantiation\"" , "clang/lib/Sema/SemaTemplate.cpp", 10170, __extension__ __PRETTY_FUNCTION__ )); |
10171 | dllExportImportClassTemplateSpecialization(*this, Def); |
10172 | } |
10173 | |
10174 | // In MinGW mode, export the template instantiation if the declaration |
10175 | // was marked dllexport. |
10176 | if (PrevDecl_TSK == TSK_ExplicitInstantiationDeclaration && |
10177 | Context.getTargetInfo().getTriple().isWindowsGNUEnvironment() && |
10178 | PrevDecl->hasAttr<DLLExportAttr>()) { |
10179 | dllExportImportClassTemplateSpecialization(*this, Def); |
10180 | } |
10181 | |
10182 | if (Def->hasAttr<MSInheritanceAttr>()) { |
10183 | Specialization->addAttr(Def->getAttr<MSInheritanceAttr>()); |
10184 | Consumer.AssignInheritanceModel(Specialization); |
10185 | } |
10186 | |
10187 | // Set the template specialization kind. Make sure it is set before |
10188 | // instantiating the members which will trigger ASTConsumer callbacks. |
10189 | Specialization->setTemplateSpecializationKind(TSK); |
10190 | InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK); |
10191 | } else { |
10192 | |
10193 | // Set the template specialization kind. |
10194 | Specialization->setTemplateSpecializationKind(TSK); |
10195 | } |
10196 | |
10197 | return Specialization; |
10198 | } |
10199 | |
10200 | // Explicit instantiation of a member class of a class template. |
10201 | DeclResult |
10202 | Sema::ActOnExplicitInstantiation(Scope *S, SourceLocation ExternLoc, |
10203 | SourceLocation TemplateLoc, unsigned TagSpec, |
10204 | SourceLocation KWLoc, CXXScopeSpec &SS, |
10205 | IdentifierInfo *Name, SourceLocation NameLoc, |
10206 | const ParsedAttributesView &Attr) { |
10207 | |
10208 | bool Owned = false; |
10209 | bool IsDependent = false; |
10210 | Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference, KWLoc, SS, Name, |
10211 | NameLoc, Attr, AS_none, /*ModulePrivateLoc=*/SourceLocation(), |
10212 | MultiTemplateParamsArg(), Owned, IsDependent, SourceLocation(), |
10213 | false, TypeResult(), /*IsTypeSpecifier*/ false, |
10214 | /*IsTemplateParamOrArg*/ false, /*OOK=*/OOK_Outside).get(); |
10215 | assert(!IsDependent && "explicit instantiation of dependent name not yet handled")(static_cast <bool> (!IsDependent && "explicit instantiation of dependent name not yet handled" ) ? void (0) : __assert_fail ("!IsDependent && \"explicit instantiation of dependent name not yet handled\"" , "clang/lib/Sema/SemaTemplate.cpp", 10215, __extension__ __PRETTY_FUNCTION__ )); |
10216 | |
10217 | if (!TagD) |
10218 | return true; |
10219 | |
10220 | TagDecl *Tag = cast<TagDecl>(TagD); |
10221 | assert(!Tag->isEnum() && "shouldn't see enumerations here")(static_cast <bool> (!Tag->isEnum() && "shouldn't see enumerations here" ) ? void (0) : __assert_fail ("!Tag->isEnum() && \"shouldn't see enumerations here\"" , "clang/lib/Sema/SemaTemplate.cpp", 10221, __extension__ __PRETTY_FUNCTION__ )); |
10222 | |
10223 | if (Tag->isInvalidDecl()) |
10224 | return true; |
10225 | |
10226 | CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag); |
10227 | CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); |
10228 | if (!Pattern) { |
10229 | Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type) |
10230 | << Context.getTypeDeclType(Record); |
10231 | Diag(Record->getLocation(), diag::note_nontemplate_decl_here); |
10232 | return true; |
10233 | } |
10234 | |
10235 | // C++0x [temp.explicit]p2: |
10236 | // If the explicit instantiation is for a class or member class, the |
10237 | // elaborated-type-specifier in the declaration shall include a |
10238 | // simple-template-id. |
10239 | // |
10240 | // C++98 has the same restriction, just worded differently. |
10241 | if (!ScopeSpecifierHasTemplateId(SS)) |
10242 | Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id) |
10243 | << Record << SS.getRange(); |
10244 | |
10245 | // C++0x [temp.explicit]p2: |
10246 | // There are two forms of explicit instantiation: an explicit instantiation |
10247 | // definition and an explicit instantiation declaration. An explicit |
10248 | // instantiation declaration begins with the extern keyword. [...] |
10249 | TemplateSpecializationKind TSK |
10250 | = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition |
10251 | : TSK_ExplicitInstantiationDeclaration; |
10252 | |
10253 | CheckExplicitInstantiation(*this, Record, NameLoc, true, TSK); |
10254 | |
10255 | // Verify that it is okay to explicitly instantiate here. |
10256 | CXXRecordDecl *PrevDecl |
10257 | = cast_or_null<CXXRecordDecl>(Record->getPreviousDecl()); |
10258 | if (!PrevDecl && Record->getDefinition()) |
10259 | PrevDecl = Record; |
10260 | if (PrevDecl) { |
10261 | MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo(); |
10262 | bool HasNoEffect = false; |
10263 | assert(MSInfo && "No member specialization information?")(static_cast <bool> (MSInfo && "No member specialization information?" ) ? void (0) : __assert_fail ("MSInfo && \"No member specialization information?\"" , "clang/lib/Sema/SemaTemplate.cpp", 10263, __extension__ __PRETTY_FUNCTION__ )); |
10264 | if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK, |
10265 | PrevDecl, |
10266 | MSInfo->getTemplateSpecializationKind(), |
10267 | MSInfo->getPointOfInstantiation(), |
10268 | HasNoEffect)) |
10269 | return true; |
10270 | if (HasNoEffect) |
10271 | return TagD; |
10272 | } |
10273 | |
10274 | CXXRecordDecl *RecordDef |
10275 | = cast_or_null<CXXRecordDecl>(Record->getDefinition()); |
10276 | if (!RecordDef) { |
10277 | // C++ [temp.explicit]p3: |
10278 | // A definition of a member class of a class template shall be in scope |
10279 | // at the point of an explicit instantiation of the member class. |
10280 | CXXRecordDecl *Def |
10281 | = cast_or_null<CXXRecordDecl>(Pattern->getDefinition()); |
10282 | if (!Def) { |
10283 | Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member) |
10284 | << 0 << Record->getDeclName() << Record->getDeclContext(); |
10285 | Diag(Pattern->getLocation(), diag::note_forward_declaration) |
10286 | << Pattern; |
10287 | return true; |
10288 | } else { |
10289 | if (InstantiateClass(NameLoc, Record, Def, |
10290 | getTemplateInstantiationArgs(Record), |
10291 | TSK)) |
10292 | return true; |
10293 | |
10294 | RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition()); |
10295 | if (!RecordDef) |
10296 | return true; |
10297 | } |
10298 | } |
10299 | |
10300 | // Instantiate all of the members of the class. |
10301 | InstantiateClassMembers(NameLoc, RecordDef, |
10302 | getTemplateInstantiationArgs(Record), TSK); |
10303 | |
10304 | if (TSK == TSK_ExplicitInstantiationDefinition) |
10305 | MarkVTableUsed(NameLoc, RecordDef, true); |
10306 | |
10307 | // FIXME: We don't have any representation for explicit instantiations of |
10308 | // member classes. Such a representation is not needed for compilation, but it |
10309 | // should be available for clients that want to see all of the declarations in |
10310 | // the source code. |
10311 | return TagD; |
10312 | } |
10313 | |
10314 | DeclResult Sema::ActOnExplicitInstantiation(Scope *S, |
10315 | SourceLocation ExternLoc, |
10316 | SourceLocation TemplateLoc, |
10317 | Declarator &D) { |
10318 | // Explicit instantiations always require a name. |
10319 | // TODO: check if/when DNInfo should replace Name. |
10320 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); |
10321 | DeclarationName Name = NameInfo.getName(); |
10322 | if (!Name) { |
10323 | if (!D.isInvalidType()) |
10324 | Diag(D.getDeclSpec().getBeginLoc(), |
10325 | diag::err_explicit_instantiation_requires_name) |
10326 | << D.getDeclSpec().getSourceRange() << D.getSourceRange(); |
10327 | |
10328 | return true; |
10329 | } |
10330 | |
10331 | // The scope passed in may not be a decl scope. Zip up the scope tree until |
10332 | // we find one that is. |
10333 | while ((S->getFlags() & Scope::DeclScope) == 0 || |
10334 | (S->getFlags() & Scope::TemplateParamScope) != 0) |
10335 | S = S->getParent(); |
10336 | |
10337 | // Determine the type of the declaration. |
10338 | TypeSourceInfo *T = GetTypeForDeclarator(D, S); |
10339 | QualType R = T->getType(); |
10340 | if (R.isNull()) |
10341 | return true; |
10342 | |
10343 | // C++ [dcl.stc]p1: |
10344 | // A storage-class-specifier shall not be specified in [...] an explicit |
10345 | // instantiation (14.7.2) directive. |
10346 | if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { |
10347 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef) |
10348 | << Name; |
10349 | return true; |
10350 | } else if (D.getDeclSpec().getStorageClassSpec() |
10351 | != DeclSpec::SCS_unspecified) { |
10352 | // Complain about then remove the storage class specifier. |
10353 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class) |
10354 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); |
10355 | |
10356 | D.getMutableDeclSpec().ClearStorageClassSpecs(); |
10357 | } |
10358 | |
10359 | // C++0x [temp.explicit]p1: |
10360 | // [...] An explicit instantiation of a function template shall not use the |
10361 | // inline or constexpr specifiers. |
10362 | // Presumably, this also applies to member functions of class templates as |
10363 | // well. |
10364 | if (D.getDeclSpec().isInlineSpecified()) |
10365 | Diag(D.getDeclSpec().getInlineSpecLoc(), |
10366 | getLangOpts().CPlusPlus11 ? |
10367 | diag::err_explicit_instantiation_inline : |
10368 | diag::warn_explicit_instantiation_inline_0x) |
10369 | << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); |
10370 | if (D.getDeclSpec().hasConstexprSpecifier() && R->isFunctionType()) |
10371 | // FIXME: Add a fix-it to remove the 'constexpr' and add a 'const' if one is |
10372 | // not already specified. |
10373 | Diag(D.getDeclSpec().getConstexprSpecLoc(), |
10374 | diag::err_explicit_instantiation_constexpr); |
10375 | |
10376 | // A deduction guide is not on the list of entities that can be explicitly |
10377 | // instantiated. |
10378 | if (Name.getNameKind() == DeclarationName::CXXDeductionGuideName) { |
10379 | Diag(D.getDeclSpec().getBeginLoc(), diag::err_deduction_guide_specialized) |
10380 | << /*explicit instantiation*/ 0; |
10381 | return true; |
10382 | } |
10383 | |
10384 | // C++0x [temp.explicit]p2: |
10385 | // There are two forms of explicit instantiation: an explicit instantiation |
10386 | // definition and an explicit instantiation declaration. An explicit |
10387 | // instantiation declaration begins with the extern keyword. [...] |
10388 | TemplateSpecializationKind TSK |
10389 | = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition |
10390 | : TSK_ExplicitInstantiationDeclaration; |
10391 | |
10392 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName); |
10393 | LookupParsedName(Previous, S, &D.getCXXScopeSpec()); |
10394 | |
10395 | if (!R->isFunctionType()) { |
10396 | // C++ [temp.explicit]p1: |
10397 | // A [...] static data member of a class template can be explicitly |
10398 | // instantiated from the member definition associated with its class |
10399 | // template. |
10400 | // C++1y [temp.explicit]p1: |
10401 | // A [...] variable [...] template specialization can be explicitly |
10402 | // instantiated from its template. |
10403 | if (Previous.isAmbiguous()) |
10404 | return true; |
10405 | |
10406 | VarDecl *Prev = Previous.getAsSingle<VarDecl>(); |
10407 | VarTemplateDecl *PrevTemplate = Previous.getAsSingle<VarTemplateDecl>(); |
10408 | |
10409 | if (!PrevTemplate) { |
10410 | if (!Prev || !Prev->isStaticDataMember()) { |
10411 | // We expect to see a static data member here. |
10412 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known) |
10413 | << Name; |
10414 | for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); |
10415 | P != PEnd; ++P) |
10416 | Diag((*P)->getLocation(), diag::note_explicit_instantiation_here); |
10417 | return true; |
10418 | } |
10419 | |
10420 | if (!Prev->getInstantiatedFromStaticDataMember()) { |
10421 | // FIXME: Check for explicit specialization? |
10422 | Diag(D.getIdentifierLoc(), |
10423 | diag::err_explicit_instantiation_data_member_not_instantiated) |
10424 | << Prev; |
10425 | Diag(Prev->getLocation(), diag::note_explicit_instantiation_here); |
10426 | // FIXME: Can we provide a note showing where this was declared? |
10427 | return true; |
10428 | } |
10429 | } else { |
10430 | // Explicitly instantiate a variable template. |
10431 | |
10432 | // C++1y [dcl.spec.auto]p6: |
10433 | // ... A program that uses auto or decltype(auto) in a context not |
10434 | // explicitly allowed in this section is ill-formed. |
10435 | // |
10436 | // This includes auto-typed variable template instantiations. |
10437 | if (R->isUndeducedType()) { |
10438 | Diag(T->getTypeLoc().getBeginLoc(), |
10439 | diag::err_auto_not_allowed_var_inst); |
10440 | return true; |
10441 | } |
10442 | |
10443 | if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) { |
10444 | // C++1y [temp.explicit]p3: |
10445 | // If the explicit instantiation is for a variable, the unqualified-id |
10446 | // in the declaration shall be a template-id. |
10447 | Diag(D.getIdentifierLoc(), |
10448 | diag::err_explicit_instantiation_without_template_id) |
10449 | << PrevTemplate; |
10450 | Diag(PrevTemplate->getLocation(), |
10451 | diag::note_explicit_instantiation_here); |
10452 | return true; |
10453 | } |
10454 | |
10455 | // Translate the parser's template argument list into our AST format. |
10456 | TemplateArgumentListInfo TemplateArgs = |
10457 | makeTemplateArgumentListInfo(*this, *D.getName().TemplateId); |
10458 | |
10459 | DeclResult Res = CheckVarTemplateId(PrevTemplate, TemplateLoc, |
10460 | D.getIdentifierLoc(), TemplateArgs); |
10461 | if (Res.isInvalid()) |
10462 | return true; |
10463 | |
10464 | if (!Res.isUsable()) { |
10465 | // We somehow specified dependent template arguments in an explicit |
10466 | // instantiation. This should probably only happen during error |
10467 | // recovery. |
10468 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_dependent); |
10469 | return true; |
10470 | } |
10471 | |
10472 | // Ignore access control bits, we don't need them for redeclaration |
10473 | // checking. |
10474 | Prev = cast<VarDecl>(Res.get()); |
10475 | } |
10476 | |
10477 | // C++0x [temp.explicit]p2: |
10478 | // If the explicit instantiation is for a member function, a member class |
10479 | // or a static data member of a class template specialization, the name of |
10480 | // the class template specialization in the qualified-id for the member |
10481 | // name shall be a simple-template-id. |
10482 | // |
10483 | // C++98 has the same restriction, just worded differently. |
10484 | // |
10485 | // This does not apply to variable template specializations, where the |
10486 | // template-id is in the unqualified-id instead. |
10487 | if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()) && !PrevTemplate) |
10488 | Diag(D.getIdentifierLoc(), |
10489 | diag::ext_explicit_instantiation_without_qualified_id) |
10490 | << Prev << D.getCXXScopeSpec().getRange(); |
10491 | |
10492 | CheckExplicitInstantiation(*this, Prev, D.getIdentifierLoc(), true, TSK); |
10493 | |
10494 | // Verify that it is okay to explicitly instantiate here. |
10495 | TemplateSpecializationKind PrevTSK = Prev->getTemplateSpecializationKind(); |
10496 | SourceLocation POI = Prev->getPointOfInstantiation(); |
10497 | bool HasNoEffect = false; |
10498 | if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev, |
10499 | PrevTSK, POI, HasNoEffect)) |
10500 | return true; |
10501 | |
10502 | if (!HasNoEffect) { |
10503 | // Instantiate static data member or variable template. |
10504 | Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); |
10505 | // Merge attributes. |
10506 | ProcessDeclAttributeList(S, Prev, D.getDeclSpec().getAttributes()); |
10507 | if (TSK == TSK_ExplicitInstantiationDefinition) |
10508 | InstantiateVariableDefinition(D.getIdentifierLoc(), Prev); |
10509 | } |
10510 | |
10511 | // Check the new variable specialization against the parsed input. |
10512 | if (PrevTemplate && !Context.hasSameType(Prev->getType(), R)) { |
10513 | Diag(T->getTypeLoc().getBeginLoc(), |
10514 | diag::err_invalid_var_template_spec_type) |
10515 | << 0 << PrevTemplate << R << Prev->getType(); |
10516 | Diag(PrevTemplate->getLocation(), diag::note_template_declared_here) |
10517 | << 2 << PrevTemplate->getDeclName(); |
10518 | return true; |
10519 | } |
10520 | |
10521 | // FIXME: Create an ExplicitInstantiation node? |
10522 | return (Decl*) nullptr; |
10523 | } |
10524 | |
10525 | // If the declarator is a template-id, translate the parser's template |
10526 | // argument list into our AST format. |
10527 | bool HasExplicitTemplateArgs = false; |
10528 | TemplateArgumentListInfo TemplateArgs; |
10529 | if (D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId) { |
10530 | TemplateArgs = makeTemplateArgumentListInfo(*this, *D.getName().TemplateId); |
10531 | HasExplicitTemplateArgs = true; |
10532 | } |
10533 | |
10534 | // C++ [temp.explicit]p1: |
10535 | // A [...] function [...] can be explicitly instantiated from its template. |
10536 | // A member function [...] of a class template can be explicitly |
10537 | // instantiated from the member definition associated with its class |
10538 | // template. |
10539 | UnresolvedSet<8> TemplateMatches; |
10540 | FunctionDecl *NonTemplateMatch = nullptr; |
10541 | TemplateSpecCandidateSet FailedCandidates(D.getIdentifierLoc()); |
10542 | for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); |
10543 | P != PEnd; ++P) { |
10544 | NamedDecl *Prev = *P; |
10545 | if (!HasExplicitTemplateArgs) { |
10546 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) { |
10547 | QualType Adjusted = adjustCCAndNoReturn(R, Method->getType(), |
10548 | /*AdjustExceptionSpec*/true); |
10549 | if (Context.hasSameUnqualifiedType(Method->getType(), Adjusted)) { |
10550 | if (Method->getPrimaryTemplate()) { |
10551 | TemplateMatches.addDecl(Method, P.getAccess()); |
10552 | } else { |
10553 | // FIXME: Can this assert ever happen? Needs a test. |
10554 | assert(!NonTemplateMatch && "Multiple NonTemplateMatches")(static_cast <bool> (!NonTemplateMatch && "Multiple NonTemplateMatches" ) ? void (0) : __assert_fail ("!NonTemplateMatch && \"Multiple NonTemplateMatches\"" , "clang/lib/Sema/SemaTemplate.cpp", 10554, __extension__ __PRETTY_FUNCTION__ )); |
10555 | NonTemplateMatch = Method; |
10556 | } |
10557 | } |
10558 | } |
10559 | } |
10560 | |
10561 | FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev); |
10562 | if (!FunTmpl) |
10563 | continue; |
10564 | |
10565 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); |
10566 | FunctionDecl *Specialization = nullptr; |
10567 | if (TemplateDeductionResult TDK |
10568 | = DeduceTemplateArguments(FunTmpl, |
10569 | (HasExplicitTemplateArgs ? &TemplateArgs |
10570 | : nullptr), |
10571 | R, Specialization, Info)) { |
10572 | // Keep track of almost-matches. |
10573 | FailedCandidates.addCandidate() |
10574 | .set(P.getPair(), FunTmpl->getTemplatedDecl(), |
10575 | MakeDeductionFailureInfo(Context, TDK, Info)); |
10576 | (void)TDK; |
10577 | continue; |
10578 | } |
10579 | |
10580 | // Target attributes are part of the cuda function signature, so |
10581 | // the cuda target of the instantiated function must match that of its |
10582 | // template. Given that C++ template deduction does not take |
10583 | // target attributes into account, we reject candidates here that |
10584 | // have a different target. |
10585 | if (LangOpts.CUDA && |
10586 | IdentifyCUDATarget(Specialization, |
10587 | /* IgnoreImplicitHDAttr = */ true) != |
10588 | IdentifyCUDATarget(D.getDeclSpec().getAttributes())) { |
10589 | FailedCandidates.addCandidate().set( |
10590 | P.getPair(), FunTmpl->getTemplatedDecl(), |
10591 | MakeDeductionFailureInfo(Context, TDK_CUDATargetMismatch, Info)); |
10592 | continue; |
10593 | } |
10594 | |
10595 | TemplateMatches.addDecl(Specialization, P.getAccess()); |
10596 | } |
10597 | |
10598 | FunctionDecl *Specialization = NonTemplateMatch; |
10599 | if (!Specialization) { |
10600 | // Find the most specialized function template specialization. |
10601 | UnresolvedSetIterator Result = getMostSpecialized( |
10602 | TemplateMatches.begin(), TemplateMatches.end(), FailedCandidates, |
10603 | D.getIdentifierLoc(), |
10604 | PDiag(diag::err_explicit_instantiation_not_known) << Name, |
10605 | PDiag(diag::err_explicit_instantiation_ambiguous) << Name, |
10606 | PDiag(diag::note_explicit_instantiation_candidate)); |
10607 | |
10608 | if (Result == TemplateMatches.end()) |
10609 | return true; |
10610 | |
10611 | // Ignore access control bits, we don't need them for redeclaration checking. |
10612 | Specialization = cast<FunctionDecl>(*Result); |
10613 | } |
10614 | |
10615 | // C++11 [except.spec]p4 |
10616 | // In an explicit instantiation an exception-specification may be specified, |
10617 | // but is not required. |
10618 | // If an exception-specification is specified in an explicit instantiation |
10619 | // directive, it shall be compatible with the exception-specifications of |
10620 | // other declarations of that function. |
10621 | if (auto *FPT = R->getAs<FunctionProtoType>()) |
10622 | if (FPT->hasExceptionSpec()) { |
10623 | unsigned DiagID = |
10624 | diag::err_mismatched_exception_spec_explicit_instantiation; |
10625 | if (getLangOpts().MicrosoftExt) |
10626 | DiagID = diag::ext_mismatched_exception_spec_explicit_instantiation; |
10627 | bool Result = CheckEquivalentExceptionSpec( |
10628 | PDiag(DiagID) << Specialization->getType(), |
10629 | PDiag(diag::note_explicit_instantiation_here), |
10630 | Specialization->getType()->getAs<FunctionProtoType>(), |
10631 | Specialization->getLocation(), FPT, D.getBeginLoc()); |
10632 | // In Microsoft mode, mismatching exception specifications just cause a |
10633 | // warning. |
10634 | if (!getLangOpts().MicrosoftExt && Result) |
10635 | return true; |
10636 | } |
10637 | |
10638 | if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) { |
10639 | Diag(D.getIdentifierLoc(), |
10640 | diag::err_explicit_instantiation_member_function_not_instantiated) |
10641 | << Specialization |
10642 | << (Specialization->getTemplateSpecializationKind() == |
10643 | TSK_ExplicitSpecialization); |
10644 | Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here); |
10645 | return true; |
10646 | } |
10647 | |
10648 | FunctionDecl *PrevDecl = Specialization->getPreviousDecl(); |
10649 | if (!PrevDecl && Specialization->isThisDeclarationADefinition()) |
10650 | PrevDecl = Specialization; |
10651 | |
10652 | if (PrevDecl) { |
10653 | bool HasNoEffect = false; |
10654 | if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, |
10655 | PrevDecl, |
10656 | PrevDecl->getTemplateSpecializationKind(), |
10657 | PrevDecl->getPointOfInstantiation(), |
10658 | HasNoEffect)) |
10659 | return true; |
10660 | |
10661 | // FIXME: We may still want to build some representation of this |
10662 | // explicit specialization. |
10663 | if (HasNoEffect) |
10664 | return (Decl*) nullptr; |
10665 | } |
10666 | |
10667 | // HACK: libc++ has a bug where it attempts to explicitly instantiate the |
10668 | // functions |
10669 | // valarray<size_t>::valarray(size_t) and |
10670 | // valarray<size_t>::~valarray() |
10671 | // that it declared to have internal linkage with the internal_linkage |
10672 | // attribute. Ignore the explicit instantiation declaration in this case. |
10673 | if (Specialization->hasAttr<InternalLinkageAttr>() && |
10674 | TSK == TSK_ExplicitInstantiationDeclaration) { |
10675 | if (auto *RD = dyn_cast<CXXRecordDecl>(Specialization->getDeclContext())) |
10676 | if (RD->getIdentifier() && RD->getIdentifier()->isStr("valarray") && |
10677 | RD->isInStdNamespace()) |
10678 | return (Decl*) nullptr; |
10679 | } |
10680 | |
10681 | ProcessDeclAttributeList(S, Specialization, D.getDeclSpec().getAttributes()); |
10682 | |
10683 | // In MSVC mode, dllimported explicit instantiation definitions are treated as |
10684 | // instantiation declarations. |
10685 | if (TSK == TSK_ExplicitInstantiationDefinition && |
10686 | Specialization->hasAttr<DLLImportAttr>() && |
10687 | Context.getTargetInfo().getCXXABI().isMicrosoft()) |
10688 | TSK = TSK_ExplicitInstantiationDeclaration; |
10689 | |
10690 | Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); |
10691 | |
10692 | if (Specialization->isDefined()) { |
10693 | // Let the ASTConsumer know that this function has been explicitly |
10694 | // instantiated now, and its linkage might have changed. |
10695 | Consumer.HandleTopLevelDecl(DeclGroupRef(Specialization)); |
10696 | } else if (TSK == TSK_ExplicitInstantiationDefinition) |
10697 | InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization); |
10698 | |
10699 | // C++0x [temp.explicit]p2: |
10700 | // If the explicit instantiation is for a member function, a member class |
10701 | // or a static data member of a class template specialization, the name of |
10702 | // the class template specialization in the qualified-id for the member |
10703 | // name shall be a simple-template-id. |
10704 | // |
10705 | // C++98 has the same restriction, just worded differently. |
10706 | FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate(); |
10707 | if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId && !FunTmpl && |
10708 | D.getCXXScopeSpec().isSet() && |
10709 | !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec())) |
10710 | Diag(D.getIdentifierLoc(), |
10711 | diag::ext_explicit_instantiation_without_qualified_id) |
10712 | << Specialization << D.getCXXScopeSpec().getRange(); |
10713 | |
10714 | CheckExplicitInstantiation( |
10715 | *this, |
10716 | FunTmpl ? (NamedDecl *)FunTmpl |
10717 | : Specialization->getInstantiatedFromMemberFunction(), |
10718 | D.getIdentifierLoc(), D.getCXXScopeSpec().isSet(), TSK); |
10719 | |
10720 | // FIXME: Create some kind of ExplicitInstantiationDecl here. |
10721 | return (Decl*) nullptr; |
10722 | } |
10723 | |
10724 | TypeResult |
10725 | Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK, |
10726 | const CXXScopeSpec &SS, IdentifierInfo *Name, |
10727 | SourceLocation TagLoc, SourceLocation NameLoc) { |
10728 | // This has to hold, because SS is expected to be defined. |
10729 | assert(Name && "Expected a name in a dependent tag")(static_cast <bool> (Name && "Expected a name in a dependent tag" ) ? void (0) : __assert_fail ("Name && \"Expected a name in a dependent tag\"" , "clang/lib/Sema/SemaTemplate.cpp", 10729, __extension__ __PRETTY_FUNCTION__ )); |
10730 | |
10731 | NestedNameSpecifier *NNS = SS.getScopeRep(); |
10732 | if (!NNS) |
10733 | return true; |
10734 | |
10735 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
10736 | |
10737 | if (TUK == TUK_Declaration || TUK == TUK_Definition) { |
10738 | Diag(NameLoc, diag::err_dependent_tag_decl) |
10739 | << (TUK == TUK_Definition) << Kind << SS.getRange(); |
10740 | return true; |
10741 | } |
10742 | |
10743 | // Create the resulting type. |
10744 | ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind); |
10745 | QualType Result = Context.getDependentNameType(Kwd, NNS, Name); |
10746 | |
10747 | // Create type-source location information for this type. |
10748 | TypeLocBuilder TLB; |
10749 | DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result); |
10750 | TL.setElaboratedKeywordLoc(TagLoc); |
10751 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
10752 | TL.setNameLoc(NameLoc); |
10753 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
10754 | } |
10755 | |
10756 | TypeResult Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc, |
10757 | const CXXScopeSpec &SS, |
10758 | const IdentifierInfo &II, |
10759 | SourceLocation IdLoc, |
10760 | ImplicitTypenameContext IsImplicitTypename) { |
10761 | if (SS.isInvalid()) |
10762 | return true; |
10763 | |
10764 | if (TypenameLoc.isValid() && S && !S->getTemplateParamParent()) |
10765 | Diag(TypenameLoc, |
10766 | getLangOpts().CPlusPlus11 ? |
10767 | diag::warn_cxx98_compat_typename_outside_of_template : |
10768 | diag::ext_typename_outside_of_template) |
10769 | << FixItHint::CreateRemoval(TypenameLoc); |
10770 | |
10771 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
10772 | TypeSourceInfo *TSI = nullptr; |
10773 | QualType T = |
10774 | CheckTypenameType((TypenameLoc.isValid() || |
10775 | IsImplicitTypename == ImplicitTypenameContext::Yes) |
10776 | ? ETK_Typename |
10777 | : ETK_None, |
10778 | TypenameLoc, QualifierLoc, II, IdLoc, &TSI, |
10779 | /*DeducedTSTContext=*/true); |
10780 | if (T.isNull()) |
10781 | return true; |
10782 | return CreateParsedType(T, TSI); |
10783 | } |
10784 | |
10785 | TypeResult |
10786 | Sema::ActOnTypenameType(Scope *S, |
10787 | SourceLocation TypenameLoc, |
10788 | const CXXScopeSpec &SS, |
10789 | SourceLocation TemplateKWLoc, |
10790 | TemplateTy TemplateIn, |
10791 | IdentifierInfo *TemplateII, |
10792 | SourceLocation TemplateIILoc, |
10793 | SourceLocation LAngleLoc, |
10794 | ASTTemplateArgsPtr TemplateArgsIn, |
10795 | SourceLocation RAngleLoc) { |
10796 | if (TypenameLoc.isValid() && S && !S->getTemplateParamParent()) |
10797 | Diag(TypenameLoc, |
10798 | getLangOpts().CPlusPlus11 ? |
10799 | diag::warn_cxx98_compat_typename_outside_of_template : |
10800 | diag::ext_typename_outside_of_template) |
10801 | << FixItHint::CreateRemoval(TypenameLoc); |
10802 | |
10803 | // Strangely, non-type results are not ignored by this lookup, so the |
10804 | // program is ill-formed if it finds an injected-class-name. |
10805 | if (TypenameLoc.isValid()) { |
10806 | auto *LookupRD = |
10807 | dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, false)); |
10808 | if (LookupRD && LookupRD->getIdentifier() == TemplateII) { |
10809 | Diag(TemplateIILoc, |
10810 | diag::ext_out_of_line_qualified_id_type_names_constructor) |
10811 | << TemplateII << 0 /*injected-class-name used as template name*/ |
10812 | << (TemplateKWLoc.isValid() ? 1 : 0 /*'template'/'typename' keyword*/); |
10813 | } |
10814 | } |
10815 | |
10816 | // Translate the parser's template argument list in our AST format. |
10817 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
10818 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
10819 | |
10820 | TemplateName Template = TemplateIn.get(); |
10821 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
10822 | // Construct a dependent template specialization type. |
10823 | assert(DTN && "dependent template has non-dependent name?")(static_cast <bool> (DTN && "dependent template has non-dependent name?" ) ? void (0) : __assert_fail ("DTN && \"dependent template has non-dependent name?\"" , "clang/lib/Sema/SemaTemplate.cpp", 10823, __extension__ __PRETTY_FUNCTION__ )); |
10824 | assert(DTN->getQualifier() == SS.getScopeRep())(static_cast <bool> (DTN->getQualifier() == SS.getScopeRep ()) ? void (0) : __assert_fail ("DTN->getQualifier() == SS.getScopeRep()" , "clang/lib/Sema/SemaTemplate.cpp", 10824, __extension__ __PRETTY_FUNCTION__ )); |
10825 | QualType T = Context.getDependentTemplateSpecializationType( |
10826 | ETK_Typename, DTN->getQualifier(), DTN->getIdentifier(), |
10827 | TemplateArgs.arguments()); |
10828 | |
10829 | // Create source-location information for this type. |
10830 | TypeLocBuilder Builder; |
10831 | DependentTemplateSpecializationTypeLoc SpecTL |
10832 | = Builder.push<DependentTemplateSpecializationTypeLoc>(T); |
10833 | SpecTL.setElaboratedKeywordLoc(TypenameLoc); |
10834 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
10835 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
10836 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
10837 | SpecTL.setLAngleLoc(LAngleLoc); |
10838 | SpecTL.setRAngleLoc(RAngleLoc); |
10839 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
10840 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
10841 | return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); |
10842 | } |
10843 | |
10844 | QualType T = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs); |
10845 | if (T.isNull()) |
10846 | return true; |
10847 | |
10848 | // Provide source-location information for the template specialization type. |
10849 | TypeLocBuilder Builder; |
10850 | TemplateSpecializationTypeLoc SpecTL |
10851 | = Builder.push<TemplateSpecializationTypeLoc>(T); |
10852 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
10853 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
10854 | SpecTL.setLAngleLoc(LAngleLoc); |
10855 | SpecTL.setRAngleLoc(RAngleLoc); |
10856 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
10857 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
10858 | |
10859 | T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T); |
10860 | ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T); |
10861 | TL.setElaboratedKeywordLoc(TypenameLoc); |
10862 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
10863 | |
10864 | TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T); |
10865 | return CreateParsedType(T, TSI); |
10866 | } |
10867 | |
10868 | |
10869 | /// Determine whether this failed name lookup should be treated as being |
10870 | /// disabled by a usage of std::enable_if. |
10871 | static bool isEnableIf(NestedNameSpecifierLoc NNS, const IdentifierInfo &II, |
10872 | SourceRange &CondRange, Expr *&Cond) { |
10873 | // We must be looking for a ::type... |
10874 | if (!II.isStr("type")) |
10875 | return false; |
10876 | |
10877 | // ... within an explicitly-written template specialization... |
10878 | if (!NNS || !NNS.getNestedNameSpecifier()->getAsType()) |
10879 | return false; |
10880 | TypeLoc EnableIfTy = NNS.getTypeLoc(); |
10881 | TemplateSpecializationTypeLoc EnableIfTSTLoc = |
10882 | EnableIfTy.getAs<TemplateSpecializationTypeLoc>(); |
10883 | if (!EnableIfTSTLoc || EnableIfTSTLoc.getNumArgs() == 0) |
10884 | return false; |
10885 | const TemplateSpecializationType *EnableIfTST = EnableIfTSTLoc.getTypePtr(); |
10886 | |
10887 | // ... which names a complete class template declaration... |
10888 | const TemplateDecl *EnableIfDecl = |
10889 | EnableIfTST->getTemplateName().getAsTemplateDecl(); |
10890 | if (!EnableIfDecl || EnableIfTST->isIncompleteType()) |
10891 | return false; |
10892 | |
10893 | // ... called "enable_if". |
10894 | const IdentifierInfo *EnableIfII = |
10895 | EnableIfDecl->getDeclName().getAsIdentifierInfo(); |
10896 | if (!EnableIfII || !EnableIfII->isStr("enable_if")) |
10897 | return false; |
10898 | |
10899 | // Assume the first template argument is the condition. |
10900 | CondRange = EnableIfTSTLoc.getArgLoc(0).getSourceRange(); |
10901 | |
10902 | // Dig out the condition. |
10903 | Cond = nullptr; |
10904 | if (EnableIfTSTLoc.getArgLoc(0).getArgument().getKind() |
10905 | != TemplateArgument::Expression) |
10906 | return true; |
10907 | |
10908 | Cond = EnableIfTSTLoc.getArgLoc(0).getSourceExpression(); |
10909 | |
10910 | // Ignore Boolean literals; they add no value. |
10911 | if (isa<CXXBoolLiteralExpr>(Cond->IgnoreParenCasts())) |
10912 | Cond = nullptr; |
10913 | |
10914 | return true; |
10915 | } |
10916 | |
10917 | QualType |
10918 | Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword, |
10919 | SourceLocation KeywordLoc, |
10920 | NestedNameSpecifierLoc QualifierLoc, |
10921 | const IdentifierInfo &II, |
10922 | SourceLocation IILoc, |
10923 | TypeSourceInfo **TSI, |
10924 | bool DeducedTSTContext) { |
10925 | QualType T = CheckTypenameType(Keyword, KeywordLoc, QualifierLoc, II, IILoc, |
10926 | DeducedTSTContext); |
10927 | if (T.isNull()) |
10928 | return QualType(); |
10929 | |
10930 | *TSI = Context.CreateTypeSourceInfo(T); |
10931 | if (isa<DependentNameType>(T)) { |
10932 | DependentNameTypeLoc TL = |
10933 | (*TSI)->getTypeLoc().castAs<DependentNameTypeLoc>(); |
10934 | TL.setElaboratedKeywordLoc(KeywordLoc); |
10935 | TL.setQualifierLoc(QualifierLoc); |
10936 | TL.setNameLoc(IILoc); |
10937 | } else { |
10938 | ElaboratedTypeLoc TL = (*TSI)->getTypeLoc().castAs<ElaboratedTypeLoc>(); |
10939 | TL.setElaboratedKeywordLoc(KeywordLoc); |
10940 | TL.setQualifierLoc(QualifierLoc); |
10941 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IILoc); |
10942 | } |
10943 | return T; |
10944 | } |
10945 | |
10946 | /// Build the type that describes a C++ typename specifier, |
10947 | /// e.g., "typename T::type". |
10948 | QualType |
10949 | Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword, |
10950 | SourceLocation KeywordLoc, |
10951 | NestedNameSpecifierLoc QualifierLoc, |
10952 | const IdentifierInfo &II, |
10953 | SourceLocation IILoc, bool DeducedTSTContext) { |
10954 | CXXScopeSpec SS; |
10955 | SS.Adopt(QualifierLoc); |
10956 | |
10957 | DeclContext *Ctx = nullptr; |
10958 | if (QualifierLoc) { |
10959 | Ctx = computeDeclContext(SS); |
10960 | if (!Ctx) { |
10961 | // If the nested-name-specifier is dependent and couldn't be |
10962 | // resolved to a type, build a typename type. |
10963 | assert(QualifierLoc.getNestedNameSpecifier()->isDependent())(static_cast <bool> (QualifierLoc.getNestedNameSpecifier ()->isDependent()) ? void (0) : __assert_fail ("QualifierLoc.getNestedNameSpecifier()->isDependent()" , "clang/lib/Sema/SemaTemplate.cpp", 10963, __extension__ __PRETTY_FUNCTION__ )); |
10964 | return Context.getDependentNameType(Keyword, |
10965 | QualifierLoc.getNestedNameSpecifier(), |
10966 | &II); |
10967 | } |
10968 | |
10969 | // If the nested-name-specifier refers to the current instantiation, |
10970 | // the "typename" keyword itself is superfluous. In C++03, the |
10971 | // program is actually ill-formed. However, DR 382 (in C++0x CD1) |
10972 | // allows such extraneous "typename" keywords, and we retroactively |
10973 | // apply this DR to C++03 code with only a warning. In any case we continue. |
10974 | |
10975 | if (RequireCompleteDeclContext(SS, Ctx)) |
10976 | return QualType(); |
10977 | } |
10978 | |
10979 | DeclarationName Name(&II); |
10980 | LookupResult Result(*this, Name, IILoc, LookupOrdinaryName); |
10981 | if (Ctx) |
10982 | LookupQualifiedName(Result, Ctx, SS); |
10983 | else |
10984 | LookupName(Result, CurScope); |
10985 | unsigned DiagID = 0; |
10986 | Decl *Referenced = nullptr; |
10987 | switch (Result.getResultKind()) { |
10988 | case LookupResult::NotFound: { |
10989 | // If we're looking up 'type' within a template named 'enable_if', produce |
10990 | // a more specific diagnostic. |
10991 | SourceRange CondRange; |
10992 | Expr *Cond = nullptr; |
10993 | if (Ctx && isEnableIf(QualifierLoc, II, CondRange, Cond)) { |
10994 | // If we have a condition, narrow it down to the specific failed |
10995 | // condition. |
10996 | if (Cond) { |
10997 | Expr *FailedCond; |
10998 | std::string FailedDescription; |
10999 | std::tie(FailedCond, FailedDescription) = |
11000 | findFailedBooleanCondition(Cond); |
11001 | |
11002 | Diag(FailedCond->getExprLoc(), |
11003 | diag::err_typename_nested_not_found_requirement) |
11004 | << FailedDescription |
11005 | << FailedCond->getSourceRange(); |
11006 | return QualType(); |
11007 | } |
11008 | |
11009 | Diag(CondRange.getBegin(), |
11010 | diag::err_typename_nested_not_found_enable_if) |
11011 | << Ctx << CondRange; |
11012 | return QualType(); |
11013 | } |
11014 | |
11015 | DiagID = Ctx ? diag::err_typename_nested_not_found |
11016 | : diag::err_unknown_typename; |
11017 | break; |
11018 | } |
11019 | |
11020 | case LookupResult::FoundUnresolvedValue: { |
11021 | // We found a using declaration that is a value. Most likely, the using |
11022 | // declaration itself is meant to have the 'typename' keyword. |
11023 | SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), |
11024 | IILoc); |
11025 | Diag(IILoc, diag::err_typename_refers_to_using_value_decl) |
11026 | << Name << Ctx << FullRange; |
11027 | if (UnresolvedUsingValueDecl *Using |
11028 | = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){ |
11029 | SourceLocation Loc = Using->getQualifierLoc().getBeginLoc(); |
11030 | Diag(Loc, diag::note_using_value_decl_missing_typename) |
11031 | << FixItHint::CreateInsertion(Loc, "typename "); |
11032 | } |
11033 | } |
11034 | // Fall through to create a dependent typename type, from which we can recover |
11035 | // better. |
11036 | [[fallthrough]]; |
11037 | |
11038 | case LookupResult::NotFoundInCurrentInstantiation: |
11039 | // Okay, it's a member of an unknown instantiation. |
11040 | return Context.getDependentNameType(Keyword, |
11041 | QualifierLoc.getNestedNameSpecifier(), |
11042 | &II); |
11043 | |
11044 | case LookupResult::Found: |
11045 | if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) { |
11046 | // C++ [class.qual]p2: |
11047 | // In a lookup in which function names are not ignored and the |
11048 | // nested-name-specifier nominates a class C, if the name specified |
11049 | // after the nested-name-specifier, when looked up in C, is the |
11050 | // injected-class-name of C [...] then the name is instead considered |
11051 | // to name the constructor of class C. |
11052 | // |
11053 | // Unlike in an elaborated-type-specifier, function names are not ignored |
11054 | // in typename-specifier lookup. However, they are ignored in all the |
11055 | // contexts where we form a typename type with no keyword (that is, in |
11056 | // mem-initializer-ids, base-specifiers, and elaborated-type-specifiers). |
11057 | // |
11058 | // FIXME: That's not strictly true: mem-initializer-id lookup does not |
11059 | // ignore functions, but that appears to be an oversight. |
11060 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(Ctx); |
11061 | auto *FoundRD = dyn_cast<CXXRecordDecl>(Type); |
11062 | if (Keyword == ETK_Typename && LookupRD && FoundRD && |
11063 | FoundRD->isInjectedClassName() && |
11064 | declaresSameEntity(LookupRD, cast<Decl>(FoundRD->getParent()))) |
11065 | Diag(IILoc, diag::ext_out_of_line_qualified_id_type_names_constructor) |
11066 | << &II << 1 << 0 /*'typename' keyword used*/; |
11067 | |
11068 | // We found a type. Build an ElaboratedType, since the |
11069 | // typename-specifier was just sugar. |
11070 | MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false); |
11071 | return Context.getElaboratedType(Keyword, |
11072 | QualifierLoc.getNestedNameSpecifier(), |
11073 | Context.getTypeDeclType(Type)); |
11074 | } |
11075 | |
11076 | // C++ [dcl.type.simple]p2: |
11077 | // A type-specifier of the form |
11078 | // typename[opt] nested-name-specifier[opt] template-name |
11079 | // is a placeholder for a deduced class type [...]. |
11080 | if (getLangOpts().CPlusPlus17) { |
11081 | if (auto *TD = getAsTypeTemplateDecl(Result.getFoundDecl())) { |
11082 | if (!DeducedTSTContext) { |
11083 | QualType T(QualifierLoc |
11084 | ? QualifierLoc.getNestedNameSpecifier()->getAsType() |
11085 | : nullptr, 0); |
11086 | if (!T.isNull()) |
11087 | Diag(IILoc, diag::err_dependent_deduced_tst) |
11088 | << (int)getTemplateNameKindForDiagnostics(TemplateName(TD)) << T; |
11089 | else |
11090 | Diag(IILoc, diag::err_deduced_tst) |
11091 | << (int)getTemplateNameKindForDiagnostics(TemplateName(TD)); |
11092 | Diag(TD->getLocation(), diag::note_template_decl_here); |
11093 | return QualType(); |
11094 | } |
11095 | return Context.getElaboratedType( |
11096 | Keyword, QualifierLoc.getNestedNameSpecifier(), |
11097 | Context.getDeducedTemplateSpecializationType(TemplateName(TD), |
11098 | QualType(), false)); |
11099 | } |
11100 | } |
11101 | |
11102 | DiagID = Ctx ? diag::err_typename_nested_not_type |
11103 | : diag::err_typename_not_type; |
11104 | Referenced = Result.getFoundDecl(); |
11105 | break; |
11106 | |
11107 | case LookupResult::FoundOverloaded: |
11108 | DiagID = Ctx ? diag::err_typename_nested_not_type |
11109 | : diag::err_typename_not_type; |
11110 | Referenced = *Result.begin(); |
11111 | break; |
11112 | |
11113 | case LookupResult::Ambiguous: |
11114 | return QualType(); |
11115 | } |
11116 | |
11117 | // If we get here, it's because name lookup did not find a |
11118 | // type. Emit an appropriate diagnostic and return an error. |
11119 | SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), |
11120 | IILoc); |
11121 | if (Ctx) |
11122 | Diag(IILoc, DiagID) << FullRange << Name << Ctx; |
11123 | else |
11124 | Diag(IILoc, DiagID) << FullRange << Name; |
11125 | if (Referenced) |
11126 | Diag(Referenced->getLocation(), |
11127 | Ctx ? diag::note_typename_member_refers_here |
11128 | : diag::note_typename_refers_here) |
11129 | << Name; |
11130 | return QualType(); |
11131 | } |
11132 | |
11133 | namespace { |
11134 | // See Sema::RebuildTypeInCurrentInstantiation |
11135 | class CurrentInstantiationRebuilder |
11136 | : public TreeTransform<CurrentInstantiationRebuilder> { |
11137 | SourceLocation Loc; |
11138 | DeclarationName Entity; |
11139 | |
11140 | public: |
11141 | typedef TreeTransform<CurrentInstantiationRebuilder> inherited; |
11142 | |
11143 | CurrentInstantiationRebuilder(Sema &SemaRef, |
11144 | SourceLocation Loc, |
11145 | DeclarationName Entity) |
11146 | : TreeTransform<CurrentInstantiationRebuilder>(SemaRef), |
11147 | Loc(Loc), Entity(Entity) { } |
11148 | |
11149 | /// Determine whether the given type \p T has already been |
11150 | /// transformed. |
11151 | /// |
11152 | /// For the purposes of type reconstruction, a type has already been |
11153 | /// transformed if it is NULL or if it is not dependent. |
11154 | bool AlreadyTransformed(QualType T) { |
11155 | return T.isNull() || !T->isInstantiationDependentType(); |
11156 | } |
11157 | |
11158 | /// Returns the location of the entity whose type is being |
11159 | /// rebuilt. |
11160 | SourceLocation getBaseLocation() { return Loc; } |
11161 | |
11162 | /// Returns the name of the entity whose type is being rebuilt. |
11163 | DeclarationName getBaseEntity() { return Entity; } |
11164 | |
11165 | /// Sets the "base" location and entity when that |
11166 | /// information is known based on another transformation. |
11167 | void setBase(SourceLocation Loc, DeclarationName Entity) { |
11168 | this->Loc = Loc; |
11169 | this->Entity = Entity; |
11170 | } |
11171 | |
11172 | ExprResult TransformLambdaExpr(LambdaExpr *E) { |
11173 | // Lambdas never need to be transformed. |
11174 | return E; |
11175 | } |
11176 | }; |
11177 | } // end anonymous namespace |
11178 | |
11179 | /// Rebuilds a type within the context of the current instantiation. |
11180 | /// |
11181 | /// The type \p T is part of the type of an out-of-line member definition of |
11182 | /// a class template (or class template partial specialization) that was parsed |
11183 | /// and constructed before we entered the scope of the class template (or |
11184 | /// partial specialization thereof). This routine will rebuild that type now |
11185 | /// that we have entered the declarator's scope, which may produce different |
11186 | /// canonical types, e.g., |
11187 | /// |
11188 | /// \code |
11189 | /// template<typename T> |
11190 | /// struct X { |
11191 | /// typedef T* pointer; |
11192 | /// pointer data(); |
11193 | /// }; |
11194 | /// |
11195 | /// template<typename T> |
11196 | /// typename X<T>::pointer X<T>::data() { ... } |
11197 | /// \endcode |
11198 | /// |
11199 | /// Here, the type "typename X<T>::pointer" will be created as a DependentNameType, |
11200 | /// since we do not know that we can look into X<T> when we parsed the type. |
11201 | /// This function will rebuild the type, performing the lookup of "pointer" |
11202 | /// in X<T> and returning an ElaboratedType whose canonical type is the same |
11203 | /// as the canonical type of T*, allowing the return types of the out-of-line |
11204 | /// definition and the declaration to match. |
11205 | TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T, |
11206 | SourceLocation Loc, |
11207 | DeclarationName Name) { |
11208 | if (!T || !T->getType()->isInstantiationDependentType()) |
11209 | return T; |
11210 | |
11211 | CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name); |
11212 | return Rebuilder.TransformType(T); |
11213 | } |
11214 | |
11215 | ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) { |
11216 | CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(), |
11217 | DeclarationName()); |
11218 | return Rebuilder.TransformExpr(E); |
11219 | } |
11220 | |
11221 | bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) { |
11222 | if (SS.isInvalid()) |
11223 | return true; |
11224 | |
11225 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
11226 | CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(), |
11227 | DeclarationName()); |
11228 | NestedNameSpecifierLoc Rebuilt |
11229 | = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc); |
11230 | if (!Rebuilt) |
11231 | return true; |
11232 | |
11233 | SS.Adopt(Rebuilt); |
11234 | return false; |
11235 | } |
11236 | |
11237 | /// Rebuild the template parameters now that we know we're in a current |
11238 | /// instantiation. |
11239 | bool Sema::RebuildTemplateParamsInCurrentInstantiation( |
11240 | TemplateParameterList *Params) { |
11241 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
11242 | Decl *Param = Params->getParam(I); |
11243 | |
11244 | // There is nothing to rebuild in a type parameter. |
11245 | if (isa<TemplateTypeParmDecl>(Param)) |
11246 | continue; |
11247 | |
11248 | // Rebuild the template parameter list of a template template parameter. |
11249 | if (TemplateTemplateParmDecl *TTP |
11250 | = dyn_cast<TemplateTemplateParmDecl>(Param)) { |
11251 | if (RebuildTemplateParamsInCurrentInstantiation( |
11252 | TTP->getTemplateParameters())) |
11253 | return true; |
11254 | |
11255 | continue; |
11256 | } |
11257 | |
11258 | // Rebuild the type of a non-type template parameter. |
11259 | NonTypeTemplateParmDecl *NTTP = cast<NonTypeTemplateParmDecl>(Param); |
11260 | TypeSourceInfo *NewTSI |
11261 | = RebuildTypeInCurrentInstantiation(NTTP->getTypeSourceInfo(), |
11262 | NTTP->getLocation(), |
11263 | NTTP->getDeclName()); |
11264 | if (!NewTSI) |
11265 | return true; |
11266 | |
11267 | if (NewTSI->getType()->isUndeducedType()) { |
11268 | // C++17 [temp.dep.expr]p3: |
11269 | // An id-expression is type-dependent if it contains |
11270 | // - an identifier associated by name lookup with a non-type |
11271 | // template-parameter declared with a type that contains a |
11272 | // placeholder type (7.1.7.4), |
11273 | NewTSI = SubstAutoTypeSourceInfoDependent(NewTSI); |
11274 | } |
11275 | |
11276 | if (NewTSI != NTTP->getTypeSourceInfo()) { |
11277 | NTTP->setTypeSourceInfo(NewTSI); |
11278 | NTTP->setType(NewTSI->getType()); |
11279 | } |
11280 | } |
11281 | |
11282 | return false; |
11283 | } |
11284 | |
11285 | /// Produces a formatted string that describes the binding of |
11286 | /// template parameters to template arguments. |
11287 | std::string |
11288 | Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, |
11289 | const TemplateArgumentList &Args) { |
11290 | return getTemplateArgumentBindingsText(Params, Args.data(), Args.size()); |
11291 | } |
11292 | |
11293 | std::string |
11294 | Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, |
11295 | const TemplateArgument *Args, |
11296 | unsigned NumArgs) { |
11297 | SmallString<128> Str; |
11298 | llvm::raw_svector_ostream Out(Str); |
11299 | |
11300 | if (!Params || Params->size() == 0 || NumArgs == 0) |
11301 | return std::string(); |
11302 | |
11303 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
11304 | if (I >= NumArgs) |
11305 | break; |
11306 | |
11307 | if (I == 0) |
11308 | Out << "[with "; |
11309 | else |
11310 | Out << ", "; |
11311 | |
11312 | if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) { |
11313 | Out << Id->getName(); |
11314 | } else { |
11315 | Out << '$' << I; |
11316 | } |
11317 | |
11318 | Out << " = "; |
11319 | Args[I].print(getPrintingPolicy(), Out, |
11320 | TemplateParameterList::shouldIncludeTypeForArgument( |
11321 | getPrintingPolicy(), Params, I)); |
11322 | } |
11323 | |
11324 | Out << ']'; |
11325 | return std::string(Out.str()); |
11326 | } |
11327 | |
11328 | void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD, |
11329 | CachedTokens &Toks) { |
11330 | if (!FD) |
11331 | return; |
11332 | |
11333 | auto LPT = std::make_unique<LateParsedTemplate>(); |
11334 | |
11335 | // Take tokens to avoid allocations |
11336 | LPT->Toks.swap(Toks); |
11337 | LPT->D = FnD; |
11338 | LateParsedTemplateMap.insert(std::make_pair(FD, std::move(LPT))); |
11339 | |
11340 | FD->setLateTemplateParsed(true); |
11341 | } |
11342 | |
11343 | void Sema::UnmarkAsLateParsedTemplate(FunctionDecl *FD) { |
11344 | if (!FD) |
11345 | return; |
11346 | FD->setLateTemplateParsed(false); |
11347 | } |
11348 | |
11349 | bool Sema::IsInsideALocalClassWithinATemplateFunction() { |
11350 | DeclContext *DC = CurContext; |
11351 | |
11352 | while (DC) { |
11353 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { |
11354 | const FunctionDecl *FD = RD->isLocalClass(); |
11355 | return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate); |
11356 | } else if (DC->isTranslationUnit() || DC->isNamespace()) |
11357 | return false; |
11358 | |
11359 | DC = DC->getParent(); |
11360 | } |
11361 | return false; |
11362 | } |
11363 | |
11364 | namespace { |
11365 | /// Walk the path from which a declaration was instantiated, and check |
11366 | /// that every explicit specialization along that path is visible. This enforces |
11367 | /// C++ [temp.expl.spec]/6: |
11368 | /// |
11369 | /// If a template, a member template or a member of a class template is |
11370 | /// explicitly specialized then that specialization shall be declared before |
11371 | /// the first use of that specialization that would cause an implicit |
11372 | /// instantiation to take place, in every translation unit in which such a |
11373 | /// use occurs; no diagnostic is required. |
11374 | /// |
11375 | /// and also C++ [temp.class.spec]/1: |
11376 | /// |
11377 | /// A partial specialization shall be declared before the first use of a |
11378 | /// class template specialization that would make use of the partial |
11379 | /// specialization as the result of an implicit or explicit instantiation |
11380 | /// in every translation unit in which such a use occurs; no diagnostic is |
11381 | /// required. |
11382 | class ExplicitSpecializationVisibilityChecker { |
11383 | Sema &S; |
11384 | SourceLocation Loc; |
11385 | llvm::SmallVector<Module *, 8> Modules; |
11386 | Sema::AcceptableKind Kind; |
11387 | |
11388 | public: |
11389 | ExplicitSpecializationVisibilityChecker(Sema &S, SourceLocation Loc, |
11390 | Sema::AcceptableKind Kind) |
11391 | : S(S), Loc(Loc), Kind(Kind) {} |
11392 | |
11393 | void check(NamedDecl *ND) { |
11394 | if (auto *FD = dyn_cast<FunctionDecl>(ND)) |
11395 | return checkImpl(FD); |
11396 | if (auto *RD = dyn_cast<CXXRecordDecl>(ND)) |
11397 | return checkImpl(RD); |
11398 | if (auto *VD = dyn_cast<VarDecl>(ND)) |
11399 | return checkImpl(VD); |
11400 | if (auto *ED = dyn_cast<EnumDecl>(ND)) |
11401 | return checkImpl(ED); |
11402 | } |
11403 | |
11404 | private: |
11405 | void diagnose(NamedDecl *D, bool IsPartialSpec) { |
11406 | auto Kind = IsPartialSpec ? Sema::MissingImportKind::PartialSpecialization |
11407 | : Sema::MissingImportKind::ExplicitSpecialization; |
11408 | const bool Recover = true; |
11409 | |
11410 | // If we got a custom set of modules (because only a subset of the |
11411 | // declarations are interesting), use them, otherwise let |
11412 | // diagnoseMissingImport intelligently pick some. |
11413 | if (Modules.empty()) |
11414 | S.diagnoseMissingImport(Loc, D, Kind, Recover); |
11415 | else |
11416 | S.diagnoseMissingImport(Loc, D, D->getLocation(), Modules, Kind, Recover); |
11417 | } |
11418 | |
11419 | bool CheckMemberSpecialization(const NamedDecl *D) { |
11420 | return Kind == Sema::AcceptableKind::Visible |
11421 | ? S.hasVisibleMemberSpecialization(D) |
11422 | : S.hasReachableMemberSpecialization(D); |
11423 | } |
11424 | |
11425 | bool CheckExplicitSpecialization(const NamedDecl *D) { |
11426 | return Kind == Sema::AcceptableKind::Visible |
11427 | ? S.hasVisibleExplicitSpecialization(D) |
11428 | : S.hasReachableExplicitSpecialization(D); |
11429 | } |
11430 | |
11431 | bool CheckDeclaration(const NamedDecl *D) { |
11432 | return Kind == Sema::AcceptableKind::Visible ? S.hasVisibleDeclaration(D) |
11433 | : S.hasReachableDeclaration(D); |
11434 | } |
11435 | |
11436 | // Check a specific declaration. There are three problematic cases: |
11437 | // |
11438 | // 1) The declaration is an explicit specialization of a template |
11439 | // specialization. |
11440 | // 2) The declaration is an explicit specialization of a member of an |
11441 | // templated class. |
11442 | // 3) The declaration is an instantiation of a template, and that template |
11443 | // is an explicit specialization of a member of a templated class. |
11444 | // |
11445 | // We don't need to go any deeper than that, as the instantiation of the |
11446 | // surrounding class / etc is not triggered by whatever triggered this |
11447 | // instantiation, and thus should be checked elsewhere. |
11448 | template<typename SpecDecl> |
11449 | void checkImpl(SpecDecl *Spec) { |
11450 | bool IsHiddenExplicitSpecialization = false; |
11451 | if (Spec->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) { |
11452 | IsHiddenExplicitSpecialization = Spec->getMemberSpecializationInfo() |
11453 | ? !CheckMemberSpecialization(Spec) |
11454 | : !CheckExplicitSpecialization(Spec); |
11455 | } else { |
11456 | checkInstantiated(Spec); |
11457 | } |
11458 | |
11459 | if (IsHiddenExplicitSpecialization) |
11460 | diagnose(Spec->getMostRecentDecl(), false); |
11461 | } |
11462 | |
11463 | void checkInstantiated(FunctionDecl *FD) { |
11464 | if (auto *TD = FD->getPrimaryTemplate()) |
11465 | checkTemplate(TD); |
11466 | } |
11467 | |
11468 | void checkInstantiated(CXXRecordDecl *RD) { |
11469 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD); |
11470 | if (!SD) |
11471 | return; |
11472 | |
11473 | auto From = SD->getSpecializedTemplateOrPartial(); |
11474 | if (auto *TD = From.dyn_cast<ClassTemplateDecl *>()) |
11475 | checkTemplate(TD); |
11476 | else if (auto *TD = |
11477 | From.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) { |
11478 | if (!CheckDeclaration(TD)) |
11479 | diagnose(TD, true); |
11480 | checkTemplate(TD); |
11481 | } |
11482 | } |
11483 | |
11484 | void checkInstantiated(VarDecl *RD) { |
11485 | auto *SD = dyn_cast<VarTemplateSpecializationDecl>(RD); |
11486 | if (!SD) |
11487 | return; |
11488 | |
11489 | auto From = SD->getSpecializedTemplateOrPartial(); |
11490 | if (auto *TD = From.dyn_cast<VarTemplateDecl *>()) |
11491 | checkTemplate(TD); |
11492 | else if (auto *TD = |
11493 | From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) { |
11494 | if (!CheckDeclaration(TD)) |
11495 | diagnose(TD, true); |
11496 | checkTemplate(TD); |
11497 | } |
11498 | } |
11499 | |
11500 | void checkInstantiated(EnumDecl *FD) {} |
11501 | |
11502 | template<typename TemplDecl> |
11503 | void checkTemplate(TemplDecl *TD) { |
11504 | if (TD->isMemberSpecialization()) { |
11505 | if (!CheckMemberSpecialization(TD)) |
11506 | diagnose(TD->getMostRecentDecl(), false); |
11507 | } |
11508 | } |
11509 | }; |
11510 | } // end anonymous namespace |
11511 | |
11512 | void Sema::checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec) { |
11513 | if (!getLangOpts().Modules) |
11514 | return; |
11515 | |
11516 | ExplicitSpecializationVisibilityChecker(*this, Loc, |
11517 | Sema::AcceptableKind::Visible) |
11518 | .check(Spec); |
11519 | } |
11520 | |
11521 | void Sema::checkSpecializationReachability(SourceLocation Loc, |
11522 | NamedDecl *Spec) { |
11523 | if (!getLangOpts().CPlusPlusModules) |
11524 | return checkSpecializationVisibility(Loc, Spec); |
11525 | |
11526 | ExplicitSpecializationVisibilityChecker(*this, Loc, |
11527 | Sema::AcceptableKind::Reachable) |
11528 | .check(Spec); |
11529 | } |