File: | tools/clang/include/clang/AST/DeclTemplate.h |
Warning: | line 2737, column 31 Access to field 'PartialSpecialization' results in a dereference of a null pointer (loaded from variable 'PS') |
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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/DeclFriend.h" | |||
15 | #include "clang/AST/DeclTemplate.h" | |||
16 | #include "clang/AST/Expr.h" | |||
17 | #include "clang/AST/ExprCXX.h" | |||
18 | #include "clang/AST/RecursiveASTVisitor.h" | |||
19 | #include "clang/AST/TypeVisitor.h" | |||
20 | #include "clang/Basic/Builtins.h" | |||
21 | #include "clang/Basic/LangOptions.h" | |||
22 | #include "clang/Basic/PartialDiagnostic.h" | |||
23 | #include "clang/Basic/TargetInfo.h" | |||
24 | #include "clang/Sema/DeclSpec.h" | |||
25 | #include "clang/Sema/Lookup.h" | |||
26 | #include "clang/Sema/ParsedTemplate.h" | |||
27 | #include "clang/Sema/Scope.h" | |||
28 | #include "clang/Sema/SemaInternal.h" | |||
29 | #include "clang/Sema/Template.h" | |||
30 | #include "clang/Sema/TemplateDeduction.h" | |||
31 | #include "llvm/ADT/SmallBitVector.h" | |||
32 | #include "llvm/ADT/SmallString.h" | |||
33 | #include "llvm/ADT/StringExtras.h" | |||
34 | ||||
35 | #include <iterator> | |||
36 | using namespace clang; | |||
37 | using namespace sema; | |||
38 | ||||
39 | // Exported for use by Parser. | |||
40 | SourceRange | |||
41 | clang::getTemplateParamsRange(TemplateParameterList const * const *Ps, | |||
42 | unsigned N) { | |||
43 | if (!N) return SourceRange(); | |||
44 | return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc()); | |||
45 | } | |||
46 | ||||
47 | namespace clang { | |||
48 | /// [temp.constr.decl]p2: A template's associated constraints are | |||
49 | /// defined as a single constraint-expression derived from the introduced | |||
50 | /// constraint-expressions [ ... ]. | |||
51 | /// | |||
52 | /// \param Params The template parameter list and optional requires-clause. | |||
53 | /// | |||
54 | /// \param FD The underlying templated function declaration for a function | |||
55 | /// template. | |||
56 | static Expr *formAssociatedConstraints(TemplateParameterList *Params, | |||
57 | FunctionDecl *FD); | |||
58 | } | |||
59 | ||||
60 | static Expr *clang::formAssociatedConstraints(TemplateParameterList *Params, | |||
61 | FunctionDecl *FD) { | |||
62 | // FIXME: Concepts: collect additional introduced constraint-expressions | |||
63 | assert(!FD && "Cannot collect constraints from function declaration yet.")((!FD && "Cannot collect constraints from function declaration yet." ) ? static_cast<void> (0) : __assert_fail ("!FD && \"Cannot collect constraints from function declaration yet.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 63, __PRETTY_FUNCTION__)); | |||
64 | return Params->getRequiresClause(); | |||
65 | } | |||
66 | ||||
67 | /// Determine whether the declaration found is acceptable as the name | |||
68 | /// of a template and, if so, return that template declaration. Otherwise, | |||
69 | /// returns null. | |||
70 | /// | |||
71 | /// Note that this may return an UnresolvedUsingValueDecl if AllowDependent | |||
72 | /// is true. In all other cases it will return a TemplateDecl (or null). | |||
73 | NamedDecl *Sema::getAsTemplateNameDecl(NamedDecl *D, | |||
74 | bool AllowFunctionTemplates, | |||
75 | bool AllowDependent) { | |||
76 | D = D->getUnderlyingDecl(); | |||
77 | ||||
78 | if (isa<TemplateDecl>(D)) { | |||
79 | if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D)) | |||
80 | return nullptr; | |||
81 | ||||
82 | return D; | |||
83 | } | |||
84 | ||||
85 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) { | |||
86 | // C++ [temp.local]p1: | |||
87 | // Like normal (non-template) classes, class templates have an | |||
88 | // injected-class-name (Clause 9). The injected-class-name | |||
89 | // can be used with or without a template-argument-list. When | |||
90 | // it is used without a template-argument-list, it is | |||
91 | // equivalent to the injected-class-name followed by the | |||
92 | // template-parameters of the class template enclosed in | |||
93 | // <>. When it is used with a template-argument-list, it | |||
94 | // refers to the specified class template specialization, | |||
95 | // which could be the current specialization or another | |||
96 | // specialization. | |||
97 | if (Record->isInjectedClassName()) { | |||
98 | Record = cast<CXXRecordDecl>(Record->getDeclContext()); | |||
99 | if (Record->getDescribedClassTemplate()) | |||
100 | return Record->getDescribedClassTemplate(); | |||
101 | ||||
102 | if (ClassTemplateSpecializationDecl *Spec | |||
103 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) | |||
104 | return Spec->getSpecializedTemplate(); | |||
105 | } | |||
106 | ||||
107 | return nullptr; | |||
108 | } | |||
109 | ||||
110 | // 'using Dependent::foo;' can resolve to a template name. | |||
111 | // 'using typename Dependent::foo;' cannot (not even if 'foo' is an | |||
112 | // injected-class-name). | |||
113 | if (AllowDependent && isa<UnresolvedUsingValueDecl>(D)) | |||
114 | return D; | |||
115 | ||||
116 | return nullptr; | |||
117 | } | |||
118 | ||||
119 | void Sema::FilterAcceptableTemplateNames(LookupResult &R, | |||
120 | bool AllowFunctionTemplates, | |||
121 | bool AllowDependent) { | |||
122 | LookupResult::Filter filter = R.makeFilter(); | |||
123 | while (filter.hasNext()) { | |||
124 | NamedDecl *Orig = filter.next(); | |||
125 | if (!getAsTemplateNameDecl(Orig, AllowFunctionTemplates, AllowDependent)) | |||
126 | filter.erase(); | |||
127 | } | |||
128 | filter.done(); | |||
129 | } | |||
130 | ||||
131 | bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R, | |||
132 | bool AllowFunctionTemplates, | |||
133 | bool AllowDependent, | |||
134 | bool AllowNonTemplateFunctions) { | |||
135 | for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { | |||
136 | if (getAsTemplateNameDecl(*I, AllowFunctionTemplates, AllowDependent)) | |||
137 | return true; | |||
138 | if (AllowNonTemplateFunctions && | |||
139 | isa<FunctionDecl>((*I)->getUnderlyingDecl())) | |||
140 | return true; | |||
141 | } | |||
142 | ||||
143 | return false; | |||
144 | } | |||
145 | ||||
146 | TemplateNameKind Sema::isTemplateName(Scope *S, | |||
147 | CXXScopeSpec &SS, | |||
148 | bool hasTemplateKeyword, | |||
149 | const UnqualifiedId &Name, | |||
150 | ParsedType ObjectTypePtr, | |||
151 | bool EnteringContext, | |||
152 | TemplateTy &TemplateResult, | |||
153 | bool &MemberOfUnknownSpecialization) { | |||
154 | assert(getLangOpts().CPlusPlus && "No template names in C!")((getLangOpts().CPlusPlus && "No template names in C!" ) ? static_cast<void> (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No template names in C!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 154, __PRETTY_FUNCTION__)); | |||
155 | ||||
156 | DeclarationName TName; | |||
157 | MemberOfUnknownSpecialization = false; | |||
158 | ||||
159 | switch (Name.getKind()) { | |||
160 | case UnqualifiedIdKind::IK_Identifier: | |||
161 | TName = DeclarationName(Name.Identifier); | |||
162 | break; | |||
163 | ||||
164 | case UnqualifiedIdKind::IK_OperatorFunctionId: | |||
165 | TName = Context.DeclarationNames.getCXXOperatorName( | |||
166 | Name.OperatorFunctionId.Operator); | |||
167 | break; | |||
168 | ||||
169 | case UnqualifiedIdKind::IK_LiteralOperatorId: | |||
170 | TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier); | |||
171 | break; | |||
172 | ||||
173 | default: | |||
174 | return TNK_Non_template; | |||
175 | } | |||
176 | ||||
177 | QualType ObjectType = ObjectTypePtr.get(); | |||
178 | ||||
179 | AssumedTemplateKind AssumedTemplate; | |||
180 | LookupResult R(*this, TName, Name.getBeginLoc(), LookupOrdinaryName); | |||
181 | if (LookupTemplateName(R, S, SS, ObjectType, EnteringContext, | |||
182 | MemberOfUnknownSpecialization, SourceLocation(), | |||
183 | &AssumedTemplate)) | |||
184 | return TNK_Non_template; | |||
185 | ||||
186 | if (AssumedTemplate != AssumedTemplateKind::None) { | |||
187 | TemplateResult = TemplateTy::make(Context.getAssumedTemplateName(TName)); | |||
188 | // Let the parser know whether we found nothing or found functions; if we | |||
189 | // found nothing, we want to more carefully check whether this is actually | |||
190 | // a function template name versus some other kind of undeclared identifier. | |||
191 | return AssumedTemplate == AssumedTemplateKind::FoundNothing | |||
192 | ? TNK_Undeclared_template | |||
193 | : TNK_Function_template; | |||
194 | } | |||
195 | ||||
196 | if (R.empty()) | |||
197 | return TNK_Non_template; | |||
198 | ||||
199 | NamedDecl *D = nullptr; | |||
200 | if (R.isAmbiguous()) { | |||
201 | // If we got an ambiguity involving a non-function template, treat this | |||
202 | // as a template name, and pick an arbitrary template for error recovery. | |||
203 | bool AnyFunctionTemplates = false; | |||
204 | for (NamedDecl *FoundD : R) { | |||
205 | if (NamedDecl *FoundTemplate = getAsTemplateNameDecl(FoundD)) { | |||
206 | if (isa<FunctionTemplateDecl>(FoundTemplate)) | |||
207 | AnyFunctionTemplates = true; | |||
208 | else { | |||
209 | D = FoundTemplate; | |||
210 | break; | |||
211 | } | |||
212 | } | |||
213 | } | |||
214 | ||||
215 | // If we didn't find any templates at all, this isn't a template name. | |||
216 | // Leave the ambiguity for a later lookup to diagnose. | |||
217 | if (!D && !AnyFunctionTemplates) { | |||
218 | R.suppressDiagnostics(); | |||
219 | return TNK_Non_template; | |||
220 | } | |||
221 | ||||
222 | // If the only templates were function templates, filter out the rest. | |||
223 | // We'll diagnose the ambiguity later. | |||
224 | if (!D) | |||
225 | FilterAcceptableTemplateNames(R); | |||
226 | } | |||
227 | ||||
228 | // At this point, we have either picked a single template name declaration D | |||
229 | // or we have a non-empty set of results R containing either one template name | |||
230 | // declaration or a set of function templates. | |||
231 | ||||
232 | TemplateName Template; | |||
233 | TemplateNameKind TemplateKind; | |||
234 | ||||
235 | unsigned ResultCount = R.end() - R.begin(); | |||
236 | if (!D && ResultCount > 1) { | |||
237 | // We assume that we'll preserve the qualifier from a function | |||
238 | // template name in other ways. | |||
239 | Template = Context.getOverloadedTemplateName(R.begin(), R.end()); | |||
240 | TemplateKind = TNK_Function_template; | |||
241 | ||||
242 | // We'll do this lookup again later. | |||
243 | R.suppressDiagnostics(); | |||
244 | } else { | |||
245 | if (!D) { | |||
246 | D = getAsTemplateNameDecl(*R.begin()); | |||
247 | assert(D && "unambiguous result is not a template name")((D && "unambiguous result is not a template name") ? static_cast<void> (0) : __assert_fail ("D && \"unambiguous result is not a template name\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 247, __PRETTY_FUNCTION__)); | |||
248 | } | |||
249 | ||||
250 | if (isa<UnresolvedUsingValueDecl>(D)) { | |||
251 | // We don't yet know whether this is a template-name or not. | |||
252 | MemberOfUnknownSpecialization = true; | |||
253 | return TNK_Non_template; | |||
254 | } | |||
255 | ||||
256 | TemplateDecl *TD = cast<TemplateDecl>(D); | |||
257 | ||||
258 | if (SS.isSet() && !SS.isInvalid()) { | |||
259 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); | |||
260 | Template = Context.getQualifiedTemplateName(Qualifier, | |||
261 | hasTemplateKeyword, TD); | |||
262 | } else { | |||
263 | Template = TemplateName(TD); | |||
264 | } | |||
265 | ||||
266 | if (isa<FunctionTemplateDecl>(TD)) { | |||
267 | TemplateKind = TNK_Function_template; | |||
268 | ||||
269 | // We'll do this lookup again later. | |||
270 | R.suppressDiagnostics(); | |||
271 | } else { | |||
272 | assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl >(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl >(TD) || isa<BuiltinTemplateDecl>(TD)) ? static_cast <void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 274, __PRETTY_FUNCTION__)) | |||
273 | isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl >(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl >(TD) || isa<BuiltinTemplateDecl>(TD)) ? static_cast <void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 274, __PRETTY_FUNCTION__)) | |||
274 | isa<BuiltinTemplateDecl>(TD))((isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl >(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl >(TD) || isa<BuiltinTemplateDecl>(TD)) ? static_cast <void> (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 274, __PRETTY_FUNCTION__)); | |||
275 | TemplateKind = | |||
276 | isa<VarTemplateDecl>(TD) ? TNK_Var_template : TNK_Type_template; | |||
277 | } | |||
278 | } | |||
279 | ||||
280 | TemplateResult = TemplateTy::make(Template); | |||
281 | return TemplateKind; | |||
282 | } | |||
283 | ||||
284 | bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name, | |||
285 | SourceLocation NameLoc, | |||
286 | ParsedTemplateTy *Template) { | |||
287 | CXXScopeSpec SS; | |||
288 | bool MemberOfUnknownSpecialization = false; | |||
289 | ||||
290 | // We could use redeclaration lookup here, but we don't need to: the | |||
291 | // syntactic form of a deduction guide is enough to identify it even | |||
292 | // if we can't look up the template name at all. | |||
293 | LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName); | |||
294 | if (LookupTemplateName(R, S, SS, /*ObjectType*/ QualType(), | |||
295 | /*EnteringContext*/ false, | |||
296 | MemberOfUnknownSpecialization)) | |||
297 | return false; | |||
298 | ||||
299 | if (R.empty()) return false; | |||
300 | if (R.isAmbiguous()) { | |||
301 | // FIXME: Diagnose an ambiguity if we find at least one template. | |||
302 | R.suppressDiagnostics(); | |||
303 | return false; | |||
304 | } | |||
305 | ||||
306 | // We only treat template-names that name type templates as valid deduction | |||
307 | // guide names. | |||
308 | TemplateDecl *TD = R.getAsSingle<TemplateDecl>(); | |||
309 | if (!TD || !getAsTypeTemplateDecl(TD)) | |||
310 | return false; | |||
311 | ||||
312 | if (Template) | |||
313 | *Template = TemplateTy::make(TemplateName(TD)); | |||
314 | return true; | |||
315 | } | |||
316 | ||||
317 | bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II, | |||
318 | SourceLocation IILoc, | |||
319 | Scope *S, | |||
320 | const CXXScopeSpec *SS, | |||
321 | TemplateTy &SuggestedTemplate, | |||
322 | TemplateNameKind &SuggestedKind) { | |||
323 | // We can't recover unless there's a dependent scope specifier preceding the | |||
324 | // template name. | |||
325 | // FIXME: Typo correction? | |||
326 | if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) || | |||
327 | computeDeclContext(*SS)) | |||
328 | return false; | |||
329 | ||||
330 | // The code is missing a 'template' keyword prior to the dependent template | |||
331 | // name. | |||
332 | NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep(); | |||
333 | Diag(IILoc, diag::err_template_kw_missing) | |||
334 | << Qualifier << II.getName() | |||
335 | << FixItHint::CreateInsertion(IILoc, "template "); | |||
336 | SuggestedTemplate | |||
337 | = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II)); | |||
338 | SuggestedKind = TNK_Dependent_template_name; | |||
339 | return true; | |||
340 | } | |||
341 | ||||
342 | bool Sema::LookupTemplateName(LookupResult &Found, | |||
343 | Scope *S, CXXScopeSpec &SS, | |||
344 | QualType ObjectType, | |||
345 | bool EnteringContext, | |||
346 | bool &MemberOfUnknownSpecialization, | |||
347 | SourceLocation TemplateKWLoc, | |||
348 | AssumedTemplateKind *ATK) { | |||
349 | if (ATK) | |||
350 | *ATK = AssumedTemplateKind::None; | |||
351 | ||||
352 | Found.setTemplateNameLookup(true); | |||
353 | ||||
354 | // Determine where to perform name lookup | |||
355 | MemberOfUnknownSpecialization = false; | |||
356 | DeclContext *LookupCtx = nullptr; | |||
357 | bool IsDependent = false; | |||
358 | if (!ObjectType.isNull()) { | |||
359 | // This nested-name-specifier occurs in a member access expression, e.g., | |||
360 | // x->B::f, and we are looking into the type of the object. | |||
361 | assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist")((!SS.isSet() && "ObjectType and scope specifier cannot coexist" ) ? static_cast<void> (0) : __assert_fail ("!SS.isSet() && \"ObjectType and scope specifier cannot coexist\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 361, __PRETTY_FUNCTION__)); | |||
362 | LookupCtx = computeDeclContext(ObjectType); | |||
363 | IsDependent = !LookupCtx; | |||
364 | assert((IsDependent || !ObjectType->isIncompleteType() ||(((IsDependent || !ObjectType->isIncompleteType() || ObjectType ->castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type") ? static_cast< void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 366, __PRETTY_FUNCTION__)) | |||
365 | ObjectType->castAs<TagType>()->isBeingDefined()) &&(((IsDependent || !ObjectType->isIncompleteType() || ObjectType ->castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type") ? static_cast< void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 366, __PRETTY_FUNCTION__)) | |||
366 | "Caller should have completed object type")(((IsDependent || !ObjectType->isIncompleteType() || ObjectType ->castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type") ? static_cast< void> (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 366, __PRETTY_FUNCTION__)); | |||
367 | ||||
368 | // Template names cannot appear inside an Objective-C class or object type. | |||
369 | if (ObjectType->isObjCObjectOrInterfaceType()) { | |||
370 | Found.clear(); | |||
371 | return false; | |||
372 | } | |||
373 | } else if (SS.isSet()) { | |||
374 | // This nested-name-specifier occurs after another nested-name-specifier, | |||
375 | // so long into the context associated with the prior nested-name-specifier. | |||
376 | LookupCtx = computeDeclContext(SS, EnteringContext); | |||
377 | IsDependent = !LookupCtx; | |||
378 | ||||
379 | // The declaration context must be complete. | |||
380 | if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx)) | |||
381 | return true; | |||
382 | } | |||
383 | ||||
384 | bool ObjectTypeSearchedInScope = false; | |||
385 | bool AllowFunctionTemplatesInLookup = true; | |||
386 | if (LookupCtx) { | |||
387 | // Perform "qualified" name lookup into the declaration context we | |||
388 | // computed, which is either the type of the base of a member access | |||
389 | // expression or the declaration context associated with a prior | |||
390 | // nested-name-specifier. | |||
391 | LookupQualifiedName(Found, LookupCtx); | |||
392 | ||||
393 | // FIXME: The C++ standard does not clearly specify what happens in the | |||
394 | // case where the object type is dependent, and implementations vary. In | |||
395 | // Clang, we treat a name after a . or -> as a template-name if lookup | |||
396 | // finds a non-dependent member or member of the current instantiation that | |||
397 | // is a type template, or finds no such members and lookup in the context | |||
398 | // of the postfix-expression finds a type template. In the latter case, the | |||
399 | // name is nonetheless dependent, and we may resolve it to a member of an | |||
400 | // unknown specialization when we come to instantiate the template. | |||
401 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); | |||
402 | } | |||
403 | ||||
404 | if (!SS.isSet() && (ObjectType.isNull() || Found.empty())) { | |||
405 | // C++ [basic.lookup.classref]p1: | |||
406 | // In a class member access expression (5.2.5), if the . or -> token is | |||
407 | // immediately followed by an identifier followed by a <, the | |||
408 | // identifier must be looked up to determine whether the < is the | |||
409 | // beginning of a template argument list (14.2) or a less-than operator. | |||
410 | // The identifier is first looked up in the class of the object | |||
411 | // expression. If the identifier is not found, it is then looked up in | |||
412 | // the context of the entire postfix-expression and shall name a class | |||
413 | // template. | |||
414 | if (S) | |||
415 | LookupName(Found, S); | |||
416 | ||||
417 | if (!ObjectType.isNull()) { | |||
418 | // FIXME: We should filter out all non-type templates here, particularly | |||
419 | // variable templates and concepts. But the exclusion of alias templates | |||
420 | // and template template parameters is a wording defect. | |||
421 | AllowFunctionTemplatesInLookup = false; | |||
422 | ObjectTypeSearchedInScope = true; | |||
423 | } | |||
424 | ||||
425 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); | |||
426 | } | |||
427 | ||||
428 | if (Found.isAmbiguous()) | |||
429 | return false; | |||
430 | ||||
431 | if (ATK && !SS.isSet() && ObjectType.isNull() && TemplateKWLoc.isInvalid()) { | |||
432 | // C++2a [temp.names]p2: | |||
433 | // A name is also considered to refer to a template if it is an | |||
434 | // unqualified-id followed by a < and name lookup finds either one or more | |||
435 | // functions or finds nothing. | |||
436 | // | |||
437 | // To keep our behavior consistent, we apply the "finds nothing" part in | |||
438 | // all language modes, and diagnose the empty lookup in ActOnCallExpr if we | |||
439 | // successfully form a call to an undeclared template-id. | |||
440 | bool AllFunctions = | |||
441 | getLangOpts().CPlusPlus2a && | |||
442 | std::all_of(Found.begin(), Found.end(), [](NamedDecl *ND) { | |||
443 | return isa<FunctionDecl>(ND->getUnderlyingDecl()); | |||
444 | }); | |||
445 | if (AllFunctions || (Found.empty() && !IsDependent)) { | |||
446 | // If lookup found any functions, or if this is a name that can only be | |||
447 | // used for a function, then strongly assume this is a function | |||
448 | // template-id. | |||
449 | *ATK = (Found.empty() && Found.getLookupName().isIdentifier()) | |||
450 | ? AssumedTemplateKind::FoundNothing | |||
451 | : AssumedTemplateKind::FoundFunctions; | |||
452 | Found.clear(); | |||
453 | return false; | |||
454 | } | |||
455 | } | |||
456 | ||||
457 | if (Found.empty() && !IsDependent) { | |||
458 | // If we did not find any names, attempt to correct any typos. | |||
459 | DeclarationName Name = Found.getLookupName(); | |||
460 | Found.clear(); | |||
461 | // Simple filter callback that, for keywords, only accepts the C++ *_cast | |||
462 | DefaultFilterCCC FilterCCC{}; | |||
463 | FilterCCC.WantTypeSpecifiers = false; | |||
464 | FilterCCC.WantExpressionKeywords = false; | |||
465 | FilterCCC.WantRemainingKeywords = false; | |||
466 | FilterCCC.WantCXXNamedCasts = true; | |||
467 | if (TypoCorrection Corrected = | |||
468 | CorrectTypo(Found.getLookupNameInfo(), Found.getLookupKind(), S, | |||
469 | &SS, FilterCCC, CTK_ErrorRecovery, LookupCtx)) { | |||
470 | if (auto *ND = Corrected.getFoundDecl()) | |||
471 | Found.addDecl(ND); | |||
472 | FilterAcceptableTemplateNames(Found); | |||
473 | if (Found.isAmbiguous()) { | |||
474 | Found.clear(); | |||
475 | } else if (!Found.empty()) { | |||
476 | Found.setLookupName(Corrected.getCorrection()); | |||
477 | if (LookupCtx) { | |||
478 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); | |||
479 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && | |||
480 | Name.getAsString() == CorrectedStr; | |||
481 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest) | |||
482 | << Name << LookupCtx << DroppedSpecifier | |||
483 | << SS.getRange()); | |||
484 | } else { | |||
485 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name); | |||
486 | } | |||
487 | } | |||
488 | } | |||
489 | } | |||
490 | ||||
491 | NamedDecl *ExampleLookupResult = | |||
492 | Found.empty() ? nullptr : Found.getRepresentativeDecl(); | |||
493 | FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup); | |||
494 | if (Found.empty()) { | |||
495 | if (IsDependent) { | |||
496 | MemberOfUnknownSpecialization = true; | |||
497 | return false; | |||
498 | } | |||
499 | ||||
500 | // If a 'template' keyword was used, a lookup that finds only non-template | |||
501 | // names is an error. | |||
502 | if (ExampleLookupResult && TemplateKWLoc.isValid()) { | |||
503 | Diag(Found.getNameLoc(), diag::err_template_kw_refers_to_non_template) | |||
504 | << Found.getLookupName() << SS.getRange(); | |||
505 | Diag(ExampleLookupResult->getUnderlyingDecl()->getLocation(), | |||
506 | diag::note_template_kw_refers_to_non_template) | |||
507 | << Found.getLookupName(); | |||
508 | return true; | |||
509 | } | |||
510 | ||||
511 | return false; | |||
512 | } | |||
513 | ||||
514 | if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope && | |||
515 | !getLangOpts().CPlusPlus11) { | |||
516 | // C++03 [basic.lookup.classref]p1: | |||
517 | // [...] If the lookup in the class of the object expression finds a | |||
518 | // template, the name is also looked up in the context of the entire | |||
519 | // postfix-expression and [...] | |||
520 | // | |||
521 | // Note: C++11 does not perform this second lookup. | |||
522 | LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(), | |||
523 | LookupOrdinaryName); | |||
524 | FoundOuter.setTemplateNameLookup(true); | |||
525 | LookupName(FoundOuter, S); | |||
526 | // FIXME: We silently accept an ambiguous lookup here, in violation of | |||
527 | // [basic.lookup]/1. | |||
528 | FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false); | |||
529 | ||||
530 | NamedDecl *OuterTemplate; | |||
531 | if (FoundOuter.empty()) { | |||
532 | // - if the name is not found, the name found in the class of the | |||
533 | // object expression is used, otherwise | |||
534 | } else if (FoundOuter.isAmbiguous() || !FoundOuter.isSingleResult() || | |||
535 | !(OuterTemplate = | |||
536 | getAsTemplateNameDecl(FoundOuter.getFoundDecl()))) { | |||
537 | // - if the name is found in the context of the entire | |||
538 | // postfix-expression and does not name a class template, the name | |||
539 | // found in the class of the object expression is used, otherwise | |||
540 | FoundOuter.clear(); | |||
541 | } else if (!Found.isSuppressingDiagnostics()) { | |||
542 | // - if the name found is a class template, it must refer to the same | |||
543 | // entity as the one found in the class of the object expression, | |||
544 | // otherwise the program is ill-formed. | |||
545 | if (!Found.isSingleResult() || | |||
546 | getAsTemplateNameDecl(Found.getFoundDecl())->getCanonicalDecl() != | |||
547 | OuterTemplate->getCanonicalDecl()) { | |||
548 | Diag(Found.getNameLoc(), | |||
549 | diag::ext_nested_name_member_ref_lookup_ambiguous) | |||
550 | << Found.getLookupName() | |||
551 | << ObjectType; | |||
552 | Diag(Found.getRepresentativeDecl()->getLocation(), | |||
553 | diag::note_ambig_member_ref_object_type) | |||
554 | << ObjectType; | |||
555 | Diag(FoundOuter.getFoundDecl()->getLocation(), | |||
556 | diag::note_ambig_member_ref_scope); | |||
557 | ||||
558 | // Recover by taking the template that we found in the object | |||
559 | // expression's type. | |||
560 | } | |||
561 | } | |||
562 | } | |||
563 | ||||
564 | return false; | |||
565 | } | |||
566 | ||||
567 | void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName, | |||
568 | SourceLocation Less, | |||
569 | SourceLocation Greater) { | |||
570 | if (TemplateName.isInvalid()) | |||
571 | return; | |||
572 | ||||
573 | DeclarationNameInfo NameInfo; | |||
574 | CXXScopeSpec SS; | |||
575 | LookupNameKind LookupKind; | |||
576 | ||||
577 | DeclContext *LookupCtx = nullptr; | |||
578 | NamedDecl *Found = nullptr; | |||
579 | bool MissingTemplateKeyword = false; | |||
580 | ||||
581 | // Figure out what name we looked up. | |||
582 | if (auto *DRE = dyn_cast<DeclRefExpr>(TemplateName.get())) { | |||
583 | NameInfo = DRE->getNameInfo(); | |||
584 | SS.Adopt(DRE->getQualifierLoc()); | |||
585 | LookupKind = LookupOrdinaryName; | |||
586 | Found = DRE->getFoundDecl(); | |||
587 | } else if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) { | |||
588 | NameInfo = ME->getMemberNameInfo(); | |||
589 | SS.Adopt(ME->getQualifierLoc()); | |||
590 | LookupKind = LookupMemberName; | |||
591 | LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl(); | |||
592 | Found = ME->getMemberDecl(); | |||
593 | } else if (auto *DSDRE = | |||
594 | dyn_cast<DependentScopeDeclRefExpr>(TemplateName.get())) { | |||
595 | NameInfo = DSDRE->getNameInfo(); | |||
596 | SS.Adopt(DSDRE->getQualifierLoc()); | |||
597 | MissingTemplateKeyword = true; | |||
598 | } else if (auto *DSME = | |||
599 | dyn_cast<CXXDependentScopeMemberExpr>(TemplateName.get())) { | |||
600 | NameInfo = DSME->getMemberNameInfo(); | |||
601 | SS.Adopt(DSME->getQualifierLoc()); | |||
602 | MissingTemplateKeyword = true; | |||
603 | } else { | |||
604 | llvm_unreachable("unexpected kind of potential template name")::llvm::llvm_unreachable_internal("unexpected kind of potential template name" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 604); | |||
605 | } | |||
606 | ||||
607 | // If this is a dependent-scope lookup, diagnose that the 'template' keyword | |||
608 | // was missing. | |||
609 | if (MissingTemplateKeyword) { | |||
610 | Diag(NameInfo.getBeginLoc(), diag::err_template_kw_missing) | |||
611 | << "" << NameInfo.getName().getAsString() << SourceRange(Less, Greater); | |||
612 | return; | |||
613 | } | |||
614 | ||||
615 | // Try to correct the name by looking for templates and C++ named casts. | |||
616 | struct TemplateCandidateFilter : CorrectionCandidateCallback { | |||
617 | Sema &S; | |||
618 | TemplateCandidateFilter(Sema &S) : S(S) { | |||
619 | WantTypeSpecifiers = false; | |||
620 | WantExpressionKeywords = false; | |||
621 | WantRemainingKeywords = false; | |||
622 | WantCXXNamedCasts = true; | |||
623 | }; | |||
624 | bool ValidateCandidate(const TypoCorrection &Candidate) override { | |||
625 | if (auto *ND = Candidate.getCorrectionDecl()) | |||
626 | return S.getAsTemplateNameDecl(ND); | |||
627 | return Candidate.isKeyword(); | |||
628 | } | |||
629 | ||||
630 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
631 | return llvm::make_unique<TemplateCandidateFilter>(*this); | |||
632 | } | |||
633 | }; | |||
634 | ||||
635 | DeclarationName Name = NameInfo.getName(); | |||
636 | TemplateCandidateFilter CCC(*this); | |||
637 | if (TypoCorrection Corrected = CorrectTypo(NameInfo, LookupKind, S, &SS, CCC, | |||
638 | CTK_ErrorRecovery, LookupCtx)) { | |||
639 | auto *ND = Corrected.getFoundDecl(); | |||
640 | if (ND) | |||
641 | ND = getAsTemplateNameDecl(ND); | |||
642 | if (ND || Corrected.isKeyword()) { | |||
643 | if (LookupCtx) { | |||
644 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); | |||
645 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && | |||
646 | Name.getAsString() == CorrectedStr; | |||
647 | diagnoseTypo(Corrected, | |||
648 | PDiag(diag::err_non_template_in_member_template_id_suggest) | |||
649 | << Name << LookupCtx << DroppedSpecifier | |||
650 | << SS.getRange(), false); | |||
651 | } else { | |||
652 | diagnoseTypo(Corrected, | |||
653 | PDiag(diag::err_non_template_in_template_id_suggest) | |||
654 | << Name, false); | |||
655 | } | |||
656 | if (Found) | |||
657 | Diag(Found->getLocation(), | |||
658 | diag::note_non_template_in_template_id_found); | |||
659 | return; | |||
660 | } | |||
661 | } | |||
662 | ||||
663 | Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id) | |||
664 | << Name << SourceRange(Less, Greater); | |||
665 | if (Found) | |||
666 | Diag(Found->getLocation(), diag::note_non_template_in_template_id_found); | |||
667 | } | |||
668 | ||||
669 | /// ActOnDependentIdExpression - Handle a dependent id-expression that | |||
670 | /// was just parsed. This is only possible with an explicit scope | |||
671 | /// specifier naming a dependent type. | |||
672 | ExprResult | |||
673 | Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS, | |||
674 | SourceLocation TemplateKWLoc, | |||
675 | const DeclarationNameInfo &NameInfo, | |||
676 | bool isAddressOfOperand, | |||
677 | const TemplateArgumentListInfo *TemplateArgs) { | |||
678 | DeclContext *DC = getFunctionLevelDeclContext(); | |||
679 | ||||
680 | // C++11 [expr.prim.general]p12: | |||
681 | // An id-expression that denotes a non-static data member or non-static | |||
682 | // member function of a class can only be used: | |||
683 | // (...) | |||
684 | // - if that id-expression denotes a non-static data member and it | |||
685 | // appears in an unevaluated operand. | |||
686 | // | |||
687 | // If this might be the case, form a DependentScopeDeclRefExpr instead of a | |||
688 | // CXXDependentScopeMemberExpr. The former can instantiate to either | |||
689 | // DeclRefExpr or MemberExpr depending on lookup results, while the latter is | |||
690 | // always a MemberExpr. | |||
691 | bool MightBeCxx11UnevalField = | |||
692 | getLangOpts().CPlusPlus11 && isUnevaluatedContext(); | |||
693 | ||||
694 | // Check if the nested name specifier is an enum type. | |||
695 | bool IsEnum = false; | |||
696 | if (NestedNameSpecifier *NNS = SS.getScopeRep()) | |||
697 | IsEnum = dyn_cast_or_null<EnumType>(NNS->getAsType()); | |||
698 | ||||
699 | if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum && | |||
700 | isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) { | |||
701 | QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(); | |||
702 | ||||
703 | // Since the 'this' expression is synthesized, we don't need to | |||
704 | // perform the double-lookup check. | |||
705 | NamedDecl *FirstQualifierInScope = nullptr; | |||
706 | ||||
707 | return CXXDependentScopeMemberExpr::Create( | |||
708 | Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true, | |||
709 | /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc, | |||
710 | FirstQualifierInScope, NameInfo, TemplateArgs); | |||
711 | } | |||
712 | ||||
713 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); | |||
714 | } | |||
715 | ||||
716 | ExprResult | |||
717 | Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS, | |||
718 | SourceLocation TemplateKWLoc, | |||
719 | const DeclarationNameInfo &NameInfo, | |||
720 | const TemplateArgumentListInfo *TemplateArgs) { | |||
721 | return DependentScopeDeclRefExpr::Create( | |||
722 | Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo, | |||
723 | TemplateArgs); | |||
724 | } | |||
725 | ||||
726 | ||||
727 | /// Determine whether we would be unable to instantiate this template (because | |||
728 | /// it either has no definition, or is in the process of being instantiated). | |||
729 | bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation, | |||
730 | NamedDecl *Instantiation, | |||
731 | bool InstantiatedFromMember, | |||
732 | const NamedDecl *Pattern, | |||
733 | const NamedDecl *PatternDef, | |||
734 | TemplateSpecializationKind TSK, | |||
735 | bool Complain /*= true*/) { | |||
736 | assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||((isa<TagDecl>(Instantiation) || isa<FunctionDecl> (Instantiation) || isa<VarDecl>(Instantiation)) ? static_cast <void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 737, __PRETTY_FUNCTION__)) | |||
737 | isa<VarDecl>(Instantiation))((isa<TagDecl>(Instantiation) || isa<FunctionDecl> (Instantiation) || isa<VarDecl>(Instantiation)) ? static_cast <void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 737, __PRETTY_FUNCTION__)); | |||
738 | ||||
739 | bool IsEntityBeingDefined = false; | |||
740 | if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef)) | |||
741 | IsEntityBeingDefined = TD->isBeingDefined(); | |||
742 | ||||
743 | if (PatternDef && !IsEntityBeingDefined) { | |||
744 | NamedDecl *SuggestedDef = nullptr; | |||
745 | if (!hasVisibleDefinition(const_cast<NamedDecl*>(PatternDef), &SuggestedDef, | |||
746 | /*OnlyNeedComplete*/false)) { | |||
747 | // If we're allowed to diagnose this and recover, do so. | |||
748 | bool Recover = Complain && !isSFINAEContext(); | |||
749 | if (Complain) | |||
750 | diagnoseMissingImport(PointOfInstantiation, SuggestedDef, | |||
751 | Sema::MissingImportKind::Definition, Recover); | |||
752 | return !Recover; | |||
753 | } | |||
754 | return false; | |||
755 | } | |||
756 | ||||
757 | if (!Complain || (PatternDef && PatternDef->isInvalidDecl())) | |||
758 | return true; | |||
759 | ||||
760 | llvm::Optional<unsigned> Note; | |||
761 | QualType InstantiationTy; | |||
762 | if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation)) | |||
763 | InstantiationTy = Context.getTypeDeclType(TD); | |||
764 | if (PatternDef) { | |||
765 | Diag(PointOfInstantiation, | |||
766 | diag::err_template_instantiate_within_definition) | |||
767 | << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation) | |||
768 | << InstantiationTy; | |||
769 | // Not much point in noting the template declaration here, since | |||
770 | // we're lexically inside it. | |||
771 | Instantiation->setInvalidDecl(); | |||
772 | } else if (InstantiatedFromMember) { | |||
773 | if (isa<FunctionDecl>(Instantiation)) { | |||
774 | Diag(PointOfInstantiation, | |||
775 | diag::err_explicit_instantiation_undefined_member) | |||
776 | << /*member function*/ 1 << Instantiation->getDeclName() | |||
777 | << Instantiation->getDeclContext(); | |||
778 | Note = diag::note_explicit_instantiation_here; | |||
779 | } else { | |||
780 | assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!")((isa<TagDecl>(Instantiation) && "Must be a TagDecl!" ) ? static_cast<void> (0) : __assert_fail ("isa<TagDecl>(Instantiation) && \"Must be a TagDecl!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 780, __PRETTY_FUNCTION__)); | |||
781 | Diag(PointOfInstantiation, | |||
782 | diag::err_implicit_instantiate_member_undefined) | |||
783 | << InstantiationTy; | |||
784 | Note = diag::note_member_declared_at; | |||
785 | } | |||
786 | } else { | |||
787 | if (isa<FunctionDecl>(Instantiation)) { | |||
788 | Diag(PointOfInstantiation, | |||
789 | diag::err_explicit_instantiation_undefined_func_template) | |||
790 | << Pattern; | |||
791 | Note = diag::note_explicit_instantiation_here; | |||
792 | } else if (isa<TagDecl>(Instantiation)) { | |||
793 | Diag(PointOfInstantiation, diag::err_template_instantiate_undefined) | |||
794 | << (TSK != TSK_ImplicitInstantiation) | |||
795 | << InstantiationTy; | |||
796 | Note = diag::note_template_decl_here; | |||
797 | } else { | |||
798 | assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!")((isa<VarDecl>(Instantiation) && "Must be a VarDecl!" ) ? static_cast<void> (0) : __assert_fail ("isa<VarDecl>(Instantiation) && \"Must be a VarDecl!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 798, __PRETTY_FUNCTION__)); | |||
799 | if (isa<VarTemplateSpecializationDecl>(Instantiation)) { | |||
800 | Diag(PointOfInstantiation, | |||
801 | diag::err_explicit_instantiation_undefined_var_template) | |||
802 | << Instantiation; | |||
803 | Instantiation->setInvalidDecl(); | |||
804 | } else | |||
805 | Diag(PointOfInstantiation, | |||
806 | diag::err_explicit_instantiation_undefined_member) | |||
807 | << /*static data member*/ 2 << Instantiation->getDeclName() | |||
808 | << Instantiation->getDeclContext(); | |||
809 | Note = diag::note_explicit_instantiation_here; | |||
810 | } | |||
811 | } | |||
812 | if (Note) // Diagnostics were emitted. | |||
813 | Diag(Pattern->getLocation(), Note.getValue()); | |||
814 | ||||
815 | // In general, Instantiation isn't marked invalid to get more than one | |||
816 | // error for multiple undefined instantiations. But the code that does | |||
817 | // explicit declaration -> explicit definition conversion can't handle | |||
818 | // invalid declarations, so mark as invalid in that case. | |||
819 | if (TSK == TSK_ExplicitInstantiationDeclaration) | |||
820 | Instantiation->setInvalidDecl(); | |||
821 | return true; | |||
822 | } | |||
823 | ||||
824 | /// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining | |||
825 | /// that the template parameter 'PrevDecl' is being shadowed by a new | |||
826 | /// declaration at location Loc. Returns true to indicate that this is | |||
827 | /// an error, and false otherwise. | |||
828 | void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) { | |||
829 | assert(PrevDecl->isTemplateParameter() && "Not a template parameter")((PrevDecl->isTemplateParameter() && "Not a template parameter" ) ? static_cast<void> (0) : __assert_fail ("PrevDecl->isTemplateParameter() && \"Not a template parameter\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 829, __PRETTY_FUNCTION__)); | |||
830 | ||||
831 | // Microsoft Visual C++ permits template parameters to be shadowed. | |||
832 | if (getLangOpts().MicrosoftExt) | |||
833 | return; | |||
834 | ||||
835 | // C++ [temp.local]p4: | |||
836 | // A template-parameter shall not be redeclared within its | |||
837 | // scope (including nested scopes). | |||
838 | Diag(Loc, diag::err_template_param_shadow) | |||
839 | << cast<NamedDecl>(PrevDecl)->getDeclName(); | |||
840 | Diag(PrevDecl->getLocation(), diag::note_template_param_here); | |||
841 | } | |||
842 | ||||
843 | /// AdjustDeclIfTemplate - If the given decl happens to be a template, reset | |||
844 | /// the parameter D to reference the templated declaration and return a pointer | |||
845 | /// to the template declaration. Otherwise, do nothing to D and return null. | |||
846 | TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) { | |||
847 | if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) { | |||
848 | D = Temp->getTemplatedDecl(); | |||
849 | return Temp; | |||
850 | } | |||
851 | return nullptr; | |||
852 | } | |||
853 | ||||
854 | ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion( | |||
855 | SourceLocation EllipsisLoc) const { | |||
856 | assert(Kind == Template &&((Kind == Template && "Only template template arguments can be pack expansions here" ) ? static_cast<void> (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 857, __PRETTY_FUNCTION__)) | |||
857 | "Only template template arguments can be pack expansions here")((Kind == Template && "Only template template arguments can be pack expansions here" ) ? static_cast<void> (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 857, __PRETTY_FUNCTION__)); | |||
858 | assert(getAsTemplate().get().containsUnexpandedParameterPack() &&((getAsTemplate().get().containsUnexpandedParameterPack() && "Template template argument pack expansion without packs") ? static_cast<void> (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 859, __PRETTY_FUNCTION__)) | |||
859 | "Template template argument pack expansion without packs")((getAsTemplate().get().containsUnexpandedParameterPack() && "Template template argument pack expansion without packs") ? static_cast<void> (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 859, __PRETTY_FUNCTION__)); | |||
860 | ParsedTemplateArgument Result(*this); | |||
861 | Result.EllipsisLoc = EllipsisLoc; | |||
862 | return Result; | |||
863 | } | |||
864 | ||||
865 | static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef, | |||
866 | const ParsedTemplateArgument &Arg) { | |||
867 | ||||
868 | switch (Arg.getKind()) { | |||
869 | case ParsedTemplateArgument::Type: { | |||
870 | TypeSourceInfo *DI; | |||
871 | QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI); | |||
872 | if (!DI) | |||
873 | DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation()); | |||
874 | return TemplateArgumentLoc(TemplateArgument(T), DI); | |||
875 | } | |||
876 | ||||
877 | case ParsedTemplateArgument::NonType: { | |||
878 | Expr *E = static_cast<Expr *>(Arg.getAsExpr()); | |||
879 | return TemplateArgumentLoc(TemplateArgument(E), E); | |||
880 | } | |||
881 | ||||
882 | case ParsedTemplateArgument::Template: { | |||
883 | TemplateName Template = Arg.getAsTemplate().get(); | |||
884 | TemplateArgument TArg; | |||
885 | if (Arg.getEllipsisLoc().isValid()) | |||
886 | TArg = TemplateArgument(Template, Optional<unsigned int>()); | |||
887 | else | |||
888 | TArg = Template; | |||
889 | return TemplateArgumentLoc(TArg, | |||
890 | Arg.getScopeSpec().getWithLocInContext( | |||
891 | SemaRef.Context), | |||
892 | Arg.getLocation(), | |||
893 | Arg.getEllipsisLoc()); | |||
894 | } | |||
895 | } | |||
896 | ||||
897 | llvm_unreachable("Unhandled parsed template argument")::llvm::llvm_unreachable_internal("Unhandled parsed template argument" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 897); | |||
898 | } | |||
899 | ||||
900 | /// Translates template arguments as provided by the parser | |||
901 | /// into template arguments used by semantic analysis. | |||
902 | void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn, | |||
903 | TemplateArgumentListInfo &TemplateArgs) { | |||
904 | for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I) | |||
905 | TemplateArgs.addArgument(translateTemplateArgument(*this, | |||
906 | TemplateArgsIn[I])); | |||
907 | } | |||
908 | ||||
909 | static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S, | |||
910 | SourceLocation Loc, | |||
911 | IdentifierInfo *Name) { | |||
912 | NamedDecl *PrevDecl = SemaRef.LookupSingleName( | |||
913 | S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration); | |||
914 | if (PrevDecl && PrevDecl->isTemplateParameter()) | |||
915 | SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl); | |||
916 | } | |||
917 | ||||
918 | /// Convert a parsed type into a parsed template argument. This is mostly | |||
919 | /// trivial, except that we may have parsed a C++17 deduced class template | |||
920 | /// specialization type, in which case we should form a template template | |||
921 | /// argument instead of a type template argument. | |||
922 | ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) { | |||
923 | TypeSourceInfo *TInfo; | |||
924 | QualType T = GetTypeFromParser(ParsedType.get(), &TInfo); | |||
925 | if (T.isNull()) | |||
926 | return ParsedTemplateArgument(); | |||
927 | assert(TInfo && "template argument with no location")((TInfo && "template argument with no location") ? static_cast <void> (0) : __assert_fail ("TInfo && \"template argument with no location\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 927, __PRETTY_FUNCTION__)); | |||
928 | ||||
929 | // If we might have formed a deduced template specialization type, convert | |||
930 | // it to a template template argument. | |||
931 | if (getLangOpts().CPlusPlus17) { | |||
932 | TypeLoc TL = TInfo->getTypeLoc(); | |||
933 | SourceLocation EllipsisLoc; | |||
934 | if (auto PET = TL.getAs<PackExpansionTypeLoc>()) { | |||
935 | EllipsisLoc = PET.getEllipsisLoc(); | |||
936 | TL = PET.getPatternLoc(); | |||
937 | } | |||
938 | ||||
939 | CXXScopeSpec SS; | |||
940 | if (auto ET = TL.getAs<ElaboratedTypeLoc>()) { | |||
941 | SS.Adopt(ET.getQualifierLoc()); | |||
942 | TL = ET.getNamedTypeLoc(); | |||
943 | } | |||
944 | ||||
945 | if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) { | |||
946 | TemplateName Name = DTST.getTypePtr()->getTemplateName(); | |||
947 | if (SS.isSet()) | |||
948 | Name = Context.getQualifiedTemplateName(SS.getScopeRep(), | |||
949 | /*HasTemplateKeyword*/ false, | |||
950 | Name.getAsTemplateDecl()); | |||
951 | ParsedTemplateArgument Result(SS, TemplateTy::make(Name), | |||
952 | DTST.getTemplateNameLoc()); | |||
953 | if (EllipsisLoc.isValid()) | |||
954 | Result = Result.getTemplatePackExpansion(EllipsisLoc); | |||
955 | return Result; | |||
956 | } | |||
957 | } | |||
958 | ||||
959 | // This is a normal type template argument. Note, if the type template | |||
960 | // argument is an injected-class-name for a template, it has a dual nature | |||
961 | // and can be used as either a type or a template. We handle that in | |||
962 | // convertTypeTemplateArgumentToTemplate. | |||
963 | return ParsedTemplateArgument(ParsedTemplateArgument::Type, | |||
964 | ParsedType.get().getAsOpaquePtr(), | |||
965 | TInfo->getTypeLoc().getBeginLoc()); | |||
966 | } | |||
967 | ||||
968 | /// ActOnTypeParameter - Called when a C++ template type parameter | |||
969 | /// (e.g., "typename T") has been parsed. Typename specifies whether | |||
970 | /// the keyword "typename" was used to declare the type parameter | |||
971 | /// (otherwise, "class" was used), and KeyLoc is the location of the | |||
972 | /// "class" or "typename" keyword. ParamName is the name of the | |||
973 | /// parameter (NULL indicates an unnamed template parameter) and | |||
974 | /// ParamNameLoc is the location of the parameter name (if any). | |||
975 | /// If the type parameter has a default argument, it will be added | |||
976 | /// later via ActOnTypeParameterDefault. | |||
977 | NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename, | |||
978 | SourceLocation EllipsisLoc, | |||
979 | SourceLocation KeyLoc, | |||
980 | IdentifierInfo *ParamName, | |||
981 | SourceLocation ParamNameLoc, | |||
982 | unsigned Depth, unsigned Position, | |||
983 | SourceLocation EqualLoc, | |||
984 | ParsedType DefaultArg) { | |||
985 | assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Template type parameter not in template parameter scope!" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 986, __PRETTY_FUNCTION__)) | |||
986 | "Template type parameter not in template parameter scope!")((S->isTemplateParamScope() && "Template type parameter not in template parameter scope!" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 986, __PRETTY_FUNCTION__)); | |||
987 | ||||
988 | SourceLocation Loc = ParamNameLoc; | |||
989 | if (!ParamName) | |||
990 | Loc = KeyLoc; | |||
991 | ||||
992 | bool IsParameterPack = EllipsisLoc.isValid(); | |||
993 | TemplateTypeParmDecl *Param | |||
994 | = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(), | |||
995 | KeyLoc, Loc, Depth, Position, ParamName, | |||
996 | Typename, IsParameterPack); | |||
997 | Param->setAccess(AS_public); | |||
998 | ||||
999 | if (ParamName) { | |||
1000 | maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName); | |||
1001 | ||||
1002 | // Add the template parameter into the current scope. | |||
1003 | S->AddDecl(Param); | |||
1004 | IdResolver.AddDecl(Param); | |||
1005 | } | |||
1006 | ||||
1007 | // C++0x [temp.param]p9: | |||
1008 | // A default template-argument may be specified for any kind of | |||
1009 | // template-parameter that is not a template parameter pack. | |||
1010 | if (DefaultArg && IsParameterPack) { | |||
1011 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); | |||
1012 | DefaultArg = nullptr; | |||
1013 | } | |||
1014 | ||||
1015 | // Handle the default argument, if provided. | |||
1016 | if (DefaultArg) { | |||
1017 | TypeSourceInfo *DefaultTInfo; | |||
1018 | GetTypeFromParser(DefaultArg, &DefaultTInfo); | |||
1019 | ||||
1020 | assert(DefaultTInfo && "expected source information for type")((DefaultTInfo && "expected source information for type" ) ? static_cast<void> (0) : __assert_fail ("DefaultTInfo && \"expected source information for type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1020, __PRETTY_FUNCTION__)); | |||
1021 | ||||
1022 | // Check for unexpanded parameter packs. | |||
1023 | if (DiagnoseUnexpandedParameterPack(Loc, DefaultTInfo, | |||
1024 | UPPC_DefaultArgument)) | |||
1025 | return Param; | |||
1026 | ||||
1027 | // Check the template argument itself. | |||
1028 | if (CheckTemplateArgument(Param, DefaultTInfo)) { | |||
1029 | Param->setInvalidDecl(); | |||
1030 | return Param; | |||
1031 | } | |||
1032 | ||||
1033 | Param->setDefaultArgument(DefaultTInfo); | |||
1034 | } | |||
1035 | ||||
1036 | return Param; | |||
1037 | } | |||
1038 | ||||
1039 | /// Check that the type of a non-type template parameter is | |||
1040 | /// well-formed. | |||
1041 | /// | |||
1042 | /// \returns the (possibly-promoted) parameter type if valid; | |||
1043 | /// otherwise, produces a diagnostic and returns a NULL type. | |||
1044 | QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI, | |||
1045 | SourceLocation Loc) { | |||
1046 | if (TSI->getType()->isUndeducedType()) { | |||
1047 | // C++17 [temp.dep.expr]p3: | |||
1048 | // An id-expression is type-dependent if it contains | |||
1049 | // - an identifier associated by name lookup with a non-type | |||
1050 | // template-parameter declared with a type that contains a | |||
1051 | // placeholder type (7.1.7.4), | |||
1052 | TSI = SubstAutoTypeSourceInfo(TSI, Context.DependentTy); | |||
1053 | } | |||
1054 | ||||
1055 | return CheckNonTypeTemplateParameterType(TSI->getType(), Loc); | |||
1056 | } | |||
1057 | ||||
1058 | QualType Sema::CheckNonTypeTemplateParameterType(QualType T, | |||
1059 | SourceLocation Loc) { | |||
1060 | // We don't allow variably-modified types as the type of non-type template | |||
1061 | // parameters. | |||
1062 | if (T->isVariablyModifiedType()) { | |||
1063 | Diag(Loc, diag::err_variably_modified_nontype_template_param) | |||
1064 | << T; | |||
1065 | return QualType(); | |||
1066 | } | |||
1067 | ||||
1068 | // C++ [temp.param]p4: | |||
1069 | // | |||
1070 | // A non-type template-parameter shall have one of the following | |||
1071 | // (optionally cv-qualified) types: | |||
1072 | // | |||
1073 | // -- integral or enumeration type, | |||
1074 | if (T->isIntegralOrEnumerationType() || | |||
1075 | // -- pointer to object or pointer to function, | |||
1076 | T->isPointerType() || | |||
1077 | // -- reference to object or reference to function, | |||
1078 | T->isReferenceType() || | |||
1079 | // -- pointer to member, | |||
1080 | T->isMemberPointerType() || | |||
1081 | // -- std::nullptr_t. | |||
1082 | T->isNullPtrType() || | |||
1083 | // If T is a dependent type, we can't do the check now, so we | |||
1084 | // assume that it is well-formed. | |||
1085 | T->isDependentType() || | |||
1086 | // Allow use of auto in template parameter declarations. | |||
1087 | T->isUndeducedType()) { | |||
1088 | // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter | |||
1089 | // are ignored when determining its type. | |||
1090 | return T.getUnqualifiedType(); | |||
1091 | } | |||
1092 | ||||
1093 | // C++ [temp.param]p8: | |||
1094 | // | |||
1095 | // A non-type template-parameter of type "array of T" or | |||
1096 | // "function returning T" is adjusted to be of type "pointer to | |||
1097 | // T" or "pointer to function returning T", respectively. | |||
1098 | else if (T->isArrayType() || T->isFunctionType()) | |||
1099 | return Context.getDecayedType(T); | |||
1100 | ||||
1101 | Diag(Loc, diag::err_template_nontype_parm_bad_type) | |||
1102 | << T; | |||
1103 | ||||
1104 | return QualType(); | |||
1105 | } | |||
1106 | ||||
1107 | NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D, | |||
1108 | unsigned Depth, | |||
1109 | unsigned Position, | |||
1110 | SourceLocation EqualLoc, | |||
1111 | Expr *Default) { | |||
1112 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); | |||
1113 | ||||
1114 | // Check that we have valid decl-specifiers specified. | |||
1115 | auto CheckValidDeclSpecifiers = [this, &D] { | |||
1116 | // C++ [temp.param] | |||
1117 | // p1 | |||
1118 | // template-parameter: | |||
1119 | // ... | |||
1120 | // parameter-declaration | |||
1121 | // p2 | |||
1122 | // ... A storage class shall not be specified in a template-parameter | |||
1123 | // declaration. | |||
1124 | // [dcl.typedef]p1: | |||
1125 | // The typedef specifier [...] shall not be used in the decl-specifier-seq | |||
1126 | // of a parameter-declaration | |||
1127 | const DeclSpec &DS = D.getDeclSpec(); | |||
1128 | auto EmitDiag = [this](SourceLocation Loc) { | |||
1129 | Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm) | |||
1130 | << FixItHint::CreateRemoval(Loc); | |||
1131 | }; | |||
1132 | if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) | |||
1133 | EmitDiag(DS.getStorageClassSpecLoc()); | |||
1134 | ||||
1135 | if (DS.getThreadStorageClassSpec() != TSCS_unspecified) | |||
1136 | EmitDiag(DS.getThreadStorageClassSpecLoc()); | |||
1137 | ||||
1138 | // [dcl.inline]p1: | |||
1139 | // The inline specifier can be applied only to the declaration or | |||
1140 | // definition of a variable or function. | |||
1141 | ||||
1142 | if (DS.isInlineSpecified()) | |||
1143 | EmitDiag(DS.getInlineSpecLoc()); | |||
1144 | ||||
1145 | // [dcl.constexpr]p1: | |||
1146 | // The constexpr specifier shall be applied only to the definition of a | |||
1147 | // variable or variable template or the declaration of a function or | |||
1148 | // function template. | |||
1149 | ||||
1150 | if (DS.isConstexprSpecified()) | |||
1151 | EmitDiag(DS.getConstexprSpecLoc()); | |||
1152 | ||||
1153 | // [dcl.fct.spec]p1: | |||
1154 | // Function-specifiers can be used only in function declarations. | |||
1155 | ||||
1156 | if (DS.isVirtualSpecified()) | |||
1157 | EmitDiag(DS.getVirtualSpecLoc()); | |||
1158 | ||||
1159 | if (DS.hasExplicitSpecifier()) | |||
1160 | EmitDiag(DS.getExplicitSpecLoc()); | |||
1161 | ||||
1162 | if (DS.isNoreturnSpecified()) | |||
1163 | EmitDiag(DS.getNoreturnSpecLoc()); | |||
1164 | }; | |||
1165 | ||||
1166 | CheckValidDeclSpecifiers(); | |||
1167 | ||||
1168 | if (TInfo->getType()->isUndeducedType()) { | |||
1169 | Diag(D.getIdentifierLoc(), | |||
1170 | diag::warn_cxx14_compat_template_nontype_parm_auto_type) | |||
1171 | << QualType(TInfo->getType()->getContainedAutoType(), 0); | |||
1172 | } | |||
1173 | ||||
1174 | assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1175, __PRETTY_FUNCTION__)) | |||
1175 | "Non-type template parameter not in template parameter scope!")((S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1175, __PRETTY_FUNCTION__)); | |||
1176 | bool Invalid = false; | |||
1177 | ||||
1178 | QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc()); | |||
1179 | if (T.isNull()) { | |||
1180 | T = Context.IntTy; // Recover with an 'int' type. | |||
1181 | Invalid = true; | |||
1182 | } | |||
1183 | ||||
1184 | IdentifierInfo *ParamName = D.getIdentifier(); | |||
1185 | bool IsParameterPack = D.hasEllipsis(); | |||
1186 | NonTypeTemplateParmDecl *Param = NonTypeTemplateParmDecl::Create( | |||
1187 | Context, Context.getTranslationUnitDecl(), D.getBeginLoc(), | |||
1188 | D.getIdentifierLoc(), Depth, Position, ParamName, T, IsParameterPack, | |||
1189 | TInfo); | |||
1190 | Param->setAccess(AS_public); | |||
1191 | ||||
1192 | if (Invalid) | |||
1193 | Param->setInvalidDecl(); | |||
1194 | ||||
1195 | if (ParamName) { | |||
1196 | maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(), | |||
1197 | ParamName); | |||
1198 | ||||
1199 | // Add the template parameter into the current scope. | |||
1200 | S->AddDecl(Param); | |||
1201 | IdResolver.AddDecl(Param); | |||
1202 | } | |||
1203 | ||||
1204 | // C++0x [temp.param]p9: | |||
1205 | // A default template-argument may be specified for any kind of | |||
1206 | // template-parameter that is not a template parameter pack. | |||
1207 | if (Default && IsParameterPack) { | |||
1208 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); | |||
1209 | Default = nullptr; | |||
1210 | } | |||
1211 | ||||
1212 | // Check the well-formedness of the default template argument, if provided. | |||
1213 | if (Default) { | |||
1214 | // Check for unexpanded parameter packs. | |||
1215 | if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument)) | |||
1216 | return Param; | |||
1217 | ||||
1218 | TemplateArgument Converted; | |||
1219 | ExprResult DefaultRes = | |||
1220 | CheckTemplateArgument(Param, Param->getType(), Default, Converted); | |||
1221 | if (DefaultRes.isInvalid()) { | |||
1222 | Param->setInvalidDecl(); | |||
1223 | return Param; | |||
1224 | } | |||
1225 | Default = DefaultRes.get(); | |||
1226 | ||||
1227 | Param->setDefaultArgument(Default); | |||
1228 | } | |||
1229 | ||||
1230 | return Param; | |||
1231 | } | |||
1232 | ||||
1233 | /// ActOnTemplateTemplateParameter - Called when a C++ template template | |||
1234 | /// parameter (e.g. T in template <template \<typename> class T> class array) | |||
1235 | /// has been parsed. S is the current scope. | |||
1236 | NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S, | |||
1237 | SourceLocation TmpLoc, | |||
1238 | TemplateParameterList *Params, | |||
1239 | SourceLocation EllipsisLoc, | |||
1240 | IdentifierInfo *Name, | |||
1241 | SourceLocation NameLoc, | |||
1242 | unsigned Depth, | |||
1243 | unsigned Position, | |||
1244 | SourceLocation EqualLoc, | |||
1245 | ParsedTemplateArgument Default) { | |||
1246 | assert(S->isTemplateParamScope() &&((S->isTemplateParamScope() && "Template template parameter not in template parameter scope!" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1247, __PRETTY_FUNCTION__)) | |||
1247 | "Template template parameter not in template parameter scope!")((S->isTemplateParamScope() && "Template template parameter not in template parameter scope!" ) ? static_cast<void> (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1247, __PRETTY_FUNCTION__)); | |||
1248 | ||||
1249 | // Construct the parameter object. | |||
1250 | bool IsParameterPack = EllipsisLoc.isValid(); | |||
1251 | TemplateTemplateParmDecl *Param = | |||
1252 | TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(), | |||
1253 | NameLoc.isInvalid()? TmpLoc : NameLoc, | |||
1254 | Depth, Position, IsParameterPack, | |||
1255 | Name, Params); | |||
1256 | Param->setAccess(AS_public); | |||
1257 | ||||
1258 | // If the template template parameter has a name, then link the identifier | |||
1259 | // into the scope and lookup mechanisms. | |||
1260 | if (Name) { | |||
1261 | maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name); | |||
1262 | ||||
1263 | S->AddDecl(Param); | |||
1264 | IdResolver.AddDecl(Param); | |||
1265 | } | |||
1266 | ||||
1267 | if (Params->size() == 0) { | |||
1268 | Diag(Param->getLocation(), diag::err_template_template_parm_no_parms) | |||
1269 | << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc()); | |||
1270 | Param->setInvalidDecl(); | |||
1271 | } | |||
1272 | ||||
1273 | // C++0x [temp.param]p9: | |||
1274 | // A default template-argument may be specified for any kind of | |||
1275 | // template-parameter that is not a template parameter pack. | |||
1276 | if (IsParameterPack && !Default.isInvalid()) { | |||
1277 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); | |||
1278 | Default = ParsedTemplateArgument(); | |||
1279 | } | |||
1280 | ||||
1281 | if (!Default.isInvalid()) { | |||
1282 | // Check only that we have a template template argument. We don't want to | |||
1283 | // try to check well-formedness now, because our template template parameter | |||
1284 | // might have dependent types in its template parameters, which we wouldn't | |||
1285 | // be able to match now. | |||
1286 | // | |||
1287 | // If none of the template template parameter's template arguments mention | |||
1288 | // other template parameters, we could actually perform more checking here. | |||
1289 | // However, it isn't worth doing. | |||
1290 | TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default); | |||
1291 | if (DefaultArg.getArgument().getAsTemplate().isNull()) { | |||
1292 | Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template) | |||
1293 | << DefaultArg.getSourceRange(); | |||
1294 | return Param; | |||
1295 | } | |||
1296 | ||||
1297 | // Check for unexpanded parameter packs. | |||
1298 | if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(), | |||
1299 | DefaultArg.getArgument().getAsTemplate(), | |||
1300 | UPPC_DefaultArgument)) | |||
1301 | return Param; | |||
1302 | ||||
1303 | Param->setDefaultArgument(Context, DefaultArg); | |||
1304 | } | |||
1305 | ||||
1306 | return Param; | |||
1307 | } | |||
1308 | ||||
1309 | /// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally | |||
1310 | /// constrained by RequiresClause, that contains the template parameters in | |||
1311 | /// Params. | |||
1312 | TemplateParameterList * | |||
1313 | Sema::ActOnTemplateParameterList(unsigned Depth, | |||
1314 | SourceLocation ExportLoc, | |||
1315 | SourceLocation TemplateLoc, | |||
1316 | SourceLocation LAngleLoc, | |||
1317 | ArrayRef<NamedDecl *> Params, | |||
1318 | SourceLocation RAngleLoc, | |||
1319 | Expr *RequiresClause) { | |||
1320 | if (ExportLoc.isValid()) | |||
1321 | Diag(ExportLoc, diag::warn_template_export_unsupported); | |||
1322 | ||||
1323 | return TemplateParameterList::Create( | |||
1324 | Context, TemplateLoc, LAngleLoc, | |||
1325 | llvm::makeArrayRef(Params.data(), Params.size()), | |||
1326 | RAngleLoc, RequiresClause); | |||
1327 | } | |||
1328 | ||||
1329 | static void SetNestedNameSpecifier(Sema &S, TagDecl *T, | |||
1330 | const CXXScopeSpec &SS) { | |||
1331 | if (SS.isSet()) | |||
1332 | T->setQualifierInfo(SS.getWithLocInContext(S.Context)); | |||
1333 | } | |||
1334 | ||||
1335 | DeclResult Sema::CheckClassTemplate( | |||
1336 | Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc, | |||
1337 | CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc, | |||
1338 | const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams, | |||
1339 | AccessSpecifier AS, SourceLocation ModulePrivateLoc, | |||
1340 | SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists, | |||
1341 | TemplateParameterList **OuterTemplateParamLists, SkipBodyInfo *SkipBody) { | |||
1342 | assert(TemplateParams && TemplateParams->size() > 0 &&((TemplateParams && TemplateParams->size() > 0 && "No template parameters") ? static_cast<void> (0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1343, __PRETTY_FUNCTION__)) | |||
1343 | "No template parameters")((TemplateParams && TemplateParams->size() > 0 && "No template parameters") ? static_cast<void> (0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1343, __PRETTY_FUNCTION__)); | |||
1344 | assert(TUK != TUK_Reference && "Can only declare or define class templates")((TUK != TUK_Reference && "Can only declare or define class templates" ) ? static_cast<void> (0) : __assert_fail ("TUK != TUK_Reference && \"Can only declare or define class templates\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1344, __PRETTY_FUNCTION__)); | |||
1345 | bool Invalid = false; | |||
1346 | ||||
1347 | // Check that we can declare a template here. | |||
1348 | if (CheckTemplateDeclScope(S, TemplateParams)) | |||
1349 | return true; | |||
1350 | ||||
1351 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | |||
1352 | assert(Kind != TTK_Enum && "can't build template of enumerated type")((Kind != TTK_Enum && "can't build template of enumerated type" ) ? static_cast<void> (0) : __assert_fail ("Kind != TTK_Enum && \"can't build template of enumerated type\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1352, __PRETTY_FUNCTION__)); | |||
1353 | ||||
1354 | // There is no such thing as an unnamed class template. | |||
1355 | if (!Name) { | |||
1356 | Diag(KWLoc, diag::err_template_unnamed_class); | |||
1357 | return true; | |||
1358 | } | |||
1359 | ||||
1360 | // Find any previous declaration with this name. For a friend with no | |||
1361 | // scope explicitly specified, we only look for tag declarations (per | |||
1362 | // C++11 [basic.lookup.elab]p2). | |||
1363 | DeclContext *SemanticContext; | |||
1364 | LookupResult Previous(*this, Name, NameLoc, | |||
1365 | (SS.isEmpty() && TUK == TUK_Friend) | |||
1366 | ? LookupTagName : LookupOrdinaryName, | |||
1367 | forRedeclarationInCurContext()); | |||
1368 | if (SS.isNotEmpty() && !SS.isInvalid()) { | |||
1369 | SemanticContext = computeDeclContext(SS, true); | |||
1370 | if (!SemanticContext) { | |||
1371 | // FIXME: Horrible, horrible hack! We can't currently represent this | |||
1372 | // in the AST, and historically we have just ignored such friend | |||
1373 | // class templates, so don't complain here. | |||
1374 | Diag(NameLoc, TUK == TUK_Friend | |||
1375 | ? diag::warn_template_qualified_friend_ignored | |||
1376 | : diag::err_template_qualified_declarator_no_match) | |||
1377 | << SS.getScopeRep() << SS.getRange(); | |||
1378 | return TUK != TUK_Friend; | |||
1379 | } | |||
1380 | ||||
1381 | if (RequireCompleteDeclContext(SS, SemanticContext)) | |||
1382 | return true; | |||
1383 | ||||
1384 | // If we're adding a template to a dependent context, we may need to | |||
1385 | // rebuilding some of the types used within the template parameter list, | |||
1386 | // now that we know what the current instantiation is. | |||
1387 | if (SemanticContext->isDependentContext()) { | |||
1388 | ContextRAII SavedContext(*this, SemanticContext); | |||
1389 | if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) | |||
1390 | Invalid = true; | |||
1391 | } else if (TUK != TUK_Friend && TUK != TUK_Reference) | |||
1392 | diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc, false); | |||
1393 | ||||
1394 | LookupQualifiedName(Previous, SemanticContext); | |||
1395 | } else { | |||
1396 | SemanticContext = CurContext; | |||
1397 | ||||
1398 | // C++14 [class.mem]p14: | |||
1399 | // If T is the name of a class, then each of the following shall have a | |||
1400 | // name different from T: | |||
1401 | // -- every member template of class T | |||
1402 | if (TUK != TUK_Friend && | |||
1403 | DiagnoseClassNameShadow(SemanticContext, | |||
1404 | DeclarationNameInfo(Name, NameLoc))) | |||
1405 | return true; | |||
1406 | ||||
1407 | LookupName(Previous, S); | |||
1408 | } | |||
1409 | ||||
1410 | if (Previous.isAmbiguous()) | |||
1411 | return true; | |||
1412 | ||||
1413 | NamedDecl *PrevDecl = nullptr; | |||
1414 | if (Previous.begin() != Previous.end()) | |||
1415 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); | |||
1416 | ||||
1417 | if (PrevDecl && PrevDecl->isTemplateParameter()) { | |||
1418 | // Maybe we will complain about the shadowed template parameter. | |||
1419 | DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); | |||
1420 | // Just pretend that we didn't see the previous declaration. | |||
1421 | PrevDecl = nullptr; | |||
1422 | } | |||
1423 | ||||
1424 | // If there is a previous declaration with the same name, check | |||
1425 | // whether this is a valid redeclaration. | |||
1426 | ClassTemplateDecl *PrevClassTemplate = | |||
1427 | dyn_cast_or_null<ClassTemplateDecl>(PrevDecl); | |||
1428 | ||||
1429 | // We may have found the injected-class-name of a class template, | |||
1430 | // class template partial specialization, or class template specialization. | |||
1431 | // In these cases, grab the template that is being defined or specialized. | |||
1432 | if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) && | |||
1433 | cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) { | |||
1434 | PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext()); | |||
1435 | PrevClassTemplate | |||
1436 | = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate(); | |||
1437 | if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) { | |||
1438 | PrevClassTemplate | |||
1439 | = cast<ClassTemplateSpecializationDecl>(PrevDecl) | |||
1440 | ->getSpecializedTemplate(); | |||
1441 | } | |||
1442 | } | |||
1443 | ||||
1444 | if (TUK == TUK_Friend) { | |||
1445 | // C++ [namespace.memdef]p3: | |||
1446 | // [...] When looking for a prior declaration of a class or a function | |||
1447 | // declared as a friend, and when the name of the friend class or | |||
1448 | // function is neither a qualified name nor a template-id, scopes outside | |||
1449 | // the innermost enclosing namespace scope are not considered. | |||
1450 | if (!SS.isSet()) { | |||
1451 | DeclContext *OutermostContext = CurContext; | |||
1452 | while (!OutermostContext->isFileContext()) | |||
1453 | OutermostContext = OutermostContext->getLookupParent(); | |||
1454 | ||||
1455 | if (PrevDecl && | |||
1456 | (OutermostContext->Equals(PrevDecl->getDeclContext()) || | |||
1457 | OutermostContext->Encloses(PrevDecl->getDeclContext()))) { | |||
1458 | SemanticContext = PrevDecl->getDeclContext(); | |||
1459 | } else { | |||
1460 | // Declarations in outer scopes don't matter. However, the outermost | |||
1461 | // context we computed is the semantic context for our new | |||
1462 | // declaration. | |||
1463 | PrevDecl = PrevClassTemplate = nullptr; | |||
1464 | SemanticContext = OutermostContext; | |||
1465 | ||||
1466 | // Check that the chosen semantic context doesn't already contain a | |||
1467 | // declaration of this name as a non-tag type. | |||
1468 | Previous.clear(LookupOrdinaryName); | |||
1469 | DeclContext *LookupContext = SemanticContext; | |||
1470 | while (LookupContext->isTransparentContext()) | |||
1471 | LookupContext = LookupContext->getLookupParent(); | |||
1472 | LookupQualifiedName(Previous, LookupContext); | |||
1473 | ||||
1474 | if (Previous.isAmbiguous()) | |||
1475 | return true; | |||
1476 | ||||
1477 | if (Previous.begin() != Previous.end()) | |||
1478 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); | |||
1479 | } | |||
1480 | } | |||
1481 | } else if (PrevDecl && | |||
1482 | !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext, | |||
1483 | S, SS.isValid())) | |||
1484 | PrevDecl = PrevClassTemplate = nullptr; | |||
1485 | ||||
1486 | if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>( | |||
1487 | PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) { | |||
1488 | if (SS.isEmpty() && | |||
1489 | !(PrevClassTemplate && | |||
1490 | PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals( | |||
1491 | SemanticContext->getRedeclContext()))) { | |||
1492 | Diag(KWLoc, diag::err_using_decl_conflict_reverse); | |||
1493 | Diag(Shadow->getTargetDecl()->getLocation(), | |||
1494 | diag::note_using_decl_target); | |||
1495 | Diag(Shadow->getUsingDecl()->getLocation(), diag::note_using_decl) << 0; | |||
1496 | // Recover by ignoring the old declaration. | |||
1497 | PrevDecl = PrevClassTemplate = nullptr; | |||
1498 | } | |||
1499 | } | |||
1500 | ||||
1501 | // TODO Memory management; associated constraints are not always stored. | |||
1502 | Expr *const CurAC = formAssociatedConstraints(TemplateParams, nullptr); | |||
1503 | ||||
1504 | if (PrevClassTemplate) { | |||
1505 | // Ensure that the template parameter lists are compatible. Skip this check | |||
1506 | // for a friend in a dependent context: the template parameter list itself | |||
1507 | // could be dependent. | |||
1508 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && | |||
1509 | !TemplateParameterListsAreEqual(TemplateParams, | |||
1510 | PrevClassTemplate->getTemplateParameters(), | |||
1511 | /*Complain=*/true, | |||
1512 | TPL_TemplateMatch)) | |||
1513 | return true; | |||
1514 | ||||
1515 | // Check for matching associated constraints on redeclarations. | |||
1516 | const Expr *const PrevAC = PrevClassTemplate->getAssociatedConstraints(); | |||
1517 | const bool RedeclACMismatch = [&] { | |||
1518 | if (!(CurAC || PrevAC)) | |||
1519 | return false; // Nothing to check; no mismatch. | |||
1520 | if (CurAC && PrevAC) { | |||
1521 | llvm::FoldingSetNodeID CurACInfo, PrevACInfo; | |||
1522 | CurAC->Profile(CurACInfo, Context, /*Canonical=*/true); | |||
1523 | PrevAC->Profile(PrevACInfo, Context, /*Canonical=*/true); | |||
1524 | if (CurACInfo == PrevACInfo) | |||
1525 | return false; // All good; no mismatch. | |||
1526 | } | |||
1527 | return true; | |||
1528 | }(); | |||
1529 | ||||
1530 | if (RedeclACMismatch) { | |||
1531 | Diag(CurAC ? CurAC->getBeginLoc() : NameLoc, | |||
1532 | diag::err_template_different_associated_constraints); | |||
1533 | Diag(PrevAC ? PrevAC->getBeginLoc() : PrevClassTemplate->getLocation(), | |||
1534 | diag::note_template_prev_declaration) | |||
1535 | << /*declaration*/ 0; | |||
1536 | return true; | |||
1537 | } | |||
1538 | ||||
1539 | // C++ [temp.class]p4: | |||
1540 | // In a redeclaration, partial specialization, explicit | |||
1541 | // specialization or explicit instantiation of a class template, | |||
1542 | // the class-key shall agree in kind with the original class | |||
1543 | // template declaration (7.1.5.3). | |||
1544 | RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl(); | |||
1545 | if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind, | |||
1546 | TUK == TUK_Definition, KWLoc, Name)) { | |||
1547 | Diag(KWLoc, diag::err_use_with_wrong_tag) | |||
1548 | << Name | |||
1549 | << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName()); | |||
1550 | Diag(PrevRecordDecl->getLocation(), diag::note_previous_use); | |||
1551 | Kind = PrevRecordDecl->getTagKind(); | |||
1552 | } | |||
1553 | ||||
1554 | // Check for redefinition of this class template. | |||
1555 | if (TUK == TUK_Definition) { | |||
1556 | if (TagDecl *Def = PrevRecordDecl->getDefinition()) { | |||
1557 | // If we have a prior definition that is not visible, treat this as | |||
1558 | // simply making that previous definition visible. | |||
1559 | NamedDecl *Hidden = nullptr; | |||
1560 | if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) { | |||
1561 | SkipBody->ShouldSkip = true; | |||
1562 | SkipBody->Previous = Def; | |||
1563 | auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate(); | |||
1564 | assert(Tmpl && "original definition of a class template is not a "((Tmpl && "original definition of a class template is not a " "class template?") ? static_cast<void> (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1565, __PRETTY_FUNCTION__)) | |||
1565 | "class template?")((Tmpl && "original definition of a class template is not a " "class template?") ? static_cast<void> (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1565, __PRETTY_FUNCTION__)); | |||
1566 | makeMergedDefinitionVisible(Hidden); | |||
1567 | makeMergedDefinitionVisible(Tmpl); | |||
1568 | } else { | |||
1569 | Diag(NameLoc, diag::err_redefinition) << Name; | |||
1570 | Diag(Def->getLocation(), diag::note_previous_definition); | |||
1571 | // FIXME: Would it make sense to try to "forget" the previous | |||
1572 | // definition, as part of error recovery? | |||
1573 | return true; | |||
1574 | } | |||
1575 | } | |||
1576 | } | |||
1577 | } else if (PrevDecl) { | |||
1578 | // C++ [temp]p5: | |||
1579 | // A class template shall not have the same name as any other | |||
1580 | // template, class, function, object, enumeration, enumerator, | |||
1581 | // namespace, or type in the same scope (3.3), except as specified | |||
1582 | // in (14.5.4). | |||
1583 | Diag(NameLoc, diag::err_redefinition_different_kind) << Name; | |||
1584 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); | |||
1585 | return true; | |||
1586 | } | |||
1587 | ||||
1588 | // Check the template parameter list of this declaration, possibly | |||
1589 | // merging in the template parameter list from the previous class | |||
1590 | // template declaration. Skip this check for a friend in a dependent | |||
1591 | // context, because the template parameter list might be dependent. | |||
1592 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && | |||
1593 | CheckTemplateParameterList( | |||
1594 | TemplateParams, | |||
1595 | PrevClassTemplate | |||
1596 | ? PrevClassTemplate->getMostRecentDecl()->getTemplateParameters() | |||
1597 | : nullptr, | |||
1598 | (SS.isSet() && SemanticContext && SemanticContext->isRecord() && | |||
1599 | SemanticContext->isDependentContext()) | |||
1600 | ? TPC_ClassTemplateMember | |||
1601 | : TUK == TUK_Friend ? TPC_FriendClassTemplate : TPC_ClassTemplate, | |||
1602 | SkipBody)) | |||
1603 | Invalid = true; | |||
1604 | ||||
1605 | if (SS.isSet()) { | |||
1606 | // If the name of the template was qualified, we must be defining the | |||
1607 | // template out-of-line. | |||
1608 | if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) { | |||
1609 | Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match | |||
1610 | : diag::err_member_decl_does_not_match) | |||
1611 | << Name << SemanticContext << /*IsDefinition*/true << SS.getRange(); | |||
1612 | Invalid = true; | |||
1613 | } | |||
1614 | } | |||
1615 | ||||
1616 | // If this is a templated friend in a dependent context we should not put it | |||
1617 | // on the redecl chain. In some cases, the templated friend can be the most | |||
1618 | // recent declaration tricking the template instantiator to make substitutions | |||
1619 | // there. | |||
1620 | // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious | |||
1621 | bool ShouldAddRedecl | |||
1622 | = !(TUK == TUK_Friend && CurContext->isDependentContext()); | |||
1623 | ||||
1624 | CXXRecordDecl *NewClass = | |||
1625 | CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name, | |||
1626 | PrevClassTemplate && ShouldAddRedecl ? | |||
1627 | PrevClassTemplate->getTemplatedDecl() : nullptr, | |||
1628 | /*DelayTypeCreation=*/true); | |||
1629 | SetNestedNameSpecifier(*this, NewClass, SS); | |||
1630 | if (NumOuterTemplateParamLists > 0) | |||
1631 | NewClass->setTemplateParameterListsInfo( | |||
1632 | Context, llvm::makeArrayRef(OuterTemplateParamLists, | |||
1633 | NumOuterTemplateParamLists)); | |||
1634 | ||||
1635 | // Add alignment attributes if necessary; these attributes are checked when | |||
1636 | // the ASTContext lays out the structure. | |||
1637 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { | |||
1638 | AddAlignmentAttributesForRecord(NewClass); | |||
1639 | AddMsStructLayoutForRecord(NewClass); | |||
1640 | } | |||
1641 | ||||
1642 | // Attach the associated constraints when the declaration will not be part of | |||
1643 | // a decl chain. | |||
1644 | Expr *const ACtoAttach = | |||
1645 | PrevClassTemplate && ShouldAddRedecl ? nullptr : CurAC; | |||
1646 | ||||
1647 | ClassTemplateDecl *NewTemplate | |||
1648 | = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc, | |||
1649 | DeclarationName(Name), TemplateParams, | |||
1650 | NewClass, ACtoAttach); | |||
1651 | ||||
1652 | if (ShouldAddRedecl) | |||
1653 | NewTemplate->setPreviousDecl(PrevClassTemplate); | |||
1654 | ||||
1655 | NewClass->setDescribedClassTemplate(NewTemplate); | |||
1656 | ||||
1657 | if (ModulePrivateLoc.isValid()) | |||
1658 | NewTemplate->setModulePrivate(); | |||
1659 | ||||
1660 | // Build the type for the class template declaration now. | |||
1661 | QualType T = NewTemplate->getInjectedClassNameSpecialization(); | |||
1662 | T = Context.getInjectedClassNameType(NewClass, T); | |||
1663 | assert(T->isDependentType() && "Class template type is not dependent?")((T->isDependentType() && "Class template type is not dependent?" ) ? static_cast<void> (0) : __assert_fail ("T->isDependentType() && \"Class template type is not dependent?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1663, __PRETTY_FUNCTION__)); | |||
1664 | (void)T; | |||
1665 | ||||
1666 | // If we are providing an explicit specialization of a member that is a | |||
1667 | // class template, make a note of that. | |||
1668 | if (PrevClassTemplate && | |||
1669 | PrevClassTemplate->getInstantiatedFromMemberTemplate()) | |||
1670 | PrevClassTemplate->setMemberSpecialization(); | |||
1671 | ||||
1672 | // Set the access specifier. | |||
1673 | if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord()) | |||
1674 | SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS); | |||
1675 | ||||
1676 | // Set the lexical context of these templates | |||
1677 | NewClass->setLexicalDeclContext(CurContext); | |||
1678 | NewTemplate->setLexicalDeclContext(CurContext); | |||
1679 | ||||
1680 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) | |||
1681 | NewClass->startDefinition(); | |||
1682 | ||||
1683 | ProcessDeclAttributeList(S, NewClass, Attr); | |||
1684 | ||||
1685 | if (PrevClassTemplate) | |||
1686 | mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl()); | |||
1687 | ||||
1688 | AddPushedVisibilityAttribute(NewClass); | |||
1689 | ||||
1690 | if (TUK != TUK_Friend) { | |||
1691 | // Per C++ [basic.scope.temp]p2, skip the template parameter scopes. | |||
1692 | Scope *Outer = S; | |||
1693 | while ((Outer->getFlags() & Scope::TemplateParamScope) != 0) | |||
1694 | Outer = Outer->getParent(); | |||
1695 | PushOnScopeChains(NewTemplate, Outer); | |||
1696 | } else { | |||
1697 | if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) { | |||
1698 | NewTemplate->setAccess(PrevClassTemplate->getAccess()); | |||
1699 | NewClass->setAccess(PrevClassTemplate->getAccess()); | |||
1700 | } | |||
1701 | ||||
1702 | NewTemplate->setObjectOfFriendDecl(); | |||
1703 | ||||
1704 | // Friend templates are visible in fairly strange ways. | |||
1705 | if (!CurContext->isDependentContext()) { | |||
1706 | DeclContext *DC = SemanticContext->getRedeclContext(); | |||
1707 | DC->makeDeclVisibleInContext(NewTemplate); | |||
1708 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) | |||
1709 | PushOnScopeChains(NewTemplate, EnclosingScope, | |||
1710 | /* AddToContext = */ false); | |||
1711 | } | |||
1712 | ||||
1713 | FriendDecl *Friend = FriendDecl::Create( | |||
1714 | Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc); | |||
1715 | Friend->setAccess(AS_public); | |||
1716 | CurContext->addDecl(Friend); | |||
1717 | } | |||
1718 | ||||
1719 | if (PrevClassTemplate) | |||
1720 | CheckRedeclarationModuleOwnership(NewTemplate, PrevClassTemplate); | |||
1721 | ||||
1722 | if (Invalid) { | |||
1723 | NewTemplate->setInvalidDecl(); | |||
1724 | NewClass->setInvalidDecl(); | |||
1725 | } | |||
1726 | ||||
1727 | ActOnDocumentableDecl(NewTemplate); | |||
1728 | ||||
1729 | if (SkipBody && SkipBody->ShouldSkip) | |||
1730 | return SkipBody->Previous; | |||
1731 | ||||
1732 | return NewTemplate; | |||
1733 | } | |||
1734 | ||||
1735 | namespace { | |||
1736 | /// Tree transform to "extract" a transformed type from a class template's | |||
1737 | /// constructor to a deduction guide. | |||
1738 | class ExtractTypeForDeductionGuide | |||
1739 | : public TreeTransform<ExtractTypeForDeductionGuide> { | |||
1740 | public: | |||
1741 | typedef TreeTransform<ExtractTypeForDeductionGuide> Base; | |||
1742 | ExtractTypeForDeductionGuide(Sema &SemaRef) : Base(SemaRef) {} | |||
1743 | ||||
1744 | TypeSourceInfo *transform(TypeSourceInfo *TSI) { return TransformType(TSI); } | |||
1745 | ||||
1746 | QualType TransformTypedefType(TypeLocBuilder &TLB, TypedefTypeLoc TL) { | |||
1747 | return TransformType( | |||
1748 | TLB, | |||
1749 | TL.getTypedefNameDecl()->getTypeSourceInfo()->getTypeLoc()); | |||
1750 | } | |||
1751 | }; | |||
1752 | ||||
1753 | /// Transform to convert portions of a constructor declaration into the | |||
1754 | /// corresponding deduction guide, per C++1z [over.match.class.deduct]p1. | |||
1755 | struct ConvertConstructorToDeductionGuideTransform { | |||
1756 | ConvertConstructorToDeductionGuideTransform(Sema &S, | |||
1757 | ClassTemplateDecl *Template) | |||
1758 | : SemaRef(S), Template(Template) {} | |||
1759 | ||||
1760 | Sema &SemaRef; | |||
1761 | ClassTemplateDecl *Template; | |||
1762 | ||||
1763 | DeclContext *DC = Template->getDeclContext(); | |||
1764 | CXXRecordDecl *Primary = Template->getTemplatedDecl(); | |||
1765 | DeclarationName DeductionGuideName = | |||
1766 | SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template); | |||
1767 | ||||
1768 | QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary); | |||
1769 | ||||
1770 | // Index adjustment to apply to convert depth-1 template parameters into | |||
1771 | // depth-0 template parameters. | |||
1772 | unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size(); | |||
1773 | ||||
1774 | /// Transform a constructor declaration into a deduction guide. | |||
1775 | NamedDecl *transformConstructor(FunctionTemplateDecl *FTD, | |||
1776 | CXXConstructorDecl *CD) { | |||
1777 | SmallVector<TemplateArgument, 16> SubstArgs; | |||
1778 | ||||
1779 | LocalInstantiationScope Scope(SemaRef); | |||
1780 | ||||
1781 | // C++ [over.match.class.deduct]p1: | |||
1782 | // -- For each constructor of the class template designated by the | |||
1783 | // template-name, a function template with the following properties: | |||
1784 | ||||
1785 | // -- The template parameters are the template parameters of the class | |||
1786 | // template followed by the template parameters (including default | |||
1787 | // template arguments) of the constructor, if any. | |||
1788 | TemplateParameterList *TemplateParams = Template->getTemplateParameters(); | |||
1789 | if (FTD) { | |||
1790 | TemplateParameterList *InnerParams = FTD->getTemplateParameters(); | |||
1791 | SmallVector<NamedDecl *, 16> AllParams; | |||
1792 | AllParams.reserve(TemplateParams->size() + InnerParams->size()); | |||
1793 | AllParams.insert(AllParams.begin(), | |||
1794 | TemplateParams->begin(), TemplateParams->end()); | |||
1795 | SubstArgs.reserve(InnerParams->size()); | |||
1796 | ||||
1797 | // Later template parameters could refer to earlier ones, so build up | |||
1798 | // a list of substituted template arguments as we go. | |||
1799 | for (NamedDecl *Param : *InnerParams) { | |||
1800 | MultiLevelTemplateArgumentList Args; | |||
1801 | Args.addOuterTemplateArguments(SubstArgs); | |||
1802 | Args.addOuterRetainedLevel(); | |||
1803 | NamedDecl *NewParam = transformTemplateParameter(Param, Args); | |||
1804 | if (!NewParam) | |||
1805 | return nullptr; | |||
1806 | AllParams.push_back(NewParam); | |||
1807 | SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument( | |||
1808 | SemaRef.Context.getInjectedTemplateArg(NewParam))); | |||
1809 | } | |||
1810 | TemplateParams = TemplateParameterList::Create( | |||
1811 | SemaRef.Context, InnerParams->getTemplateLoc(), | |||
1812 | InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(), | |||
1813 | /*FIXME: RequiresClause*/ nullptr); | |||
1814 | } | |||
1815 | ||||
1816 | // If we built a new template-parameter-list, track that we need to | |||
1817 | // substitute references to the old parameters into references to the | |||
1818 | // new ones. | |||
1819 | MultiLevelTemplateArgumentList Args; | |||
1820 | if (FTD) { | |||
1821 | Args.addOuterTemplateArguments(SubstArgs); | |||
1822 | Args.addOuterRetainedLevel(); | |||
1823 | } | |||
1824 | ||||
1825 | FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc() | |||
1826 | .getAsAdjusted<FunctionProtoTypeLoc>(); | |||
1827 | assert(FPTL && "no prototype for constructor declaration")((FPTL && "no prototype for constructor declaration") ? static_cast<void> (0) : __assert_fail ("FPTL && \"no prototype for constructor declaration\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1827, __PRETTY_FUNCTION__)); | |||
1828 | ||||
1829 | // Transform the type of the function, adjusting the return type and | |||
1830 | // replacing references to the old parameters with references to the | |||
1831 | // new ones. | |||
1832 | TypeLocBuilder TLB; | |||
1833 | SmallVector<ParmVarDecl*, 8> Params; | |||
1834 | QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args); | |||
1835 | if (NewType.isNull()) | |||
1836 | return nullptr; | |||
1837 | TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType); | |||
1838 | ||||
1839 | return buildDeductionGuide(TemplateParams, CD->getExplicitSpecifier(), | |||
1840 | NewTInfo, CD->getBeginLoc(), CD->getLocation(), | |||
1841 | CD->getEndLoc()); | |||
1842 | } | |||
1843 | ||||
1844 | /// Build a deduction guide with the specified parameter types. | |||
1845 | NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) { | |||
1846 | SourceLocation Loc = Template->getLocation(); | |||
1847 | ||||
1848 | // Build the requested type. | |||
1849 | FunctionProtoType::ExtProtoInfo EPI; | |||
1850 | EPI.HasTrailingReturn = true; | |||
1851 | QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc, | |||
1852 | DeductionGuideName, EPI); | |||
1853 | TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc); | |||
1854 | ||||
1855 | FunctionProtoTypeLoc FPTL = | |||
1856 | TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>(); | |||
1857 | ||||
1858 | // Build the parameters, needed during deduction / substitution. | |||
1859 | SmallVector<ParmVarDecl*, 4> Params; | |||
1860 | for (auto T : ParamTypes) { | |||
1861 | ParmVarDecl *NewParam = ParmVarDecl::Create( | |||
1862 | SemaRef.Context, DC, Loc, Loc, nullptr, T, | |||
1863 | SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr); | |||
1864 | NewParam->setScopeInfo(0, Params.size()); | |||
1865 | FPTL.setParam(Params.size(), NewParam); | |||
1866 | Params.push_back(NewParam); | |||
1867 | } | |||
1868 | ||||
1869 | return buildDeductionGuide(Template->getTemplateParameters(), | |||
1870 | ExplicitSpecifier(), TSI, Loc, Loc, Loc); | |||
1871 | } | |||
1872 | ||||
1873 | private: | |||
1874 | /// Transform a constructor template parameter into a deduction guide template | |||
1875 | /// parameter, rebuilding any internal references to earlier parameters and | |||
1876 | /// renumbering as we go. | |||
1877 | NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam, | |||
1878 | MultiLevelTemplateArgumentList &Args) { | |||
1879 | if (auto *TTP = dyn_cast<TemplateTypeParmDecl>(TemplateParam)) { | |||
1880 | // TemplateTypeParmDecl's index cannot be changed after creation, so | |||
1881 | // substitute it directly. | |||
1882 | auto *NewTTP = TemplateTypeParmDecl::Create( | |||
1883 | SemaRef.Context, DC, TTP->getBeginLoc(), TTP->getLocation(), | |||
1884 | /*Depth*/ 0, Depth1IndexAdjustment + TTP->getIndex(), | |||
1885 | TTP->getIdentifier(), TTP->wasDeclaredWithTypename(), | |||
1886 | TTP->isParameterPack()); | |||
1887 | if (TTP->hasDefaultArgument()) { | |||
1888 | TypeSourceInfo *InstantiatedDefaultArg = | |||
1889 | SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args, | |||
1890 | TTP->getDefaultArgumentLoc(), TTP->getDeclName()); | |||
1891 | if (InstantiatedDefaultArg) | |||
1892 | NewTTP->setDefaultArgument(InstantiatedDefaultArg); | |||
1893 | } | |||
1894 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam, | |||
1895 | NewTTP); | |||
1896 | return NewTTP; | |||
1897 | } | |||
1898 | ||||
1899 | if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TemplateParam)) | |||
1900 | return transformTemplateParameterImpl(TTP, Args); | |||
1901 | ||||
1902 | return transformTemplateParameterImpl( | |||
1903 | cast<NonTypeTemplateParmDecl>(TemplateParam), Args); | |||
1904 | } | |||
1905 | template<typename TemplateParmDecl> | |||
1906 | TemplateParmDecl * | |||
1907 | transformTemplateParameterImpl(TemplateParmDecl *OldParam, | |||
1908 | MultiLevelTemplateArgumentList &Args) { | |||
1909 | // Ask the template instantiator to do the heavy lifting for us, then adjust | |||
1910 | // the index of the parameter once it's done. | |||
1911 | auto *NewParam = | |||
1912 | cast_or_null<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args)); | |||
1913 | assert(NewParam->getDepth() == 0 && "unexpected template param depth")((NewParam->getDepth() == 0 && "unexpected template param depth" ) ? static_cast<void> (0) : __assert_fail ("NewParam->getDepth() == 0 && \"unexpected template param depth\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 1913, __PRETTY_FUNCTION__)); | |||
1914 | NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment); | |||
1915 | return NewParam; | |||
1916 | } | |||
1917 | ||||
1918 | QualType transformFunctionProtoType(TypeLocBuilder &TLB, | |||
1919 | FunctionProtoTypeLoc TL, | |||
1920 | SmallVectorImpl<ParmVarDecl*> &Params, | |||
1921 | MultiLevelTemplateArgumentList &Args) { | |||
1922 | SmallVector<QualType, 4> ParamTypes; | |||
1923 | const FunctionProtoType *T = TL.getTypePtr(); | |||
1924 | ||||
1925 | // -- The types of the function parameters are those of the constructor. | |||
1926 | for (auto *OldParam : TL.getParams()) { | |||
1927 | ParmVarDecl *NewParam = transformFunctionTypeParam(OldParam, Args); | |||
1928 | if (!NewParam) | |||
1929 | return QualType(); | |||
1930 | ParamTypes.push_back(NewParam->getType()); | |||
1931 | Params.push_back(NewParam); | |||
1932 | } | |||
1933 | ||||
1934 | // -- The return type is the class template specialization designated by | |||
1935 | // the template-name and template arguments corresponding to the | |||
1936 | // template parameters obtained from the class template. | |||
1937 | // | |||
1938 | // We use the injected-class-name type of the primary template instead. | |||
1939 | // This has the convenient property that it is different from any type that | |||
1940 | // the user can write in a deduction-guide (because they cannot enter the | |||
1941 | // context of the template), so implicit deduction guides can never collide | |||
1942 | // with explicit ones. | |||
1943 | QualType ReturnType = DeducedType; | |||
1944 | TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation()); | |||
1945 | ||||
1946 | // Resolving a wording defect, we also inherit the variadicness of the | |||
1947 | // constructor. | |||
1948 | FunctionProtoType::ExtProtoInfo EPI; | |||
1949 | EPI.Variadic = T->isVariadic(); | |||
1950 | EPI.HasTrailingReturn = true; | |||
1951 | ||||
1952 | QualType Result = SemaRef.BuildFunctionType( | |||
1953 | ReturnType, ParamTypes, TL.getBeginLoc(), DeductionGuideName, EPI); | |||
1954 | if (Result.isNull()) | |||
1955 | return QualType(); | |||
1956 | ||||
1957 | FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result); | |||
1958 | NewTL.setLocalRangeBegin(TL.getLocalRangeBegin()); | |||
1959 | NewTL.setLParenLoc(TL.getLParenLoc()); | |||
1960 | NewTL.setRParenLoc(TL.getRParenLoc()); | |||
1961 | NewTL.setExceptionSpecRange(SourceRange()); | |||
1962 | NewTL.setLocalRangeEnd(TL.getLocalRangeEnd()); | |||
1963 | for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I) | |||
1964 | NewTL.setParam(I, Params[I]); | |||
1965 | ||||
1966 | return Result; | |||
1967 | } | |||
1968 | ||||
1969 | ParmVarDecl * | |||
1970 | transformFunctionTypeParam(ParmVarDecl *OldParam, | |||
1971 | MultiLevelTemplateArgumentList &Args) { | |||
1972 | TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo(); | |||
1973 | TypeSourceInfo *NewDI; | |||
1974 | if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) { | |||
1975 | // Expand out the one and only element in each inner pack. | |||
1976 | Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0); | |||
1977 | NewDI = | |||
1978 | SemaRef.SubstType(PackTL.getPatternLoc(), Args, | |||
1979 | OldParam->getLocation(), OldParam->getDeclName()); | |||
1980 | if (!NewDI) return nullptr; | |||
1981 | NewDI = | |||
1982 | SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(), | |||
1983 | PackTL.getTypePtr()->getNumExpansions()); | |||
1984 | } else | |||
1985 | NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(), | |||
1986 | OldParam->getDeclName()); | |||
1987 | if (!NewDI) | |||
1988 | return nullptr; | |||
1989 | ||||
1990 | // Extract the type. This (for instance) replaces references to typedef | |||
1991 | // members of the current instantiations with the definitions of those | |||
1992 | // typedefs, avoiding triggering instantiation of the deduced type during | |||
1993 | // deduction. | |||
1994 | NewDI = ExtractTypeForDeductionGuide(SemaRef).transform(NewDI); | |||
1995 | ||||
1996 | // Resolving a wording defect, we also inherit default arguments from the | |||
1997 | // constructor. | |||
1998 | ExprResult NewDefArg; | |||
1999 | if (OldParam->hasDefaultArg()) { | |||
2000 | NewDefArg = SemaRef.SubstExpr(OldParam->getDefaultArg(), Args); | |||
2001 | if (NewDefArg.isInvalid()) | |||
2002 | return nullptr; | |||
2003 | } | |||
2004 | ||||
2005 | ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC, | |||
2006 | OldParam->getInnerLocStart(), | |||
2007 | OldParam->getLocation(), | |||
2008 | OldParam->getIdentifier(), | |||
2009 | NewDI->getType(), | |||
2010 | NewDI, | |||
2011 | OldParam->getStorageClass(), | |||
2012 | NewDefArg.get()); | |||
2013 | NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(), | |||
2014 | OldParam->getFunctionScopeIndex()); | |||
2015 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, NewParam); | |||
2016 | return NewParam; | |||
2017 | } | |||
2018 | ||||
2019 | NamedDecl *buildDeductionGuide(TemplateParameterList *TemplateParams, | |||
2020 | ExplicitSpecifier ES, TypeSourceInfo *TInfo, | |||
2021 | SourceLocation LocStart, SourceLocation Loc, | |||
2022 | SourceLocation LocEnd) { | |||
2023 | DeclarationNameInfo Name(DeductionGuideName, Loc); | |||
2024 | ArrayRef<ParmVarDecl *> Params = | |||
2025 | TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams(); | |||
2026 | ||||
2027 | // Build the implicit deduction guide template. | |||
2028 | auto *Guide = | |||
2029 | CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, ES, Name, | |||
2030 | TInfo->getType(), TInfo, LocEnd); | |||
2031 | Guide->setImplicit(); | |||
2032 | Guide->setParams(Params); | |||
2033 | ||||
2034 | for (auto *Param : Params) | |||
2035 | Param->setDeclContext(Guide); | |||
2036 | ||||
2037 | auto *GuideTemplate = FunctionTemplateDecl::Create( | |||
2038 | SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide); | |||
2039 | GuideTemplate->setImplicit(); | |||
2040 | Guide->setDescribedFunctionTemplate(GuideTemplate); | |||
2041 | ||||
2042 | if (isa<CXXRecordDecl>(DC)) { | |||
2043 | Guide->setAccess(AS_public); | |||
2044 | GuideTemplate->setAccess(AS_public); | |||
2045 | } | |||
2046 | ||||
2047 | DC->addDecl(GuideTemplate); | |||
2048 | return GuideTemplate; | |||
2049 | } | |||
2050 | }; | |||
2051 | } | |||
2052 | ||||
2053 | void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template, | |||
2054 | SourceLocation Loc) { | |||
2055 | DeclContext *DC = Template->getDeclContext(); | |||
2056 | if (DC->isDependentContext()) | |||
2057 | return; | |||
2058 | ||||
2059 | ConvertConstructorToDeductionGuideTransform Transform( | |||
2060 | *this, cast<ClassTemplateDecl>(Template)); | |||
2061 | if (!isCompleteType(Loc, Transform.DeducedType)) | |||
2062 | return; | |||
2063 | ||||
2064 | // Check whether we've already declared deduction guides for this template. | |||
2065 | // FIXME: Consider storing a flag on the template to indicate this. | |||
2066 | auto Existing = DC->lookup(Transform.DeductionGuideName); | |||
2067 | for (auto *D : Existing) | |||
2068 | if (D->isImplicit()) | |||
2069 | return; | |||
2070 | ||||
2071 | // In case we were expanding a pack when we attempted to declare deduction | |||
2072 | // guides, turn off pack expansion for everything we're about to do. | |||
2073 | ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1); | |||
2074 | // Create a template instantiation record to track the "instantiation" of | |||
2075 | // constructors into deduction guides. | |||
2076 | // FIXME: Add a kind for this to give more meaningful diagnostics. But can | |||
2077 | // this substitution process actually fail? | |||
2078 | InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template); | |||
2079 | if (BuildingDeductionGuides.isInvalid()) | |||
2080 | return; | |||
2081 | ||||
2082 | // Convert declared constructors into deduction guide templates. | |||
2083 | // FIXME: Skip constructors for which deduction must necessarily fail (those | |||
2084 | // for which some class template parameter without a default argument never | |||
2085 | // appears in a deduced context). | |||
2086 | bool AddedAny = false; | |||
2087 | for (NamedDecl *D : LookupConstructors(Transform.Primary)) { | |||
2088 | D = D->getUnderlyingDecl(); | |||
2089 | if (D->isInvalidDecl() || D->isImplicit()) | |||
2090 | continue; | |||
2091 | D = cast<NamedDecl>(D->getCanonicalDecl()); | |||
2092 | ||||
2093 | auto *FTD = dyn_cast<FunctionTemplateDecl>(D); | |||
2094 | auto *CD = | |||
2095 | dyn_cast_or_null<CXXConstructorDecl>(FTD ? FTD->getTemplatedDecl() : D); | |||
2096 | // Class-scope explicit specializations (MS extension) do not result in | |||
2097 | // deduction guides. | |||
2098 | if (!CD || (!FTD && CD->isFunctionTemplateSpecialization())) | |||
2099 | continue; | |||
2100 | ||||
2101 | Transform.transformConstructor(FTD, CD); | |||
2102 | AddedAny = true; | |||
2103 | } | |||
2104 | ||||
2105 | // C++17 [over.match.class.deduct] | |||
2106 | // -- If C is not defined or does not declare any constructors, an | |||
2107 | // additional function template derived as above from a hypothetical | |||
2108 | // constructor C(). | |||
2109 | if (!AddedAny) | |||
2110 | Transform.buildSimpleDeductionGuide(None); | |||
2111 | ||||
2112 | // -- An additional function template derived as above from a hypothetical | |||
2113 | // constructor C(C), called the copy deduction candidate. | |||
2114 | cast<CXXDeductionGuideDecl>( | |||
2115 | cast<FunctionTemplateDecl>( | |||
2116 | Transform.buildSimpleDeductionGuide(Transform.DeducedType)) | |||
2117 | ->getTemplatedDecl()) | |||
2118 | ->setIsCopyDeductionCandidate(); | |||
2119 | } | |||
2120 | ||||
2121 | /// Diagnose the presence of a default template argument on a | |||
2122 | /// template parameter, which is ill-formed in certain contexts. | |||
2123 | /// | |||
2124 | /// \returns true if the default template argument should be dropped. | |||
2125 | static bool DiagnoseDefaultTemplateArgument(Sema &S, | |||
2126 | Sema::TemplateParamListContext TPC, | |||
2127 | SourceLocation ParamLoc, | |||
2128 | SourceRange DefArgRange) { | |||
2129 | switch (TPC) { | |||
2130 | case Sema::TPC_ClassTemplate: | |||
2131 | case Sema::TPC_VarTemplate: | |||
2132 | case Sema::TPC_TypeAliasTemplate: | |||
2133 | return false; | |||
2134 | ||||
2135 | case Sema::TPC_FunctionTemplate: | |||
2136 | case Sema::TPC_FriendFunctionTemplateDefinition: | |||
2137 | // C++ [temp.param]p9: | |||
2138 | // A default template-argument shall not be specified in a | |||
2139 | // function template declaration or a function template | |||
2140 | // definition [...] | |||
2141 | // If a friend function template declaration specifies a default | |||
2142 | // template-argument, that declaration shall be a definition and shall be | |||
2143 | // the only declaration of the function template in the translation unit. | |||
2144 | // (C++98/03 doesn't have this wording; see DR226). | |||
2145 | S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ? | |||
2146 | diag::warn_cxx98_compat_template_parameter_default_in_function_template | |||
2147 | : diag::ext_template_parameter_default_in_function_template) | |||
2148 | << DefArgRange; | |||
2149 | return false; | |||
2150 | ||||
2151 | case Sema::TPC_ClassTemplateMember: | |||
2152 | // C++0x [temp.param]p9: | |||
2153 | // A default template-argument shall not be specified in the | |||
2154 | // template-parameter-lists of the definition of a member of a | |||
2155 | // class template that appears outside of the member's class. | |||
2156 | S.Diag(ParamLoc, diag::err_template_parameter_default_template_member) | |||
2157 | << DefArgRange; | |||
2158 | return true; | |||
2159 | ||||
2160 | case Sema::TPC_FriendClassTemplate: | |||
2161 | case Sema::TPC_FriendFunctionTemplate: | |||
2162 | // C++ [temp.param]p9: | |||
2163 | // A default template-argument shall not be specified in a | |||
2164 | // friend template declaration. | |||
2165 | S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template) | |||
2166 | << DefArgRange; | |||
2167 | return true; | |||
2168 | ||||
2169 | // FIXME: C++0x [temp.param]p9 allows default template-arguments | |||
2170 | // for friend function templates if there is only a single | |||
2171 | // declaration (and it is a definition). Strange! | |||
2172 | } | |||
2173 | ||||
2174 | llvm_unreachable("Invalid TemplateParamListContext!")::llvm::llvm_unreachable_internal("Invalid TemplateParamListContext!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 2174); | |||
2175 | } | |||
2176 | ||||
2177 | /// Check for unexpanded parameter packs within the template parameters | |||
2178 | /// of a template template parameter, recursively. | |||
2179 | static bool DiagnoseUnexpandedParameterPacks(Sema &S, | |||
2180 | TemplateTemplateParmDecl *TTP) { | |||
2181 | // A template template parameter which is a parameter pack is also a pack | |||
2182 | // expansion. | |||
2183 | if (TTP->isParameterPack()) | |||
2184 | return false; | |||
2185 | ||||
2186 | TemplateParameterList *Params = TTP->getTemplateParameters(); | |||
2187 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { | |||
2188 | NamedDecl *P = Params->getParam(I); | |||
2189 | if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) { | |||
2190 | if (!NTTP->isParameterPack() && | |||
2191 | S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(), | |||
2192 | NTTP->getTypeSourceInfo(), | |||
2193 | Sema::UPPC_NonTypeTemplateParameterType)) | |||
2194 | return true; | |||
2195 | ||||
2196 | continue; | |||
2197 | } | |||
2198 | ||||
2199 | if (TemplateTemplateParmDecl *InnerTTP | |||
2200 | = dyn_cast<TemplateTemplateParmDecl>(P)) | |||
2201 | if (DiagnoseUnexpandedParameterPacks(S, InnerTTP)) | |||
2202 | return true; | |||
2203 | } | |||
2204 | ||||
2205 | return false; | |||
2206 | } | |||
2207 | ||||
2208 | /// Checks the validity of a template parameter list, possibly | |||
2209 | /// considering the template parameter list from a previous | |||
2210 | /// declaration. | |||
2211 | /// | |||
2212 | /// If an "old" template parameter list is provided, it must be | |||
2213 | /// equivalent (per TemplateParameterListsAreEqual) to the "new" | |||
2214 | /// template parameter list. | |||
2215 | /// | |||
2216 | /// \param NewParams Template parameter list for a new template | |||
2217 | /// declaration. This template parameter list will be updated with any | |||
2218 | /// default arguments that are carried through from the previous | |||
2219 | /// template parameter list. | |||
2220 | /// | |||
2221 | /// \param OldParams If provided, template parameter list from a | |||
2222 | /// previous declaration of the same template. Default template | |||
2223 | /// arguments will be merged from the old template parameter list to | |||
2224 | /// the new template parameter list. | |||
2225 | /// | |||
2226 | /// \param TPC Describes the context in which we are checking the given | |||
2227 | /// template parameter list. | |||
2228 | /// | |||
2229 | /// \param SkipBody If we might have already made a prior merged definition | |||
2230 | /// of this template visible, the corresponding body-skipping information. | |||
2231 | /// Default argument redefinition is not an error when skipping such a body, | |||
2232 | /// because (under the ODR) we can assume the default arguments are the same | |||
2233 | /// as the prior merged definition. | |||
2234 | /// | |||
2235 | /// \returns true if an error occurred, false otherwise. | |||
2236 | bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams, | |||
2237 | TemplateParameterList *OldParams, | |||
2238 | TemplateParamListContext TPC, | |||
2239 | SkipBodyInfo *SkipBody) { | |||
2240 | bool Invalid = false; | |||
2241 | ||||
2242 | // C++ [temp.param]p10: | |||
2243 | // The set of default template-arguments available for use with a | |||
2244 | // template declaration or definition is obtained by merging the | |||
2245 | // default arguments from the definition (if in scope) and all | |||
2246 | // declarations in scope in the same way default function | |||
2247 | // arguments are (8.3.6). | |||
2248 | bool SawDefaultArgument = false; | |||
2249 | SourceLocation PreviousDefaultArgLoc; | |||
2250 | ||||
2251 | // Dummy initialization to avoid warnings. | |||
2252 | TemplateParameterList::iterator OldParam = NewParams->end(); | |||
2253 | if (OldParams) | |||
2254 | OldParam = OldParams->begin(); | |||
2255 | ||||
2256 | bool RemoveDefaultArguments = false; | |||
2257 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), | |||
2258 | NewParamEnd = NewParams->end(); | |||
2259 | NewParam != NewParamEnd; ++NewParam) { | |||
2260 | // Variables used to diagnose redundant default arguments | |||
2261 | bool RedundantDefaultArg = false; | |||
2262 | SourceLocation OldDefaultLoc; | |||
2263 | SourceLocation NewDefaultLoc; | |||
2264 | ||||
2265 | // Variable used to diagnose missing default arguments | |||
2266 | bool MissingDefaultArg = false; | |||
2267 | ||||
2268 | // Variable used to diagnose non-final parameter packs | |||
2269 | bool SawParameterPack = false; | |||
2270 | ||||
2271 | if (TemplateTypeParmDecl *NewTypeParm | |||
2272 | = dyn_cast<TemplateTypeParmDecl>(*NewParam)) { | |||
2273 | // Check the presence of a default argument here. | |||
2274 | if (NewTypeParm->hasDefaultArgument() && | |||
2275 | DiagnoseDefaultTemplateArgument(*this, TPC, | |||
2276 | NewTypeParm->getLocation(), | |||
2277 | NewTypeParm->getDefaultArgumentInfo()->getTypeLoc() | |||
2278 | .getSourceRange())) | |||
2279 | NewTypeParm->removeDefaultArgument(); | |||
2280 | ||||
2281 | // Merge default arguments for template type parameters. | |||
2282 | TemplateTypeParmDecl *OldTypeParm | |||
2283 | = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr; | |||
2284 | if (NewTypeParm->isParameterPack()) { | |||
2285 | assert(!NewTypeParm->hasDefaultArgument() &&((!NewTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!" ) ? static_cast<void> (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 2286, __PRETTY_FUNCTION__)) | |||
2286 | "Parameter packs can't have a default argument!")((!NewTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!" ) ? static_cast<void> (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 2286, __PRETTY_FUNCTION__)); | |||
2287 | SawParameterPack = true; | |||
2288 | } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) && | |||
2289 | NewTypeParm->hasDefaultArgument() && | |||
2290 | (!SkipBody || !SkipBody->ShouldSkip)) { | |||
2291 | OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc(); | |||
2292 | NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc(); | |||
2293 | SawDefaultArgument = true; | |||
2294 | RedundantDefaultArg = true; | |||
2295 | PreviousDefaultArgLoc = NewDefaultLoc; | |||
2296 | } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) { | |||
2297 | // Merge the default argument from the old declaration to the | |||
2298 | // new declaration. | |||
2299 | NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm); | |||
2300 | PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc(); | |||
2301 | } else if (NewTypeParm->hasDefaultArgument()) { | |||
2302 | SawDefaultArgument = true; | |||
2303 | PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc(); | |||
2304 | } else if (SawDefaultArgument) | |||
2305 | MissingDefaultArg = true; | |||
2306 | } else if (NonTypeTemplateParmDecl *NewNonTypeParm | |||
2307 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) { | |||
2308 | // Check for unexpanded parameter packs. | |||
2309 | if (!NewNonTypeParm->isParameterPack() && | |||
2310 | DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(), | |||
2311 | NewNonTypeParm->getTypeSourceInfo(), | |||
2312 | UPPC_NonTypeTemplateParameterType)) { | |||
2313 | Invalid = true; | |||
2314 | continue; | |||
2315 | } | |||
2316 | ||||
2317 | // Check the presence of a default argument here. | |||
2318 | if (NewNonTypeParm->hasDefaultArgument() && | |||
2319 | DiagnoseDefaultTemplateArgument(*this, TPC, | |||
2320 | NewNonTypeParm->getLocation(), | |||
2321 | NewNonTypeParm->getDefaultArgument()->getSourceRange())) { | |||
2322 | NewNonTypeParm->removeDefaultArgument(); | |||
2323 | } | |||
2324 | ||||
2325 | // Merge default arguments for non-type template parameters | |||
2326 | NonTypeTemplateParmDecl *OldNonTypeParm | |||
2327 | = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr; | |||
2328 | if (NewNonTypeParm->isParameterPack()) { | |||
2329 | assert(!NewNonTypeParm->hasDefaultArgument() &&((!NewNonTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!" ) ? static_cast<void> (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 2330, __PRETTY_FUNCTION__)) | |||
2330 | "Parameter packs can't have a default argument!")((!NewNonTypeParm->hasDefaultArgument() && "Parameter packs can't have a default argument!" ) ? static_cast<void> (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 2330, __PRETTY_FUNCTION__)); | |||
2331 | if (!NewNonTypeParm->isPackExpansion()) | |||
2332 | SawParameterPack = true; | |||
2333 | } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) && | |||
2334 | NewNonTypeParm->hasDefaultArgument() && | |||
2335 | (!SkipBody || !SkipBody->ShouldSkip)) { | |||
2336 | OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc(); | |||
2337 | NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc(); | |||
2338 | SawDefaultArgument = true; | |||
2339 | RedundantDefaultArg = true; | |||
2340 | PreviousDefaultArgLoc = NewDefaultLoc; | |||
2341 | } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) { | |||
2342 | // Merge the default argument from the old declaration to the | |||
2343 | // new declaration. | |||
2344 | NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm); | |||
2345 | PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc(); | |||
2346 | } else if (NewNonTypeParm->hasDefaultArgument()) { | |||
2347 | SawDefaultArgument = true; | |||
2348 | PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc(); | |||
2349 | } else if (SawDefaultArgument) | |||
2350 | MissingDefaultArg = true; | |||
2351 | } else { | |||
2352 | TemplateTemplateParmDecl *NewTemplateParm | |||
2353 | = cast<TemplateTemplateParmDecl>(*NewParam); | |||
2354 | ||||
2355 | // Check for unexpanded parameter packs, recursively. | |||
2356 | if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) { | |||
2357 | Invalid = true; | |||
2358 | continue; | |||
2359 | } | |||
2360 | ||||
2361 | // Check the presence of a default argument here. | |||
2362 | if (NewTemplateParm->hasDefaultArgument() && | |||
2363 | DiagnoseDefaultTemplateArgument(*this, TPC, | |||
2364 | NewTemplateParm->getLocation(), | |||
2365 | NewTemplateParm->getDefaultArgument().getSourceRange())) | |||
2366 | NewTemplateParm->removeDefaultArgument(); | |||
2367 | ||||
2368 | // Merge default arguments for template template parameters | |||
2369 | TemplateTemplateParmDecl *OldTemplateParm | |||
2370 | = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr; | |||
2371 | if (NewTemplateParm->isParameterPack()) { | |||
2372 | assert(!NewTemplateParm->hasDefaultArgument() &&((!NewTemplateParm->hasDefaultArgument() && "Parameter packs can't have a default argument!" ) ? static_cast<void> (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 2373, __PRETTY_FUNCTION__)) | |||
2373 | "Parameter packs can't have a default argument!")((!NewTemplateParm->hasDefaultArgument() && "Parameter packs can't have a default argument!" ) ? static_cast<void> (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 2373, __PRETTY_FUNCTION__)); | |||
2374 | if (!NewTemplateParm->isPackExpansion()) | |||
2375 | SawParameterPack = true; | |||
2376 | } else if (OldTemplateParm && | |||
2377 | hasVisibleDefaultArgument(OldTemplateParm) && | |||
2378 | NewTemplateParm->hasDefaultArgument() && | |||
2379 | (!SkipBody || !SkipBody->ShouldSkip)) { | |||
2380 | OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation(); | |||
2381 | NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation(); | |||
2382 | SawDefaultArgument = true; | |||
2383 | RedundantDefaultArg = true; | |||
2384 | PreviousDefaultArgLoc = NewDefaultLoc; | |||
2385 | } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) { | |||
2386 | // Merge the default argument from the old declaration to the | |||
2387 | // new declaration. | |||
2388 | NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm); | |||
2389 | PreviousDefaultArgLoc | |||
2390 | = OldTemplateParm->getDefaultArgument().getLocation(); | |||
2391 | } else if (NewTemplateParm->hasDefaultArgument()) { | |||
2392 | SawDefaultArgument = true; | |||
2393 | PreviousDefaultArgLoc | |||
2394 | = NewTemplateParm->getDefaultArgument().getLocation(); | |||
2395 | } else if (SawDefaultArgument) | |||
2396 | MissingDefaultArg = true; | |||
2397 | } | |||
2398 | ||||
2399 | // C++11 [temp.param]p11: | |||
2400 | // If a template parameter of a primary class template or alias template | |||
2401 | // is a template parameter pack, it shall be the last template parameter. | |||
2402 | if (SawParameterPack && (NewParam + 1) != NewParamEnd && | |||
2403 | (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate || | |||
2404 | TPC == TPC_TypeAliasTemplate)) { | |||
2405 | Diag((*NewParam)->getLocation(), | |||
2406 | diag::err_template_param_pack_must_be_last_template_parameter); | |||
2407 | Invalid = true; | |||
2408 | } | |||
2409 | ||||
2410 | if (RedundantDefaultArg) { | |||
2411 | // C++ [temp.param]p12: | |||
2412 | // A template-parameter shall not be given default arguments | |||
2413 | // by two different declarations in the same scope. | |||
2414 | Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition); | |||
2415 | Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg); | |||
2416 | Invalid = true; | |||
2417 | } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) { | |||
2418 | // C++ [temp.param]p11: | |||
2419 | // If a template-parameter of a class template has a default | |||
2420 | // template-argument, each subsequent template-parameter shall either | |||
2421 | // have a default template-argument supplied or be a template parameter | |||
2422 | // pack. | |||
2423 | Diag((*NewParam)->getLocation(), | |||
2424 | diag::err_template_param_default_arg_missing); | |||
2425 | Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg); | |||
2426 | Invalid = true; | |||
2427 | RemoveDefaultArguments = true; | |||
2428 | } | |||
2429 | ||||
2430 | // If we have an old template parameter list that we're merging | |||
2431 | // in, move on to the next parameter. | |||
2432 | if (OldParams) | |||
2433 | ++OldParam; | |||
2434 | } | |||
2435 | ||||
2436 | // We were missing some default arguments at the end of the list, so remove | |||
2437 | // all of the default arguments. | |||
2438 | if (RemoveDefaultArguments) { | |||
2439 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), | |||
2440 | NewParamEnd = NewParams->end(); | |||
2441 | NewParam != NewParamEnd; ++NewParam) { | |||
2442 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam)) | |||
2443 | TTP->removeDefaultArgument(); | |||
2444 | else if (NonTypeTemplateParmDecl *NTTP | |||
2445 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) | |||
2446 | NTTP->removeDefaultArgument(); | |||
2447 | else | |||
2448 | cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument(); | |||
2449 | } | |||
2450 | } | |||
2451 | ||||
2452 | return Invalid; | |||
2453 | } | |||
2454 | ||||
2455 | namespace { | |||
2456 | ||||
2457 | /// A class which looks for a use of a certain level of template | |||
2458 | /// parameter. | |||
2459 | struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> { | |||
2460 | typedef RecursiveASTVisitor<DependencyChecker> super; | |||
2461 | ||||
2462 | unsigned Depth; | |||
2463 | ||||
2464 | // Whether we're looking for a use of a template parameter that makes the | |||
2465 | // overall construct type-dependent / a dependent type. This is strictly | |||
2466 | // best-effort for now; we may fail to match at all for a dependent type | |||
2467 | // in some cases if this is set. | |||
2468 | bool IgnoreNonTypeDependent; | |||
2469 | ||||
2470 | bool Match; | |||
2471 | SourceLocation MatchLoc; | |||
2472 | ||||
2473 | DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent) | |||
2474 | : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent), | |||
2475 | Match(false) {} | |||
2476 | ||||
2477 | DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent) | |||
2478 | : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) { | |||
2479 | NamedDecl *ND = Params->getParam(0); | |||
2480 | if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) { | |||
2481 | Depth = PD->getDepth(); | |||
2482 | } else if (NonTypeTemplateParmDecl *PD = | |||
2483 | dyn_cast<NonTypeTemplateParmDecl>(ND)) { | |||
2484 | Depth = PD->getDepth(); | |||
2485 | } else { | |||
2486 | Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth(); | |||
2487 | } | |||
2488 | } | |||
2489 | ||||
2490 | bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) { | |||
2491 | if (ParmDepth >= Depth) { | |||
2492 | Match = true; | |||
2493 | MatchLoc = Loc; | |||
2494 | return true; | |||
2495 | } | |||
2496 | return false; | |||
2497 | } | |||
2498 | ||||
2499 | bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) { | |||
2500 | // Prune out non-type-dependent expressions if requested. This can | |||
2501 | // sometimes result in us failing to find a template parameter reference | |||
2502 | // (if a value-dependent expression creates a dependent type), but this | |||
2503 | // mode is best-effort only. | |||
2504 | if (auto *E = dyn_cast_or_null<Expr>(S)) | |||
2505 | if (IgnoreNonTypeDependent && !E->isTypeDependent()) | |||
2506 | return true; | |||
2507 | return super::TraverseStmt(S, Q); | |||
2508 | } | |||
2509 | ||||
2510 | bool TraverseTypeLoc(TypeLoc TL) { | |||
2511 | if (IgnoreNonTypeDependent && !TL.isNull() && | |||
2512 | !TL.getType()->isDependentType()) | |||
2513 | return true; | |||
2514 | return super::TraverseTypeLoc(TL); | |||
2515 | } | |||
2516 | ||||
2517 | bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) { | |||
2518 | return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc()); | |||
2519 | } | |||
2520 | ||||
2521 | bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) { | |||
2522 | // For a best-effort search, keep looking until we find a location. | |||
2523 | return IgnoreNonTypeDependent || !Matches(T->getDepth()); | |||
2524 | } | |||
2525 | ||||
2526 | bool TraverseTemplateName(TemplateName N) { | |||
2527 | if (TemplateTemplateParmDecl *PD = | |||
2528 | dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl())) | |||
2529 | if (Matches(PD->getDepth())) | |||
2530 | return false; | |||
2531 | return super::TraverseTemplateName(N); | |||
2532 | } | |||
2533 | ||||
2534 | bool VisitDeclRefExpr(DeclRefExpr *E) { | |||
2535 | if (NonTypeTemplateParmDecl *PD = | |||
2536 | dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) | |||
2537 | if (Matches(PD->getDepth(), E->getExprLoc())) | |||
2538 | return false; | |||
2539 | return super::VisitDeclRefExpr(E); | |||
2540 | } | |||
2541 | ||||
2542 | bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) { | |||
2543 | return TraverseType(T->getReplacementType()); | |||
2544 | } | |||
2545 | ||||
2546 | bool | |||
2547 | VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) { | |||
2548 | return TraverseTemplateArgument(T->getArgumentPack()); | |||
2549 | } | |||
2550 | ||||
2551 | bool TraverseInjectedClassNameType(const InjectedClassNameType *T) { | |||
2552 | return TraverseType(T->getInjectedSpecializationType()); | |||
2553 | } | |||
2554 | }; | |||
2555 | } // end anonymous namespace | |||
2556 | ||||
2557 | /// Determines whether a given type depends on the given parameter | |||
2558 | /// list. | |||
2559 | static bool | |||
2560 | DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) { | |||
2561 | DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false); | |||
2562 | Checker.TraverseType(T); | |||
2563 | return Checker.Match; | |||
2564 | } | |||
2565 | ||||
2566 | // Find the source range corresponding to the named type in the given | |||
2567 | // nested-name-specifier, if any. | |||
2568 | static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context, | |||
2569 | QualType T, | |||
2570 | const CXXScopeSpec &SS) { | |||
2571 | NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data()); | |||
2572 | while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) { | |||
2573 | if (const Type *CurType = NNS->getAsType()) { | |||
2574 | if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0))) | |||
2575 | return NNSLoc.getTypeLoc().getSourceRange(); | |||
2576 | } else | |||
2577 | break; | |||
2578 | ||||
2579 | NNSLoc = NNSLoc.getPrefix(); | |||
2580 | } | |||
2581 | ||||
2582 | return SourceRange(); | |||
2583 | } | |||
2584 | ||||
2585 | /// Match the given template parameter lists to the given scope | |||
2586 | /// specifier, returning the template parameter list that applies to the | |||
2587 | /// name. | |||
2588 | /// | |||
2589 | /// \param DeclStartLoc the start of the declaration that has a scope | |||
2590 | /// specifier or a template parameter list. | |||
2591 | /// | |||
2592 | /// \param DeclLoc The location of the declaration itself. | |||
2593 | /// | |||
2594 | /// \param SS the scope specifier that will be matched to the given template | |||
2595 | /// parameter lists. This scope specifier precedes a qualified name that is | |||
2596 | /// being declared. | |||
2597 | /// | |||
2598 | /// \param TemplateId The template-id following the scope specifier, if there | |||
2599 | /// is one. Used to check for a missing 'template<>'. | |||
2600 | /// | |||
2601 | /// \param ParamLists the template parameter lists, from the outermost to the | |||
2602 | /// innermost template parameter lists. | |||
2603 | /// | |||
2604 | /// \param IsFriend Whether to apply the slightly different rules for | |||
2605 | /// matching template parameters to scope specifiers in friend | |||
2606 | /// declarations. | |||
2607 | /// | |||
2608 | /// \param IsMemberSpecialization will be set true if the scope specifier | |||
2609 | /// denotes a fully-specialized type, and therefore this is a declaration of | |||
2610 | /// a member specialization. | |||
2611 | /// | |||
2612 | /// \returns the template parameter list, if any, that corresponds to the | |||
2613 | /// name that is preceded by the scope specifier @p SS. This template | |||
2614 | /// parameter list may have template parameters (if we're declaring a | |||
2615 | /// template) or may have no template parameters (if we're declaring a | |||
2616 | /// template specialization), or may be NULL (if what we're declaring isn't | |||
2617 | /// itself a template). | |||
2618 | TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier( | |||
2619 | SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS, | |||
2620 | TemplateIdAnnotation *TemplateId, | |||
2621 | ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend, | |||
2622 | bool &IsMemberSpecialization, bool &Invalid) { | |||
2623 | IsMemberSpecialization = false; | |||
2624 | Invalid = false; | |||
2625 | ||||
2626 | // The sequence of nested types to which we will match up the template | |||
2627 | // parameter lists. We first build this list by starting with the type named | |||
2628 | // by the nested-name-specifier and walking out until we run out of types. | |||
2629 | SmallVector<QualType, 4> NestedTypes; | |||
2630 | QualType T; | |||
2631 | if (SS.getScopeRep()) { | |||
2632 | if (CXXRecordDecl *Record | |||
2633 | = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true))) | |||
2634 | T = Context.getTypeDeclType(Record); | |||
2635 | else | |||
2636 | T = QualType(SS.getScopeRep()->getAsType(), 0); | |||
2637 | } | |||
2638 | ||||
2639 | // If we found an explicit specialization that prevents us from needing | |||
2640 | // 'template<>' headers, this will be set to the location of that | |||
2641 | // explicit specialization. | |||
2642 | SourceLocation ExplicitSpecLoc; | |||
2643 | ||||
2644 | while (!T.isNull()) { | |||
2645 | NestedTypes.push_back(T); | |||
2646 | ||||
2647 | // Retrieve the parent of a record type. | |||
2648 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { | |||
2649 | // If this type is an explicit specialization, we're done. | |||
2650 | if (ClassTemplateSpecializationDecl *Spec | |||
2651 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { | |||
2652 | if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) && | |||
2653 | Spec->getSpecializationKind() == TSK_ExplicitSpecialization) { | |||
2654 | ExplicitSpecLoc = Spec->getLocation(); | |||
2655 | break; | |||
2656 | } | |||
2657 | } else if (Record->getTemplateSpecializationKind() | |||
2658 | == TSK_ExplicitSpecialization) { | |||
2659 | ExplicitSpecLoc = Record->getLocation(); | |||
2660 | break; | |||
2661 | } | |||
2662 | ||||
2663 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent())) | |||
2664 | T = Context.getTypeDeclType(Parent); | |||
2665 | else | |||
2666 | T = QualType(); | |||
2667 | continue; | |||
2668 | } | |||
2669 | ||||
2670 | if (const TemplateSpecializationType *TST | |||
2671 | = T->getAs<TemplateSpecializationType>()) { | |||
2672 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { | |||
2673 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext())) | |||
2674 | T = Context.getTypeDeclType(Parent); | |||
2675 | else | |||
2676 | T = QualType(); | |||
2677 | continue; | |||
2678 | } | |||
2679 | } | |||
2680 | ||||
2681 | // Look one step prior in a dependent template specialization type. | |||
2682 | if (const DependentTemplateSpecializationType *DependentTST | |||
2683 | = T->getAs<DependentTemplateSpecializationType>()) { | |||
2684 | if (NestedNameSpecifier *NNS = DependentTST->getQualifier()) | |||
2685 | T = QualType(NNS->getAsType(), 0); | |||
2686 | else | |||
2687 | T = QualType(); | |||
2688 | continue; | |||
2689 | } | |||
2690 | ||||
2691 | // Look one step prior in a dependent name type. | |||
2692 | if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){ | |||
2693 | if (NestedNameSpecifier *NNS = DependentName->getQualifier()) | |||
2694 | T = QualType(NNS->getAsType(), 0); | |||
2695 | else | |||
2696 | T = QualType(); | |||
2697 | continue; | |||
2698 | } | |||
2699 | ||||
2700 | // Retrieve the parent of an enumeration type. | |||
2701 | if (const EnumType *EnumT = T->getAs<EnumType>()) { | |||
2702 | // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization | |||
2703 | // check here. | |||
2704 | EnumDecl *Enum = EnumT->getDecl(); | |||
2705 | ||||
2706 | // Get to the parent type. | |||
2707 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent())) | |||
2708 | T = Context.getTypeDeclType(Parent); | |||
2709 | else | |||
2710 | T = QualType(); | |||
2711 | continue; | |||
2712 | } | |||
2713 | ||||
2714 | T = QualType(); | |||
2715 | } | |||
2716 | // Reverse the nested types list, since we want to traverse from the outermost | |||
2717 | // to the innermost while checking template-parameter-lists. | |||
2718 | std::reverse(NestedTypes.begin(), NestedTypes.end()); | |||
2719 | ||||
2720 | // C++0x [temp.expl.spec]p17: | |||
2721 | // A member or a member template may be nested within many | |||
2722 | // enclosing class templates. In an explicit specialization for | |||
2723 | // such a member, the member declaration shall be preceded by a | |||
2724 | // template<> for each enclosing class template that is | |||
2725 | // explicitly specialized. | |||
2726 | bool SawNonEmptyTemplateParameterList = false; | |||
2727 | ||||
2728 | auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) { | |||
2729 | if (SawNonEmptyTemplateParameterList) { | |||
2730 | Diag(DeclLoc, diag::err_specialize_member_of_template) | |||
2731 | << !Recovery << Range; | |||
2732 | Invalid = true; | |||
2733 | IsMemberSpecialization = false; | |||
2734 | return true; | |||
2735 | } | |||
2736 | ||||
2737 | return false; | |||
2738 | }; | |||
2739 | ||||
2740 | auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) { | |||
2741 | // Check that we can have an explicit specialization here. | |||
2742 | if (CheckExplicitSpecialization(Range, true)) | |||
2743 | return true; | |||
2744 | ||||
2745 | // We don't have a template header, but we should. | |||
2746 | SourceLocation ExpectedTemplateLoc; | |||
2747 | if (!ParamLists.empty()) | |||
2748 | ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc(); | |||
2749 | else | |||
2750 | ExpectedTemplateLoc = DeclStartLoc; | |||
2751 | ||||
2752 | Diag(DeclLoc, diag::err_template_spec_needs_header) | |||
2753 | << Range | |||
2754 | << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> "); | |||
2755 | return false; | |||
2756 | }; | |||
2757 | ||||
2758 | unsigned ParamIdx = 0; | |||
2759 | for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes; | |||
2760 | ++TypeIdx) { | |||
2761 | T = NestedTypes[TypeIdx]; | |||
2762 | ||||
2763 | // Whether we expect a 'template<>' header. | |||
2764 | bool NeedEmptyTemplateHeader = false; | |||
2765 | ||||
2766 | // Whether we expect a template header with parameters. | |||
2767 | bool NeedNonemptyTemplateHeader = false; | |||
2768 | ||||
2769 | // For a dependent type, the set of template parameters that we | |||
2770 | // expect to see. | |||
2771 | TemplateParameterList *ExpectedTemplateParams = nullptr; | |||
2772 | ||||
2773 | // C++0x [temp.expl.spec]p15: | |||
2774 | // A member or a member template may be nested within many enclosing | |||
2775 | // class templates. In an explicit specialization for such a member, the | |||
2776 | // member declaration shall be preceded by a template<> for each | |||
2777 | // enclosing class template that is explicitly specialized. | |||
2778 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { | |||
2779 | if (ClassTemplatePartialSpecializationDecl *Partial | |||
2780 | = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { | |||
2781 | ExpectedTemplateParams = Partial->getTemplateParameters(); | |||
2782 | NeedNonemptyTemplateHeader = true; | |||
2783 | } else if (Record->isDependentType()) { | |||
2784 | if (Record->getDescribedClassTemplate()) { | |||
2785 | ExpectedTemplateParams = Record->getDescribedClassTemplate() | |||
2786 | ->getTemplateParameters(); | |||
2787 | NeedNonemptyTemplateHeader = true; | |||
2788 | } | |||
2789 | } else if (ClassTemplateSpecializationDecl *Spec | |||
2790 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { | |||
2791 | // C++0x [temp.expl.spec]p4: | |||
2792 | // Members of an explicitly specialized class template are defined | |||
2793 | // in the same manner as members of normal classes, and not using | |||
2794 | // the template<> syntax. | |||
2795 | if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization) | |||
2796 | NeedEmptyTemplateHeader = true; | |||
2797 | else | |||
2798 | continue; | |||
2799 | } else if (Record->getTemplateSpecializationKind()) { | |||
2800 | if (Record->getTemplateSpecializationKind() | |||
2801 | != TSK_ExplicitSpecialization && | |||
2802 | TypeIdx == NumTypes - 1) | |||
2803 | IsMemberSpecialization = true; | |||
2804 | ||||
2805 | continue; | |||
2806 | } | |||
2807 | } else if (const TemplateSpecializationType *TST | |||
2808 | = T->getAs<TemplateSpecializationType>()) { | |||
2809 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { | |||
2810 | ExpectedTemplateParams = Template->getTemplateParameters(); | |||
2811 | NeedNonemptyTemplateHeader = true; | |||
2812 | } | |||
2813 | } else if (T->getAs<DependentTemplateSpecializationType>()) { | |||
2814 | // FIXME: We actually could/should check the template arguments here | |||
2815 | // against the corresponding template parameter list. | |||
2816 | NeedNonemptyTemplateHeader = false; | |||
2817 | } | |||
2818 | ||||
2819 | // C++ [temp.expl.spec]p16: | |||
2820 | // In an explicit specialization declaration for a member of a class | |||
2821 | // template or a member template that ap- pears in namespace scope, the | |||
2822 | // member template and some of its enclosing class templates may remain | |||
2823 | // unspecialized, except that the declaration shall not explicitly | |||
2824 | // specialize a class member template if its en- closing class templates | |||
2825 | // are not explicitly specialized as well. | |||
2826 | if (ParamIdx < ParamLists.size()) { | |||
2827 | if (ParamLists[ParamIdx]->size() == 0) { | |||
2828 | if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), | |||
2829 | false)) | |||
2830 | return nullptr; | |||
2831 | } else | |||
2832 | SawNonEmptyTemplateParameterList = true; | |||
2833 | } | |||
2834 | ||||
2835 | if (NeedEmptyTemplateHeader) { | |||
2836 | // If we're on the last of the types, and we need a 'template<>' header | |||
2837 | // here, then it's a member specialization. | |||
2838 | if (TypeIdx == NumTypes - 1) | |||
2839 | IsMemberSpecialization = true; | |||
2840 | ||||
2841 | if (ParamIdx < ParamLists.size()) { | |||
2842 | if (ParamLists[ParamIdx]->size() > 0) { | |||
2843 | // The header has template parameters when it shouldn't. Complain. | |||
2844 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), | |||
2845 | diag::err_template_param_list_matches_nontemplate) | |||
2846 | << T | |||
2847 | << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(), | |||
2848 | ParamLists[ParamIdx]->getRAngleLoc()) | |||
2849 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); | |||
2850 | Invalid = true; | |||
2851 | return nullptr; | |||
2852 | } | |||
2853 | ||||
2854 | // Consume this template header. | |||
2855 | ++ParamIdx; | |||
2856 | continue; | |||
2857 | } | |||
2858 | ||||
2859 | if (!IsFriend) | |||
2860 | if (DiagnoseMissingExplicitSpecialization( | |||
2861 | getRangeOfTypeInNestedNameSpecifier(Context, T, SS))) | |||
2862 | return nullptr; | |||
2863 | ||||
2864 | continue; | |||
2865 | } | |||
2866 | ||||
2867 | if (NeedNonemptyTemplateHeader) { | |||
2868 | // In friend declarations we can have template-ids which don't | |||
2869 | // depend on the corresponding template parameter lists. But | |||
2870 | // assume that empty parameter lists are supposed to match this | |||
2871 | // template-id. | |||
2872 | if (IsFriend && T->isDependentType()) { | |||
2873 | if (ParamIdx < ParamLists.size() && | |||
2874 | DependsOnTemplateParameters(T, ParamLists[ParamIdx])) | |||
2875 | ExpectedTemplateParams = nullptr; | |||
2876 | else | |||
2877 | continue; | |||
2878 | } | |||
2879 | ||||
2880 | if (ParamIdx < ParamLists.size()) { | |||
2881 | // Check the template parameter list, if we can. | |||
2882 | if (ExpectedTemplateParams && | |||
2883 | !TemplateParameterListsAreEqual(ParamLists[ParamIdx], | |||
2884 | ExpectedTemplateParams, | |||
2885 | true, TPL_TemplateMatch)) | |||
2886 | Invalid = true; | |||
2887 | ||||
2888 | if (!Invalid && | |||
2889 | CheckTemplateParameterList(ParamLists[ParamIdx], nullptr, | |||
2890 | TPC_ClassTemplateMember)) | |||
2891 | Invalid = true; | |||
2892 | ||||
2893 | ++ParamIdx; | |||
2894 | continue; | |||
2895 | } | |||
2896 | ||||
2897 | Diag(DeclLoc, diag::err_template_spec_needs_template_parameters) | |||
2898 | << T | |||
2899 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); | |||
2900 | Invalid = true; | |||
2901 | continue; | |||
2902 | } | |||
2903 | } | |||
2904 | ||||
2905 | // If there were at least as many template-ids as there were template | |||
2906 | // parameter lists, then there are no template parameter lists remaining for | |||
2907 | // the declaration itself. | |||
2908 | if (ParamIdx >= ParamLists.size()) { | |||
2909 | if (TemplateId && !IsFriend) { | |||
2910 | // We don't have a template header for the declaration itself, but we | |||
2911 | // should. | |||
2912 | DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc, | |||
2913 | TemplateId->RAngleLoc)); | |||
2914 | ||||
2915 | // Fabricate an empty template parameter list for the invented header. | |||
2916 | return TemplateParameterList::Create(Context, SourceLocation(), | |||
2917 | SourceLocation(), None, | |||
2918 | SourceLocation(), nullptr); | |||
2919 | } | |||
2920 | ||||
2921 | return nullptr; | |||
2922 | } | |||
2923 | ||||
2924 | // If there were too many template parameter lists, complain about that now. | |||
2925 | if (ParamIdx < ParamLists.size() - 1) { | |||
2926 | bool HasAnyExplicitSpecHeader = false; | |||
2927 | bool AllExplicitSpecHeaders = true; | |||
2928 | for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) { | |||
2929 | if (ParamLists[I]->size() == 0) | |||
2930 | HasAnyExplicitSpecHeader = true; | |||
2931 | else | |||
2932 | AllExplicitSpecHeaders = false; | |||
2933 | } | |||
2934 | ||||
2935 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), | |||
2936 | AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers | |||
2937 | : diag::err_template_spec_extra_headers) | |||
2938 | << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(), | |||
2939 | ParamLists[ParamLists.size() - 2]->getRAngleLoc()); | |||
2940 | ||||
2941 | // If there was a specialization somewhere, such that 'template<>' is | |||
2942 | // not required, and there were any 'template<>' headers, note where the | |||
2943 | // specialization occurred. | |||
2944 | if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader) | |||
2945 | Diag(ExplicitSpecLoc, | |||
2946 | diag::note_explicit_template_spec_does_not_need_header) | |||
2947 | << NestedTypes.back(); | |||
2948 | ||||
2949 | // We have a template parameter list with no corresponding scope, which | |||
2950 | // means that the resulting template declaration can't be instantiated | |||
2951 | // properly (we'll end up with dependent nodes when we shouldn't). | |||
2952 | if (!AllExplicitSpecHeaders) | |||
2953 | Invalid = true; | |||
2954 | } | |||
2955 | ||||
2956 | // C++ [temp.expl.spec]p16: | |||
2957 | // In an explicit specialization declaration for a member of a class | |||
2958 | // template or a member template that ap- pears in namespace scope, the | |||
2959 | // member template and some of its enclosing class templates may remain | |||
2960 | // unspecialized, except that the declaration shall not explicitly | |||
2961 | // specialize a class member template if its en- closing class templates | |||
2962 | // are not explicitly specialized as well. | |||
2963 | if (ParamLists.back()->size() == 0 && | |||
2964 | CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), | |||
2965 | false)) | |||
2966 | return nullptr; | |||
2967 | ||||
2968 | // Return the last template parameter list, which corresponds to the | |||
2969 | // entity being declared. | |||
2970 | return ParamLists.back(); | |||
2971 | } | |||
2972 | ||||
2973 | void Sema::NoteAllFoundTemplates(TemplateName Name) { | |||
2974 | if (TemplateDecl *Template = Name.getAsTemplateDecl()) { | |||
2975 | Diag(Template->getLocation(), diag::note_template_declared_here) | |||
2976 | << (isa<FunctionTemplateDecl>(Template) | |||
2977 | ? 0 | |||
2978 | : isa<ClassTemplateDecl>(Template) | |||
2979 | ? 1 | |||
2980 | : isa<VarTemplateDecl>(Template) | |||
2981 | ? 2 | |||
2982 | : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4) | |||
2983 | << Template->getDeclName(); | |||
2984 | return; | |||
2985 | } | |||
2986 | ||||
2987 | if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) { | |||
2988 | for (OverloadedTemplateStorage::iterator I = OST->begin(), | |||
2989 | IEnd = OST->end(); | |||
2990 | I != IEnd; ++I) | |||
2991 | Diag((*I)->getLocation(), diag::note_template_declared_here) | |||
2992 | << 0 << (*I)->getDeclName(); | |||
2993 | ||||
2994 | return; | |||
2995 | } | |||
2996 | } | |||
2997 | ||||
2998 | static QualType | |||
2999 | checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD, | |||
3000 | const SmallVectorImpl<TemplateArgument> &Converted, | |||
3001 | SourceLocation TemplateLoc, | |||
3002 | TemplateArgumentListInfo &TemplateArgs) { | |||
3003 | ASTContext &Context = SemaRef.getASTContext(); | |||
3004 | switch (BTD->getBuiltinTemplateKind()) { | |||
3005 | case BTK__make_integer_seq: { | |||
3006 | // Specializations of __make_integer_seq<S, T, N> are treated like | |||
3007 | // S<T, 0, ..., N-1>. | |||
3008 | ||||
3009 | // C++14 [inteseq.intseq]p1: | |||
3010 | // T shall be an integer type. | |||
3011 | if (!Converted[1].getAsType()->isIntegralType(Context)) { | |||
3012 | SemaRef.Diag(TemplateArgs[1].getLocation(), | |||
3013 | diag::err_integer_sequence_integral_element_type); | |||
3014 | return QualType(); | |||
3015 | } | |||
3016 | ||||
3017 | // C++14 [inteseq.make]p1: | |||
3018 | // If N is negative the program is ill-formed. | |||
3019 | TemplateArgument NumArgsArg = Converted[2]; | |||
3020 | llvm::APSInt NumArgs = NumArgsArg.getAsIntegral(); | |||
3021 | if (NumArgs < 0) { | |||
3022 | SemaRef.Diag(TemplateArgs[2].getLocation(), | |||
3023 | diag::err_integer_sequence_negative_length); | |||
3024 | return QualType(); | |||
3025 | } | |||
3026 | ||||
3027 | QualType ArgTy = NumArgsArg.getIntegralType(); | |||
3028 | TemplateArgumentListInfo SyntheticTemplateArgs; | |||
3029 | // The type argument gets reused as the first template argument in the | |||
3030 | // synthetic template argument list. | |||
3031 | SyntheticTemplateArgs.addArgument(TemplateArgs[1]); | |||
3032 | // Expand N into 0 ... N-1. | |||
3033 | for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned()); | |||
3034 | I < NumArgs; ++I) { | |||
3035 | TemplateArgument TA(Context, I, ArgTy); | |||
3036 | SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc( | |||
3037 | TA, ArgTy, TemplateArgs[2].getLocation())); | |||
3038 | } | |||
3039 | // The first template argument will be reused as the template decl that | |||
3040 | // our synthetic template arguments will be applied to. | |||
3041 | return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(), | |||
3042 | TemplateLoc, SyntheticTemplateArgs); | |||
3043 | } | |||
3044 | ||||
3045 | case BTK__type_pack_element: | |||
3046 | // Specializations of | |||
3047 | // __type_pack_element<Index, T_1, ..., T_N> | |||
3048 | // are treated like T_Index. | |||
3049 | assert(Converted.size() == 2 &&((Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack" ) ? static_cast<void> (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3050, __PRETTY_FUNCTION__)) | |||
3050 | "__type_pack_element should be given an index and a parameter pack")((Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack" ) ? static_cast<void> (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3050, __PRETTY_FUNCTION__)); | |||
3051 | ||||
3052 | // If the Index is out of bounds, the program is ill-formed. | |||
3053 | TemplateArgument IndexArg = Converted[0], Ts = Converted[1]; | |||
3054 | llvm::APSInt Index = IndexArg.getAsIntegral(); | |||
3055 | assert(Index >= 0 && "the index used with __type_pack_element should be of "((Index >= 0 && "the index used with __type_pack_element should be of " "type std::size_t, and hence be non-negative") ? static_cast <void> (0) : __assert_fail ("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3056, __PRETTY_FUNCTION__)) | |||
3056 | "type std::size_t, and hence be non-negative")((Index >= 0 && "the index used with __type_pack_element should be of " "type std::size_t, and hence be non-negative") ? static_cast <void> (0) : __assert_fail ("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3056, __PRETTY_FUNCTION__)); | |||
3057 | if (Index >= Ts.pack_size()) { | |||
3058 | SemaRef.Diag(TemplateArgs[0].getLocation(), | |||
3059 | diag::err_type_pack_element_out_of_bounds); | |||
3060 | return QualType(); | |||
3061 | } | |||
3062 | ||||
3063 | // We simply return the type at index `Index`. | |||
3064 | auto Nth = std::next(Ts.pack_begin(), Index.getExtValue()); | |||
3065 | return Nth->getAsType(); | |||
3066 | } | |||
3067 | llvm_unreachable("unexpected BuiltinTemplateDecl!")::llvm::llvm_unreachable_internal("unexpected BuiltinTemplateDecl!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3067); | |||
3068 | } | |||
3069 | ||||
3070 | /// Determine whether this alias template is "enable_if_t". | |||
3071 | static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) { | |||
3072 | return AliasTemplate->getName().equals("enable_if_t"); | |||
3073 | } | |||
3074 | ||||
3075 | /// Collect all of the separable terms in the given condition, which | |||
3076 | /// might be a conjunction. | |||
3077 | /// | |||
3078 | /// FIXME: The right answer is to convert the logical expression into | |||
3079 | /// disjunctive normal form, so we can find the first failed term | |||
3080 | /// within each possible clause. | |||
3081 | static void collectConjunctionTerms(Expr *Clause, | |||
3082 | SmallVectorImpl<Expr *> &Terms) { | |||
3083 | if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) { | |||
3084 | if (BinOp->getOpcode() == BO_LAnd) { | |||
3085 | collectConjunctionTerms(BinOp->getLHS(), Terms); | |||
3086 | collectConjunctionTerms(BinOp->getRHS(), Terms); | |||
3087 | } | |||
3088 | ||||
3089 | return; | |||
3090 | } | |||
3091 | ||||
3092 | Terms.push_back(Clause); | |||
3093 | } | |||
3094 | ||||
3095 | // The ranges-v3 library uses an odd pattern of a top-level "||" with | |||
3096 | // a left-hand side that is value-dependent but never true. Identify | |||
3097 | // the idiom and ignore that term. | |||
3098 | static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) { | |||
3099 | // Top-level '||'. | |||
3100 | auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts()); | |||
3101 | if (!BinOp) return Cond; | |||
3102 | ||||
3103 | if (BinOp->getOpcode() != BO_LOr) return Cond; | |||
3104 | ||||
3105 | // With an inner '==' that has a literal on the right-hand side. | |||
3106 | Expr *LHS = BinOp->getLHS(); | |||
3107 | auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts()); | |||
3108 | if (!InnerBinOp) return Cond; | |||
3109 | ||||
3110 | if (InnerBinOp->getOpcode() != BO_EQ || | |||
3111 | !isa<IntegerLiteral>(InnerBinOp->getRHS())) | |||
3112 | return Cond; | |||
3113 | ||||
3114 | // If the inner binary operation came from a macro expansion named | |||
3115 | // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side | |||
3116 | // of the '||', which is the real, user-provided condition. | |||
3117 | SourceLocation Loc = InnerBinOp->getExprLoc(); | |||
3118 | if (!Loc.isMacroID()) return Cond; | |||
3119 | ||||
3120 | StringRef MacroName = PP.getImmediateMacroName(Loc); | |||
3121 | if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_") | |||
3122 | return BinOp->getRHS(); | |||
3123 | ||||
3124 | return Cond; | |||
3125 | } | |||
3126 | ||||
3127 | namespace { | |||
3128 | ||||
3129 | // A PrinterHelper that prints more helpful diagnostics for some sub-expressions | |||
3130 | // within failing boolean expression, such as substituting template parameters | |||
3131 | // for actual types. | |||
3132 | class FailedBooleanConditionPrinterHelper : public PrinterHelper { | |||
3133 | public: | |||
3134 | explicit FailedBooleanConditionPrinterHelper(const PrintingPolicy &P) | |||
3135 | : Policy(P) {} | |||
3136 | ||||
3137 | bool handledStmt(Stmt *E, raw_ostream &OS) override { | |||
3138 | const auto *DR = dyn_cast<DeclRefExpr>(E); | |||
3139 | if (DR && DR->getQualifier()) { | |||
3140 | // If this is a qualified name, expand the template arguments in nested | |||
3141 | // qualifiers. | |||
3142 | DR->getQualifier()->print(OS, Policy, true); | |||
3143 | // Then print the decl itself. | |||
3144 | const ValueDecl *VD = DR->getDecl(); | |||
3145 | OS << VD->getName(); | |||
3146 | if (const auto *IV = dyn_cast<VarTemplateSpecializationDecl>(VD)) { | |||
3147 | // This is a template variable, print the expanded template arguments. | |||
3148 | printTemplateArgumentList(OS, IV->getTemplateArgs().asArray(), Policy); | |||
3149 | } | |||
3150 | return true; | |||
3151 | } | |||
3152 | return false; | |||
3153 | } | |||
3154 | ||||
3155 | private: | |||
3156 | const PrintingPolicy Policy; | |||
3157 | }; | |||
3158 | ||||
3159 | } // end anonymous namespace | |||
3160 | ||||
3161 | std::pair<Expr *, std::string> | |||
3162 | Sema::findFailedBooleanCondition(Expr *Cond) { | |||
3163 | Cond = lookThroughRangesV3Condition(PP, Cond); | |||
3164 | ||||
3165 | // Separate out all of the terms in a conjunction. | |||
3166 | SmallVector<Expr *, 4> Terms; | |||
3167 | collectConjunctionTerms(Cond, Terms); | |||
3168 | ||||
3169 | // Determine which term failed. | |||
3170 | Expr *FailedCond = nullptr; | |||
3171 | for (Expr *Term : Terms) { | |||
3172 | Expr *TermAsWritten = Term->IgnoreParenImpCasts(); | |||
3173 | ||||
3174 | // Literals are uninteresting. | |||
3175 | if (isa<CXXBoolLiteralExpr>(TermAsWritten) || | |||
3176 | isa<IntegerLiteral>(TermAsWritten)) | |||
3177 | continue; | |||
3178 | ||||
3179 | // The initialization of the parameter from the argument is | |||
3180 | // a constant-evaluated context. | |||
3181 | EnterExpressionEvaluationContext ConstantEvaluated( | |||
3182 | *this, Sema::ExpressionEvaluationContext::ConstantEvaluated); | |||
3183 | ||||
3184 | bool Succeeded; | |||
3185 | if (Term->EvaluateAsBooleanCondition(Succeeded, Context) && | |||
3186 | !Succeeded) { | |||
3187 | FailedCond = TermAsWritten; | |||
3188 | break; | |||
3189 | } | |||
3190 | } | |||
3191 | if (!FailedCond) | |||
3192 | FailedCond = Cond->IgnoreParenImpCasts(); | |||
3193 | ||||
3194 | std::string Description; | |||
3195 | { | |||
3196 | llvm::raw_string_ostream Out(Description); | |||
3197 | PrintingPolicy Policy = getPrintingPolicy(); | |||
3198 | Policy.PrintCanonicalTypes = true; | |||
3199 | FailedBooleanConditionPrinterHelper Helper(Policy); | |||
3200 | FailedCond->printPretty(Out, &Helper, Policy, 0, "\n", nullptr); | |||
3201 | } | |||
3202 | return { FailedCond, Description }; | |||
3203 | } | |||
3204 | ||||
3205 | QualType Sema::CheckTemplateIdType(TemplateName Name, | |||
3206 | SourceLocation TemplateLoc, | |||
3207 | TemplateArgumentListInfo &TemplateArgs) { | |||
3208 | DependentTemplateName *DTN | |||
3209 | = Name.getUnderlying().getAsDependentTemplateName(); | |||
3210 | if (DTN && DTN->isIdentifier()) | |||
3211 | // When building a template-id where the template-name is dependent, | |||
3212 | // assume the template is a type template. Either our assumption is | |||
3213 | // correct, or the code is ill-formed and will be diagnosed when the | |||
3214 | // dependent name is substituted. | |||
3215 | return Context.getDependentTemplateSpecializationType(ETK_None, | |||
3216 | DTN->getQualifier(), | |||
3217 | DTN->getIdentifier(), | |||
3218 | TemplateArgs); | |||
3219 | ||||
3220 | TemplateDecl *Template = Name.getAsTemplateDecl(); | |||
3221 | if (!Template || isa<FunctionTemplateDecl>(Template) || | |||
3222 | isa<VarTemplateDecl>(Template)) { | |||
3223 | // We might have a substituted template template parameter pack. If so, | |||
3224 | // build a template specialization type for it. | |||
3225 | if (Name.getAsSubstTemplateTemplateParmPack()) | |||
3226 | return Context.getTemplateSpecializationType(Name, TemplateArgs); | |||
3227 | ||||
3228 | Diag(TemplateLoc, diag::err_template_id_not_a_type) | |||
3229 | << Name; | |||
3230 | NoteAllFoundTemplates(Name); | |||
3231 | return QualType(); | |||
3232 | } | |||
3233 | ||||
3234 | // Check that the template argument list is well-formed for this | |||
3235 | // template. | |||
3236 | SmallVector<TemplateArgument, 4> Converted; | |||
3237 | if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs, | |||
3238 | false, Converted)) | |||
3239 | return QualType(); | |||
3240 | ||||
3241 | QualType CanonType; | |||
3242 | ||||
3243 | bool InstantiationDependent = false; | |||
3244 | if (TypeAliasTemplateDecl *AliasTemplate = | |||
3245 | dyn_cast<TypeAliasTemplateDecl>(Template)) { | |||
3246 | // Find the canonical type for this type alias template specialization. | |||
3247 | TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl(); | |||
3248 | if (Pattern->isInvalidDecl()) | |||
3249 | return QualType(); | |||
3250 | ||||
3251 | TemplateArgumentList StackTemplateArgs(TemplateArgumentList::OnStack, | |||
3252 | Converted); | |||
3253 | ||||
3254 | // Only substitute for the innermost template argument list. | |||
3255 | MultiLevelTemplateArgumentList TemplateArgLists; | |||
3256 | TemplateArgLists.addOuterTemplateArguments(&StackTemplateArgs); | |||
3257 | unsigned Depth = AliasTemplate->getTemplateParameters()->getDepth(); | |||
3258 | for (unsigned I = 0; I < Depth; ++I) | |||
3259 | TemplateArgLists.addOuterTemplateArguments(None); | |||
3260 | ||||
3261 | LocalInstantiationScope Scope(*this); | |||
3262 | InstantiatingTemplate Inst(*this, TemplateLoc, Template); | |||
3263 | if (Inst.isInvalid()) | |||
3264 | return QualType(); | |||
3265 | ||||
3266 | CanonType = SubstType(Pattern->getUnderlyingType(), | |||
3267 | TemplateArgLists, AliasTemplate->getLocation(), | |||
3268 | AliasTemplate->getDeclName()); | |||
3269 | if (CanonType.isNull()) { | |||
3270 | // If this was enable_if and we failed to find the nested type | |||
3271 | // within enable_if in a SFINAE context, dig out the specific | |||
3272 | // enable_if condition that failed and present that instead. | |||
3273 | if (isEnableIfAliasTemplate(AliasTemplate)) { | |||
3274 | if (auto DeductionInfo = isSFINAEContext()) { | |||
3275 | if (*DeductionInfo && | |||
3276 | (*DeductionInfo)->hasSFINAEDiagnostic() && | |||
3277 | (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() == | |||
3278 | diag::err_typename_nested_not_found_enable_if && | |||
3279 | TemplateArgs[0].getArgument().getKind() | |||
3280 | == TemplateArgument::Expression) { | |||
3281 | Expr *FailedCond; | |||
3282 | std::string FailedDescription; | |||
3283 | std::tie(FailedCond, FailedDescription) = | |||
3284 | findFailedBooleanCondition(TemplateArgs[0].getSourceExpression()); | |||
3285 | ||||
3286 | // Remove the old SFINAE diagnostic. | |||
3287 | PartialDiagnosticAt OldDiag = | |||
3288 | {SourceLocation(), PartialDiagnostic::NullDiagnostic()}; | |||
3289 | (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag); | |||
3290 | ||||
3291 | // Add a new SFINAE diagnostic specifying which condition | |||
3292 | // failed. | |||
3293 | (*DeductionInfo)->addSFINAEDiagnostic( | |||
3294 | OldDiag.first, | |||
3295 | PDiag(diag::err_typename_nested_not_found_requirement) | |||
3296 | << FailedDescription | |||
3297 | << FailedCond->getSourceRange()); | |||
3298 | } | |||
3299 | } | |||
3300 | } | |||
3301 | ||||
3302 | return QualType(); | |||
3303 | } | |||
3304 | } else if (Name.isDependent() || | |||
3305 | TemplateSpecializationType::anyDependentTemplateArguments( | |||
3306 | TemplateArgs, InstantiationDependent)) { | |||
3307 | // This class template specialization is a dependent | |||
3308 | // type. Therefore, its canonical type is another class template | |||
3309 | // specialization type that contains all of the converted | |||
3310 | // arguments in canonical form. This ensures that, e.g., A<T> and | |||
3311 | // A<T, T> have identical types when A is declared as: | |||
3312 | // | |||
3313 | // template<typename T, typename U = T> struct A; | |||
3314 | CanonType = Context.getCanonicalTemplateSpecializationType(Name, Converted); | |||
3315 | ||||
3316 | // This might work out to be a current instantiation, in which | |||
3317 | // case the canonical type needs to be the InjectedClassNameType. | |||
3318 | // | |||
3319 | // TODO: in theory this could be a simple hashtable lookup; most | |||
3320 | // changes to CurContext don't change the set of current | |||
3321 | // instantiations. | |||
3322 | if (isa<ClassTemplateDecl>(Template)) { | |||
3323 | for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) { | |||
3324 | // If we get out to a namespace, we're done. | |||
3325 | if (Ctx->isFileContext()) break; | |||
3326 | ||||
3327 | // If this isn't a record, keep looking. | |||
3328 | CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx); | |||
3329 | if (!Record) continue; | |||
3330 | ||||
3331 | // Look for one of the two cases with InjectedClassNameTypes | |||
3332 | // and check whether it's the same template. | |||
3333 | if (!isa<ClassTemplatePartialSpecializationDecl>(Record) && | |||
3334 | !Record->getDescribedClassTemplate()) | |||
3335 | continue; | |||
3336 | ||||
3337 | // Fetch the injected class name type and check whether its | |||
3338 | // injected type is equal to the type we just built. | |||
3339 | QualType ICNT = Context.getTypeDeclType(Record); | |||
3340 | QualType Injected = cast<InjectedClassNameType>(ICNT) | |||
3341 | ->getInjectedSpecializationType(); | |||
3342 | ||||
3343 | if (CanonType != Injected->getCanonicalTypeInternal()) | |||
3344 | continue; | |||
3345 | ||||
3346 | // If so, the canonical type of this TST is the injected | |||
3347 | // class name type of the record we just found. | |||
3348 | assert(ICNT.isCanonical())((ICNT.isCanonical()) ? static_cast<void> (0) : __assert_fail ("ICNT.isCanonical()", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3348, __PRETTY_FUNCTION__)); | |||
3349 | CanonType = ICNT; | |||
3350 | break; | |||
3351 | } | |||
3352 | } | |||
3353 | } else if (ClassTemplateDecl *ClassTemplate | |||
3354 | = dyn_cast<ClassTemplateDecl>(Template)) { | |||
3355 | // Find the class template specialization declaration that | |||
3356 | // corresponds to these arguments. | |||
3357 | void *InsertPos = nullptr; | |||
3358 | ClassTemplateSpecializationDecl *Decl | |||
3359 | = ClassTemplate->findSpecialization(Converted, InsertPos); | |||
3360 | if (!Decl) { | |||
3361 | // This is the first time we have referenced this class template | |||
3362 | // specialization. Create the canonical declaration and add it to | |||
3363 | // the set of specializations. | |||
3364 | Decl = ClassTemplateSpecializationDecl::Create( | |||
3365 | Context, ClassTemplate->getTemplatedDecl()->getTagKind(), | |||
3366 | ClassTemplate->getDeclContext(), | |||
3367 | ClassTemplate->getTemplatedDecl()->getBeginLoc(), | |||
3368 | ClassTemplate->getLocation(), ClassTemplate, Converted, nullptr); | |||
3369 | ClassTemplate->AddSpecialization(Decl, InsertPos); | |||
3370 | if (ClassTemplate->isOutOfLine()) | |||
3371 | Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext()); | |||
3372 | } | |||
3373 | ||||
3374 | if (Decl->getSpecializationKind() == TSK_Undeclared) { | |||
3375 | MultiLevelTemplateArgumentList TemplateArgLists; | |||
3376 | TemplateArgLists.addOuterTemplateArguments(Converted); | |||
3377 | InstantiateAttrsForDecl(TemplateArgLists, ClassTemplate->getTemplatedDecl(), | |||
3378 | Decl); | |||
3379 | } | |||
3380 | ||||
3381 | // Diagnose uses of this specialization. | |||
3382 | (void)DiagnoseUseOfDecl(Decl, TemplateLoc); | |||
3383 | ||||
3384 | CanonType = Context.getTypeDeclType(Decl); | |||
3385 | assert(isa<RecordType>(CanonType) &&((isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType" ) ? static_cast<void> (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3386, __PRETTY_FUNCTION__)) | |||
3386 | "type of non-dependent specialization is not a RecordType")((isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType" ) ? static_cast<void> (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3386, __PRETTY_FUNCTION__)); | |||
3387 | } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) { | |||
3388 | CanonType = checkBuiltinTemplateIdType(*this, BTD, Converted, TemplateLoc, | |||
3389 | TemplateArgs); | |||
3390 | } | |||
3391 | ||||
3392 | // Build the fully-sugared type for this class template | |||
3393 | // specialization, which refers back to the class template | |||
3394 | // specialization we created or found. | |||
3395 | return Context.getTemplateSpecializationType(Name, TemplateArgs, CanonType); | |||
3396 | } | |||
3397 | ||||
3398 | void Sema::ActOnUndeclaredTypeTemplateName(Scope *S, TemplateTy &ParsedName, | |||
3399 | TemplateNameKind &TNK, | |||
3400 | SourceLocation NameLoc, | |||
3401 | IdentifierInfo *&II) { | |||
3402 | assert(TNK == TNK_Undeclared_template && "not an undeclared template name")((TNK == TNK_Undeclared_template && "not an undeclared template name" ) ? static_cast<void> (0) : __assert_fail ("TNK == TNK_Undeclared_template && \"not an undeclared template name\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3402, __PRETTY_FUNCTION__)); | |||
3403 | ||||
3404 | TemplateName Name = ParsedName.get(); | |||
3405 | auto *ATN = Name.getAsAssumedTemplateName(); | |||
3406 | assert(ATN && "not an assumed template name")((ATN && "not an assumed template name") ? static_cast <void> (0) : __assert_fail ("ATN && \"not an assumed template name\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3406, __PRETTY_FUNCTION__)); | |||
3407 | II = ATN->getDeclName().getAsIdentifierInfo(); | |||
3408 | ||||
3409 | if (!resolveAssumedTemplateNameAsType(S, Name, NameLoc, /*Diagnose*/false)) { | |||
3410 | // Resolved to a type template name. | |||
3411 | ParsedName = TemplateTy::make(Name); | |||
3412 | TNK = TNK_Type_template; | |||
3413 | } | |||
3414 | } | |||
3415 | ||||
3416 | bool Sema::resolveAssumedTemplateNameAsType(Scope *S, TemplateName &Name, | |||
3417 | SourceLocation NameLoc, | |||
3418 | bool Diagnose) { | |||
3419 | // We assumed this undeclared identifier to be an (ADL-only) function | |||
3420 | // template name, but it was used in a context where a type was required. | |||
3421 | // Try to typo-correct it now. | |||
3422 | AssumedTemplateStorage *ATN = Name.getAsAssumedTemplateName(); | |||
3423 | assert(ATN && "not an assumed template name")((ATN && "not an assumed template name") ? static_cast <void> (0) : __assert_fail ("ATN && \"not an assumed template name\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3423, __PRETTY_FUNCTION__)); | |||
3424 | ||||
3425 | LookupResult R(*this, ATN->getDeclName(), NameLoc, LookupOrdinaryName); | |||
3426 | struct CandidateCallback : CorrectionCandidateCallback { | |||
3427 | bool ValidateCandidate(const TypoCorrection &TC) override { | |||
3428 | return TC.getCorrectionDecl() && | |||
3429 | getAsTypeTemplateDecl(TC.getCorrectionDecl()); | |||
3430 | } | |||
3431 | std::unique_ptr<CorrectionCandidateCallback> clone() override { | |||
3432 | return llvm::make_unique<CandidateCallback>(*this); | |||
3433 | } | |||
3434 | } FilterCCC; | |||
3435 | ||||
3436 | TypoCorrection Corrected = | |||
3437 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, nullptr, | |||
3438 | FilterCCC, CTK_ErrorRecovery); | |||
3439 | if (Corrected && Corrected.getFoundDecl()) { | |||
3440 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) | |||
3441 | << ATN->getDeclName()); | |||
3442 | Name = TemplateName(Corrected.getCorrectionDeclAs<TemplateDecl>()); | |||
3443 | return false; | |||
3444 | } | |||
3445 | ||||
3446 | if (Diagnose) | |||
3447 | Diag(R.getNameLoc(), diag::err_no_template) << R.getLookupName(); | |||
3448 | return true; | |||
3449 | } | |||
3450 | ||||
3451 | TypeResult Sema::ActOnTemplateIdType( | |||
3452 | Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, | |||
3453 | TemplateTy TemplateD, IdentifierInfo *TemplateII, | |||
3454 | SourceLocation TemplateIILoc, SourceLocation LAngleLoc, | |||
3455 | ASTTemplateArgsPtr TemplateArgsIn, SourceLocation RAngleLoc, | |||
3456 | bool IsCtorOrDtorName, bool IsClassName) { | |||
3457 | if (SS.isInvalid()) | |||
3458 | return true; | |||
3459 | ||||
3460 | if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) { | |||
3461 | DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false); | |||
3462 | ||||
3463 | // C++ [temp.res]p3: | |||
3464 | // A qualified-id that refers to a type and in which the | |||
3465 | // nested-name-specifier depends on a template-parameter (14.6.2) | |||
3466 | // shall be prefixed by the keyword typename to indicate that the | |||
3467 | // qualified-id denotes a type, forming an | |||
3468 | // elaborated-type-specifier (7.1.5.3). | |||
3469 | if (!LookupCtx && isDependentScopeSpecifier(SS)) { | |||
3470 | Diag(SS.getBeginLoc(), diag::err_typename_missing_template) | |||
3471 | << SS.getScopeRep() << TemplateII->getName(); | |||
3472 | // Recover as if 'typename' were specified. | |||
3473 | // FIXME: This is not quite correct recovery as we don't transform SS | |||
3474 | // into the corresponding dependent form (and we don't diagnose missing | |||
3475 | // 'template' keywords within SS as a result). | |||
3476 | return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc, | |||
3477 | TemplateD, TemplateII, TemplateIILoc, LAngleLoc, | |||
3478 | TemplateArgsIn, RAngleLoc); | |||
3479 | } | |||
3480 | ||||
3481 | // Per C++ [class.qual]p2, if the template-id was an injected-class-name, | |||
3482 | // it's not actually allowed to be used as a type in most cases. Because | |||
3483 | // we annotate it before we know whether it's valid, we have to check for | |||
3484 | // this case here. | |||
3485 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); | |||
3486 | if (LookupRD && LookupRD->getIdentifier() == TemplateII) { | |||
3487 | Diag(TemplateIILoc, | |||
3488 | TemplateKWLoc.isInvalid() | |||
3489 | ? diag::err_out_of_line_qualified_id_type_names_constructor | |||
3490 | : diag::ext_out_of_line_qualified_id_type_names_constructor) | |||
3491 | << TemplateII << 0 /*injected-class-name used as template name*/ | |||
3492 | << 1 /*if any keyword was present, it was 'template'*/; | |||
3493 | } | |||
3494 | } | |||
3495 | ||||
3496 | TemplateName Template = TemplateD.get(); | |||
3497 | if (Template.getAsAssumedTemplateName() && | |||
3498 | resolveAssumedTemplateNameAsType(S, Template, TemplateIILoc)) | |||
3499 | return true; | |||
3500 | ||||
3501 | // Translate the parser's template argument list in our AST format. | |||
3502 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); | |||
3503 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); | |||
3504 | ||||
3505 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { | |||
3506 | QualType T | |||
3507 | = Context.getDependentTemplateSpecializationType(ETK_None, | |||
3508 | DTN->getQualifier(), | |||
3509 | DTN->getIdentifier(), | |||
3510 | TemplateArgs); | |||
3511 | // Build type-source information. | |||
3512 | TypeLocBuilder TLB; | |||
3513 | DependentTemplateSpecializationTypeLoc SpecTL | |||
3514 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); | |||
3515 | SpecTL.setElaboratedKeywordLoc(SourceLocation()); | |||
3516 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
3517 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); | |||
3518 | SpecTL.setTemplateNameLoc(TemplateIILoc); | |||
3519 | SpecTL.setLAngleLoc(LAngleLoc); | |||
3520 | SpecTL.setRAngleLoc(RAngleLoc); | |||
3521 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) | |||
3522 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); | |||
3523 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); | |||
3524 | } | |||
3525 | ||||
3526 | QualType Result = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs); | |||
3527 | if (Result.isNull()) | |||
3528 | return true; | |||
3529 | ||||
3530 | // Build type-source information. | |||
3531 | TypeLocBuilder TLB; | |||
3532 | TemplateSpecializationTypeLoc SpecTL | |||
3533 | = TLB.push<TemplateSpecializationTypeLoc>(Result); | |||
3534 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); | |||
3535 | SpecTL.setTemplateNameLoc(TemplateIILoc); | |||
3536 | SpecTL.setLAngleLoc(LAngleLoc); | |||
3537 | SpecTL.setRAngleLoc(RAngleLoc); | |||
3538 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) | |||
3539 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); | |||
3540 | ||||
3541 | // NOTE: avoid constructing an ElaboratedTypeLoc if this is a | |||
3542 | // constructor or destructor name (in such a case, the scope specifier | |||
3543 | // will be attached to the enclosing Decl or Expr node). | |||
3544 | if (SS.isNotEmpty() && !IsCtorOrDtorName) { | |||
3545 | // Create an elaborated-type-specifier containing the nested-name-specifier. | |||
3546 | Result = Context.getElaboratedType(ETK_None, SS.getScopeRep(), Result); | |||
3547 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); | |||
3548 | ElabTL.setElaboratedKeywordLoc(SourceLocation()); | |||
3549 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
3550 | } | |||
3551 | ||||
3552 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); | |||
3553 | } | |||
3554 | ||||
3555 | TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK, | |||
3556 | TypeSpecifierType TagSpec, | |||
3557 | SourceLocation TagLoc, | |||
3558 | CXXScopeSpec &SS, | |||
3559 | SourceLocation TemplateKWLoc, | |||
3560 | TemplateTy TemplateD, | |||
3561 | SourceLocation TemplateLoc, | |||
3562 | SourceLocation LAngleLoc, | |||
3563 | ASTTemplateArgsPtr TemplateArgsIn, | |||
3564 | SourceLocation RAngleLoc) { | |||
3565 | TemplateName Template = TemplateD.get(); | |||
3566 | ||||
3567 | // Translate the parser's template argument list in our AST format. | |||
3568 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); | |||
3569 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); | |||
3570 | ||||
3571 | // Determine the tag kind | |||
3572 | TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | |||
3573 | ElaboratedTypeKeyword Keyword | |||
3574 | = TypeWithKeyword::getKeywordForTagTypeKind(TagKind); | |||
3575 | ||||
3576 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { | |||
3577 | QualType T = Context.getDependentTemplateSpecializationType(Keyword, | |||
3578 | DTN->getQualifier(), | |||
3579 | DTN->getIdentifier(), | |||
3580 | TemplateArgs); | |||
3581 | ||||
3582 | // Build type-source information. | |||
3583 | TypeLocBuilder TLB; | |||
3584 | DependentTemplateSpecializationTypeLoc SpecTL | |||
3585 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); | |||
3586 | SpecTL.setElaboratedKeywordLoc(TagLoc); | |||
3587 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
3588 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); | |||
3589 | SpecTL.setTemplateNameLoc(TemplateLoc); | |||
3590 | SpecTL.setLAngleLoc(LAngleLoc); | |||
3591 | SpecTL.setRAngleLoc(RAngleLoc); | |||
3592 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) | |||
3593 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); | |||
3594 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); | |||
3595 | } | |||
3596 | ||||
3597 | if (TypeAliasTemplateDecl *TAT = | |||
3598 | dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) { | |||
3599 | // C++0x [dcl.type.elab]p2: | |||
3600 | // If the identifier resolves to a typedef-name or the simple-template-id | |||
3601 | // resolves to an alias template specialization, the | |||
3602 | // elaborated-type-specifier is ill-formed. | |||
3603 | Diag(TemplateLoc, diag::err_tag_reference_non_tag) | |||
3604 | << TAT << NTK_TypeAliasTemplate << TagKind; | |||
3605 | Diag(TAT->getLocation(), diag::note_declared_at); | |||
3606 | } | |||
3607 | ||||
3608 | QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs); | |||
3609 | if (Result.isNull()) | |||
3610 | return TypeResult(true); | |||
3611 | ||||
3612 | // Check the tag kind | |||
3613 | if (const RecordType *RT = Result->getAs<RecordType>()) { | |||
3614 | RecordDecl *D = RT->getDecl(); | |||
3615 | ||||
3616 | IdentifierInfo *Id = D->getIdentifier(); | |||
3617 | assert(Id && "templated class must have an identifier")((Id && "templated class must have an identifier") ? static_cast <void> (0) : __assert_fail ("Id && \"templated class must have an identifier\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3617, __PRETTY_FUNCTION__)); | |||
3618 | ||||
3619 | if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition, | |||
3620 | TagLoc, Id)) { | |||
3621 | Diag(TagLoc, diag::err_use_with_wrong_tag) | |||
3622 | << Result | |||
3623 | << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName()); | |||
3624 | Diag(D->getLocation(), diag::note_previous_use); | |||
3625 | } | |||
3626 | } | |||
3627 | ||||
3628 | // Provide source-location information for the template specialization. | |||
3629 | TypeLocBuilder TLB; | |||
3630 | TemplateSpecializationTypeLoc SpecTL | |||
3631 | = TLB.push<TemplateSpecializationTypeLoc>(Result); | |||
3632 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); | |||
3633 | SpecTL.setTemplateNameLoc(TemplateLoc); | |||
3634 | SpecTL.setLAngleLoc(LAngleLoc); | |||
3635 | SpecTL.setRAngleLoc(RAngleLoc); | |||
3636 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) | |||
3637 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); | |||
3638 | ||||
3639 | // Construct an elaborated type containing the nested-name-specifier (if any) | |||
3640 | // and tag keyword. | |||
3641 | Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result); | |||
3642 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); | |||
3643 | ElabTL.setElaboratedKeywordLoc(TagLoc); | |||
3644 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
3645 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); | |||
3646 | } | |||
3647 | ||||
3648 | static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized, | |||
3649 | NamedDecl *PrevDecl, | |||
3650 | SourceLocation Loc, | |||
3651 | bool IsPartialSpecialization); | |||
3652 | ||||
3653 | static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D); | |||
3654 | ||||
3655 | static bool isTemplateArgumentTemplateParameter( | |||
3656 | const TemplateArgument &Arg, unsigned Depth, unsigned Index) { | |||
3657 | switch (Arg.getKind()) { | |||
3658 | case TemplateArgument::Null: | |||
3659 | case TemplateArgument::NullPtr: | |||
3660 | case TemplateArgument::Integral: | |||
3661 | case TemplateArgument::Declaration: | |||
3662 | case TemplateArgument::Pack: | |||
3663 | case TemplateArgument::TemplateExpansion: | |||
3664 | return false; | |||
3665 | ||||
3666 | case TemplateArgument::Type: { | |||
3667 | QualType Type = Arg.getAsType(); | |||
3668 | const TemplateTypeParmType *TPT = | |||
3669 | Arg.getAsType()->getAs<TemplateTypeParmType>(); | |||
3670 | return TPT && !Type.hasQualifiers() && | |||
3671 | TPT->getDepth() == Depth && TPT->getIndex() == Index; | |||
3672 | } | |||
3673 | ||||
3674 | case TemplateArgument::Expression: { | |||
3675 | DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr()); | |||
3676 | if (!DRE || !DRE->getDecl()) | |||
3677 | return false; | |||
3678 | const NonTypeTemplateParmDecl *NTTP = | |||
3679 | dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); | |||
3680 | return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index; | |||
3681 | } | |||
3682 | ||||
3683 | case TemplateArgument::Template: | |||
3684 | const TemplateTemplateParmDecl *TTP = | |||
3685 | dyn_cast_or_null<TemplateTemplateParmDecl>( | |||
3686 | Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl()); | |||
3687 | return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index; | |||
3688 | } | |||
3689 | llvm_unreachable("unexpected kind of template argument")::llvm::llvm_unreachable_internal("unexpected kind of template argument" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3689); | |||
3690 | } | |||
3691 | ||||
3692 | static bool isSameAsPrimaryTemplate(TemplateParameterList *Params, | |||
3693 | ArrayRef<TemplateArgument> Args) { | |||
3694 | if (Params->size() != Args.size()) | |||
3695 | return false; | |||
3696 | ||||
3697 | unsigned Depth = Params->getDepth(); | |||
3698 | ||||
3699 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { | |||
3700 | TemplateArgument Arg = Args[I]; | |||
3701 | ||||
3702 | // If the parameter is a pack expansion, the argument must be a pack | |||
3703 | // whose only element is a pack expansion. | |||
3704 | if (Params->getParam(I)->isParameterPack()) { | |||
3705 | if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 || | |||
3706 | !Arg.pack_begin()->isPackExpansion()) | |||
3707 | return false; | |||
3708 | Arg = Arg.pack_begin()->getPackExpansionPattern(); | |||
3709 | } | |||
3710 | ||||
3711 | if (!isTemplateArgumentTemplateParameter(Arg, Depth, I)) | |||
3712 | return false; | |||
3713 | } | |||
3714 | ||||
3715 | return true; | |||
3716 | } | |||
3717 | ||||
3718 | /// Convert the parser's template argument list representation into our form. | |||
3719 | static TemplateArgumentListInfo | |||
3720 | makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) { | |||
3721 | TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc, | |||
3722 | TemplateId.RAngleLoc); | |||
3723 | ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(), | |||
3724 | TemplateId.NumArgs); | |||
3725 | S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs); | |||
3726 | return TemplateArgs; | |||
3727 | } | |||
3728 | ||||
3729 | template<typename PartialSpecDecl> | |||
3730 | static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) { | |||
3731 | if (Partial->getDeclContext()->isDependentContext()) | |||
3732 | return; | |||
3733 | ||||
3734 | // FIXME: Get the TDK from deduction in order to provide better diagnostics | |||
3735 | // for non-substitution-failure issues? | |||
3736 | TemplateDeductionInfo Info(Partial->getLocation()); | |||
3737 | if (S.isMoreSpecializedThanPrimary(Partial, Info)) | |||
3738 | return; | |||
3739 | ||||
3740 | auto *Template = Partial->getSpecializedTemplate(); | |||
3741 | S.Diag(Partial->getLocation(), | |||
3742 | diag::ext_partial_spec_not_more_specialized_than_primary) | |||
3743 | << isa<VarTemplateDecl>(Template); | |||
3744 | ||||
3745 | if (Info.hasSFINAEDiagnostic()) { | |||
3746 | PartialDiagnosticAt Diag = {SourceLocation(), | |||
3747 | PartialDiagnostic::NullDiagnostic()}; | |||
3748 | Info.takeSFINAEDiagnostic(Diag); | |||
3749 | SmallString<128> SFINAEArgString; | |||
3750 | Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString); | |||
3751 | S.Diag(Diag.first, | |||
3752 | diag::note_partial_spec_not_more_specialized_than_primary) | |||
3753 | << SFINAEArgString; | |||
3754 | } | |||
3755 | ||||
3756 | S.Diag(Template->getLocation(), diag::note_template_decl_here); | |||
3757 | } | |||
3758 | ||||
3759 | static void | |||
3760 | noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams, | |||
3761 | const llvm::SmallBitVector &DeducibleParams) { | |||
3762 | for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) { | |||
3763 | if (!DeducibleParams[I]) { | |||
3764 | NamedDecl *Param = TemplateParams->getParam(I); | |||
3765 | if (Param->getDeclName()) | |||
3766 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) | |||
3767 | << Param->getDeclName(); | |||
3768 | else | |||
3769 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) | |||
3770 | << "(anonymous)"; | |||
3771 | } | |||
3772 | } | |||
3773 | } | |||
3774 | ||||
3775 | ||||
3776 | template<typename PartialSpecDecl> | |||
3777 | static void checkTemplatePartialSpecialization(Sema &S, | |||
3778 | PartialSpecDecl *Partial) { | |||
3779 | // C++1z [temp.class.spec]p8: (DR1495) | |||
3780 | // - The specialization shall be more specialized than the primary | |||
3781 | // template (14.5.5.2). | |||
3782 | checkMoreSpecializedThanPrimary(S, Partial); | |||
3783 | ||||
3784 | // C++ [temp.class.spec]p8: (DR1315) | |||
3785 | // - Each template-parameter shall appear at least once in the | |||
3786 | // template-id outside a non-deduced context. | |||
3787 | // C++1z [temp.class.spec.match]p3 (P0127R2) | |||
3788 | // If the template arguments of a partial specialization cannot be | |||
3789 | // deduced because of the structure of its template-parameter-list | |||
3790 | // and the template-id, the program is ill-formed. | |||
3791 | auto *TemplateParams = Partial->getTemplateParameters(); | |||
3792 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); | |||
3793 | S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true, | |||
3794 | TemplateParams->getDepth(), DeducibleParams); | |||
3795 | ||||
3796 | if (!DeducibleParams.all()) { | |||
3797 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); | |||
3798 | S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible) | |||
3799 | << isa<VarTemplatePartialSpecializationDecl>(Partial) | |||
3800 | << (NumNonDeducible > 1) | |||
3801 | << SourceRange(Partial->getLocation(), | |||
3802 | Partial->getTemplateArgsAsWritten()->RAngleLoc); | |||
3803 | noteNonDeducibleParameters(S, TemplateParams, DeducibleParams); | |||
3804 | } | |||
3805 | } | |||
3806 | ||||
3807 | void Sema::CheckTemplatePartialSpecialization( | |||
3808 | ClassTemplatePartialSpecializationDecl *Partial) { | |||
3809 | checkTemplatePartialSpecialization(*this, Partial); | |||
3810 | } | |||
3811 | ||||
3812 | void Sema::CheckTemplatePartialSpecialization( | |||
3813 | VarTemplatePartialSpecializationDecl *Partial) { | |||
3814 | checkTemplatePartialSpecialization(*this, Partial); | |||
3815 | } | |||
3816 | ||||
3817 | void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) { | |||
3818 | // C++1z [temp.param]p11: | |||
3819 | // A template parameter of a deduction guide template that does not have a | |||
3820 | // default-argument shall be deducible from the parameter-type-list of the | |||
3821 | // deduction guide template. | |||
3822 | auto *TemplateParams = TD->getTemplateParameters(); | |||
3823 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); | |||
3824 | MarkDeducedTemplateParameters(TD, DeducibleParams); | |||
3825 | for (unsigned I = 0; I != TemplateParams->size(); ++I) { | |||
3826 | // A parameter pack is deducible (to an empty pack). | |||
3827 | auto *Param = TemplateParams->getParam(I); | |||
3828 | if (Param->isParameterPack() || hasVisibleDefaultArgument(Param)) | |||
3829 | DeducibleParams[I] = true; | |||
3830 | } | |||
3831 | ||||
3832 | if (!DeducibleParams.all()) { | |||
3833 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); | |||
3834 | Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible) | |||
3835 | << (NumNonDeducible > 1); | |||
3836 | noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams); | |||
3837 | } | |||
3838 | } | |||
3839 | ||||
3840 | DeclResult Sema::ActOnVarTemplateSpecialization( | |||
3841 | Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc, | |||
3842 | TemplateParameterList *TemplateParams, StorageClass SC, | |||
3843 | bool IsPartialSpecialization) { | |||
3844 | // D must be variable template id. | |||
3845 | assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&((D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && "Variable template specialization is declared with a template it." ) ? static_cast<void> (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3846, __PRETTY_FUNCTION__)) | |||
3846 | "Variable template specialization is declared with a template it.")((D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && "Variable template specialization is declared with a template it." ) ? static_cast<void> (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template it.\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 3846, __PRETTY_FUNCTION__)); | |||
3847 | ||||
3848 | TemplateIdAnnotation *TemplateId = D.getName().TemplateId; | |||
3849 | TemplateArgumentListInfo TemplateArgs = | |||
3850 | makeTemplateArgumentListInfo(*this, *TemplateId); | |||
3851 | SourceLocation TemplateNameLoc = D.getIdentifierLoc(); | |||
3852 | SourceLocation LAngleLoc = TemplateId->LAngleLoc; | |||
3853 | SourceLocation RAngleLoc = TemplateId->RAngleLoc; | |||
3854 | ||||
3855 | TemplateName Name = TemplateId->Template.get(); | |||
3856 | ||||
3857 | // The template-id must name a variable template. | |||
3858 | VarTemplateDecl *VarTemplate = | |||
3859 | dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl()); | |||
3860 | if (!VarTemplate) { | |||
3861 | NamedDecl *FnTemplate; | |||
3862 | if (auto *OTS = Name.getAsOverloadedTemplate()) | |||
3863 | FnTemplate = *OTS->begin(); | |||
3864 | else | |||
3865 | FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl()); | |||
3866 | if (FnTemplate) | |||
3867 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method) | |||
3868 | << FnTemplate->getDeclName(); | |||
3869 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template) | |||
3870 | << IsPartialSpecialization; | |||
3871 | } | |||
3872 | ||||
3873 | // Check for unexpanded parameter packs in any of the template arguments. | |||
3874 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) | |||
3875 | if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], | |||
3876 | UPPC_PartialSpecialization)) | |||
3877 | return true; | |||
3878 | ||||
3879 | // Check that the template argument list is well-formed for this | |||
3880 | // template. | |||
3881 | SmallVector<TemplateArgument, 4> Converted; | |||
3882 | if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs, | |||
3883 | false, Converted)) | |||
3884 | return true; | |||
3885 | ||||
3886 | // Find the variable template (partial) specialization declaration that | |||
3887 | // corresponds to these arguments. | |||
3888 | if (IsPartialSpecialization) { | |||
3889 | if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate, | |||
3890 | TemplateArgs.size(), Converted)) | |||
3891 | return true; | |||
3892 | ||||
3893 | // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we | |||
3894 | // also do them during instantiation. | |||
3895 | bool InstantiationDependent; | |||
3896 | if (!Name.isDependent() && | |||
3897 | !TemplateSpecializationType::anyDependentTemplateArguments( | |||
3898 | TemplateArgs.arguments(), | |||
3899 | InstantiationDependent)) { | |||
3900 | Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) | |||
3901 | << VarTemplate->getDeclName(); | |||
3902 | IsPartialSpecialization = false; | |||
3903 | } | |||
3904 | ||||
3905 | if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(), | |||
3906 | Converted)) { | |||
3907 | // C++ [temp.class.spec]p9b3: | |||
3908 | // | |||
3909 | // -- The argument list of the specialization shall not be identical | |||
3910 | // to the implicit argument list of the primary template. | |||
3911 | Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) | |||
3912 | << /*variable template*/ 1 | |||
3913 | << /*is definition*/(SC != SC_Extern && !CurContext->isRecord()) | |||
3914 | << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); | |||
3915 | // FIXME: Recover from this by treating the declaration as a redeclaration | |||
3916 | // of the primary template. | |||
3917 | return true; | |||
3918 | } | |||
3919 | } | |||
3920 | ||||
3921 | void *InsertPos = nullptr; | |||
3922 | VarTemplateSpecializationDecl *PrevDecl = nullptr; | |||
3923 | ||||
3924 | if (IsPartialSpecialization) | |||
3925 | // FIXME: Template parameter list matters too | |||
3926 | PrevDecl = VarTemplate->findPartialSpecialization(Converted, InsertPos); | |||
3927 | else | |||
3928 | PrevDecl = VarTemplate->findSpecialization(Converted, InsertPos); | |||
3929 | ||||
3930 | VarTemplateSpecializationDecl *Specialization = nullptr; | |||
3931 | ||||
3932 | // Check whether we can declare a variable template specialization in | |||
3933 | // the current scope. | |||
3934 | if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl, | |||
3935 | TemplateNameLoc, | |||
3936 | IsPartialSpecialization)) | |||
3937 | return true; | |||
3938 | ||||
3939 | if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) { | |||
3940 | // Since the only prior variable template specialization with these | |||
3941 | // arguments was referenced but not declared, reuse that | |||
3942 | // declaration node as our own, updating its source location and | |||
3943 | // the list of outer template parameters to reflect our new declaration. | |||
3944 | Specialization = PrevDecl; | |||
3945 | Specialization->setLocation(TemplateNameLoc); | |||
3946 | PrevDecl = nullptr; | |||
3947 | } else if (IsPartialSpecialization) { | |||
3948 | // Create a new class template partial specialization declaration node. | |||
3949 | VarTemplatePartialSpecializationDecl *PrevPartial = | |||
3950 | cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl); | |||
3951 | VarTemplatePartialSpecializationDecl *Partial = | |||
3952 | VarTemplatePartialSpecializationDecl::Create( | |||
3953 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, | |||
3954 | TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC, | |||
3955 | Converted, TemplateArgs); | |||
3956 | ||||
3957 | if (!PrevPartial) | |||
3958 | VarTemplate->AddPartialSpecialization(Partial, InsertPos); | |||
3959 | Specialization = Partial; | |||
3960 | ||||
3961 | // If we are providing an explicit specialization of a member variable | |||
3962 | // template specialization, make a note of that. | |||
3963 | if (PrevPartial && PrevPartial->getInstantiatedFromMember()) | |||
3964 | PrevPartial->setMemberSpecialization(); | |||
3965 | ||||
3966 | CheckTemplatePartialSpecialization(Partial); | |||
3967 | } else { | |||
3968 | // Create a new class template specialization declaration node for | |||
3969 | // this explicit specialization or friend declaration. | |||
3970 | Specialization = VarTemplateSpecializationDecl::Create( | |||
3971 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc, | |||
3972 | VarTemplate, DI->getType(), DI, SC, Converted); | |||
3973 | Specialization->setTemplateArgsInfo(TemplateArgs); | |||
3974 | ||||
3975 | if (!PrevDecl) | |||
3976 | VarTemplate->AddSpecialization(Specialization, InsertPos); | |||
3977 | } | |||
3978 | ||||
3979 | // C++ [temp.expl.spec]p6: | |||
3980 | // If a template, a member template or the member of a class template is | |||
3981 | // explicitly specialized then that specialization shall be declared | |||
3982 | // before the first use of that specialization that would cause an implicit | |||
3983 | // instantiation to take place, in every translation unit in which such a | |||
3984 | // use occurs; no diagnostic is required. | |||
3985 | if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { | |||
3986 | bool Okay = false; | |||
3987 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { | |||
3988 | // Is there any previous explicit specialization declaration? | |||
3989 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { | |||
3990 | Okay = true; | |||
3991 | break; | |||
3992 | } | |||
3993 | } | |||
3994 | ||||
3995 | if (!Okay) { | |||
3996 | SourceRange Range(TemplateNameLoc, RAngleLoc); | |||
3997 | Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) | |||
3998 | << Name << Range; | |||
3999 | ||||
4000 | Diag(PrevDecl->getPointOfInstantiation(), | |||
4001 | diag::note_instantiation_required_here) | |||
4002 | << (PrevDecl->getTemplateSpecializationKind() != | |||
4003 | TSK_ImplicitInstantiation); | |||
4004 | return true; | |||
4005 | } | |||
4006 | } | |||
4007 | ||||
4008 | Specialization->setTemplateKeywordLoc(TemplateKWLoc); | |||
4009 | Specialization->setLexicalDeclContext(CurContext); | |||
4010 | ||||
4011 | // Add the specialization into its lexical context, so that it can | |||
4012 | // be seen when iterating through the list of declarations in that | |||
4013 | // context. However, specializations are not found by name lookup. | |||
4014 | CurContext->addDecl(Specialization); | |||
4015 | ||||
4016 | // Note that this is an explicit specialization. | |||
4017 | Specialization->setSpecializationKind(TSK_ExplicitSpecialization); | |||
4018 | ||||
4019 | if (PrevDecl) { | |||
4020 | // Check that this isn't a redefinition of this specialization, | |||
4021 | // merging with previous declarations. | |||
4022 | LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName, | |||
4023 | forRedeclarationInCurContext()); | |||
4024 | PrevSpec.addDecl(PrevDecl); | |||
4025 | D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec)); | |||
4026 | } else if (Specialization->isStaticDataMember() && | |||
4027 | Specialization->isOutOfLine()) { | |||
4028 | Specialization->setAccess(VarTemplate->getAccess()); | |||
4029 | } | |||
4030 | ||||
4031 | return Specialization; | |||
4032 | } | |||
4033 | ||||
4034 | namespace { | |||
4035 | /// A partial specialization whose template arguments have matched | |||
4036 | /// a given template-id. | |||
4037 | struct PartialSpecMatchResult { | |||
4038 | VarTemplatePartialSpecializationDecl *Partial; | |||
4039 | TemplateArgumentList *Args; | |||
4040 | }; | |||
4041 | } // end anonymous namespace | |||
4042 | ||||
4043 | DeclResult | |||
4044 | Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc, | |||
4045 | SourceLocation TemplateNameLoc, | |||
4046 | const TemplateArgumentListInfo &TemplateArgs) { | |||
4047 | assert(Template && "A variable template id without template?")((Template && "A variable template id without template?" ) ? static_cast<void> (0) : __assert_fail ("Template && \"A variable template id without template?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 4047, __PRETTY_FUNCTION__)); | |||
4048 | ||||
4049 | // Check that the template argument list is well-formed for this template. | |||
4050 | SmallVector<TemplateArgument, 4> Converted; | |||
4051 | if (CheckTemplateArgumentList( | |||
4052 | Template, TemplateNameLoc, | |||
4053 | const_cast<TemplateArgumentListInfo &>(TemplateArgs), false, | |||
4054 | Converted)) | |||
4055 | return true; | |||
4056 | ||||
4057 | // Find the variable template specialization declaration that | |||
4058 | // corresponds to these arguments. | |||
4059 | void *InsertPos = nullptr; | |||
4060 | if (VarTemplateSpecializationDecl *Spec = Template->findSpecialization( | |||
4061 | Converted, InsertPos)) { | |||
4062 | checkSpecializationVisibility(TemplateNameLoc, Spec); | |||
4063 | // If we already have a variable template specialization, return it. | |||
4064 | return Spec; | |||
4065 | } | |||
4066 | ||||
4067 | // This is the first time we have referenced this variable template | |||
4068 | // specialization. Create the canonical declaration and add it to | |||
4069 | // the set of specializations, based on the closest partial specialization | |||
4070 | // that it represents. That is, | |||
4071 | VarDecl *InstantiationPattern = Template->getTemplatedDecl(); | |||
4072 | TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack, | |||
4073 | Converted); | |||
4074 | TemplateArgumentList *InstantiationArgs = &TemplateArgList; | |||
4075 | bool AmbiguousPartialSpec = false; | |||
4076 | typedef PartialSpecMatchResult MatchResult; | |||
4077 | SmallVector<MatchResult, 4> Matched; | |||
4078 | SourceLocation PointOfInstantiation = TemplateNameLoc; | |||
4079 | TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation, | |||
4080 | /*ForTakingAddress=*/false); | |||
4081 | ||||
4082 | // 1. Attempt to find the closest partial specialization that this | |||
4083 | // specializes, if any. | |||
4084 | // If any of the template arguments is dependent, then this is probably | |||
4085 | // a placeholder for an incomplete declarative context; which must be | |||
4086 | // complete by instantiation time. Thus, do not search through the partial | |||
4087 | // specializations yet. | |||
4088 | // TODO: Unify with InstantiateClassTemplateSpecialization()? | |||
4089 | // Perhaps better after unification of DeduceTemplateArguments() and | |||
4090 | // getMoreSpecializedPartialSpecialization(). | |||
4091 | bool InstantiationDependent = false; | |||
4092 | if (!TemplateSpecializationType::anyDependentTemplateArguments( | |||
4093 | TemplateArgs, InstantiationDependent)) { | |||
4094 | ||||
4095 | SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs; | |||
4096 | Template->getPartialSpecializations(PartialSpecs); | |||
4097 | ||||
4098 | for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { | |||
4099 | VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; | |||
4100 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); | |||
4101 | ||||
4102 | if (TemplateDeductionResult Result = | |||
4103 | DeduceTemplateArguments(Partial, TemplateArgList, Info)) { | |||
4104 | // Store the failed-deduction information for use in diagnostics, later. | |||
4105 | // TODO: Actually use the failed-deduction info? | |||
4106 | FailedCandidates.addCandidate().set( | |||
4107 | DeclAccessPair::make(Template, AS_public), Partial, | |||
4108 | MakeDeductionFailureInfo(Context, Result, Info)); | |||
4109 | (void)Result; | |||
4110 | } else { | |||
4111 | Matched.push_back(PartialSpecMatchResult()); | |||
4112 | Matched.back().Partial = Partial; | |||
4113 | Matched.back().Args = Info.take(); | |||
4114 | } | |||
4115 | } | |||
4116 | ||||
4117 | if (Matched.size() >= 1) { | |||
4118 | SmallVector<MatchResult, 4>::iterator Best = Matched.begin(); | |||
4119 | if (Matched.size() == 1) { | |||
4120 | // -- If exactly one matching specialization is found, the | |||
4121 | // instantiation is generated from that specialization. | |||
4122 | // We don't need to do anything for this. | |||
4123 | } else { | |||
4124 | // -- If more than one matching specialization is found, the | |||
4125 | // partial order rules (14.5.4.2) are used to determine | |||
4126 | // whether one of the specializations is more specialized | |||
4127 | // than the others. If none of the specializations is more | |||
4128 | // specialized than all of the other matching | |||
4129 | // specializations, then the use of the variable template is | |||
4130 | // ambiguous and the program is ill-formed. | |||
4131 | for (SmallVector<MatchResult, 4>::iterator P = Best + 1, | |||
4132 | PEnd = Matched.end(); | |||
4133 | P != PEnd; ++P) { | |||
4134 | if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial, | |||
4135 | PointOfInstantiation) == | |||
4136 | P->Partial) | |||
4137 | Best = P; | |||
4138 | } | |||
4139 | ||||
4140 | // Determine if the best partial specialization is more specialized than | |||
4141 | // the others. | |||
4142 | for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(), | |||
4143 | PEnd = Matched.end(); | |||
4144 | P != PEnd; ++P) { | |||
4145 | if (P != Best && getMoreSpecializedPartialSpecialization( | |||
4146 | P->Partial, Best->Partial, | |||
4147 | PointOfInstantiation) != Best->Partial) { | |||
4148 | AmbiguousPartialSpec = true; | |||
4149 | break; | |||
4150 | } | |||
4151 | } | |||
4152 | } | |||
4153 | ||||
4154 | // Instantiate using the best variable template partial specialization. | |||
4155 | InstantiationPattern = Best->Partial; | |||
4156 | InstantiationArgs = Best->Args; | |||
4157 | } else { | |||
4158 | // -- If no match is found, the instantiation is generated | |||
4159 | // from the primary template. | |||
4160 | // InstantiationPattern = Template->getTemplatedDecl(); | |||
4161 | } | |||
4162 | } | |||
4163 | ||||
4164 | // 2. Create the canonical declaration. | |||
4165 | // Note that we do not instantiate a definition until we see an odr-use | |||
4166 | // in DoMarkVarDeclReferenced(). | |||
4167 | // FIXME: LateAttrs et al.? | |||
4168 | VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation( | |||
4169 | Template, InstantiationPattern, *InstantiationArgs, TemplateArgs, | |||
4170 | Converted, TemplateNameLoc, InsertPos /*, LateAttrs, StartingScope*/); | |||
4171 | if (!Decl) | |||
4172 | return true; | |||
4173 | ||||
4174 | if (AmbiguousPartialSpec) { | |||
4175 | // Partial ordering did not produce a clear winner. Complain. | |||
4176 | Decl->setInvalidDecl(); | |||
4177 | Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous) | |||
4178 | << Decl; | |||
4179 | ||||
4180 | // Print the matching partial specializations. | |||
4181 | for (MatchResult P : Matched) | |||
4182 | Diag(P.Partial->getLocation(), diag::note_partial_spec_match) | |||
4183 | << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(), | |||
4184 | *P.Args); | |||
4185 | return true; | |||
4186 | } | |||
4187 | ||||
4188 | if (VarTemplatePartialSpecializationDecl *D = | |||
4189 | dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern)) | |||
4190 | Decl->setInstantiationOf(D, InstantiationArgs); | |||
4191 | ||||
4192 | checkSpecializationVisibility(TemplateNameLoc, Decl); | |||
4193 | ||||
4194 | assert(Decl && "No variable template specialization?")((Decl && "No variable template specialization?") ? static_cast <void> (0) : __assert_fail ("Decl && \"No variable template specialization?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 4194, __PRETTY_FUNCTION__)); | |||
4195 | return Decl; | |||
4196 | } | |||
4197 | ||||
4198 | ExprResult | |||
4199 | Sema::CheckVarTemplateId(const CXXScopeSpec &SS, | |||
4200 | const DeclarationNameInfo &NameInfo, | |||
4201 | VarTemplateDecl *Template, SourceLocation TemplateLoc, | |||
4202 | const TemplateArgumentListInfo *TemplateArgs) { | |||
4203 | ||||
4204 | DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(), | |||
4205 | *TemplateArgs); | |||
4206 | if (Decl.isInvalid()) | |||
4207 | return ExprError(); | |||
4208 | ||||
4209 | VarDecl *Var = cast<VarDecl>(Decl.get()); | |||
4210 | if (!Var->getTemplateSpecializationKind()) | |||
4211 | Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation, | |||
4212 | NameInfo.getLoc()); | |||
4213 | ||||
4214 | // Build an ordinary singleton decl ref. | |||
4215 | return BuildDeclarationNameExpr(SS, NameInfo, Var, | |||
4216 | /*FoundD=*/nullptr, TemplateArgs); | |||
4217 | } | |||
4218 | ||||
4219 | void Sema::diagnoseMissingTemplateArguments(TemplateName Name, | |||
4220 | SourceLocation Loc) { | |||
4221 | Diag(Loc, diag::err_template_missing_args) | |||
4222 | << (int)getTemplateNameKindForDiagnostics(Name) << Name; | |||
4223 | if (TemplateDecl *TD = Name.getAsTemplateDecl()) { | |||
4224 | Diag(TD->getLocation(), diag::note_template_decl_here) | |||
4225 | << TD->getTemplateParameters()->getSourceRange(); | |||
4226 | } | |||
4227 | } | |||
4228 | ||||
4229 | ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS, | |||
4230 | SourceLocation TemplateKWLoc, | |||
4231 | LookupResult &R, | |||
4232 | bool RequiresADL, | |||
4233 | const TemplateArgumentListInfo *TemplateArgs) { | |||
4234 | // FIXME: Can we do any checking at this point? I guess we could check the | |||
4235 | // template arguments that we have against the template name, if the template | |||
4236 | // name refers to a single template. That's not a terribly common case, | |||
4237 | // though. | |||
4238 | // foo<int> could identify a single function unambiguously | |||
4239 | // This approach does NOT work, since f<int>(1); | |||
4240 | // gets resolved prior to resorting to overload resolution | |||
4241 | // i.e., template<class T> void f(double); | |||
4242 | // vs template<class T, class U> void f(U); | |||
4243 | ||||
4244 | // These should be filtered out by our callers. | |||
4245 | assert(!R.isAmbiguous() && "ambiguous lookup when building templateid")((!R.isAmbiguous() && "ambiguous lookup when building templateid" ) ? static_cast<void> (0) : __assert_fail ("!R.isAmbiguous() && \"ambiguous lookup when building templateid\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 4245, __PRETTY_FUNCTION__)); | |||
4246 | ||||
4247 | // Non-function templates require a template argument list. | |||
4248 | if (auto *TD = R.getAsSingle<TemplateDecl>()) { | |||
4249 | if (!TemplateArgs && !isa<FunctionTemplateDecl>(TD)) { | |||
4250 | diagnoseMissingTemplateArguments(TemplateName(TD), R.getNameLoc()); | |||
4251 | return ExprError(); | |||
4252 | } | |||
4253 | } | |||
4254 | ||||
4255 | auto AnyDependentArguments = [&]() -> bool { | |||
4256 | bool InstantiationDependent; | |||
4257 | return TemplateArgs && | |||
4258 | TemplateSpecializationType::anyDependentTemplateArguments( | |||
4259 | *TemplateArgs, InstantiationDependent); | |||
4260 | }; | |||
4261 | ||||
4262 | // In C++1y, check variable template ids. | |||
4263 | if (R.getAsSingle<VarTemplateDecl>() && !AnyDependentArguments()) { | |||
4264 | return CheckVarTemplateId(SS, R.getLookupNameInfo(), | |||
4265 | R.getAsSingle<VarTemplateDecl>(), | |||
4266 | TemplateKWLoc, TemplateArgs); | |||
4267 | } | |||
4268 | ||||
4269 | // We don't want lookup warnings at this point. | |||
4270 | R.suppressDiagnostics(); | |||
4271 | ||||
4272 | UnresolvedLookupExpr *ULE | |||
4273 | = UnresolvedLookupExpr::Create(Context, R.getNamingClass(), | |||
4274 | SS.getWithLocInContext(Context), | |||
4275 | TemplateKWLoc, | |||
4276 | R.getLookupNameInfo(), | |||
4277 | RequiresADL, TemplateArgs, | |||
4278 | R.begin(), R.end()); | |||
4279 | ||||
4280 | return ULE; | |||
4281 | } | |||
4282 | ||||
4283 | // We actually only call this from template instantiation. | |||
4284 | ExprResult | |||
4285 | Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS, | |||
4286 | SourceLocation TemplateKWLoc, | |||
4287 | const DeclarationNameInfo &NameInfo, | |||
4288 | const TemplateArgumentListInfo *TemplateArgs) { | |||
4289 | ||||
4290 | assert(TemplateArgs || TemplateKWLoc.isValid())((TemplateArgs || TemplateKWLoc.isValid()) ? static_cast<void > (0) : __assert_fail ("TemplateArgs || TemplateKWLoc.isValid()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 4290, __PRETTY_FUNCTION__)); | |||
4291 | DeclContext *DC; | |||
4292 | if (!(DC = computeDeclContext(SS, false)) || | |||
4293 | DC->isDependentContext() || | |||
4294 | RequireCompleteDeclContext(SS, DC)) | |||
4295 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); | |||
4296 | ||||
4297 | bool MemberOfUnknownSpecialization; | |||
4298 | LookupResult R(*this, NameInfo, LookupOrdinaryName); | |||
4299 | if (LookupTemplateName(R, (Scope *)nullptr, SS, QualType(), | |||
4300 | /*Entering*/false, MemberOfUnknownSpecialization, | |||
4301 | TemplateKWLoc)) | |||
4302 | return ExprError(); | |||
4303 | ||||
4304 | if (R.isAmbiguous()) | |||
4305 | return ExprError(); | |||
4306 | ||||
4307 | if (R.empty()) { | |||
4308 | Diag(NameInfo.getLoc(), diag::err_no_member) | |||
4309 | << NameInfo.getName() << DC << SS.getRange(); | |||
4310 | return ExprError(); | |||
4311 | } | |||
4312 | ||||
4313 | if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) { | |||
4314 | Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template) | |||
4315 | << SS.getScopeRep() | |||
4316 | << NameInfo.getName().getAsString() << SS.getRange(); | |||
4317 | Diag(Temp->getLocation(), diag::note_referenced_class_template); | |||
4318 | return ExprError(); | |||
4319 | } | |||
4320 | ||||
4321 | return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs); | |||
4322 | } | |||
4323 | ||||
4324 | /// Form a dependent template name. | |||
4325 | /// | |||
4326 | /// This action forms a dependent template name given the template | |||
4327 | /// name and its (presumably dependent) scope specifier. For | |||
4328 | /// example, given "MetaFun::template apply", the scope specifier \p | |||
4329 | /// SS will be "MetaFun::", \p TemplateKWLoc contains the location | |||
4330 | /// of the "template" keyword, and "apply" is the \p Name. | |||
4331 | TemplateNameKind Sema::ActOnDependentTemplateName(Scope *S, | |||
4332 | CXXScopeSpec &SS, | |||
4333 | SourceLocation TemplateKWLoc, | |||
4334 | const UnqualifiedId &Name, | |||
4335 | ParsedType ObjectType, | |||
4336 | bool EnteringContext, | |||
4337 | TemplateTy &Result, | |||
4338 | bool AllowInjectedClassName) { | |||
4339 | if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent()) | |||
4340 | Diag(TemplateKWLoc, | |||
4341 | getLangOpts().CPlusPlus11 ? | |||
4342 | diag::warn_cxx98_compat_template_outside_of_template : | |||
4343 | diag::ext_template_outside_of_template) | |||
4344 | << FixItHint::CreateRemoval(TemplateKWLoc); | |||
4345 | ||||
4346 | DeclContext *LookupCtx = nullptr; | |||
4347 | if (SS.isSet()) | |||
4348 | LookupCtx = computeDeclContext(SS, EnteringContext); | |||
4349 | if (!LookupCtx && ObjectType) | |||
4350 | LookupCtx = computeDeclContext(ObjectType.get()); | |||
4351 | if (LookupCtx) { | |||
4352 | // C++0x [temp.names]p5: | |||
4353 | // If a name prefixed by the keyword template is not the name of | |||
4354 | // a template, the program is ill-formed. [Note: the keyword | |||
4355 | // template may not be applied to non-template members of class | |||
4356 | // templates. -end note ] [ Note: as is the case with the | |||
4357 | // typename prefix, the template prefix is allowed in cases | |||
4358 | // where it is not strictly necessary; i.e., when the | |||
4359 | // nested-name-specifier or the expression on the left of the -> | |||
4360 | // or . is not dependent on a template-parameter, or the use | |||
4361 | // does not appear in the scope of a template. -end note] | |||
4362 | // | |||
4363 | // Note: C++03 was more strict here, because it banned the use of | |||
4364 | // the "template" keyword prior to a template-name that was not a | |||
4365 | // dependent name. C++ DR468 relaxed this requirement (the | |||
4366 | // "template" keyword is now permitted). We follow the C++0x | |||
4367 | // rules, even in C++03 mode with a warning, retroactively applying the DR. | |||
4368 | bool MemberOfUnknownSpecialization; | |||
4369 | TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name, | |||
4370 | ObjectType, EnteringContext, Result, | |||
4371 | MemberOfUnknownSpecialization); | |||
4372 | if (TNK == TNK_Non_template && MemberOfUnknownSpecialization) { | |||
4373 | // This is a dependent template. Handle it below. | |||
4374 | } else if (TNK == TNK_Non_template) { | |||
4375 | // Do the lookup again to determine if this is a "nothing found" case or | |||
4376 | // a "not a template" case. FIXME: Refactor isTemplateName so we don't | |||
4377 | // need to do this. | |||
4378 | DeclarationNameInfo DNI = GetNameFromUnqualifiedId(Name); | |||
4379 | LookupResult R(*this, DNI.getName(), Name.getBeginLoc(), | |||
4380 | LookupOrdinaryName); | |||
4381 | bool MOUS; | |||
4382 | if (!LookupTemplateName(R, S, SS, ObjectType.get(), EnteringContext, | |||
4383 | MOUS, TemplateKWLoc) && !R.isAmbiguous()) | |||
4384 | Diag(Name.getBeginLoc(), diag::err_no_member) | |||
4385 | << DNI.getName() << LookupCtx << SS.getRange(); | |||
4386 | return TNK_Non_template; | |||
4387 | } else { | |||
4388 | // We found something; return it. | |||
4389 | auto *LookupRD = dyn_cast<CXXRecordDecl>(LookupCtx); | |||
4390 | if (!AllowInjectedClassName && SS.isSet() && LookupRD && | |||
4391 | Name.getKind() == UnqualifiedIdKind::IK_Identifier && | |||
4392 | Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) { | |||
4393 | // C++14 [class.qual]p2: | |||
4394 | // In a lookup in which function names are not ignored and the | |||
4395 | // nested-name-specifier nominates a class C, if the name specified | |||
4396 | // [...] is the injected-class-name of C, [...] the name is instead | |||
4397 | // considered to name the constructor | |||
4398 | // | |||
4399 | // We don't get here if naming the constructor would be valid, so we | |||
4400 | // just reject immediately and recover by treating the | |||
4401 | // injected-class-name as naming the template. | |||
4402 | Diag(Name.getBeginLoc(), | |||
4403 | diag::ext_out_of_line_qualified_id_type_names_constructor) | |||
4404 | << Name.Identifier | |||
4405 | << 0 /*injected-class-name used as template name*/ | |||
4406 | << 1 /*'template' keyword was used*/; | |||
4407 | } | |||
4408 | return TNK; | |||
4409 | } | |||
4410 | } | |||
4411 | ||||
4412 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); | |||
4413 | ||||
4414 | switch (Name.getKind()) { | |||
4415 | case UnqualifiedIdKind::IK_Identifier: | |||
4416 | Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier, | |||
4417 | Name.Identifier)); | |||
4418 | return TNK_Dependent_template_name; | |||
4419 | ||||
4420 | case UnqualifiedIdKind::IK_OperatorFunctionId: | |||
4421 | Result = TemplateTy::make(Context.getDependentTemplateName(Qualifier, | |||
4422 | Name.OperatorFunctionId.Operator)); | |||
4423 | return TNK_Function_template; | |||
4424 | ||||
4425 | case UnqualifiedIdKind::IK_LiteralOperatorId: | |||
4426 | llvm_unreachable("literal operator id cannot have a dependent scope")::llvm::llvm_unreachable_internal("literal operator id cannot have a dependent scope" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 4426); | |||
4427 | ||||
4428 | default: | |||
4429 | break; | |||
4430 | } | |||
4431 | ||||
4432 | Diag(Name.getBeginLoc(), diag::err_template_kw_refers_to_non_template) | |||
4433 | << GetNameFromUnqualifiedId(Name).getName() << Name.getSourceRange() | |||
4434 | << TemplateKWLoc; | |||
4435 | return TNK_Non_template; | |||
4436 | } | |||
4437 | ||||
4438 | bool Sema::CheckTemplateTypeArgument(TemplateTypeParmDecl *Param, | |||
4439 | TemplateArgumentLoc &AL, | |||
4440 | SmallVectorImpl<TemplateArgument> &Converted) { | |||
4441 | const TemplateArgument &Arg = AL.getArgument(); | |||
4442 | QualType ArgType; | |||
4443 | TypeSourceInfo *TSI = nullptr; | |||
4444 | ||||
4445 | // Check template type parameter. | |||
4446 | switch(Arg.getKind()) { | |||
4447 | case TemplateArgument::Type: | |||
4448 | // C++ [temp.arg.type]p1: | |||
4449 | // A template-argument for a template-parameter which is a | |||
4450 | // type shall be a type-id. | |||
4451 | ArgType = Arg.getAsType(); | |||
4452 | TSI = AL.getTypeSourceInfo(); | |||
4453 | break; | |||
4454 | case TemplateArgument::Template: | |||
4455 | case TemplateArgument::TemplateExpansion: { | |||
4456 | // We have a template type parameter but the template argument | |||
4457 | // is a template without any arguments. | |||
4458 | SourceRange SR = AL.getSourceRange(); | |||
4459 | TemplateName Name = Arg.getAsTemplateOrTemplatePattern(); | |||
4460 | diagnoseMissingTemplateArguments(Name, SR.getEnd()); | |||
4461 | return true; | |||
4462 | } | |||
4463 | case TemplateArgument::Expression: { | |||
4464 | // We have a template type parameter but the template argument is an | |||
4465 | // expression; see if maybe it is missing the "typename" keyword. | |||
4466 | CXXScopeSpec SS; | |||
4467 | DeclarationNameInfo NameInfo; | |||
4468 | ||||
4469 | if (DeclRefExpr *ArgExpr = dyn_cast<DeclRefExpr>(Arg.getAsExpr())) { | |||
4470 | SS.Adopt(ArgExpr->getQualifierLoc()); | |||
4471 | NameInfo = ArgExpr->getNameInfo(); | |||
4472 | } else if (DependentScopeDeclRefExpr *ArgExpr = | |||
4473 | dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) { | |||
4474 | SS.Adopt(ArgExpr->getQualifierLoc()); | |||
4475 | NameInfo = ArgExpr->getNameInfo(); | |||
4476 | } else if (CXXDependentScopeMemberExpr *ArgExpr = | |||
4477 | dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) { | |||
4478 | if (ArgExpr->isImplicitAccess()) { | |||
4479 | SS.Adopt(ArgExpr->getQualifierLoc()); | |||
4480 | NameInfo = ArgExpr->getMemberNameInfo(); | |||
4481 | } | |||
4482 | } | |||
4483 | ||||
4484 | if (auto *II = NameInfo.getName().getAsIdentifierInfo()) { | |||
4485 | LookupResult Result(*this, NameInfo, LookupOrdinaryName); | |||
4486 | LookupParsedName(Result, CurScope, &SS); | |||
4487 | ||||
4488 | if (Result.getAsSingle<TypeDecl>() || | |||
4489 | Result.getResultKind() == | |||
4490 | LookupResult::NotFoundInCurrentInstantiation) { | |||
4491 | // Suggest that the user add 'typename' before the NNS. | |||
4492 | SourceLocation Loc = AL.getSourceRange().getBegin(); | |||
4493 | Diag(Loc, getLangOpts().MSVCCompat | |||
4494 | ? diag::ext_ms_template_type_arg_missing_typename | |||
4495 | : diag::err_template_arg_must_be_type_suggest) | |||
4496 | << FixItHint::CreateInsertion(Loc, "typename "); | |||
4497 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
4498 | ||||
4499 | // Recover by synthesizing a type using the location information that we | |||
4500 | // already have. | |||
4501 | ArgType = | |||
4502 | Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II); | |||
4503 | TypeLocBuilder TLB; | |||
4504 | DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType); | |||
4505 | TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/)); | |||
4506 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
4507 | TL.setNameLoc(NameInfo.getLoc()); | |||
4508 | TSI = TLB.getTypeSourceInfo(Context, ArgType); | |||
4509 | ||||
4510 | // Overwrite our input TemplateArgumentLoc so that we can recover | |||
4511 | // properly. | |||
4512 | AL = TemplateArgumentLoc(TemplateArgument(ArgType), | |||
4513 | TemplateArgumentLocInfo(TSI)); | |||
4514 | ||||
4515 | break; | |||
4516 | } | |||
4517 | } | |||
4518 | // fallthrough | |||
4519 | LLVM_FALLTHROUGH[[clang::fallthrough]]; | |||
4520 | } | |||
4521 | default: { | |||
4522 | // We have a template type parameter but the template argument | |||
4523 | // is not a type. | |||
4524 | SourceRange SR = AL.getSourceRange(); | |||
4525 | Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR; | |||
4526 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
4527 | ||||
4528 | return true; | |||
4529 | } | |||
4530 | } | |||
4531 | ||||
4532 | if (CheckTemplateArgument(Param, TSI)) | |||
4533 | return true; | |||
4534 | ||||
4535 | // Add the converted template type argument. | |||
4536 | ArgType = Context.getCanonicalType(ArgType); | |||
4537 | ||||
4538 | // Objective-C ARC: | |||
4539 | // If an explicitly-specified template argument type is a lifetime type | |||
4540 | // with no lifetime qualifier, the __strong lifetime qualifier is inferred. | |||
4541 | if (getLangOpts().ObjCAutoRefCount && | |||
4542 | ArgType->isObjCLifetimeType() && | |||
4543 | !ArgType.getObjCLifetime()) { | |||
4544 | Qualifiers Qs; | |||
4545 | Qs.setObjCLifetime(Qualifiers::OCL_Strong); | |||
4546 | ArgType = Context.getQualifiedType(ArgType, Qs); | |||
4547 | } | |||
4548 | ||||
4549 | Converted.push_back(TemplateArgument(ArgType)); | |||
4550 | return false; | |||
4551 | } | |||
4552 | ||||
4553 | /// Substitute template arguments into the default template argument for | |||
4554 | /// the given template type parameter. | |||
4555 | /// | |||
4556 | /// \param SemaRef the semantic analysis object for which we are performing | |||
4557 | /// the substitution. | |||
4558 | /// | |||
4559 | /// \param Template the template that we are synthesizing template arguments | |||
4560 | /// for. | |||
4561 | /// | |||
4562 | /// \param TemplateLoc the location of the template name that started the | |||
4563 | /// template-id we are checking. | |||
4564 | /// | |||
4565 | /// \param RAngleLoc the location of the right angle bracket ('>') that | |||
4566 | /// terminates the template-id. | |||
4567 | /// | |||
4568 | /// \param Param the template template parameter whose default we are | |||
4569 | /// substituting into. | |||
4570 | /// | |||
4571 | /// \param Converted the list of template arguments provided for template | |||
4572 | /// parameters that precede \p Param in the template parameter list. | |||
4573 | /// \returns the substituted template argument, or NULL if an error occurred. | |||
4574 | static TypeSourceInfo * | |||
4575 | SubstDefaultTemplateArgument(Sema &SemaRef, | |||
4576 | TemplateDecl *Template, | |||
4577 | SourceLocation TemplateLoc, | |||
4578 | SourceLocation RAngleLoc, | |||
4579 | TemplateTypeParmDecl *Param, | |||
4580 | SmallVectorImpl<TemplateArgument> &Converted) { | |||
4581 | TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo(); | |||
4582 | ||||
4583 | // If the argument type is dependent, instantiate it now based | |||
4584 | // on the previously-computed template arguments. | |||
4585 | if (ArgType->getType()->isInstantiationDependentType()) { | |||
4586 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, | |||
4587 | Param, Template, Converted, | |||
4588 | SourceRange(TemplateLoc, RAngleLoc)); | |||
4589 | if (Inst.isInvalid()) | |||
4590 | return nullptr; | |||
4591 | ||||
4592 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); | |||
4593 | ||||
4594 | // Only substitute for the innermost template argument list. | |||
4595 | MultiLevelTemplateArgumentList TemplateArgLists; | |||
4596 | TemplateArgLists.addOuterTemplateArguments(&TemplateArgs); | |||
4597 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) | |||
4598 | TemplateArgLists.addOuterTemplateArguments(None); | |||
4599 | ||||
4600 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); | |||
4601 | ArgType = | |||
4602 | SemaRef.SubstType(ArgType, TemplateArgLists, | |||
4603 | Param->getDefaultArgumentLoc(), Param->getDeclName()); | |||
4604 | } | |||
4605 | ||||
4606 | return ArgType; | |||
4607 | } | |||
4608 | ||||
4609 | /// Substitute template arguments into the default template argument for | |||
4610 | /// the given non-type template parameter. | |||
4611 | /// | |||
4612 | /// \param SemaRef the semantic analysis object for which we are performing | |||
4613 | /// the substitution. | |||
4614 | /// | |||
4615 | /// \param Template the template that we are synthesizing template arguments | |||
4616 | /// for. | |||
4617 | /// | |||
4618 | /// \param TemplateLoc the location of the template name that started the | |||
4619 | /// template-id we are checking. | |||
4620 | /// | |||
4621 | /// \param RAngleLoc the location of the right angle bracket ('>') that | |||
4622 | /// terminates the template-id. | |||
4623 | /// | |||
4624 | /// \param Param the non-type template parameter whose default we are | |||
4625 | /// substituting into. | |||
4626 | /// | |||
4627 | /// \param Converted the list of template arguments provided for template | |||
4628 | /// parameters that precede \p Param in the template parameter list. | |||
4629 | /// | |||
4630 | /// \returns the substituted template argument, or NULL if an error occurred. | |||
4631 | static ExprResult | |||
4632 | SubstDefaultTemplateArgument(Sema &SemaRef, | |||
4633 | TemplateDecl *Template, | |||
4634 | SourceLocation TemplateLoc, | |||
4635 | SourceLocation RAngleLoc, | |||
4636 | NonTypeTemplateParmDecl *Param, | |||
4637 | SmallVectorImpl<TemplateArgument> &Converted) { | |||
4638 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, | |||
4639 | Param, Template, Converted, | |||
4640 | SourceRange(TemplateLoc, RAngleLoc)); | |||
4641 | if (Inst.isInvalid()) | |||
4642 | return ExprError(); | |||
4643 | ||||
4644 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); | |||
4645 | ||||
4646 | // Only substitute for the innermost template argument list. | |||
4647 | MultiLevelTemplateArgumentList TemplateArgLists; | |||
4648 | TemplateArgLists.addOuterTemplateArguments(&TemplateArgs); | |||
4649 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) | |||
4650 | TemplateArgLists.addOuterTemplateArguments(None); | |||
4651 | ||||
4652 | EnterExpressionEvaluationContext ConstantEvaluated( | |||
4653 | SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated); | |||
4654 | return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists); | |||
4655 | } | |||
4656 | ||||
4657 | /// Substitute template arguments into the default template argument for | |||
4658 | /// the given template template parameter. | |||
4659 | /// | |||
4660 | /// \param SemaRef the semantic analysis object for which we are performing | |||
4661 | /// the substitution. | |||
4662 | /// | |||
4663 | /// \param Template the template that we are synthesizing template arguments | |||
4664 | /// for. | |||
4665 | /// | |||
4666 | /// \param TemplateLoc the location of the template name that started the | |||
4667 | /// template-id we are checking. | |||
4668 | /// | |||
4669 | /// \param RAngleLoc the location of the right angle bracket ('>') that | |||
4670 | /// terminates the template-id. | |||
4671 | /// | |||
4672 | /// \param Param the template template parameter whose default we are | |||
4673 | /// substituting into. | |||
4674 | /// | |||
4675 | /// \param Converted the list of template arguments provided for template | |||
4676 | /// parameters that precede \p Param in the template parameter list. | |||
4677 | /// | |||
4678 | /// \param QualifierLoc Will be set to the nested-name-specifier (with | |||
4679 | /// source-location information) that precedes the template name. | |||
4680 | /// | |||
4681 | /// \returns the substituted template argument, or NULL if an error occurred. | |||
4682 | static TemplateName | |||
4683 | SubstDefaultTemplateArgument(Sema &SemaRef, | |||
4684 | TemplateDecl *Template, | |||
4685 | SourceLocation TemplateLoc, | |||
4686 | SourceLocation RAngleLoc, | |||
4687 | TemplateTemplateParmDecl *Param, | |||
4688 | SmallVectorImpl<TemplateArgument> &Converted, | |||
4689 | NestedNameSpecifierLoc &QualifierLoc) { | |||
4690 | Sema::InstantiatingTemplate Inst( | |||
4691 | SemaRef, TemplateLoc, TemplateParameter(Param), Template, Converted, | |||
4692 | SourceRange(TemplateLoc, RAngleLoc)); | |||
4693 | if (Inst.isInvalid()) | |||
4694 | return TemplateName(); | |||
4695 | ||||
4696 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); | |||
4697 | ||||
4698 | // Only substitute for the innermost template argument list. | |||
4699 | MultiLevelTemplateArgumentList TemplateArgLists; | |||
4700 | TemplateArgLists.addOuterTemplateArguments(&TemplateArgs); | |||
4701 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) | |||
4702 | TemplateArgLists.addOuterTemplateArguments(None); | |||
4703 | ||||
4704 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); | |||
4705 | // Substitute into the nested-name-specifier first, | |||
4706 | QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc(); | |||
4707 | if (QualifierLoc) { | |||
4708 | QualifierLoc = | |||
4709 | SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists); | |||
4710 | if (!QualifierLoc) | |||
4711 | return TemplateName(); | |||
4712 | } | |||
4713 | ||||
4714 | return SemaRef.SubstTemplateName( | |||
4715 | QualifierLoc, | |||
4716 | Param->getDefaultArgument().getArgument().getAsTemplate(), | |||
4717 | Param->getDefaultArgument().getTemplateNameLoc(), | |||
4718 | TemplateArgLists); | |||
4719 | } | |||
4720 | ||||
4721 | /// If the given template parameter has a default template | |||
4722 | /// argument, substitute into that default template argument and | |||
4723 | /// return the corresponding template argument. | |||
4724 | TemplateArgumentLoc | |||
4725 | Sema::SubstDefaultTemplateArgumentIfAvailable(TemplateDecl *Template, | |||
4726 | SourceLocation TemplateLoc, | |||
4727 | SourceLocation RAngleLoc, | |||
4728 | Decl *Param, | |||
4729 | SmallVectorImpl<TemplateArgument> | |||
4730 | &Converted, | |||
4731 | bool &HasDefaultArg) { | |||
4732 | HasDefaultArg = false; | |||
4733 | ||||
4734 | if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) { | |||
4735 | if (!hasVisibleDefaultArgument(TypeParm)) | |||
4736 | return TemplateArgumentLoc(); | |||
4737 | ||||
4738 | HasDefaultArg = true; | |||
4739 | TypeSourceInfo *DI = SubstDefaultTemplateArgument(*this, Template, | |||
4740 | TemplateLoc, | |||
4741 | RAngleLoc, | |||
4742 | TypeParm, | |||
4743 | Converted); | |||
4744 | if (DI) | |||
4745 | return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI); | |||
4746 | ||||
4747 | return TemplateArgumentLoc(); | |||
4748 | } | |||
4749 | ||||
4750 | if (NonTypeTemplateParmDecl *NonTypeParm | |||
4751 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { | |||
4752 | if (!hasVisibleDefaultArgument(NonTypeParm)) | |||
4753 | return TemplateArgumentLoc(); | |||
4754 | ||||
4755 | HasDefaultArg = true; | |||
4756 | ExprResult Arg = SubstDefaultTemplateArgument(*this, Template, | |||
4757 | TemplateLoc, | |||
4758 | RAngleLoc, | |||
4759 | NonTypeParm, | |||
4760 | Converted); | |||
4761 | if (Arg.isInvalid()) | |||
4762 | return TemplateArgumentLoc(); | |||
4763 | ||||
4764 | Expr *ArgE = Arg.getAs<Expr>(); | |||
4765 | return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE); | |||
4766 | } | |||
4767 | ||||
4768 | TemplateTemplateParmDecl *TempTempParm | |||
4769 | = cast<TemplateTemplateParmDecl>(Param); | |||
4770 | if (!hasVisibleDefaultArgument(TempTempParm)) | |||
4771 | return TemplateArgumentLoc(); | |||
4772 | ||||
4773 | HasDefaultArg = true; | |||
4774 | NestedNameSpecifierLoc QualifierLoc; | |||
4775 | TemplateName TName = SubstDefaultTemplateArgument(*this, Template, | |||
4776 | TemplateLoc, | |||
4777 | RAngleLoc, | |||
4778 | TempTempParm, | |||
4779 | Converted, | |||
4780 | QualifierLoc); | |||
4781 | if (TName.isNull()) | |||
4782 | return TemplateArgumentLoc(); | |||
4783 | ||||
4784 | return TemplateArgumentLoc(TemplateArgument(TName), | |||
4785 | TempTempParm->getDefaultArgument().getTemplateQualifierLoc(), | |||
4786 | TempTempParm->getDefaultArgument().getTemplateNameLoc()); | |||
4787 | } | |||
4788 | ||||
4789 | /// Convert a template-argument that we parsed as a type into a template, if | |||
4790 | /// possible. C++ permits injected-class-names to perform dual service as | |||
4791 | /// template template arguments and as template type arguments. | |||
4792 | static TemplateArgumentLoc convertTypeTemplateArgumentToTemplate(TypeLoc TLoc) { | |||
4793 | // Extract and step over any surrounding nested-name-specifier. | |||
4794 | NestedNameSpecifierLoc QualLoc; | |||
4795 | if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) { | |||
4796 | if (ETLoc.getTypePtr()->getKeyword() != ETK_None) | |||
4797 | return TemplateArgumentLoc(); | |||
4798 | ||||
4799 | QualLoc = ETLoc.getQualifierLoc(); | |||
4800 | TLoc = ETLoc.getNamedTypeLoc(); | |||
4801 | } | |||
4802 | ||||
4803 | // If this type was written as an injected-class-name, it can be used as a | |||
4804 | // template template argument. | |||
4805 | if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>()) | |||
4806 | return TemplateArgumentLoc(InjLoc.getTypePtr()->getTemplateName(), | |||
4807 | QualLoc, InjLoc.getNameLoc()); | |||
4808 | ||||
4809 | // If this type was written as an injected-class-name, it may have been | |||
4810 | // converted to a RecordType during instantiation. If the RecordType is | |||
4811 | // *not* wrapped in a TemplateSpecializationType and denotes a class | |||
4812 | // template specialization, it must have come from an injected-class-name. | |||
4813 | if (auto RecLoc = TLoc.getAs<RecordTypeLoc>()) | |||
4814 | if (auto *CTSD = | |||
4815 | dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl())) | |||
4816 | return TemplateArgumentLoc(TemplateName(CTSD->getSpecializedTemplate()), | |||
4817 | QualLoc, RecLoc.getNameLoc()); | |||
4818 | ||||
4819 | return TemplateArgumentLoc(); | |||
4820 | } | |||
4821 | ||||
4822 | /// Check that the given template argument corresponds to the given | |||
4823 | /// template parameter. | |||
4824 | /// | |||
4825 | /// \param Param The template parameter against which the argument will be | |||
4826 | /// checked. | |||
4827 | /// | |||
4828 | /// \param Arg The template argument, which may be updated due to conversions. | |||
4829 | /// | |||
4830 | /// \param Template The template in which the template argument resides. | |||
4831 | /// | |||
4832 | /// \param TemplateLoc The location of the template name for the template | |||
4833 | /// whose argument list we're matching. | |||
4834 | /// | |||
4835 | /// \param RAngleLoc The location of the right angle bracket ('>') that closes | |||
4836 | /// the template argument list. | |||
4837 | /// | |||
4838 | /// \param ArgumentPackIndex The index into the argument pack where this | |||
4839 | /// argument will be placed. Only valid if the parameter is a parameter pack. | |||
4840 | /// | |||
4841 | /// \param Converted The checked, converted argument will be added to the | |||
4842 | /// end of this small vector. | |||
4843 | /// | |||
4844 | /// \param CTAK Describes how we arrived at this particular template argument: | |||
4845 | /// explicitly written, deduced, etc. | |||
4846 | /// | |||
4847 | /// \returns true on error, false otherwise. | |||
4848 | bool Sema::CheckTemplateArgument(NamedDecl *Param, | |||
4849 | TemplateArgumentLoc &Arg, | |||
4850 | NamedDecl *Template, | |||
4851 | SourceLocation TemplateLoc, | |||
4852 | SourceLocation RAngleLoc, | |||
4853 | unsigned ArgumentPackIndex, | |||
4854 | SmallVectorImpl<TemplateArgument> &Converted, | |||
4855 | CheckTemplateArgumentKind CTAK) { | |||
4856 | // Check template type parameters. | |||
4857 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) | |||
4858 | return CheckTemplateTypeArgument(TTP, Arg, Converted); | |||
4859 | ||||
4860 | // Check non-type template parameters. | |||
4861 | if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) { | |||
4862 | // Do substitution on the type of the non-type template parameter | |||
4863 | // with the template arguments we've seen thus far. But if the | |||
4864 | // template has a dependent context then we cannot substitute yet. | |||
4865 | QualType NTTPType = NTTP->getType(); | |||
4866 | if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack()) | |||
4867 | NTTPType = NTTP->getExpansionType(ArgumentPackIndex); | |||
4868 | ||||
4869 | // FIXME: Do we need to substitute into parameters here if they're | |||
4870 | // instantiation-dependent but not dependent? | |||
4871 | if (NTTPType->isDependentType() && | |||
4872 | !isa<TemplateTemplateParmDecl>(Template) && | |||
4873 | !Template->getDeclContext()->isDependentContext()) { | |||
4874 | // Do substitution on the type of the non-type template parameter. | |||
4875 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, | |||
4876 | NTTP, Converted, | |||
4877 | SourceRange(TemplateLoc, RAngleLoc)); | |||
4878 | if (Inst.isInvalid()) | |||
4879 | return true; | |||
4880 | ||||
4881 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, | |||
4882 | Converted); | |||
4883 | NTTPType = SubstType(NTTPType, | |||
4884 | MultiLevelTemplateArgumentList(TemplateArgs), | |||
4885 | NTTP->getLocation(), | |||
4886 | NTTP->getDeclName()); | |||
4887 | // If that worked, check the non-type template parameter type | |||
4888 | // for validity. | |||
4889 | if (!NTTPType.isNull()) | |||
4890 | NTTPType = CheckNonTypeTemplateParameterType(NTTPType, | |||
4891 | NTTP->getLocation()); | |||
4892 | if (NTTPType.isNull()) | |||
4893 | return true; | |||
4894 | } | |||
4895 | ||||
4896 | switch (Arg.getArgument().getKind()) { | |||
4897 | case TemplateArgument::Null: | |||
4898 | llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 4898); | |||
4899 | ||||
4900 | case TemplateArgument::Expression: { | |||
4901 | TemplateArgument Result; | |||
4902 | unsigned CurSFINAEErrors = NumSFINAEErrors; | |||
4903 | ExprResult Res = | |||
4904 | CheckTemplateArgument(NTTP, NTTPType, Arg.getArgument().getAsExpr(), | |||
4905 | Result, CTAK); | |||
4906 | if (Res.isInvalid()) | |||
4907 | return true; | |||
4908 | // If the current template argument causes an error, give up now. | |||
4909 | if (CurSFINAEErrors < NumSFINAEErrors) | |||
4910 | return true; | |||
4911 | ||||
4912 | // If the resulting expression is new, then use it in place of the | |||
4913 | // old expression in the template argument. | |||
4914 | if (Res.get() != Arg.getArgument().getAsExpr()) { | |||
4915 | TemplateArgument TA(Res.get()); | |||
4916 | Arg = TemplateArgumentLoc(TA, Res.get()); | |||
4917 | } | |||
4918 | ||||
4919 | Converted.push_back(Result); | |||
4920 | break; | |||
4921 | } | |||
4922 | ||||
4923 | case TemplateArgument::Declaration: | |||
4924 | case TemplateArgument::Integral: | |||
4925 | case TemplateArgument::NullPtr: | |||
4926 | // We've already checked this template argument, so just copy | |||
4927 | // it to the list of converted arguments. | |||
4928 | Converted.push_back(Arg.getArgument()); | |||
4929 | break; | |||
4930 | ||||
4931 | case TemplateArgument::Template: | |||
4932 | case TemplateArgument::TemplateExpansion: | |||
4933 | // We were given a template template argument. It may not be ill-formed; | |||
4934 | // see below. | |||
4935 | if (DependentTemplateName *DTN | |||
4936 | = Arg.getArgument().getAsTemplateOrTemplatePattern() | |||
4937 | .getAsDependentTemplateName()) { | |||
4938 | // We have a template argument such as \c T::template X, which we | |||
4939 | // parsed as a template template argument. However, since we now | |||
4940 | // know that we need a non-type template argument, convert this | |||
4941 | // template name into an expression. | |||
4942 | ||||
4943 | DeclarationNameInfo NameInfo(DTN->getIdentifier(), | |||
4944 | Arg.getTemplateNameLoc()); | |||
4945 | ||||
4946 | CXXScopeSpec SS; | |||
4947 | SS.Adopt(Arg.getTemplateQualifierLoc()); | |||
4948 | // FIXME: the template-template arg was a DependentTemplateName, | |||
4949 | // so it was provided with a template keyword. However, its source | |||
4950 | // location is not stored in the template argument structure. | |||
4951 | SourceLocation TemplateKWLoc; | |||
4952 | ExprResult E = DependentScopeDeclRefExpr::Create( | |||
4953 | Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo, | |||
4954 | nullptr); | |||
4955 | ||||
4956 | // If we parsed the template argument as a pack expansion, create a | |||
4957 | // pack expansion expression. | |||
4958 | if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){ | |||
4959 | E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc()); | |||
4960 | if (E.isInvalid()) | |||
4961 | return true; | |||
4962 | } | |||
4963 | ||||
4964 | TemplateArgument Result; | |||
4965 | E = CheckTemplateArgument(NTTP, NTTPType, E.get(), Result); | |||
4966 | if (E.isInvalid()) | |||
4967 | return true; | |||
4968 | ||||
4969 | Converted.push_back(Result); | |||
4970 | break; | |||
4971 | } | |||
4972 | ||||
4973 | // We have a template argument that actually does refer to a class | |||
4974 | // template, alias template, or template template parameter, and | |||
4975 | // therefore cannot be a non-type template argument. | |||
4976 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr) | |||
4977 | << Arg.getSourceRange(); | |||
4978 | ||||
4979 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
4980 | return true; | |||
4981 | ||||
4982 | case TemplateArgument::Type: { | |||
4983 | // We have a non-type template parameter but the template | |||
4984 | // argument is a type. | |||
4985 | ||||
4986 | // C++ [temp.arg]p2: | |||
4987 | // In a template-argument, an ambiguity between a type-id and | |||
4988 | // an expression is resolved to a type-id, regardless of the | |||
4989 | // form of the corresponding template-parameter. | |||
4990 | // | |||
4991 | // We warn specifically about this case, since it can be rather | |||
4992 | // confusing for users. | |||
4993 | QualType T = Arg.getArgument().getAsType(); | |||
4994 | SourceRange SR = Arg.getSourceRange(); | |||
4995 | if (T->isFunctionType()) | |||
4996 | Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T; | |||
4997 | else | |||
4998 | Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR; | |||
4999 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
5000 | return true; | |||
5001 | } | |||
5002 | ||||
5003 | case TemplateArgument::Pack: | |||
5004 | llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5004); | |||
5005 | } | |||
5006 | ||||
5007 | return false; | |||
5008 | } | |||
5009 | ||||
5010 | ||||
5011 | // Check template template parameters. | |||
5012 | TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param); | |||
5013 | ||||
5014 | TemplateParameterList *Params = TempParm->getTemplateParameters(); | |||
5015 | if (TempParm->isExpandedParameterPack()) | |||
5016 | Params = TempParm->getExpansionTemplateParameters(ArgumentPackIndex); | |||
5017 | ||||
5018 | // Substitute into the template parameter list of the template | |||
5019 | // template parameter, since previously-supplied template arguments | |||
5020 | // may appear within the template template parameter. | |||
5021 | // | |||
5022 | // FIXME: Skip this if the parameters aren't instantiation-dependent. | |||
5023 | { | |||
5024 | // Set up a template instantiation context. | |||
5025 | LocalInstantiationScope Scope(*this); | |||
5026 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, | |||
5027 | TempParm, Converted, | |||
5028 | SourceRange(TemplateLoc, RAngleLoc)); | |||
5029 | if (Inst.isInvalid()) | |||
5030 | return true; | |||
5031 | ||||
5032 | TemplateArgumentList TemplateArgs(TemplateArgumentList::OnStack, Converted); | |||
5033 | Params = SubstTemplateParams(Params, CurContext, | |||
5034 | MultiLevelTemplateArgumentList(TemplateArgs)); | |||
5035 | if (!Params) | |||
5036 | return true; | |||
5037 | } | |||
5038 | ||||
5039 | // C++1z [temp.local]p1: (DR1004) | |||
5040 | // When [the injected-class-name] is used [...] as a template-argument for | |||
5041 | // a template template-parameter [...] it refers to the class template | |||
5042 | // itself. | |||
5043 | if (Arg.getArgument().getKind() == TemplateArgument::Type) { | |||
5044 | TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate( | |||
5045 | Arg.getTypeSourceInfo()->getTypeLoc()); | |||
5046 | if (!ConvertedArg.getArgument().isNull()) | |||
5047 | Arg = ConvertedArg; | |||
5048 | } | |||
5049 | ||||
5050 | switch (Arg.getArgument().getKind()) { | |||
5051 | case TemplateArgument::Null: | |||
5052 | llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5052); | |||
5053 | ||||
5054 | case TemplateArgument::Template: | |||
5055 | case TemplateArgument::TemplateExpansion: | |||
5056 | if (CheckTemplateTemplateArgument(Params, Arg)) | |||
5057 | return true; | |||
5058 | ||||
5059 | Converted.push_back(Arg.getArgument()); | |||
5060 | break; | |||
5061 | ||||
5062 | case TemplateArgument::Expression: | |||
5063 | case TemplateArgument::Type: | |||
5064 | // We have a template template parameter but the template | |||
5065 | // argument does not refer to a template. | |||
5066 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_template) | |||
5067 | << getLangOpts().CPlusPlus11; | |||
5068 | return true; | |||
5069 | ||||
5070 | case TemplateArgument::Declaration: | |||
5071 | llvm_unreachable("Declaration argument with template template parameter")::llvm::llvm_unreachable_internal("Declaration argument with template template parameter" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5071); | |||
5072 | case TemplateArgument::Integral: | |||
5073 | llvm_unreachable("Integral argument with template template parameter")::llvm::llvm_unreachable_internal("Integral argument with template template parameter" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5073); | |||
5074 | case TemplateArgument::NullPtr: | |||
5075 | llvm_unreachable("Null pointer argument with template template parameter")::llvm::llvm_unreachable_internal("Null pointer argument with template template parameter" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5075); | |||
5076 | ||||
5077 | case TemplateArgument::Pack: | |||
5078 | llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5078); | |||
5079 | } | |||
5080 | ||||
5081 | return false; | |||
5082 | } | |||
5083 | ||||
5084 | /// Check whether the template parameter is a pack expansion, and if so, | |||
5085 | /// determine the number of parameters produced by that expansion. For instance: | |||
5086 | /// | |||
5087 | /// \code | |||
5088 | /// template<typename ...Ts> struct A { | |||
5089 | /// template<Ts ...NTs, template<Ts> class ...TTs, typename ...Us> struct B; | |||
5090 | /// }; | |||
5091 | /// \endcode | |||
5092 | /// | |||
5093 | /// In \c A<int,int>::B, \c NTs and \c TTs have expanded pack size 2, and \c Us | |||
5094 | /// is not a pack expansion, so returns an empty Optional. | |||
5095 | static Optional<unsigned> getExpandedPackSize(NamedDecl *Param) { | |||
5096 | if (NonTypeTemplateParmDecl *NTTP | |||
5097 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { | |||
5098 | if (NTTP->isExpandedParameterPack()) | |||
5099 | return NTTP->getNumExpansionTypes(); | |||
5100 | } | |||
5101 | ||||
5102 | if (TemplateTemplateParmDecl *TTP | |||
5103 | = dyn_cast<TemplateTemplateParmDecl>(Param)) { | |||
5104 | if (TTP->isExpandedParameterPack()) | |||
5105 | return TTP->getNumExpansionTemplateParameters(); | |||
5106 | } | |||
5107 | ||||
5108 | return None; | |||
5109 | } | |||
5110 | ||||
5111 | /// Diagnose a missing template argument. | |||
5112 | template<typename TemplateParmDecl> | |||
5113 | static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc, | |||
5114 | TemplateDecl *TD, | |||
5115 | const TemplateParmDecl *D, | |||
5116 | TemplateArgumentListInfo &Args) { | |||
5117 | // Dig out the most recent declaration of the template parameter; there may be | |||
5118 | // declarations of the template that are more recent than TD. | |||
5119 | D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl()) | |||
5120 | ->getTemplateParameters() | |||
5121 | ->getParam(D->getIndex())); | |||
5122 | ||||
5123 | // If there's a default argument that's not visible, diagnose that we're | |||
5124 | // missing a module import. | |||
5125 | llvm::SmallVector<Module*, 8> Modules; | |||
5126 | if (D->hasDefaultArgument() && !S.hasVisibleDefaultArgument(D, &Modules)) { | |||
5127 | S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD), | |||
5128 | D->getDefaultArgumentLoc(), Modules, | |||
5129 | Sema::MissingImportKind::DefaultArgument, | |||
5130 | /*Recover*/true); | |||
5131 | return true; | |||
5132 | } | |||
5133 | ||||
5134 | // FIXME: If there's a more recent default argument that *is* visible, | |||
5135 | // diagnose that it was declared too late. | |||
5136 | ||||
5137 | TemplateParameterList *Params = TD->getTemplateParameters(); | |||
5138 | ||||
5139 | S.Diag(Loc, diag::err_template_arg_list_different_arity) | |||
5140 | << /*not enough args*/0 | |||
5141 | << (int)S.getTemplateNameKindForDiagnostics(TemplateName(TD)) | |||
5142 | << TD; | |||
5143 | S.Diag(TD->getLocation(), diag::note_template_decl_here) | |||
5144 | << Params->getSourceRange(); | |||
5145 | return true; | |||
5146 | } | |||
5147 | ||||
5148 | /// Check that the given template argument list is well-formed | |||
5149 | /// for specializing the given template. | |||
5150 | bool Sema::CheckTemplateArgumentList( | |||
5151 | TemplateDecl *Template, SourceLocation TemplateLoc, | |||
5152 | TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs, | |||
5153 | SmallVectorImpl<TemplateArgument> &Converted, | |||
5154 | bool UpdateArgsWithConversions) { | |||
5155 | // Make a copy of the template arguments for processing. Only make the | |||
5156 | // changes at the end when successful in matching the arguments to the | |||
5157 | // template. | |||
5158 | TemplateArgumentListInfo NewArgs = TemplateArgs; | |||
5159 | ||||
5160 | // Make sure we get the template parameter list from the most | |||
5161 | // recentdeclaration, since that is the only one that has is guaranteed to | |||
5162 | // have all the default template argument information. | |||
5163 | TemplateParameterList *Params = | |||
5164 | cast<TemplateDecl>(Template->getMostRecentDecl()) | |||
5165 | ->getTemplateParameters(); | |||
5166 | ||||
5167 | SourceLocation RAngleLoc = NewArgs.getRAngleLoc(); | |||
5168 | ||||
5169 | // C++ [temp.arg]p1: | |||
5170 | // [...] The type and form of each template-argument specified in | |||
5171 | // a template-id shall match the type and form specified for the | |||
5172 | // corresponding parameter declared by the template in its | |||
5173 | // template-parameter-list. | |||
5174 | bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template); | |||
5175 | SmallVector<TemplateArgument, 2> ArgumentPack; | |||
5176 | unsigned ArgIdx = 0, NumArgs = NewArgs.size(); | |||
5177 | LocalInstantiationScope InstScope(*this, true); | |||
5178 | for (TemplateParameterList::iterator Param = Params->begin(), | |||
5179 | ParamEnd = Params->end(); | |||
5180 | Param != ParamEnd; /* increment in loop */) { | |||
5181 | // If we have an expanded parameter pack, make sure we don't have too | |||
5182 | // many arguments. | |||
5183 | if (Optional<unsigned> Expansions = getExpandedPackSize(*Param)) { | |||
5184 | if (*Expansions == ArgumentPack.size()) { | |||
5185 | // We're done with this parameter pack. Pack up its arguments and add | |||
5186 | // them to the list. | |||
5187 | Converted.push_back( | |||
5188 | TemplateArgument::CreatePackCopy(Context, ArgumentPack)); | |||
5189 | ArgumentPack.clear(); | |||
5190 | ||||
5191 | // This argument is assigned to the next parameter. | |||
5192 | ++Param; | |||
5193 | continue; | |||
5194 | } else if (ArgIdx == NumArgs && !PartialTemplateArgs) { | |||
5195 | // Not enough arguments for this parameter pack. | |||
5196 | Diag(TemplateLoc, diag::err_template_arg_list_different_arity) | |||
5197 | << /*not enough args*/0 | |||
5198 | << (int)getTemplateNameKindForDiagnostics(TemplateName(Template)) | |||
5199 | << Template; | |||
5200 | Diag(Template->getLocation(), diag::note_template_decl_here) | |||
5201 | << Params->getSourceRange(); | |||
5202 | return true; | |||
5203 | } | |||
5204 | } | |||
5205 | ||||
5206 | if (ArgIdx < NumArgs) { | |||
5207 | // Check the template argument we were given. | |||
5208 | if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template, | |||
5209 | TemplateLoc, RAngleLoc, | |||
5210 | ArgumentPack.size(), Converted)) | |||
5211 | return true; | |||
5212 | ||||
5213 | bool PackExpansionIntoNonPack = | |||
5214 | NewArgs[ArgIdx].getArgument().isPackExpansion() && | |||
5215 | (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param)); | |||
5216 | if (PackExpansionIntoNonPack && isa<TypeAliasTemplateDecl>(Template)) { | |||
5217 | // Core issue 1430: we have a pack expansion as an argument to an | |||
5218 | // alias template, and it's not part of a parameter pack. This | |||
5219 | // can't be canonicalized, so reject it now. | |||
5220 | Diag(NewArgs[ArgIdx].getLocation(), | |||
5221 | diag::err_alias_template_expansion_into_fixed_list) | |||
5222 | << NewArgs[ArgIdx].getSourceRange(); | |||
5223 | Diag((*Param)->getLocation(), diag::note_template_param_here); | |||
5224 | return true; | |||
5225 | } | |||
5226 | ||||
5227 | // We're now done with this argument. | |||
5228 | ++ArgIdx; | |||
5229 | ||||
5230 | if ((*Param)->isTemplateParameterPack()) { | |||
5231 | // The template parameter was a template parameter pack, so take the | |||
5232 | // deduced argument and place it on the argument pack. Note that we | |||
5233 | // stay on the same template parameter so that we can deduce more | |||
5234 | // arguments. | |||
5235 | ArgumentPack.push_back(Converted.pop_back_val()); | |||
5236 | } else { | |||
5237 | // Move to the next template parameter. | |||
5238 | ++Param; | |||
5239 | } | |||
5240 | ||||
5241 | // If we just saw a pack expansion into a non-pack, then directly convert | |||
5242 | // the remaining arguments, because we don't know what parameters they'll | |||
5243 | // match up with. | |||
5244 | if (PackExpansionIntoNonPack) { | |||
5245 | if (!ArgumentPack.empty()) { | |||
5246 | // If we were part way through filling in an expanded parameter pack, | |||
5247 | // fall back to just producing individual arguments. | |||
5248 | Converted.insert(Converted.end(), | |||
5249 | ArgumentPack.begin(), ArgumentPack.end()); | |||
5250 | ArgumentPack.clear(); | |||
5251 | } | |||
5252 | ||||
5253 | while (ArgIdx < NumArgs) { | |||
5254 | Converted.push_back(NewArgs[ArgIdx].getArgument()); | |||
5255 | ++ArgIdx; | |||
5256 | } | |||
5257 | ||||
5258 | return false; | |||
5259 | } | |||
5260 | ||||
5261 | continue; | |||
5262 | } | |||
5263 | ||||
5264 | // If we're checking a partial template argument list, we're done. | |||
5265 | if (PartialTemplateArgs) { | |||
5266 | if ((*Param)->isTemplateParameterPack() && !ArgumentPack.empty()) | |||
5267 | Converted.push_back( | |||
5268 | TemplateArgument::CreatePackCopy(Context, ArgumentPack)); | |||
5269 | ||||
5270 | return false; | |||
5271 | } | |||
5272 | ||||
5273 | // If we have a template parameter pack with no more corresponding | |||
5274 | // arguments, just break out now and we'll fill in the argument pack below. | |||
5275 | if ((*Param)->isTemplateParameterPack()) { | |||
5276 | assert(!getExpandedPackSize(*Param) &&((!getExpandedPackSize(*Param) && "Should have dealt with this already" ) ? static_cast<void> (0) : __assert_fail ("!getExpandedPackSize(*Param) && \"Should have dealt with this already\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5277, __PRETTY_FUNCTION__)) | |||
5277 | "Should have dealt with this already")((!getExpandedPackSize(*Param) && "Should have dealt with this already" ) ? static_cast<void> (0) : __assert_fail ("!getExpandedPackSize(*Param) && \"Should have dealt with this already\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5277, __PRETTY_FUNCTION__)); | |||
5278 | ||||
5279 | // A non-expanded parameter pack before the end of the parameter list | |||
5280 | // only occurs for an ill-formed template parameter list, unless we've | |||
5281 | // got a partial argument list for a function template, so just bail out. | |||
5282 | if (Param + 1 != ParamEnd) | |||
5283 | return true; | |||
5284 | ||||
5285 | Converted.push_back( | |||
5286 | TemplateArgument::CreatePackCopy(Context, ArgumentPack)); | |||
5287 | ArgumentPack.clear(); | |||
5288 | ||||
5289 | ++Param; | |||
5290 | continue; | |||
5291 | } | |||
5292 | ||||
5293 | // Check whether we have a default argument. | |||
5294 | TemplateArgumentLoc Arg; | |||
5295 | ||||
5296 | // Retrieve the default template argument from the template | |||
5297 | // parameter. For each kind of template parameter, we substitute the | |||
5298 | // template arguments provided thus far and any "outer" template arguments | |||
5299 | // (when the template parameter was part of a nested template) into | |||
5300 | // the default argument. | |||
5301 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*Param)) { | |||
5302 | if (!hasVisibleDefaultArgument(TTP)) | |||
5303 | return diagnoseMissingArgument(*this, TemplateLoc, Template, TTP, | |||
5304 | NewArgs); | |||
5305 | ||||
5306 | TypeSourceInfo *ArgType = SubstDefaultTemplateArgument(*this, | |||
5307 | Template, | |||
5308 | TemplateLoc, | |||
5309 | RAngleLoc, | |||
5310 | TTP, | |||
5311 | Converted); | |||
5312 | if (!ArgType) | |||
5313 | return true; | |||
5314 | ||||
5315 | Arg = TemplateArgumentLoc(TemplateArgument(ArgType->getType()), | |||
5316 | ArgType); | |||
5317 | } else if (NonTypeTemplateParmDecl *NTTP | |||
5318 | = dyn_cast<NonTypeTemplateParmDecl>(*Param)) { | |||
5319 | if (!hasVisibleDefaultArgument(NTTP)) | |||
5320 | return diagnoseMissingArgument(*this, TemplateLoc, Template, NTTP, | |||
5321 | NewArgs); | |||
5322 | ||||
5323 | ExprResult E = SubstDefaultTemplateArgument(*this, Template, | |||
5324 | TemplateLoc, | |||
5325 | RAngleLoc, | |||
5326 | NTTP, | |||
5327 | Converted); | |||
5328 | if (E.isInvalid()) | |||
5329 | return true; | |||
5330 | ||||
5331 | Expr *Ex = E.getAs<Expr>(); | |||
5332 | Arg = TemplateArgumentLoc(TemplateArgument(Ex), Ex); | |||
5333 | } else { | |||
5334 | TemplateTemplateParmDecl *TempParm | |||
5335 | = cast<TemplateTemplateParmDecl>(*Param); | |||
5336 | ||||
5337 | if (!hasVisibleDefaultArgument(TempParm)) | |||
5338 | return diagnoseMissingArgument(*this, TemplateLoc, Template, TempParm, | |||
5339 | NewArgs); | |||
5340 | ||||
5341 | NestedNameSpecifierLoc QualifierLoc; | |||
5342 | TemplateName Name = SubstDefaultTemplateArgument(*this, Template, | |||
5343 | TemplateLoc, | |||
5344 | RAngleLoc, | |||
5345 | TempParm, | |||
5346 | Converted, | |||
5347 | QualifierLoc); | |||
5348 | if (Name.isNull()) | |||
5349 | return true; | |||
5350 | ||||
5351 | Arg = TemplateArgumentLoc(TemplateArgument(Name), QualifierLoc, | |||
5352 | TempParm->getDefaultArgument().getTemplateNameLoc()); | |||
5353 | } | |||
5354 | ||||
5355 | // Introduce an instantiation record that describes where we are using | |||
5356 | // the default template argument. We're not actually instantiating a | |||
5357 | // template here, we just create this object to put a note into the | |||
5358 | // context stack. | |||
5359 | InstantiatingTemplate Inst(*this, RAngleLoc, Template, *Param, Converted, | |||
5360 | SourceRange(TemplateLoc, RAngleLoc)); | |||
5361 | if (Inst.isInvalid()) | |||
5362 | return true; | |||
5363 | ||||
5364 | // Check the default template argument. | |||
5365 | if (CheckTemplateArgument(*Param, Arg, Template, TemplateLoc, | |||
5366 | RAngleLoc, 0, Converted)) | |||
5367 | return true; | |||
5368 | ||||
5369 | // Core issue 150 (assumed resolution): if this is a template template | |||
5370 | // parameter, keep track of the default template arguments from the | |||
5371 | // template definition. | |||
5372 | if (isTemplateTemplateParameter) | |||
5373 | NewArgs.addArgument(Arg); | |||
5374 | ||||
5375 | // Move to the next template parameter and argument. | |||
5376 | ++Param; | |||
5377 | ++ArgIdx; | |||
5378 | } | |||
5379 | ||||
5380 | // If we're performing a partial argument substitution, allow any trailing | |||
5381 | // pack expansions; they might be empty. This can happen even if | |||
5382 | // PartialTemplateArgs is false (the list of arguments is complete but | |||
5383 | // still dependent). | |||
5384 | if (ArgIdx < NumArgs && CurrentInstantiationScope && | |||
5385 | CurrentInstantiationScope->getPartiallySubstitutedPack()) { | |||
5386 | while (ArgIdx < NumArgs && NewArgs[ArgIdx].getArgument().isPackExpansion()) | |||
5387 | Converted.push_back(NewArgs[ArgIdx++].getArgument()); | |||
5388 | } | |||
5389 | ||||
5390 | // If we have any leftover arguments, then there were too many arguments. | |||
5391 | // Complain and fail. | |||
5392 | if (ArgIdx < NumArgs) { | |||
5393 | Diag(TemplateLoc, diag::err_template_arg_list_different_arity) | |||
5394 | << /*too many args*/1 | |||
5395 | << (int)getTemplateNameKindForDiagnostics(TemplateName(Template)) | |||
5396 | << Template | |||
5397 | << SourceRange(NewArgs[ArgIdx].getLocation(), NewArgs.getRAngleLoc()); | |||
5398 | Diag(Template->getLocation(), diag::note_template_decl_here) | |||
5399 | << Params->getSourceRange(); | |||
5400 | return true; | |||
5401 | } | |||
5402 | ||||
5403 | // No problems found with the new argument list, propagate changes back | |||
5404 | // to caller. | |||
5405 | if (UpdateArgsWithConversions) | |||
5406 | TemplateArgs = std::move(NewArgs); | |||
5407 | ||||
5408 | return false; | |||
5409 | } | |||
5410 | ||||
5411 | namespace { | |||
5412 | class UnnamedLocalNoLinkageFinder | |||
5413 | : public TypeVisitor<UnnamedLocalNoLinkageFinder, bool> | |||
5414 | { | |||
5415 | Sema &S; | |||
5416 | SourceRange SR; | |||
5417 | ||||
5418 | typedef TypeVisitor<UnnamedLocalNoLinkageFinder, bool> inherited; | |||
5419 | ||||
5420 | public: | |||
5421 | UnnamedLocalNoLinkageFinder(Sema &S, SourceRange SR) : S(S), SR(SR) { } | |||
5422 | ||||
5423 | bool Visit(QualType T) { | |||
5424 | return T.isNull() ? false : inherited::Visit(T.getTypePtr()); | |||
5425 | } | |||
5426 | ||||
5427 | #define TYPE(Class, Parent) \ | |||
5428 | bool Visit##Class##Type(const Class##Type *); | |||
5429 | #define ABSTRACT_TYPE(Class, Parent) \ | |||
5430 | bool Visit##Class##Type(const Class##Type *) { return false; } | |||
5431 | #define NON_CANONICAL_TYPE(Class, Parent) \ | |||
5432 | bool Visit##Class##Type(const Class##Type *) { return false; } | |||
5433 | #include "clang/AST/TypeNodes.def" | |||
5434 | ||||
5435 | bool VisitTagDecl(const TagDecl *Tag); | |||
5436 | bool VisitNestedNameSpecifier(NestedNameSpecifier *NNS); | |||
5437 | }; | |||
5438 | } // end anonymous namespace | |||
5439 | ||||
5440 | bool UnnamedLocalNoLinkageFinder::VisitBuiltinType(const BuiltinType*) { | |||
5441 | return false; | |||
5442 | } | |||
5443 | ||||
5444 | bool UnnamedLocalNoLinkageFinder::VisitComplexType(const ComplexType* T) { | |||
5445 | return Visit(T->getElementType()); | |||
5446 | } | |||
5447 | ||||
5448 | bool UnnamedLocalNoLinkageFinder::VisitPointerType(const PointerType* T) { | |||
5449 | return Visit(T->getPointeeType()); | |||
5450 | } | |||
5451 | ||||
5452 | bool UnnamedLocalNoLinkageFinder::VisitBlockPointerType( | |||
5453 | const BlockPointerType* T) { | |||
5454 | return Visit(T->getPointeeType()); | |||
5455 | } | |||
5456 | ||||
5457 | bool UnnamedLocalNoLinkageFinder::VisitLValueReferenceType( | |||
5458 | const LValueReferenceType* T) { | |||
5459 | return Visit(T->getPointeeType()); | |||
5460 | } | |||
5461 | ||||
5462 | bool UnnamedLocalNoLinkageFinder::VisitRValueReferenceType( | |||
5463 | const RValueReferenceType* T) { | |||
5464 | return Visit(T->getPointeeType()); | |||
5465 | } | |||
5466 | ||||
5467 | bool UnnamedLocalNoLinkageFinder::VisitMemberPointerType( | |||
5468 | const MemberPointerType* T) { | |||
5469 | return Visit(T->getPointeeType()) || Visit(QualType(T->getClass(), 0)); | |||
5470 | } | |||
5471 | ||||
5472 | bool UnnamedLocalNoLinkageFinder::VisitConstantArrayType( | |||
5473 | const ConstantArrayType* T) { | |||
5474 | return Visit(T->getElementType()); | |||
5475 | } | |||
5476 | ||||
5477 | bool UnnamedLocalNoLinkageFinder::VisitIncompleteArrayType( | |||
5478 | const IncompleteArrayType* T) { | |||
5479 | return Visit(T->getElementType()); | |||
5480 | } | |||
5481 | ||||
5482 | bool UnnamedLocalNoLinkageFinder::VisitVariableArrayType( | |||
5483 | const VariableArrayType* T) { | |||
5484 | return Visit(T->getElementType()); | |||
5485 | } | |||
5486 | ||||
5487 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedArrayType( | |||
5488 | const DependentSizedArrayType* T) { | |||
5489 | return Visit(T->getElementType()); | |||
5490 | } | |||
5491 | ||||
5492 | bool UnnamedLocalNoLinkageFinder::VisitDependentSizedExtVectorType( | |||
5493 | const DependentSizedExtVectorType* T) { | |||
5494 | return Visit(T->getElementType()); | |||
5495 | } | |||
5496 | ||||
5497 | bool UnnamedLocalNoLinkageFinder::VisitDependentAddressSpaceType( | |||
5498 | const DependentAddressSpaceType *T) { | |||
5499 | return Visit(T->getPointeeType()); | |||
5500 | } | |||
5501 | ||||
5502 | bool UnnamedLocalNoLinkageFinder::VisitVectorType(const VectorType* T) { | |||
5503 | return Visit(T->getElementType()); | |||
5504 | } | |||
5505 | ||||
5506 | bool UnnamedLocalNoLinkageFinder::VisitDependentVectorType( | |||
5507 | const DependentVectorType *T) { | |||
5508 | return Visit(T->getElementType()); | |||
5509 | } | |||
5510 | ||||
5511 | bool UnnamedLocalNoLinkageFinder::VisitExtVectorType(const ExtVectorType* T) { | |||
5512 | return Visit(T->getElementType()); | |||
5513 | } | |||
5514 | ||||
5515 | bool UnnamedLocalNoLinkageFinder::VisitFunctionProtoType( | |||
5516 | const FunctionProtoType* T) { | |||
5517 | for (const auto &A : T->param_types()) { | |||
5518 | if (Visit(A)) | |||
5519 | return true; | |||
5520 | } | |||
5521 | ||||
5522 | return Visit(T->getReturnType()); | |||
5523 | } | |||
5524 | ||||
5525 | bool UnnamedLocalNoLinkageFinder::VisitFunctionNoProtoType( | |||
5526 | const FunctionNoProtoType* T) { | |||
5527 | return Visit(T->getReturnType()); | |||
5528 | } | |||
5529 | ||||
5530 | bool UnnamedLocalNoLinkageFinder::VisitUnresolvedUsingType( | |||
5531 | const UnresolvedUsingType*) { | |||
5532 | return false; | |||
5533 | } | |||
5534 | ||||
5535 | bool UnnamedLocalNoLinkageFinder::VisitTypeOfExprType(const TypeOfExprType*) { | |||
5536 | return false; | |||
5537 | } | |||
5538 | ||||
5539 | bool UnnamedLocalNoLinkageFinder::VisitTypeOfType(const TypeOfType* T) { | |||
5540 | return Visit(T->getUnderlyingType()); | |||
5541 | } | |||
5542 | ||||
5543 | bool UnnamedLocalNoLinkageFinder::VisitDecltypeType(const DecltypeType*) { | |||
5544 | return false; | |||
5545 | } | |||
5546 | ||||
5547 | bool UnnamedLocalNoLinkageFinder::VisitUnaryTransformType( | |||
5548 | const UnaryTransformType*) { | |||
5549 | return false; | |||
5550 | } | |||
5551 | ||||
5552 | bool UnnamedLocalNoLinkageFinder::VisitAutoType(const AutoType *T) { | |||
5553 | return Visit(T->getDeducedType()); | |||
5554 | } | |||
5555 | ||||
5556 | bool UnnamedLocalNoLinkageFinder::VisitDeducedTemplateSpecializationType( | |||
5557 | const DeducedTemplateSpecializationType *T) { | |||
5558 | return Visit(T->getDeducedType()); | |||
5559 | } | |||
5560 | ||||
5561 | bool UnnamedLocalNoLinkageFinder::VisitRecordType(const RecordType* T) { | |||
5562 | return VisitTagDecl(T->getDecl()); | |||
5563 | } | |||
5564 | ||||
5565 | bool UnnamedLocalNoLinkageFinder::VisitEnumType(const EnumType* T) { | |||
5566 | return VisitTagDecl(T->getDecl()); | |||
5567 | } | |||
5568 | ||||
5569 | bool UnnamedLocalNoLinkageFinder::VisitTemplateTypeParmType( | |||
5570 | const TemplateTypeParmType*) { | |||
5571 | return false; | |||
5572 | } | |||
5573 | ||||
5574 | bool UnnamedLocalNoLinkageFinder::VisitSubstTemplateTypeParmPackType( | |||
5575 | const SubstTemplateTypeParmPackType *) { | |||
5576 | return false; | |||
5577 | } | |||
5578 | ||||
5579 | bool UnnamedLocalNoLinkageFinder::VisitTemplateSpecializationType( | |||
5580 | const TemplateSpecializationType*) { | |||
5581 | return false; | |||
5582 | } | |||
5583 | ||||
5584 | bool UnnamedLocalNoLinkageFinder::VisitInjectedClassNameType( | |||
5585 | const InjectedClassNameType* T) { | |||
5586 | return VisitTagDecl(T->getDecl()); | |||
5587 | } | |||
5588 | ||||
5589 | bool UnnamedLocalNoLinkageFinder::VisitDependentNameType( | |||
5590 | const DependentNameType* T) { | |||
5591 | return VisitNestedNameSpecifier(T->getQualifier()); | |||
5592 | } | |||
5593 | ||||
5594 | bool UnnamedLocalNoLinkageFinder::VisitDependentTemplateSpecializationType( | |||
5595 | const DependentTemplateSpecializationType* T) { | |||
5596 | return VisitNestedNameSpecifier(T->getQualifier()); | |||
5597 | } | |||
5598 | ||||
5599 | bool UnnamedLocalNoLinkageFinder::VisitPackExpansionType( | |||
5600 | const PackExpansionType* T) { | |||
5601 | return Visit(T->getPattern()); | |||
5602 | } | |||
5603 | ||||
5604 | bool UnnamedLocalNoLinkageFinder::VisitObjCObjectType(const ObjCObjectType *) { | |||
5605 | return false; | |||
5606 | } | |||
5607 | ||||
5608 | bool UnnamedLocalNoLinkageFinder::VisitObjCInterfaceType( | |||
5609 | const ObjCInterfaceType *) { | |||
5610 | return false; | |||
5611 | } | |||
5612 | ||||
5613 | bool UnnamedLocalNoLinkageFinder::VisitObjCObjectPointerType( | |||
5614 | const ObjCObjectPointerType *) { | |||
5615 | return false; | |||
5616 | } | |||
5617 | ||||
5618 | bool UnnamedLocalNoLinkageFinder::VisitAtomicType(const AtomicType* T) { | |||
5619 | return Visit(T->getValueType()); | |||
5620 | } | |||
5621 | ||||
5622 | bool UnnamedLocalNoLinkageFinder::VisitPipeType(const PipeType* T) { | |||
5623 | return false; | |||
5624 | } | |||
5625 | ||||
5626 | bool UnnamedLocalNoLinkageFinder::VisitTagDecl(const TagDecl *Tag) { | |||
5627 | if (Tag->getDeclContext()->isFunctionOrMethod()) { | |||
5628 | S.Diag(SR.getBegin(), | |||
5629 | S.getLangOpts().CPlusPlus11 ? | |||
5630 | diag::warn_cxx98_compat_template_arg_local_type : | |||
5631 | diag::ext_template_arg_local_type) | |||
5632 | << S.Context.getTypeDeclType(Tag) << SR; | |||
5633 | return true; | |||
5634 | } | |||
5635 | ||||
5636 | if (!Tag->hasNameForLinkage()) { | |||
5637 | S.Diag(SR.getBegin(), | |||
5638 | S.getLangOpts().CPlusPlus11 ? | |||
5639 | diag::warn_cxx98_compat_template_arg_unnamed_type : | |||
5640 | diag::ext_template_arg_unnamed_type) << SR; | |||
5641 | S.Diag(Tag->getLocation(), diag::note_template_unnamed_type_here); | |||
5642 | return true; | |||
5643 | } | |||
5644 | ||||
5645 | return false; | |||
5646 | } | |||
5647 | ||||
5648 | bool UnnamedLocalNoLinkageFinder::VisitNestedNameSpecifier( | |||
5649 | NestedNameSpecifier *NNS) { | |||
5650 | if (NNS->getPrefix() && VisitNestedNameSpecifier(NNS->getPrefix())) | |||
5651 | return true; | |||
5652 | ||||
5653 | switch (NNS->getKind()) { | |||
5654 | case NestedNameSpecifier::Identifier: | |||
5655 | case NestedNameSpecifier::Namespace: | |||
5656 | case NestedNameSpecifier::NamespaceAlias: | |||
5657 | case NestedNameSpecifier::Global: | |||
5658 | case NestedNameSpecifier::Super: | |||
5659 | return false; | |||
5660 | ||||
5661 | case NestedNameSpecifier::TypeSpec: | |||
5662 | case NestedNameSpecifier::TypeSpecWithTemplate: | |||
5663 | return Visit(QualType(NNS->getAsType(), 0)); | |||
5664 | } | |||
5665 | llvm_unreachable("Invalid NestedNameSpecifier::Kind!")::llvm::llvm_unreachable_internal("Invalid NestedNameSpecifier::Kind!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5665); | |||
5666 | } | |||
5667 | ||||
5668 | /// Check a template argument against its corresponding | |||
5669 | /// template type parameter. | |||
5670 | /// | |||
5671 | /// This routine implements the semantics of C++ [temp.arg.type]. It | |||
5672 | /// returns true if an error occurred, and false otherwise. | |||
5673 | bool Sema::CheckTemplateArgument(TemplateTypeParmDecl *Param, | |||
5674 | TypeSourceInfo *ArgInfo) { | |||
5675 | assert(ArgInfo && "invalid TypeSourceInfo")((ArgInfo && "invalid TypeSourceInfo") ? static_cast< void> (0) : __assert_fail ("ArgInfo && \"invalid TypeSourceInfo\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5675, __PRETTY_FUNCTION__)); | |||
5676 | QualType Arg = ArgInfo->getType(); | |||
5677 | SourceRange SR = ArgInfo->getTypeLoc().getSourceRange(); | |||
5678 | ||||
5679 | if (Arg->isVariablyModifiedType()) { | |||
5680 | return Diag(SR.getBegin(), diag::err_variably_modified_template_arg) << Arg; | |||
5681 | } else if (Context.hasSameUnqualifiedType(Arg, Context.OverloadTy)) { | |||
5682 | return Diag(SR.getBegin(), diag::err_template_arg_overload_type) << SR; | |||
5683 | } | |||
5684 | ||||
5685 | // C++03 [temp.arg.type]p2: | |||
5686 | // A local type, a type with no linkage, an unnamed type or a type | |||
5687 | // compounded from any of these types shall not be used as a | |||
5688 | // template-argument for a template type-parameter. | |||
5689 | // | |||
5690 | // C++11 allows these, and even in C++03 we allow them as an extension with | |||
5691 | // a warning. | |||
5692 | if (LangOpts.CPlusPlus11 || Arg->hasUnnamedOrLocalType()) { | |||
5693 | UnnamedLocalNoLinkageFinder Finder(*this, SR); | |||
5694 | (void)Finder.Visit(Context.getCanonicalType(Arg)); | |||
5695 | } | |||
5696 | ||||
5697 | return false; | |||
5698 | } | |||
5699 | ||||
5700 | enum NullPointerValueKind { | |||
5701 | NPV_NotNullPointer, | |||
5702 | NPV_NullPointer, | |||
5703 | NPV_Error | |||
5704 | }; | |||
5705 | ||||
5706 | /// Determine whether the given template argument is a null pointer | |||
5707 | /// value of the appropriate type. | |||
5708 | static NullPointerValueKind | |||
5709 | isNullPointerValueTemplateArgument(Sema &S, NonTypeTemplateParmDecl *Param, | |||
5710 | QualType ParamType, Expr *Arg, | |||
5711 | Decl *Entity = nullptr) { | |||
5712 | if (Arg->isValueDependent() || Arg->isTypeDependent()) | |||
5713 | return NPV_NotNullPointer; | |||
5714 | ||||
5715 | // dllimport'd entities aren't constant but are available inside of template | |||
5716 | // arguments. | |||
5717 | if (Entity && Entity->hasAttr<DLLImportAttr>()) | |||
5718 | return NPV_NotNullPointer; | |||
5719 | ||||
5720 | if (!S.isCompleteType(Arg->getExprLoc(), ParamType)) | |||
5721 | llvm_unreachable(::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5722) | |||
5722 | "Incomplete parameter type in isNullPointerValueTemplateArgument!")::llvm::llvm_unreachable_internal("Incomplete parameter type in isNullPointerValueTemplateArgument!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5722); | |||
5723 | ||||
5724 | if (!S.getLangOpts().CPlusPlus11) | |||
5725 | return NPV_NotNullPointer; | |||
5726 | ||||
5727 | // Determine whether we have a constant expression. | |||
5728 | ExprResult ArgRV = S.DefaultFunctionArrayConversion(Arg); | |||
5729 | if (ArgRV.isInvalid()) | |||
5730 | return NPV_Error; | |||
5731 | Arg = ArgRV.get(); | |||
5732 | ||||
5733 | Expr::EvalResult EvalResult; | |||
5734 | SmallVector<PartialDiagnosticAt, 8> Notes; | |||
5735 | EvalResult.Diag = &Notes; | |||
5736 | if (!Arg->EvaluateAsRValue(EvalResult, S.Context) || | |||
5737 | EvalResult.HasSideEffects) { | |||
5738 | SourceLocation DiagLoc = Arg->getExprLoc(); | |||
5739 | ||||
5740 | // If our only note is the usual "invalid subexpression" note, just point | |||
5741 | // the caret at its location rather than producing an essentially | |||
5742 | // redundant note. | |||
5743 | if (Notes.size() == 1 && Notes[0].second.getDiagID() == | |||
5744 | diag::note_invalid_subexpr_in_const_expr) { | |||
5745 | DiagLoc = Notes[0].first; | |||
5746 | Notes.clear(); | |||
5747 | } | |||
5748 | ||||
5749 | S.Diag(DiagLoc, diag::err_template_arg_not_address_constant) | |||
5750 | << Arg->getType() << Arg->getSourceRange(); | |||
5751 | for (unsigned I = 0, N = Notes.size(); I != N; ++I) | |||
5752 | S.Diag(Notes[I].first, Notes[I].second); | |||
5753 | ||||
5754 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
5755 | return NPV_Error; | |||
5756 | } | |||
5757 | ||||
5758 | // C++11 [temp.arg.nontype]p1: | |||
5759 | // - an address constant expression of type std::nullptr_t | |||
5760 | if (Arg->getType()->isNullPtrType()) | |||
5761 | return NPV_NullPointer; | |||
5762 | ||||
5763 | // - a constant expression that evaluates to a null pointer value (4.10); or | |||
5764 | // - a constant expression that evaluates to a null member pointer value | |||
5765 | // (4.11); or | |||
5766 | if ((EvalResult.Val.isLValue() && !EvalResult.Val.getLValueBase()) || | |||
5767 | (EvalResult.Val.isMemberPointer() && | |||
5768 | !EvalResult.Val.getMemberPointerDecl())) { | |||
5769 | // If our expression has an appropriate type, we've succeeded. | |||
5770 | bool ObjCLifetimeConversion; | |||
5771 | if (S.Context.hasSameUnqualifiedType(Arg->getType(), ParamType) || | |||
5772 | S.IsQualificationConversion(Arg->getType(), ParamType, false, | |||
5773 | ObjCLifetimeConversion)) | |||
5774 | return NPV_NullPointer; | |||
5775 | ||||
5776 | // The types didn't match, but we know we got a null pointer; complain, | |||
5777 | // then recover as if the types were correct. | |||
5778 | S.Diag(Arg->getExprLoc(), diag::err_template_arg_wrongtype_null_constant) | |||
5779 | << Arg->getType() << ParamType << Arg->getSourceRange(); | |||
5780 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
5781 | return NPV_NullPointer; | |||
5782 | } | |||
5783 | ||||
5784 | // If we don't have a null pointer value, but we do have a NULL pointer | |||
5785 | // constant, suggest a cast to the appropriate type. | |||
5786 | if (Arg->isNullPointerConstant(S.Context, Expr::NPC_NeverValueDependent)) { | |||
5787 | std::string Code = "static_cast<" + ParamType.getAsString() + ">("; | |||
5788 | S.Diag(Arg->getExprLoc(), diag::err_template_arg_untyped_null_constant) | |||
5789 | << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), Code) | |||
5790 | << FixItHint::CreateInsertion(S.getLocForEndOfToken(Arg->getEndLoc()), | |||
5791 | ")"); | |||
5792 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
5793 | return NPV_NullPointer; | |||
5794 | } | |||
5795 | ||||
5796 | // FIXME: If we ever want to support general, address-constant expressions | |||
5797 | // as non-type template arguments, we should return the ExprResult here to | |||
5798 | // be interpreted by the caller. | |||
5799 | return NPV_NotNullPointer; | |||
5800 | } | |||
5801 | ||||
5802 | /// Checks whether the given template argument is compatible with its | |||
5803 | /// template parameter. | |||
5804 | static bool CheckTemplateArgumentIsCompatibleWithParameter( | |||
5805 | Sema &S, NonTypeTemplateParmDecl *Param, QualType ParamType, Expr *ArgIn, | |||
5806 | Expr *Arg, QualType ArgType) { | |||
5807 | bool ObjCLifetimeConversion; | |||
5808 | if (ParamType->isPointerType() && | |||
5809 | !ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType() && | |||
5810 | S.IsQualificationConversion(ArgType, ParamType, false, | |||
5811 | ObjCLifetimeConversion)) { | |||
5812 | // For pointer-to-object types, qualification conversions are | |||
5813 | // permitted. | |||
5814 | } else { | |||
5815 | if (const ReferenceType *ParamRef = ParamType->getAs<ReferenceType>()) { | |||
5816 | if (!ParamRef->getPointeeType()->isFunctionType()) { | |||
5817 | // C++ [temp.arg.nontype]p5b3: | |||
5818 | // For a non-type template-parameter of type reference to | |||
5819 | // object, no conversions apply. The type referred to by the | |||
5820 | // reference may be more cv-qualified than the (otherwise | |||
5821 | // identical) type of the template- argument. The | |||
5822 | // template-parameter is bound directly to the | |||
5823 | // template-argument, which shall be an lvalue. | |||
5824 | ||||
5825 | // FIXME: Other qualifiers? | |||
5826 | unsigned ParamQuals = ParamRef->getPointeeType().getCVRQualifiers(); | |||
5827 | unsigned ArgQuals = ArgType.getCVRQualifiers(); | |||
5828 | ||||
5829 | if ((ParamQuals | ArgQuals) != ParamQuals) { | |||
5830 | S.Diag(Arg->getBeginLoc(), | |||
5831 | diag::err_template_arg_ref_bind_ignores_quals) | |||
5832 | << ParamType << Arg->getType() << Arg->getSourceRange(); | |||
5833 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
5834 | return true; | |||
5835 | } | |||
5836 | } | |||
5837 | } | |||
5838 | ||||
5839 | // At this point, the template argument refers to an object or | |||
5840 | // function with external linkage. We now need to check whether the | |||
5841 | // argument and parameter types are compatible. | |||
5842 | if (!S.Context.hasSameUnqualifiedType(ArgType, | |||
5843 | ParamType.getNonReferenceType())) { | |||
5844 | // We can't perform this conversion or binding. | |||
5845 | if (ParamType->isReferenceType()) | |||
5846 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_no_ref_bind) | |||
5847 | << ParamType << ArgIn->getType() << Arg->getSourceRange(); | |||
5848 | else | |||
5849 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible) | |||
5850 | << ArgIn->getType() << ParamType << Arg->getSourceRange(); | |||
5851 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
5852 | return true; | |||
5853 | } | |||
5854 | } | |||
5855 | ||||
5856 | return false; | |||
5857 | } | |||
5858 | ||||
5859 | /// Checks whether the given template argument is the address | |||
5860 | /// of an object or function according to C++ [temp.arg.nontype]p1. | |||
5861 | static bool | |||
5862 | CheckTemplateArgumentAddressOfObjectOrFunction(Sema &S, | |||
5863 | NonTypeTemplateParmDecl *Param, | |||
5864 | QualType ParamType, | |||
5865 | Expr *ArgIn, | |||
5866 | TemplateArgument &Converted) { | |||
5867 | bool Invalid = false; | |||
5868 | Expr *Arg = ArgIn; | |||
5869 | QualType ArgType = Arg->getType(); | |||
5870 | ||||
5871 | bool AddressTaken = false; | |||
5872 | SourceLocation AddrOpLoc; | |||
5873 | if (S.getLangOpts().MicrosoftExt) { | |||
5874 | // Microsoft Visual C++ strips all casts, allows an arbitrary number of | |||
5875 | // dereference and address-of operators. | |||
5876 | Arg = Arg->IgnoreParenCasts(); | |||
5877 | ||||
5878 | bool ExtWarnMSTemplateArg = false; | |||
5879 | UnaryOperatorKind FirstOpKind; | |||
5880 | SourceLocation FirstOpLoc; | |||
5881 | while (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { | |||
5882 | UnaryOperatorKind UnOpKind = UnOp->getOpcode(); | |||
5883 | if (UnOpKind == UO_Deref) | |||
5884 | ExtWarnMSTemplateArg = true; | |||
5885 | if (UnOpKind == UO_AddrOf || UnOpKind == UO_Deref) { | |||
5886 | Arg = UnOp->getSubExpr()->IgnoreParenCasts(); | |||
5887 | if (!AddrOpLoc.isValid()) { | |||
5888 | FirstOpKind = UnOpKind; | |||
5889 | FirstOpLoc = UnOp->getOperatorLoc(); | |||
5890 | } | |||
5891 | } else | |||
5892 | break; | |||
5893 | } | |||
5894 | if (FirstOpLoc.isValid()) { | |||
5895 | if (ExtWarnMSTemplateArg) | |||
5896 | S.Diag(ArgIn->getBeginLoc(), diag::ext_ms_deref_template_argument) | |||
5897 | << ArgIn->getSourceRange(); | |||
5898 | ||||
5899 | if (FirstOpKind == UO_AddrOf) | |||
5900 | AddressTaken = true; | |||
5901 | else if (Arg->getType()->isPointerType()) { | |||
5902 | // We cannot let pointers get dereferenced here, that is obviously not a | |||
5903 | // constant expression. | |||
5904 | assert(FirstOpKind == UO_Deref)((FirstOpKind == UO_Deref) ? static_cast<void> (0) : __assert_fail ("FirstOpKind == UO_Deref", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 5904, __PRETTY_FUNCTION__)); | |||
5905 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) | |||
5906 | << Arg->getSourceRange(); | |||
5907 | } | |||
5908 | } | |||
5909 | } else { | |||
5910 | // See through any implicit casts we added to fix the type. | |||
5911 | Arg = Arg->IgnoreImpCasts(); | |||
5912 | ||||
5913 | // C++ [temp.arg.nontype]p1: | |||
5914 | // | |||
5915 | // A template-argument for a non-type, non-template | |||
5916 | // template-parameter shall be one of: [...] | |||
5917 | // | |||
5918 | // -- the address of an object or function with external | |||
5919 | // linkage, including function templates and function | |||
5920 | // template-ids but excluding non-static class members, | |||
5921 | // expressed as & id-expression where the & is optional if | |||
5922 | // the name refers to a function or array, or if the | |||
5923 | // corresponding template-parameter is a reference; or | |||
5924 | ||||
5925 | // In C++98/03 mode, give an extension warning on any extra parentheses. | |||
5926 | // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 | |||
5927 | bool ExtraParens = false; | |||
5928 | while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { | |||
5929 | if (!Invalid && !ExtraParens) { | |||
5930 | S.Diag(Arg->getBeginLoc(), | |||
5931 | S.getLangOpts().CPlusPlus11 | |||
5932 | ? diag::warn_cxx98_compat_template_arg_extra_parens | |||
5933 | : diag::ext_template_arg_extra_parens) | |||
5934 | << Arg->getSourceRange(); | |||
5935 | ExtraParens = true; | |||
5936 | } | |||
5937 | ||||
5938 | Arg = Parens->getSubExpr(); | |||
5939 | } | |||
5940 | ||||
5941 | while (SubstNonTypeTemplateParmExpr *subst = | |||
5942 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) | |||
5943 | Arg = subst->getReplacement()->IgnoreImpCasts(); | |||
5944 | ||||
5945 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { | |||
5946 | if (UnOp->getOpcode() == UO_AddrOf) { | |||
5947 | Arg = UnOp->getSubExpr(); | |||
5948 | AddressTaken = true; | |||
5949 | AddrOpLoc = UnOp->getOperatorLoc(); | |||
5950 | } | |||
5951 | } | |||
5952 | ||||
5953 | while (SubstNonTypeTemplateParmExpr *subst = | |||
5954 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) | |||
5955 | Arg = subst->getReplacement()->IgnoreImpCasts(); | |||
5956 | } | |||
5957 | ||||
5958 | DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg); | |||
5959 | ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr; | |||
5960 | ||||
5961 | // If our parameter has pointer type, check for a null template value. | |||
5962 | if (ParamType->isPointerType() || ParamType->isNullPtrType()) { | |||
5963 | switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ArgIn, | |||
5964 | Entity)) { | |||
5965 | case NPV_NullPointer: | |||
5966 | S.Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); | |||
5967 | Converted = TemplateArgument(S.Context.getCanonicalType(ParamType), | |||
5968 | /*isNullPtr=*/true); | |||
5969 | return false; | |||
5970 | ||||
5971 | case NPV_Error: | |||
5972 | return true; | |||
5973 | ||||
5974 | case NPV_NotNullPointer: | |||
5975 | break; | |||
5976 | } | |||
5977 | } | |||
5978 | ||||
5979 | // Stop checking the precise nature of the argument if it is value dependent, | |||
5980 | // it should be checked when instantiated. | |||
5981 | if (Arg->isValueDependent()) { | |||
5982 | Converted = TemplateArgument(ArgIn); | |||
5983 | return false; | |||
5984 | } | |||
5985 | ||||
5986 | if (isa<CXXUuidofExpr>(Arg)) { | |||
5987 | if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, | |||
5988 | ArgIn, Arg, ArgType)) | |||
5989 | return true; | |||
5990 | ||||
5991 | Converted = TemplateArgument(ArgIn); | |||
5992 | return false; | |||
5993 | } | |||
5994 | ||||
5995 | if (!DRE) { | |||
5996 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) | |||
5997 | << Arg->getSourceRange(); | |||
5998 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
5999 | return true; | |||
6000 | } | |||
6001 | ||||
6002 | // Cannot refer to non-static data members | |||
6003 | if (isa<FieldDecl>(Entity) || isa<IndirectFieldDecl>(Entity)) { | |||
6004 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_field) | |||
6005 | << Entity << Arg->getSourceRange(); | |||
6006 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6007 | return true; | |||
6008 | } | |||
6009 | ||||
6010 | // Cannot refer to non-static member functions | |||
6011 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Entity)) { | |||
6012 | if (!Method->isStatic()) { | |||
6013 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_method) | |||
6014 | << Method << Arg->getSourceRange(); | |||
6015 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6016 | return true; | |||
6017 | } | |||
6018 | } | |||
6019 | ||||
6020 | FunctionDecl *Func = dyn_cast<FunctionDecl>(Entity); | |||
6021 | VarDecl *Var = dyn_cast<VarDecl>(Entity); | |||
6022 | ||||
6023 | // A non-type template argument must refer to an object or function. | |||
6024 | if (!Func && !Var) { | |||
6025 | // We found something, but we don't know specifically what it is. | |||
6026 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_object_or_func) | |||
6027 | << Arg->getSourceRange(); | |||
6028 | S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here); | |||
6029 | return true; | |||
6030 | } | |||
6031 | ||||
6032 | // Address / reference template args must have external linkage in C++98. | |||
6033 | if (Entity->getFormalLinkage() == InternalLinkage) { | |||
6034 | S.Diag(Arg->getBeginLoc(), | |||
6035 | S.getLangOpts().CPlusPlus11 | |||
6036 | ? diag::warn_cxx98_compat_template_arg_object_internal | |||
6037 | : diag::ext_template_arg_object_internal) | |||
6038 | << !Func << Entity << Arg->getSourceRange(); | |||
6039 | S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object) | |||
6040 | << !Func; | |||
6041 | } else if (!Entity->hasLinkage()) { | |||
6042 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_object_no_linkage) | |||
6043 | << !Func << Entity << Arg->getSourceRange(); | |||
6044 | S.Diag(Entity->getLocation(), diag::note_template_arg_internal_object) | |||
6045 | << !Func; | |||
6046 | return true; | |||
6047 | } | |||
6048 | ||||
6049 | if (Func) { | |||
6050 | // If the template parameter has pointer type, the function decays. | |||
6051 | if (ParamType->isPointerType() && !AddressTaken) | |||
6052 | ArgType = S.Context.getPointerType(Func->getType()); | |||
6053 | else if (AddressTaken && ParamType->isReferenceType()) { | |||
6054 | // If we originally had an address-of operator, but the | |||
6055 | // parameter has reference type, complain and (if things look | |||
6056 | // like they will work) drop the address-of operator. | |||
6057 | if (!S.Context.hasSameUnqualifiedType(Func->getType(), | |||
6058 | ParamType.getNonReferenceType())) { | |||
6059 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) | |||
6060 | << ParamType; | |||
6061 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6062 | return true; | |||
6063 | } | |||
6064 | ||||
6065 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) | |||
6066 | << ParamType | |||
6067 | << FixItHint::CreateRemoval(AddrOpLoc); | |||
6068 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6069 | ||||
6070 | ArgType = Func->getType(); | |||
6071 | } | |||
6072 | } else { | |||
6073 | // A value of reference type is not an object. | |||
6074 | if (Var->getType()->isReferenceType()) { | |||
6075 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_reference_var) | |||
6076 | << Var->getType() << Arg->getSourceRange(); | |||
6077 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6078 | return true; | |||
6079 | } | |||
6080 | ||||
6081 | // A template argument must have static storage duration. | |||
6082 | if (Var->getTLSKind()) { | |||
6083 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_thread_local) | |||
6084 | << Arg->getSourceRange(); | |||
6085 | S.Diag(Var->getLocation(), diag::note_template_arg_refers_here); | |||
6086 | return true; | |||
6087 | } | |||
6088 | ||||
6089 | // If the template parameter has pointer type, we must have taken | |||
6090 | // the address of this object. | |||
6091 | if (ParamType->isReferenceType()) { | |||
6092 | if (AddressTaken) { | |||
6093 | // If we originally had an address-of operator, but the | |||
6094 | // parameter has reference type, complain and (if things look | |||
6095 | // like they will work) drop the address-of operator. | |||
6096 | if (!S.Context.hasSameUnqualifiedType(Var->getType(), | |||
6097 | ParamType.getNonReferenceType())) { | |||
6098 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) | |||
6099 | << ParamType; | |||
6100 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6101 | return true; | |||
6102 | } | |||
6103 | ||||
6104 | S.Diag(AddrOpLoc, diag::err_template_arg_address_of_non_pointer) | |||
6105 | << ParamType | |||
6106 | << FixItHint::CreateRemoval(AddrOpLoc); | |||
6107 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6108 | ||||
6109 | ArgType = Var->getType(); | |||
6110 | } | |||
6111 | } else if (!AddressTaken && ParamType->isPointerType()) { | |||
6112 | if (Var->getType()->isArrayType()) { | |||
6113 | // Array-to-pointer decay. | |||
6114 | ArgType = S.Context.getArrayDecayedType(Var->getType()); | |||
6115 | } else { | |||
6116 | // If the template parameter has pointer type but the address of | |||
6117 | // this object was not taken, complain and (possibly) recover by | |||
6118 | // taking the address of the entity. | |||
6119 | ArgType = S.Context.getPointerType(Var->getType()); | |||
6120 | if (!S.Context.hasSameUnqualifiedType(ArgType, ParamType)) { | |||
6121 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of) | |||
6122 | << ParamType; | |||
6123 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6124 | return true; | |||
6125 | } | |||
6126 | ||||
6127 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_address_of) | |||
6128 | << ParamType << FixItHint::CreateInsertion(Arg->getBeginLoc(), "&"); | |||
6129 | ||||
6130 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6131 | } | |||
6132 | } | |||
6133 | } | |||
6134 | ||||
6135 | if (CheckTemplateArgumentIsCompatibleWithParameter(S, Param, ParamType, ArgIn, | |||
6136 | Arg, ArgType)) | |||
6137 | return true; | |||
6138 | ||||
6139 | // Create the template argument. | |||
6140 | Converted = | |||
6141 | TemplateArgument(cast<ValueDecl>(Entity->getCanonicalDecl()), ParamType); | |||
6142 | S.MarkAnyDeclReferenced(Arg->getBeginLoc(), Entity, false); | |||
6143 | return false; | |||
6144 | } | |||
6145 | ||||
6146 | /// Checks whether the given template argument is a pointer to | |||
6147 | /// member constant according to C++ [temp.arg.nontype]p1. | |||
6148 | static bool CheckTemplateArgumentPointerToMember(Sema &S, | |||
6149 | NonTypeTemplateParmDecl *Param, | |||
6150 | QualType ParamType, | |||
6151 | Expr *&ResultArg, | |||
6152 | TemplateArgument &Converted) { | |||
6153 | bool Invalid = false; | |||
6154 | ||||
6155 | Expr *Arg = ResultArg; | |||
6156 | bool ObjCLifetimeConversion; | |||
6157 | ||||
6158 | // C++ [temp.arg.nontype]p1: | |||
6159 | // | |||
6160 | // A template-argument for a non-type, non-template | |||
6161 | // template-parameter shall be one of: [...] | |||
6162 | // | |||
6163 | // -- a pointer to member expressed as described in 5.3.1. | |||
6164 | DeclRefExpr *DRE = nullptr; | |||
6165 | ||||
6166 | // In C++98/03 mode, give an extension warning on any extra parentheses. | |||
6167 | // See http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#773 | |||
6168 | bool ExtraParens = false; | |||
6169 | while (ParenExpr *Parens = dyn_cast<ParenExpr>(Arg)) { | |||
6170 | if (!Invalid && !ExtraParens) { | |||
6171 | S.Diag(Arg->getBeginLoc(), | |||
6172 | S.getLangOpts().CPlusPlus11 | |||
6173 | ? diag::warn_cxx98_compat_template_arg_extra_parens | |||
6174 | : diag::ext_template_arg_extra_parens) | |||
6175 | << Arg->getSourceRange(); | |||
6176 | ExtraParens = true; | |||
6177 | } | |||
6178 | ||||
6179 | Arg = Parens->getSubExpr(); | |||
6180 | } | |||
6181 | ||||
6182 | while (SubstNonTypeTemplateParmExpr *subst = | |||
6183 | dyn_cast<SubstNonTypeTemplateParmExpr>(Arg)) | |||
6184 | Arg = subst->getReplacement()->IgnoreImpCasts(); | |||
6185 | ||||
6186 | // A pointer-to-member constant written &Class::member. | |||
6187 | if (UnaryOperator *UnOp = dyn_cast<UnaryOperator>(Arg)) { | |||
6188 | if (UnOp->getOpcode() == UO_AddrOf) { | |||
6189 | DRE = dyn_cast<DeclRefExpr>(UnOp->getSubExpr()); | |||
6190 | if (DRE && !DRE->getQualifier()) | |||
6191 | DRE = nullptr; | |||
6192 | } | |||
6193 | } | |||
6194 | // A constant of pointer-to-member type. | |||
6195 | else if ((DRE = dyn_cast<DeclRefExpr>(Arg))) { | |||
6196 | ValueDecl *VD = DRE->getDecl(); | |||
6197 | if (VD->getType()->isMemberPointerType()) { | |||
6198 | if (isa<NonTypeTemplateParmDecl>(VD)) { | |||
6199 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { | |||
6200 | Converted = TemplateArgument(Arg); | |||
6201 | } else { | |||
6202 | VD = cast<ValueDecl>(VD->getCanonicalDecl()); | |||
6203 | Converted = TemplateArgument(VD, ParamType); | |||
6204 | } | |||
6205 | return Invalid; | |||
6206 | } | |||
6207 | } | |||
6208 | ||||
6209 | DRE = nullptr; | |||
6210 | } | |||
6211 | ||||
6212 | ValueDecl *Entity = DRE ? DRE->getDecl() : nullptr; | |||
6213 | ||||
6214 | // Check for a null pointer value. | |||
6215 | switch (isNullPointerValueTemplateArgument(S, Param, ParamType, ResultArg, | |||
6216 | Entity)) { | |||
6217 | case NPV_Error: | |||
6218 | return true; | |||
6219 | case NPV_NullPointer: | |||
6220 | S.Diag(ResultArg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); | |||
6221 | Converted = TemplateArgument(S.Context.getCanonicalType(ParamType), | |||
6222 | /*isNullPtr*/true); | |||
6223 | return false; | |||
6224 | case NPV_NotNullPointer: | |||
6225 | break; | |||
6226 | } | |||
6227 | ||||
6228 | if (S.IsQualificationConversion(ResultArg->getType(), | |||
6229 | ParamType.getNonReferenceType(), false, | |||
6230 | ObjCLifetimeConversion)) { | |||
6231 | ResultArg = S.ImpCastExprToType(ResultArg, ParamType, CK_NoOp, | |||
6232 | ResultArg->getValueKind()) | |||
6233 | .get(); | |||
6234 | } else if (!S.Context.hasSameUnqualifiedType( | |||
6235 | ResultArg->getType(), ParamType.getNonReferenceType())) { | |||
6236 | // We can't perform this conversion. | |||
6237 | S.Diag(ResultArg->getBeginLoc(), diag::err_template_arg_not_convertible) | |||
6238 | << ResultArg->getType() << ParamType << ResultArg->getSourceRange(); | |||
6239 | S.Diag(Param->getLocation(), diag::note_template_param_here); | |||
6240 | return true; | |||
6241 | } | |||
6242 | ||||
6243 | if (!DRE) | |||
6244 | return S.Diag(Arg->getBeginLoc(), | |||
6245 | diag::err_template_arg_not_pointer_to_member_form) | |||
6246 | << Arg->getSourceRange(); | |||
6247 | ||||
6248 | if (isa<FieldDecl>(DRE->getDecl()) || | |||
6249 | isa<IndirectFieldDecl>(DRE->getDecl()) || | |||
6250 | isa<CXXMethodDecl>(DRE->getDecl())) { | |||
6251 | assert((isa<FieldDecl>(DRE->getDecl()) ||(((isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl >(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE-> getDecl())->isStatic()) && "Only non-static member pointers can make it here" ) ? static_cast<void> (0) : __assert_fail ("(isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) && \"Only non-static member pointers can make it here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6254, __PRETTY_FUNCTION__)) | |||
6252 | isa<IndirectFieldDecl>(DRE->getDecl()) ||(((isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl >(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE-> getDecl())->isStatic()) && "Only non-static member pointers can make it here" ) ? static_cast<void> (0) : __assert_fail ("(isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) && \"Only non-static member pointers can make it here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6254, __PRETTY_FUNCTION__)) | |||
6253 | !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) &&(((isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl >(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE-> getDecl())->isStatic()) && "Only non-static member pointers can make it here" ) ? static_cast<void> (0) : __assert_fail ("(isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) && \"Only non-static member pointers can make it here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6254, __PRETTY_FUNCTION__)) | |||
6254 | "Only non-static member pointers can make it here")(((isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl >(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE-> getDecl())->isStatic()) && "Only non-static member pointers can make it here" ) ? static_cast<void> (0) : __assert_fail ("(isa<FieldDecl>(DRE->getDecl()) || isa<IndirectFieldDecl>(DRE->getDecl()) || !cast<CXXMethodDecl>(DRE->getDecl())->isStatic()) && \"Only non-static member pointers can make it here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6254, __PRETTY_FUNCTION__)); | |||
6255 | ||||
6256 | // Okay: this is the address of a non-static member, and therefore | |||
6257 | // a member pointer constant. | |||
6258 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { | |||
6259 | Converted = TemplateArgument(Arg); | |||
6260 | } else { | |||
6261 | ValueDecl *D = cast<ValueDecl>(DRE->getDecl()->getCanonicalDecl()); | |||
6262 | Converted = TemplateArgument(D, ParamType); | |||
6263 | } | |||
6264 | return Invalid; | |||
6265 | } | |||
6266 | ||||
6267 | // We found something else, but we don't know specifically what it is. | |||
6268 | S.Diag(Arg->getBeginLoc(), diag::err_template_arg_not_pointer_to_member_form) | |||
6269 | << Arg->getSourceRange(); | |||
6270 | S.Diag(DRE->getDecl()->getLocation(), diag::note_template_arg_refers_here); | |||
6271 | return true; | |||
6272 | } | |||
6273 | ||||
6274 | /// Check a template argument against its corresponding | |||
6275 | /// non-type template parameter. | |||
6276 | /// | |||
6277 | /// This routine implements the semantics of C++ [temp.arg.nontype]. | |||
6278 | /// If an error occurred, it returns ExprError(); otherwise, it | |||
6279 | /// returns the converted template argument. \p ParamType is the | |||
6280 | /// type of the non-type template parameter after it has been instantiated. | |||
6281 | ExprResult Sema::CheckTemplateArgument(NonTypeTemplateParmDecl *Param, | |||
6282 | QualType ParamType, Expr *Arg, | |||
6283 | TemplateArgument &Converted, | |||
6284 | CheckTemplateArgumentKind CTAK) { | |||
6285 | SourceLocation StartLoc = Arg->getBeginLoc(); | |||
6286 | ||||
6287 | // If the parameter type somehow involves auto, deduce the type now. | |||
6288 | if (getLangOpts().CPlusPlus17 && ParamType->isUndeducedType()) { | |||
6289 | // During template argument deduction, we allow 'decltype(auto)' to | |||
6290 | // match an arbitrary dependent argument. | |||
6291 | // FIXME: The language rules don't say what happens in this case. | |||
6292 | // FIXME: We get an opaque dependent type out of decltype(auto) if the | |||
6293 | // expression is merely instantiation-dependent; is this enough? | |||
6294 | if (CTAK == CTAK_Deduced && Arg->isTypeDependent()) { | |||
6295 | auto *AT = dyn_cast<AutoType>(ParamType); | |||
6296 | if (AT && AT->isDecltypeAuto()) { | |||
6297 | Converted = TemplateArgument(Arg); | |||
6298 | return Arg; | |||
6299 | } | |||
6300 | } | |||
6301 | ||||
6302 | // When checking a deduced template argument, deduce from its type even if | |||
6303 | // the type is dependent, in order to check the types of non-type template | |||
6304 | // arguments line up properly in partial ordering. | |||
6305 | Optional<unsigned> Depth; | |||
6306 | if (CTAK != CTAK_Specified) | |||
6307 | Depth = Param->getDepth() + 1; | |||
6308 | if (DeduceAutoType( | |||
6309 | Context.getTrivialTypeSourceInfo(ParamType, Param->getLocation()), | |||
6310 | Arg, ParamType, Depth) == DAR_Failed) { | |||
6311 | Diag(Arg->getExprLoc(), | |||
6312 | diag::err_non_type_template_parm_type_deduction_failure) | |||
6313 | << Param->getDeclName() << Param->getType() << Arg->getType() | |||
6314 | << Arg->getSourceRange(); | |||
6315 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6316 | return ExprError(); | |||
6317 | } | |||
6318 | // CheckNonTypeTemplateParameterType will produce a diagnostic if there's | |||
6319 | // an error. The error message normally references the parameter | |||
6320 | // declaration, but here we'll pass the argument location because that's | |||
6321 | // where the parameter type is deduced. | |||
6322 | ParamType = CheckNonTypeTemplateParameterType(ParamType, Arg->getExprLoc()); | |||
6323 | if (ParamType.isNull()) { | |||
6324 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6325 | return ExprError(); | |||
6326 | } | |||
6327 | } | |||
6328 | ||||
6329 | // We should have already dropped all cv-qualifiers by now. | |||
6330 | assert(!ParamType.hasQualifiers() &&((!ParamType.hasQualifiers() && "non-type template parameter type cannot be qualified" ) ? static_cast<void> (0) : __assert_fail ("!ParamType.hasQualifiers() && \"non-type template parameter type cannot be qualified\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6331, __PRETTY_FUNCTION__)) | |||
6331 | "non-type template parameter type cannot be qualified")((!ParamType.hasQualifiers() && "non-type template parameter type cannot be qualified" ) ? static_cast<void> (0) : __assert_fail ("!ParamType.hasQualifiers() && \"non-type template parameter type cannot be qualified\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6331, __PRETTY_FUNCTION__)); | |||
6332 | ||||
6333 | if (CTAK == CTAK_Deduced && | |||
6334 | !Context.hasSameType(ParamType.getNonLValueExprType(Context), | |||
6335 | Arg->getType())) { | |||
6336 | // FIXME: If either type is dependent, we skip the check. This isn't | |||
6337 | // correct, since during deduction we're supposed to have replaced each | |||
6338 | // template parameter with some unique (non-dependent) placeholder. | |||
6339 | // FIXME: If the argument type contains 'auto', we carry on and fail the | |||
6340 | // type check in order to force specific types to be more specialized than | |||
6341 | // 'auto'. It's not clear how partial ordering with 'auto' is supposed to | |||
6342 | // work. | |||
6343 | if ((ParamType->isDependentType() || Arg->isTypeDependent()) && | |||
6344 | !Arg->getType()->getContainedAutoType()) { | |||
6345 | Converted = TemplateArgument(Arg); | |||
6346 | return Arg; | |||
6347 | } | |||
6348 | // FIXME: This attempts to implement C++ [temp.deduct.type]p17. Per DR1770, | |||
6349 | // we should actually be checking the type of the template argument in P, | |||
6350 | // not the type of the template argument deduced from A, against the | |||
6351 | // template parameter type. | |||
6352 | Diag(StartLoc, diag::err_deduced_non_type_template_arg_type_mismatch) | |||
6353 | << Arg->getType() | |||
6354 | << ParamType.getUnqualifiedType(); | |||
6355 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6356 | return ExprError(); | |||
6357 | } | |||
6358 | ||||
6359 | // If either the parameter has a dependent type or the argument is | |||
6360 | // type-dependent, there's nothing we can check now. | |||
6361 | if (ParamType->isDependentType() || Arg->isTypeDependent()) { | |||
6362 | // FIXME: Produce a cloned, canonical expression? | |||
6363 | Converted = TemplateArgument(Arg); | |||
6364 | return Arg; | |||
6365 | } | |||
6366 | ||||
6367 | // The initialization of the parameter from the argument is | |||
6368 | // a constant-evaluated context. | |||
6369 | EnterExpressionEvaluationContext ConstantEvaluated( | |||
6370 | *this, Sema::ExpressionEvaluationContext::ConstantEvaluated); | |||
6371 | ||||
6372 | if (getLangOpts().CPlusPlus17) { | |||
6373 | // C++17 [temp.arg.nontype]p1: | |||
6374 | // A template-argument for a non-type template parameter shall be | |||
6375 | // a converted constant expression of the type of the template-parameter. | |||
6376 | APValue Value; | |||
6377 | ExprResult ArgResult = CheckConvertedConstantExpression( | |||
6378 | Arg, ParamType, Value, CCEK_TemplateArg); | |||
6379 | if (ArgResult.isInvalid()) | |||
6380 | return ExprError(); | |||
6381 | ||||
6382 | // For a value-dependent argument, CheckConvertedConstantExpression is | |||
6383 | // permitted (and expected) to be unable to determine a value. | |||
6384 | if (ArgResult.get()->isValueDependent()) { | |||
6385 | Converted = TemplateArgument(ArgResult.get()); | |||
6386 | return ArgResult; | |||
6387 | } | |||
6388 | ||||
6389 | QualType CanonParamType = Context.getCanonicalType(ParamType); | |||
6390 | ||||
6391 | // Convert the APValue to a TemplateArgument. | |||
6392 | switch (Value.getKind()) { | |||
6393 | case APValue::None: | |||
6394 | assert(ParamType->isNullPtrType())((ParamType->isNullPtrType()) ? static_cast<void> (0 ) : __assert_fail ("ParamType->isNullPtrType()", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6394, __PRETTY_FUNCTION__)); | |||
6395 | Converted = TemplateArgument(CanonParamType, /*isNullPtr*/true); | |||
6396 | break; | |||
6397 | case APValue::Indeterminate: | |||
6398 | llvm_unreachable("result of constant evaluation should be initialized")::llvm::llvm_unreachable_internal("result of constant evaluation should be initialized" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6398); | |||
6399 | break; | |||
6400 | case APValue::Int: | |||
6401 | assert(ParamType->isIntegralOrEnumerationType())((ParamType->isIntegralOrEnumerationType()) ? static_cast< void> (0) : __assert_fail ("ParamType->isIntegralOrEnumerationType()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6401, __PRETTY_FUNCTION__)); | |||
6402 | Converted = TemplateArgument(Context, Value.getInt(), CanonParamType); | |||
6403 | break; | |||
6404 | case APValue::MemberPointer: { | |||
6405 | assert(ParamType->isMemberPointerType())((ParamType->isMemberPointerType()) ? static_cast<void> (0) : __assert_fail ("ParamType->isMemberPointerType()", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6405, __PRETTY_FUNCTION__)); | |||
6406 | ||||
6407 | // FIXME: We need TemplateArgument representation and mangling for these. | |||
6408 | if (!Value.getMemberPointerPath().empty()) { | |||
6409 | Diag(Arg->getBeginLoc(), | |||
6410 | diag::err_template_arg_member_ptr_base_derived_not_supported) | |||
6411 | << Value.getMemberPointerDecl() << ParamType | |||
6412 | << Arg->getSourceRange(); | |||
6413 | return ExprError(); | |||
6414 | } | |||
6415 | ||||
6416 | auto *VD = const_cast<ValueDecl*>(Value.getMemberPointerDecl()); | |||
6417 | Converted = VD ? TemplateArgument(VD, CanonParamType) | |||
6418 | : TemplateArgument(CanonParamType, /*isNullPtr*/true); | |||
6419 | break; | |||
6420 | } | |||
6421 | case APValue::LValue: { | |||
6422 | // For a non-type template-parameter of pointer or reference type, | |||
6423 | // the value of the constant expression shall not refer to | |||
6424 | assert(ParamType->isPointerType() || ParamType->isReferenceType() ||((ParamType->isPointerType() || ParamType->isReferenceType () || ParamType->isNullPtrType()) ? static_cast<void> (0) : __assert_fail ("ParamType->isPointerType() || ParamType->isReferenceType() || ParamType->isNullPtrType()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6425, __PRETTY_FUNCTION__)) | |||
6425 | ParamType->isNullPtrType())((ParamType->isPointerType() || ParamType->isReferenceType () || ParamType->isNullPtrType()) ? static_cast<void> (0) : __assert_fail ("ParamType->isPointerType() || ParamType->isReferenceType() || ParamType->isNullPtrType()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6425, __PRETTY_FUNCTION__)); | |||
6426 | // -- a temporary object | |||
6427 | // -- a string literal | |||
6428 | // -- the result of a typeid expression, or | |||
6429 | // -- a predefined __func__ variable | |||
6430 | APValue::LValueBase Base = Value.getLValueBase(); | |||
6431 | auto *VD = const_cast<ValueDecl *>(Base.dyn_cast<const ValueDecl *>()); | |||
6432 | if (Base && !VD) { | |||
6433 | auto *E = Base.dyn_cast<const Expr *>(); | |||
6434 | if (E && isa<CXXUuidofExpr>(E)) { | |||
6435 | Converted = TemplateArgument(ArgResult.get()->IgnoreImpCasts()); | |||
6436 | break; | |||
6437 | } | |||
6438 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_decl_ref) | |||
6439 | << Arg->getSourceRange(); | |||
6440 | return ExprError(); | |||
6441 | } | |||
6442 | // -- a subobject | |||
6443 | if (Value.hasLValuePath() && Value.getLValuePath().size() == 1 && | |||
6444 | VD && VD->getType()->isArrayType() && | |||
6445 | Value.getLValuePath()[0].getAsArrayIndex() == 0 && | |||
6446 | !Value.isLValueOnePastTheEnd() && ParamType->isPointerType()) { | |||
6447 | // Per defect report (no number yet): | |||
6448 | // ... other than a pointer to the first element of a complete array | |||
6449 | // object. | |||
6450 | } else if (!Value.hasLValuePath() || Value.getLValuePath().size() || | |||
6451 | Value.isLValueOnePastTheEnd()) { | |||
6452 | Diag(StartLoc, diag::err_non_type_template_arg_subobject) | |||
6453 | << Value.getAsString(Context, ParamType); | |||
6454 | return ExprError(); | |||
6455 | } | |||
6456 | assert((VD || !ParamType->isReferenceType()) &&(((VD || !ParamType->isReferenceType()) && "null reference should not be a constant expression" ) ? static_cast<void> (0) : __assert_fail ("(VD || !ParamType->isReferenceType()) && \"null reference should not be a constant expression\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6457, __PRETTY_FUNCTION__)) | |||
6457 | "null reference should not be a constant expression")(((VD || !ParamType->isReferenceType()) && "null reference should not be a constant expression" ) ? static_cast<void> (0) : __assert_fail ("(VD || !ParamType->isReferenceType()) && \"null reference should not be a constant expression\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6457, __PRETTY_FUNCTION__)); | |||
6458 | assert((!VD || !ParamType->isNullPtrType()) &&(((!VD || !ParamType->isNullPtrType()) && "non-null value of type nullptr_t?" ) ? static_cast<void> (0) : __assert_fail ("(!VD || !ParamType->isNullPtrType()) && \"non-null value of type nullptr_t?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6459, __PRETTY_FUNCTION__)) | |||
6459 | "non-null value of type nullptr_t?")(((!VD || !ParamType->isNullPtrType()) && "non-null value of type nullptr_t?" ) ? static_cast<void> (0) : __assert_fail ("(!VD || !ParamType->isNullPtrType()) && \"non-null value of type nullptr_t?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6459, __PRETTY_FUNCTION__)); | |||
6460 | Converted = VD ? TemplateArgument(VD, CanonParamType) | |||
6461 | : TemplateArgument(CanonParamType, /*isNullPtr*/true); | |||
6462 | break; | |||
6463 | } | |||
6464 | case APValue::AddrLabelDiff: | |||
6465 | return Diag(StartLoc, diag::err_non_type_template_arg_addr_label_diff); | |||
6466 | case APValue::FixedPoint: | |||
6467 | case APValue::Float: | |||
6468 | case APValue::ComplexInt: | |||
6469 | case APValue::ComplexFloat: | |||
6470 | case APValue::Vector: | |||
6471 | case APValue::Array: | |||
6472 | case APValue::Struct: | |||
6473 | case APValue::Union: | |||
6474 | llvm_unreachable("invalid kind for template argument")::llvm::llvm_unreachable_internal("invalid kind for template argument" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6474); | |||
6475 | } | |||
6476 | ||||
6477 | return ArgResult.get(); | |||
6478 | } | |||
6479 | ||||
6480 | // C++ [temp.arg.nontype]p5: | |||
6481 | // The following conversions are performed on each expression used | |||
6482 | // as a non-type template-argument. If a non-type | |||
6483 | // template-argument cannot be converted to the type of the | |||
6484 | // corresponding template-parameter then the program is | |||
6485 | // ill-formed. | |||
6486 | if (ParamType->isIntegralOrEnumerationType()) { | |||
6487 | // C++11: | |||
6488 | // -- for a non-type template-parameter of integral or | |||
6489 | // enumeration type, conversions permitted in a converted | |||
6490 | // constant expression are applied. | |||
6491 | // | |||
6492 | // C++98: | |||
6493 | // -- for a non-type template-parameter of integral or | |||
6494 | // enumeration type, integral promotions (4.5) and integral | |||
6495 | // conversions (4.7) are applied. | |||
6496 | ||||
6497 | if (getLangOpts().CPlusPlus11) { | |||
6498 | // C++ [temp.arg.nontype]p1: | |||
6499 | // A template-argument for a non-type, non-template template-parameter | |||
6500 | // shall be one of: | |||
6501 | // | |||
6502 | // -- for a non-type template-parameter of integral or enumeration | |||
6503 | // type, a converted constant expression of the type of the | |||
6504 | // template-parameter; or | |||
6505 | llvm::APSInt Value; | |||
6506 | ExprResult ArgResult = | |||
6507 | CheckConvertedConstantExpression(Arg, ParamType, Value, | |||
6508 | CCEK_TemplateArg); | |||
6509 | if (ArgResult.isInvalid()) | |||
6510 | return ExprError(); | |||
6511 | ||||
6512 | // We can't check arbitrary value-dependent arguments. | |||
6513 | if (ArgResult.get()->isValueDependent()) { | |||
6514 | Converted = TemplateArgument(ArgResult.get()); | |||
6515 | return ArgResult; | |||
6516 | } | |||
6517 | ||||
6518 | // Widen the argument value to sizeof(parameter type). This is almost | |||
6519 | // always a no-op, except when the parameter type is bool. In | |||
6520 | // that case, this may extend the argument from 1 bit to 8 bits. | |||
6521 | QualType IntegerType = ParamType; | |||
6522 | if (const EnumType *Enum = IntegerType->getAs<EnumType>()) | |||
6523 | IntegerType = Enum->getDecl()->getIntegerType(); | |||
6524 | Value = Value.extOrTrunc(Context.getTypeSize(IntegerType)); | |||
6525 | ||||
6526 | Converted = TemplateArgument(Context, Value, | |||
6527 | Context.getCanonicalType(ParamType)); | |||
6528 | return ArgResult; | |||
6529 | } | |||
6530 | ||||
6531 | ExprResult ArgResult = DefaultLvalueConversion(Arg); | |||
6532 | if (ArgResult.isInvalid()) | |||
6533 | return ExprError(); | |||
6534 | Arg = ArgResult.get(); | |||
6535 | ||||
6536 | QualType ArgType = Arg->getType(); | |||
6537 | ||||
6538 | // C++ [temp.arg.nontype]p1: | |||
6539 | // A template-argument for a non-type, non-template | |||
6540 | // template-parameter shall be one of: | |||
6541 | // | |||
6542 | // -- an integral constant-expression of integral or enumeration | |||
6543 | // type; or | |||
6544 | // -- the name of a non-type template-parameter; or | |||
6545 | llvm::APSInt Value; | |||
6546 | if (!ArgType->isIntegralOrEnumerationType()) { | |||
6547 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_integral_or_enumeral) | |||
6548 | << ArgType << Arg->getSourceRange(); | |||
6549 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6550 | return ExprError(); | |||
6551 | } else if (!Arg->isValueDependent()) { | |||
6552 | class TmplArgICEDiagnoser : public VerifyICEDiagnoser { | |||
6553 | QualType T; | |||
6554 | ||||
6555 | public: | |||
6556 | TmplArgICEDiagnoser(QualType T) : T(T) { } | |||
6557 | ||||
6558 | void diagnoseNotICE(Sema &S, SourceLocation Loc, | |||
6559 | SourceRange SR) override { | |||
6560 | S.Diag(Loc, diag::err_template_arg_not_ice) << T << SR; | |||
6561 | } | |||
6562 | } Diagnoser(ArgType); | |||
6563 | ||||
6564 | Arg = VerifyIntegerConstantExpression(Arg, &Value, Diagnoser, | |||
6565 | false).get(); | |||
6566 | if (!Arg) | |||
6567 | return ExprError(); | |||
6568 | } | |||
6569 | ||||
6570 | // From here on out, all we care about is the unqualified form | |||
6571 | // of the argument type. | |||
6572 | ArgType = ArgType.getUnqualifiedType(); | |||
6573 | ||||
6574 | // Try to convert the argument to the parameter's type. | |||
6575 | if (Context.hasSameType(ParamType, ArgType)) { | |||
6576 | // Okay: no conversion necessary | |||
6577 | } else if (ParamType->isBooleanType()) { | |||
6578 | // This is an integral-to-boolean conversion. | |||
6579 | Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralToBoolean).get(); | |||
6580 | } else if (IsIntegralPromotion(Arg, ArgType, ParamType) || | |||
6581 | !ParamType->isEnumeralType()) { | |||
6582 | // This is an integral promotion or conversion. | |||
6583 | Arg = ImpCastExprToType(Arg, ParamType, CK_IntegralCast).get(); | |||
6584 | } else { | |||
6585 | // We can't perform this conversion. | |||
6586 | Diag(Arg->getBeginLoc(), diag::err_template_arg_not_convertible) | |||
6587 | << Arg->getType() << ParamType << Arg->getSourceRange(); | |||
6588 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6589 | return ExprError(); | |||
6590 | } | |||
6591 | ||||
6592 | // Add the value of this argument to the list of converted | |||
6593 | // arguments. We use the bitwidth and signedness of the template | |||
6594 | // parameter. | |||
6595 | if (Arg->isValueDependent()) { | |||
6596 | // The argument is value-dependent. Create a new | |||
6597 | // TemplateArgument with the converted expression. | |||
6598 | Converted = TemplateArgument(Arg); | |||
6599 | return Arg; | |||
6600 | } | |||
6601 | ||||
6602 | QualType IntegerType = Context.getCanonicalType(ParamType); | |||
6603 | if (const EnumType *Enum = IntegerType->getAs<EnumType>()) | |||
6604 | IntegerType = Context.getCanonicalType(Enum->getDecl()->getIntegerType()); | |||
6605 | ||||
6606 | if (ParamType->isBooleanType()) { | |||
6607 | // Value must be zero or one. | |||
6608 | Value = Value != 0; | |||
6609 | unsigned AllowedBits = Context.getTypeSize(IntegerType); | |||
6610 | if (Value.getBitWidth() != AllowedBits) | |||
6611 | Value = Value.extOrTrunc(AllowedBits); | |||
6612 | Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); | |||
6613 | } else { | |||
6614 | llvm::APSInt OldValue = Value; | |||
6615 | ||||
6616 | // Coerce the template argument's value to the value it will have | |||
6617 | // based on the template parameter's type. | |||
6618 | unsigned AllowedBits = Context.getTypeSize(IntegerType); | |||
6619 | if (Value.getBitWidth() != AllowedBits) | |||
6620 | Value = Value.extOrTrunc(AllowedBits); | |||
6621 | Value.setIsSigned(IntegerType->isSignedIntegerOrEnumerationType()); | |||
6622 | ||||
6623 | // Complain if an unsigned parameter received a negative value. | |||
6624 | if (IntegerType->isUnsignedIntegerOrEnumerationType() | |||
6625 | && (OldValue.isSigned() && OldValue.isNegative())) { | |||
6626 | Diag(Arg->getBeginLoc(), diag::warn_template_arg_negative) | |||
6627 | << OldValue.toString(10) << Value.toString(10) << Param->getType() | |||
6628 | << Arg->getSourceRange(); | |||
6629 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6630 | } | |||
6631 | ||||
6632 | // Complain if we overflowed the template parameter's type. | |||
6633 | unsigned RequiredBits; | |||
6634 | if (IntegerType->isUnsignedIntegerOrEnumerationType()) | |||
6635 | RequiredBits = OldValue.getActiveBits(); | |||
6636 | else if (OldValue.isUnsigned()) | |||
6637 | RequiredBits = OldValue.getActiveBits() + 1; | |||
6638 | else | |||
6639 | RequiredBits = OldValue.getMinSignedBits(); | |||
6640 | if (RequiredBits > AllowedBits) { | |||
6641 | Diag(Arg->getBeginLoc(), diag::warn_template_arg_too_large) | |||
6642 | << OldValue.toString(10) << Value.toString(10) << Param->getType() | |||
6643 | << Arg->getSourceRange(); | |||
6644 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6645 | } | |||
6646 | } | |||
6647 | ||||
6648 | Converted = TemplateArgument(Context, Value, | |||
6649 | ParamType->isEnumeralType() | |||
6650 | ? Context.getCanonicalType(ParamType) | |||
6651 | : IntegerType); | |||
6652 | return Arg; | |||
6653 | } | |||
6654 | ||||
6655 | QualType ArgType = Arg->getType(); | |||
6656 | DeclAccessPair FoundResult; // temporary for ResolveOverloadedFunction | |||
6657 | ||||
6658 | // Handle pointer-to-function, reference-to-function, and | |||
6659 | // pointer-to-member-function all in (roughly) the same way. | |||
6660 | if (// -- For a non-type template-parameter of type pointer to | |||
6661 | // function, only the function-to-pointer conversion (4.3) is | |||
6662 | // applied. If the template-argument represents a set of | |||
6663 | // overloaded functions (or a pointer to such), the matching | |||
6664 | // function is selected from the set (13.4). | |||
6665 | (ParamType->isPointerType() && | |||
6666 | ParamType->getAs<PointerType>()->getPointeeType()->isFunctionType()) || | |||
6667 | // -- For a non-type template-parameter of type reference to | |||
6668 | // function, no conversions apply. If the template-argument | |||
6669 | // represents a set of overloaded functions, the matching | |||
6670 | // function is selected from the set (13.4). | |||
6671 | (ParamType->isReferenceType() && | |||
6672 | ParamType->getAs<ReferenceType>()->getPointeeType()->isFunctionType()) || | |||
6673 | // -- For a non-type template-parameter of type pointer to | |||
6674 | // member function, no conversions apply. If the | |||
6675 | // template-argument represents a set of overloaded member | |||
6676 | // functions, the matching member function is selected from | |||
6677 | // the set (13.4). | |||
6678 | (ParamType->isMemberPointerType() && | |||
6679 | ParamType->getAs<MemberPointerType>()->getPointeeType() | |||
6680 | ->isFunctionType())) { | |||
6681 | ||||
6682 | if (Arg->getType() == Context.OverloadTy) { | |||
6683 | if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, ParamType, | |||
6684 | true, | |||
6685 | FoundResult)) { | |||
6686 | if (DiagnoseUseOfDecl(Fn, Arg->getBeginLoc())) | |||
6687 | return ExprError(); | |||
6688 | ||||
6689 | Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); | |||
6690 | ArgType = Arg->getType(); | |||
6691 | } else | |||
6692 | return ExprError(); | |||
6693 | } | |||
6694 | ||||
6695 | if (!ParamType->isMemberPointerType()) { | |||
6696 | if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, | |||
6697 | ParamType, | |||
6698 | Arg, Converted)) | |||
6699 | return ExprError(); | |||
6700 | return Arg; | |||
6701 | } | |||
6702 | ||||
6703 | if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg, | |||
6704 | Converted)) | |||
6705 | return ExprError(); | |||
6706 | return Arg; | |||
6707 | } | |||
6708 | ||||
6709 | if (ParamType->isPointerType()) { | |||
6710 | // -- for a non-type template-parameter of type pointer to | |||
6711 | // object, qualification conversions (4.4) and the | |||
6712 | // array-to-pointer conversion (4.2) are applied. | |||
6713 | // C++0x also allows a value of std::nullptr_t. | |||
6714 | assert(ParamType->getPointeeType()->isIncompleteOrObjectType() &&((ParamType->getPointeeType()->isIncompleteOrObjectType () && "Only object pointers allowed here") ? static_cast <void> (0) : __assert_fail ("ParamType->getPointeeType()->isIncompleteOrObjectType() && \"Only object pointers allowed here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6715, __PRETTY_FUNCTION__)) | |||
6715 | "Only object pointers allowed here")((ParamType->getPointeeType()->isIncompleteOrObjectType () && "Only object pointers allowed here") ? static_cast <void> (0) : __assert_fail ("ParamType->getPointeeType()->isIncompleteOrObjectType() && \"Only object pointers allowed here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6715, __PRETTY_FUNCTION__)); | |||
6716 | ||||
6717 | if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, | |||
6718 | ParamType, | |||
6719 | Arg, Converted)) | |||
6720 | return ExprError(); | |||
6721 | return Arg; | |||
6722 | } | |||
6723 | ||||
6724 | if (const ReferenceType *ParamRefType = ParamType->getAs<ReferenceType>()) { | |||
6725 | // -- For a non-type template-parameter of type reference to | |||
6726 | // object, no conversions apply. The type referred to by the | |||
6727 | // reference may be more cv-qualified than the (otherwise | |||
6728 | // identical) type of the template-argument. The | |||
6729 | // template-parameter is bound directly to the | |||
6730 | // template-argument, which must be an lvalue. | |||
6731 | assert(ParamRefType->getPointeeType()->isIncompleteOrObjectType() &&((ParamRefType->getPointeeType()->isIncompleteOrObjectType () && "Only object references allowed here") ? static_cast <void> (0) : __assert_fail ("ParamRefType->getPointeeType()->isIncompleteOrObjectType() && \"Only object references allowed here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6732, __PRETTY_FUNCTION__)) | |||
6732 | "Only object references allowed here")((ParamRefType->getPointeeType()->isIncompleteOrObjectType () && "Only object references allowed here") ? static_cast <void> (0) : __assert_fail ("ParamRefType->getPointeeType()->isIncompleteOrObjectType() && \"Only object references allowed here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6732, __PRETTY_FUNCTION__)); | |||
6733 | ||||
6734 | if (Arg->getType() == Context.OverloadTy) { | |||
6735 | if (FunctionDecl *Fn = ResolveAddressOfOverloadedFunction(Arg, | |||
6736 | ParamRefType->getPointeeType(), | |||
6737 | true, | |||
6738 | FoundResult)) { | |||
6739 | if (DiagnoseUseOfDecl(Fn, Arg->getBeginLoc())) | |||
6740 | return ExprError(); | |||
6741 | ||||
6742 | Arg = FixOverloadedFunctionReference(Arg, FoundResult, Fn); | |||
6743 | ArgType = Arg->getType(); | |||
6744 | } else | |||
6745 | return ExprError(); | |||
6746 | } | |||
6747 | ||||
6748 | if (CheckTemplateArgumentAddressOfObjectOrFunction(*this, Param, | |||
6749 | ParamType, | |||
6750 | Arg, Converted)) | |||
6751 | return ExprError(); | |||
6752 | return Arg; | |||
6753 | } | |||
6754 | ||||
6755 | // Deal with parameters of type std::nullptr_t. | |||
6756 | if (ParamType->isNullPtrType()) { | |||
6757 | if (Arg->isTypeDependent() || Arg->isValueDependent()) { | |||
6758 | Converted = TemplateArgument(Arg); | |||
6759 | return Arg; | |||
6760 | } | |||
6761 | ||||
6762 | switch (isNullPointerValueTemplateArgument(*this, Param, ParamType, Arg)) { | |||
6763 | case NPV_NotNullPointer: | |||
6764 | Diag(Arg->getExprLoc(), diag::err_template_arg_not_convertible) | |||
6765 | << Arg->getType() << ParamType; | |||
6766 | Diag(Param->getLocation(), diag::note_template_param_here); | |||
6767 | return ExprError(); | |||
6768 | ||||
6769 | case NPV_Error: | |||
6770 | return ExprError(); | |||
6771 | ||||
6772 | case NPV_NullPointer: | |||
6773 | Diag(Arg->getExprLoc(), diag::warn_cxx98_compat_template_arg_null); | |||
6774 | Converted = TemplateArgument(Context.getCanonicalType(ParamType), | |||
6775 | /*isNullPtr*/true); | |||
6776 | return Arg; | |||
6777 | } | |||
6778 | } | |||
6779 | ||||
6780 | // -- For a non-type template-parameter of type pointer to data | |||
6781 | // member, qualification conversions (4.4) are applied. | |||
6782 | assert(ParamType->isMemberPointerType() && "Only pointers to members remain")((ParamType->isMemberPointerType() && "Only pointers to members remain" ) ? static_cast<void> (0) : __assert_fail ("ParamType->isMemberPointerType() && \"Only pointers to members remain\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6782, __PRETTY_FUNCTION__)); | |||
6783 | ||||
6784 | if (CheckTemplateArgumentPointerToMember(*this, Param, ParamType, Arg, | |||
6785 | Converted)) | |||
6786 | return ExprError(); | |||
6787 | return Arg; | |||
6788 | } | |||
6789 | ||||
6790 | static void DiagnoseTemplateParameterListArityMismatch( | |||
6791 | Sema &S, TemplateParameterList *New, TemplateParameterList *Old, | |||
6792 | Sema::TemplateParameterListEqualKind Kind, SourceLocation TemplateArgLoc); | |||
6793 | ||||
6794 | /// Check a template argument against its corresponding | |||
6795 | /// template template parameter. | |||
6796 | /// | |||
6797 | /// This routine implements the semantics of C++ [temp.arg.template]. | |||
6798 | /// It returns true if an error occurred, and false otherwise. | |||
6799 | bool Sema::CheckTemplateTemplateArgument(TemplateParameterList *Params, | |||
6800 | TemplateArgumentLoc &Arg) { | |||
6801 | TemplateName Name = Arg.getArgument().getAsTemplateOrTemplatePattern(); | |||
6802 | TemplateDecl *Template = Name.getAsTemplateDecl(); | |||
6803 | if (!Template) { | |||
6804 | // Any dependent template name is fine. | |||
6805 | assert(Name.isDependent() && "Non-dependent template isn't a declaration?")((Name.isDependent() && "Non-dependent template isn't a declaration?" ) ? static_cast<void> (0) : __assert_fail ("Name.isDependent() && \"Non-dependent template isn't a declaration?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6805, __PRETTY_FUNCTION__)); | |||
6806 | return false; | |||
6807 | } | |||
6808 | ||||
6809 | if (Template->isInvalidDecl()) | |||
6810 | return true; | |||
6811 | ||||
6812 | // C++0x [temp.arg.template]p1: | |||
6813 | // A template-argument for a template template-parameter shall be | |||
6814 | // the name of a class template or an alias template, expressed as an | |||
6815 | // id-expression. When the template-argument names a class template, only | |||
6816 | // primary class templates are considered when matching the | |||
6817 | // template template argument with the corresponding parameter; | |||
6818 | // partial specializations are not considered even if their | |||
6819 | // parameter lists match that of the template template parameter. | |||
6820 | // | |||
6821 | // Note that we also allow template template parameters here, which | |||
6822 | // will happen when we are dealing with, e.g., class template | |||
6823 | // partial specializations. | |||
6824 | if (!isa<ClassTemplateDecl>(Template) && | |||
6825 | !isa<TemplateTemplateParmDecl>(Template) && | |||
6826 | !isa<TypeAliasTemplateDecl>(Template) && | |||
6827 | !isa<BuiltinTemplateDecl>(Template)) { | |||
6828 | assert(isa<FunctionTemplateDecl>(Template) &&((isa<FunctionTemplateDecl>(Template) && "Only function templates are possible here" ) ? static_cast<void> (0) : __assert_fail ("isa<FunctionTemplateDecl>(Template) && \"Only function templates are possible here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6829, __PRETTY_FUNCTION__)) | |||
6829 | "Only function templates are possible here")((isa<FunctionTemplateDecl>(Template) && "Only function templates are possible here" ) ? static_cast<void> (0) : __assert_fail ("isa<FunctionTemplateDecl>(Template) && \"Only function templates are possible here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6829, __PRETTY_FUNCTION__)); | |||
6830 | Diag(Arg.getLocation(), diag::err_template_arg_not_valid_template); | |||
6831 | Diag(Template->getLocation(), diag::note_template_arg_refers_here_func) | |||
6832 | << Template; | |||
6833 | } | |||
6834 | ||||
6835 | // C++1z [temp.arg.template]p3: (DR 150) | |||
6836 | // A template-argument matches a template template-parameter P when P | |||
6837 | // is at least as specialized as the template-argument A. | |||
6838 | if (getLangOpts().RelaxedTemplateTemplateArgs) { | |||
6839 | // Quick check for the common case: | |||
6840 | // If P contains a parameter pack, then A [...] matches P if each of A's | |||
6841 | // template parameters matches the corresponding template parameter in | |||
6842 | // the template-parameter-list of P. | |||
6843 | if (TemplateParameterListsAreEqual( | |||
6844 | Template->getTemplateParameters(), Params, false, | |||
6845 | TPL_TemplateTemplateArgumentMatch, Arg.getLocation())) | |||
6846 | return false; | |||
6847 | ||||
6848 | if (isTemplateTemplateParameterAtLeastAsSpecializedAs(Params, Template, | |||
6849 | Arg.getLocation())) | |||
6850 | return false; | |||
6851 | // FIXME: Produce better diagnostics for deduction failures. | |||
6852 | } | |||
6853 | ||||
6854 | return !TemplateParameterListsAreEqual(Template->getTemplateParameters(), | |||
6855 | Params, | |||
6856 | true, | |||
6857 | TPL_TemplateTemplateArgumentMatch, | |||
6858 | Arg.getLocation()); | |||
6859 | } | |||
6860 | ||||
6861 | /// Given a non-type template argument that refers to a | |||
6862 | /// declaration and the type of its corresponding non-type template | |||
6863 | /// parameter, produce an expression that properly refers to that | |||
6864 | /// declaration. | |||
6865 | ExprResult | |||
6866 | Sema::BuildExpressionFromDeclTemplateArgument(const TemplateArgument &Arg, | |||
6867 | QualType ParamType, | |||
6868 | SourceLocation Loc) { | |||
6869 | // C++ [temp.param]p8: | |||
6870 | // | |||
6871 | // A non-type template-parameter of type "array of T" or | |||
6872 | // "function returning T" is adjusted to be of type "pointer to | |||
6873 | // T" or "pointer to function returning T", respectively. | |||
6874 | if (ParamType->isArrayType()) | |||
6875 | ParamType = Context.getArrayDecayedType(ParamType); | |||
6876 | else if (ParamType->isFunctionType()) | |||
6877 | ParamType = Context.getPointerType(ParamType); | |||
6878 | ||||
6879 | // For a NULL non-type template argument, return nullptr casted to the | |||
6880 | // parameter's type. | |||
6881 | if (Arg.getKind() == TemplateArgument::NullPtr) { | |||
6882 | return ImpCastExprToType( | |||
6883 | new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc), | |||
6884 | ParamType, | |||
6885 | ParamType->getAs<MemberPointerType>() | |||
6886 | ? CK_NullToMemberPointer | |||
6887 | : CK_NullToPointer); | |||
6888 | } | |||
6889 | assert(Arg.getKind() == TemplateArgument::Declaration &&((Arg.getKind() == TemplateArgument::Declaration && "Only declaration template arguments permitted here" ) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Declaration && \"Only declaration template arguments permitted here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6890, __PRETTY_FUNCTION__)) | |||
6890 | "Only declaration template arguments permitted here")((Arg.getKind() == TemplateArgument::Declaration && "Only declaration template arguments permitted here" ) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Declaration && \"Only declaration template arguments permitted here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6890, __PRETTY_FUNCTION__)); | |||
6891 | ||||
6892 | ValueDecl *VD = Arg.getAsDecl(); | |||
6893 | ||||
6894 | if (VD->getDeclContext()->isRecord() && | |||
6895 | (isa<CXXMethodDecl>(VD) || isa<FieldDecl>(VD) || | |||
6896 | isa<IndirectFieldDecl>(VD))) { | |||
6897 | // If the value is a class member, we might have a pointer-to-member. | |||
6898 | // Determine whether the non-type template template parameter is of | |||
6899 | // pointer-to-member type. If so, we need to build an appropriate | |||
6900 | // expression for a pointer-to-member, since a "normal" DeclRefExpr | |||
6901 | // would refer to the member itself. | |||
6902 | if (ParamType->isMemberPointerType()) { | |||
6903 | QualType ClassType | |||
6904 | = Context.getTypeDeclType(cast<RecordDecl>(VD->getDeclContext())); | |||
6905 | NestedNameSpecifier *Qualifier | |||
6906 | = NestedNameSpecifier::Create(Context, nullptr, false, | |||
6907 | ClassType.getTypePtr()); | |||
6908 | CXXScopeSpec SS; | |||
6909 | SS.MakeTrivial(Context, Qualifier, Loc); | |||
6910 | ||||
6911 | // The actual value-ness of this is unimportant, but for | |||
6912 | // internal consistency's sake, references to instance methods | |||
6913 | // are r-values. | |||
6914 | ExprValueKind VK = VK_LValue; | |||
6915 | if (isa<CXXMethodDecl>(VD) && cast<CXXMethodDecl>(VD)->isInstance()) | |||
6916 | VK = VK_RValue; | |||
6917 | ||||
6918 | ExprResult RefExpr = BuildDeclRefExpr(VD, | |||
6919 | VD->getType().getNonReferenceType(), | |||
6920 | VK, | |||
6921 | Loc, | |||
6922 | &SS); | |||
6923 | if (RefExpr.isInvalid()) | |||
6924 | return ExprError(); | |||
6925 | ||||
6926 | RefExpr = CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get()); | |||
6927 | ||||
6928 | // We might need to perform a trailing qualification conversion, since | |||
6929 | // the element type on the parameter could be more qualified than the | |||
6930 | // element type in the expression we constructed. | |||
6931 | bool ObjCLifetimeConversion; | |||
6932 | if (IsQualificationConversion(((Expr*) RefExpr.get())->getType(), | |||
6933 | ParamType.getUnqualifiedType(), false, | |||
6934 | ObjCLifetimeConversion)) | |||
6935 | RefExpr = ImpCastExprToType(RefExpr.get(), ParamType.getUnqualifiedType(), CK_NoOp); | |||
6936 | ||||
6937 | assert(!RefExpr.isInvalid() &&((!RefExpr.isInvalid() && Context.hasSameType(((Expr* ) RefExpr.get())->getType(), ParamType.getUnqualifiedType( ))) ? static_cast<void> (0) : __assert_fail ("!RefExpr.isInvalid() && Context.hasSameType(((Expr*) RefExpr.get())->getType(), ParamType.getUnqualifiedType())" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6939, __PRETTY_FUNCTION__)) | |||
6938 | Context.hasSameType(((Expr*) RefExpr.get())->getType(),((!RefExpr.isInvalid() && Context.hasSameType(((Expr* ) RefExpr.get())->getType(), ParamType.getUnqualifiedType( ))) ? static_cast<void> (0) : __assert_fail ("!RefExpr.isInvalid() && Context.hasSameType(((Expr*) RefExpr.get())->getType(), ParamType.getUnqualifiedType())" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6939, __PRETTY_FUNCTION__)) | |||
6939 | ParamType.getUnqualifiedType()))((!RefExpr.isInvalid() && Context.hasSameType(((Expr* ) RefExpr.get())->getType(), ParamType.getUnqualifiedType( ))) ? static_cast<void> (0) : __assert_fail ("!RefExpr.isInvalid() && Context.hasSameType(((Expr*) RefExpr.get())->getType(), ParamType.getUnqualifiedType())" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6939, __PRETTY_FUNCTION__)); | |||
6940 | return RefExpr; | |||
6941 | } | |||
6942 | } | |||
6943 | ||||
6944 | QualType T = VD->getType().getNonReferenceType(); | |||
6945 | ||||
6946 | if (ParamType->isPointerType()) { | |||
6947 | // When the non-type template parameter is a pointer, take the | |||
6948 | // address of the declaration. | |||
6949 | ExprResult RefExpr = BuildDeclRefExpr(VD, T, VK_LValue, Loc); | |||
6950 | if (RefExpr.isInvalid()) | |||
6951 | return ExprError(); | |||
6952 | ||||
6953 | if (!Context.hasSameUnqualifiedType(ParamType->getPointeeType(), T) && | |||
6954 | (T->isFunctionType() || T->isArrayType())) { | |||
6955 | // Decay functions and arrays unless we're forming a pointer to array. | |||
6956 | RefExpr = DefaultFunctionArrayConversion(RefExpr.get()); | |||
6957 | if (RefExpr.isInvalid()) | |||
6958 | return ExprError(); | |||
6959 | ||||
6960 | return RefExpr; | |||
6961 | } | |||
6962 | ||||
6963 | // Take the address of everything else | |||
6964 | return CreateBuiltinUnaryOp(Loc, UO_AddrOf, RefExpr.get()); | |||
6965 | } | |||
6966 | ||||
6967 | ExprValueKind VK = VK_RValue; | |||
6968 | ||||
6969 | // If the non-type template parameter has reference type, qualify the | |||
6970 | // resulting declaration reference with the extra qualifiers on the | |||
6971 | // type that the reference refers to. | |||
6972 | if (const ReferenceType *TargetRef = ParamType->getAs<ReferenceType>()) { | |||
6973 | VK = VK_LValue; | |||
6974 | T = Context.getQualifiedType(T, | |||
6975 | TargetRef->getPointeeType().getQualifiers()); | |||
6976 | } else if (isa<FunctionDecl>(VD)) { | |||
6977 | // References to functions are always lvalues. | |||
6978 | VK = VK_LValue; | |||
6979 | } | |||
6980 | ||||
6981 | return BuildDeclRefExpr(VD, T, VK, Loc); | |||
6982 | } | |||
6983 | ||||
6984 | /// Construct a new expression that refers to the given | |||
6985 | /// integral template argument with the given source-location | |||
6986 | /// information. | |||
6987 | /// | |||
6988 | /// This routine takes care of the mapping from an integral template | |||
6989 | /// argument (which may have any integral type) to the appropriate | |||
6990 | /// literal value. | |||
6991 | ExprResult | |||
6992 | Sema::BuildExpressionFromIntegralTemplateArgument(const TemplateArgument &Arg, | |||
6993 | SourceLocation Loc) { | |||
6994 | assert(Arg.getKind() == TemplateArgument::Integral &&((Arg.getKind() == TemplateArgument::Integral && "Operation is only valid for integral template arguments" ) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Integral && \"Operation is only valid for integral template arguments\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6995, __PRETTY_FUNCTION__)) | |||
6995 | "Operation is only valid for integral template arguments")((Arg.getKind() == TemplateArgument::Integral && "Operation is only valid for integral template arguments" ) ? static_cast<void> (0) : __assert_fail ("Arg.getKind() == TemplateArgument::Integral && \"Operation is only valid for integral template arguments\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 6995, __PRETTY_FUNCTION__)); | |||
6996 | QualType OrigT = Arg.getIntegralType(); | |||
6997 | ||||
6998 | // If this is an enum type that we're instantiating, we need to use an integer | |||
6999 | // type the same size as the enumerator. We don't want to build an | |||
7000 | // IntegerLiteral with enum type. The integer type of an enum type can be of | |||
7001 | // any integral type with C++11 enum classes, make sure we create the right | |||
7002 | // type of literal for it. | |||
7003 | QualType T = OrigT; | |||
7004 | if (const EnumType *ET = OrigT->getAs<EnumType>()) | |||
7005 | T = ET->getDecl()->getIntegerType(); | |||
7006 | ||||
7007 | Expr *E; | |||
7008 | if (T->isAnyCharacterType()) { | |||
7009 | CharacterLiteral::CharacterKind Kind; | |||
7010 | if (T->isWideCharType()) | |||
7011 | Kind = CharacterLiteral::Wide; | |||
7012 | else if (T->isChar8Type() && getLangOpts().Char8) | |||
7013 | Kind = CharacterLiteral::UTF8; | |||
7014 | else if (T->isChar16Type()) | |||
7015 | Kind = CharacterLiteral::UTF16; | |||
7016 | else if (T->isChar32Type()) | |||
7017 | Kind = CharacterLiteral::UTF32; | |||
7018 | else | |||
7019 | Kind = CharacterLiteral::Ascii; | |||
7020 | ||||
7021 | E = new (Context) CharacterLiteral(Arg.getAsIntegral().getZExtValue(), | |||
7022 | Kind, T, Loc); | |||
7023 | } else if (T->isBooleanType()) { | |||
7024 | E = new (Context) CXXBoolLiteralExpr(Arg.getAsIntegral().getBoolValue(), | |||
7025 | T, Loc); | |||
7026 | } else if (T->isNullPtrType()) { | |||
7027 | E = new (Context) CXXNullPtrLiteralExpr(Context.NullPtrTy, Loc); | |||
7028 | } else { | |||
7029 | E = IntegerLiteral::Create(Context, Arg.getAsIntegral(), T, Loc); | |||
7030 | } | |||
7031 | ||||
7032 | if (OrigT->isEnumeralType()) { | |||
7033 | // FIXME: This is a hack. We need a better way to handle substituted | |||
7034 | // non-type template parameters. | |||
7035 | E = CStyleCastExpr::Create(Context, OrigT, VK_RValue, CK_IntegralCast, E, | |||
7036 | nullptr, | |||
7037 | Context.getTrivialTypeSourceInfo(OrigT, Loc), | |||
7038 | Loc, Loc); | |||
7039 | } | |||
7040 | ||||
7041 | return E; | |||
7042 | } | |||
7043 | ||||
7044 | /// Match two template parameters within template parameter lists. | |||
7045 | static bool MatchTemplateParameterKind(Sema &S, NamedDecl *New, NamedDecl *Old, | |||
7046 | bool Complain, | |||
7047 | Sema::TemplateParameterListEqualKind Kind, | |||
7048 | SourceLocation TemplateArgLoc) { | |||
7049 | // Check the actual kind (type, non-type, template). | |||
7050 | if (Old->getKind() != New->getKind()) { | |||
7051 | if (Complain) { | |||
7052 | unsigned NextDiag = diag::err_template_param_different_kind; | |||
7053 | if (TemplateArgLoc.isValid()) { | |||
7054 | S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); | |||
7055 | NextDiag = diag::note_template_param_different_kind; | |||
7056 | } | |||
7057 | S.Diag(New->getLocation(), NextDiag) | |||
7058 | << (Kind != Sema::TPL_TemplateMatch); | |||
7059 | S.Diag(Old->getLocation(), diag::note_template_prev_declaration) | |||
7060 | << (Kind != Sema::TPL_TemplateMatch); | |||
7061 | } | |||
7062 | ||||
7063 | return false; | |||
7064 | } | |||
7065 | ||||
7066 | // Check that both are parameter packs or neither are parameter packs. | |||
7067 | // However, if we are matching a template template argument to a | |||
7068 | // template template parameter, the template template parameter can have | |||
7069 | // a parameter pack where the template template argument does not. | |||
7070 | if (Old->isTemplateParameterPack() != New->isTemplateParameterPack() && | |||
7071 | !(Kind == Sema::TPL_TemplateTemplateArgumentMatch && | |||
7072 | Old->isTemplateParameterPack())) { | |||
7073 | if (Complain) { | |||
7074 | unsigned NextDiag = diag::err_template_parameter_pack_non_pack; | |||
7075 | if (TemplateArgLoc.isValid()) { | |||
7076 | S.Diag(TemplateArgLoc, | |||
7077 | diag::err_template_arg_template_params_mismatch); | |||
7078 | NextDiag = diag::note_template_parameter_pack_non_pack; | |||
7079 | } | |||
7080 | ||||
7081 | unsigned ParamKind = isa<TemplateTypeParmDecl>(New)? 0 | |||
7082 | : isa<NonTypeTemplateParmDecl>(New)? 1 | |||
7083 | : 2; | |||
7084 | S.Diag(New->getLocation(), NextDiag) | |||
7085 | << ParamKind << New->isParameterPack(); | |||
7086 | S.Diag(Old->getLocation(), diag::note_template_parameter_pack_here) | |||
7087 | << ParamKind << Old->isParameterPack(); | |||
7088 | } | |||
7089 | ||||
7090 | return false; | |||
7091 | } | |||
7092 | ||||
7093 | // For non-type template parameters, check the type of the parameter. | |||
7094 | if (NonTypeTemplateParmDecl *OldNTTP | |||
7095 | = dyn_cast<NonTypeTemplateParmDecl>(Old)) { | |||
7096 | NonTypeTemplateParmDecl *NewNTTP = cast<NonTypeTemplateParmDecl>(New); | |||
7097 | ||||
7098 | // If we are matching a template template argument to a template | |||
7099 | // template parameter and one of the non-type template parameter types | |||
7100 | // is dependent, then we must wait until template instantiation time | |||
7101 | // to actually compare the arguments. | |||
7102 | if (Kind == Sema::TPL_TemplateTemplateArgumentMatch && | |||
7103 | (OldNTTP->getType()->isDependentType() || | |||
7104 | NewNTTP->getType()->isDependentType())) | |||
7105 | return true; | |||
7106 | ||||
7107 | if (!S.Context.hasSameType(OldNTTP->getType(), NewNTTP->getType())) { | |||
7108 | if (Complain) { | |||
7109 | unsigned NextDiag = diag::err_template_nontype_parm_different_type; | |||
7110 | if (TemplateArgLoc.isValid()) { | |||
7111 | S.Diag(TemplateArgLoc, | |||
7112 | diag::err_template_arg_template_params_mismatch); | |||
7113 | NextDiag = diag::note_template_nontype_parm_different_type; | |||
7114 | } | |||
7115 | S.Diag(NewNTTP->getLocation(), NextDiag) | |||
7116 | << NewNTTP->getType() | |||
7117 | << (Kind != Sema::TPL_TemplateMatch); | |||
7118 | S.Diag(OldNTTP->getLocation(), | |||
7119 | diag::note_template_nontype_parm_prev_declaration) | |||
7120 | << OldNTTP->getType(); | |||
7121 | } | |||
7122 | ||||
7123 | return false; | |||
7124 | } | |||
7125 | ||||
7126 | return true; | |||
7127 | } | |||
7128 | ||||
7129 | // For template template parameters, check the template parameter types. | |||
7130 | // The template parameter lists of template template | |||
7131 | // parameters must agree. | |||
7132 | if (TemplateTemplateParmDecl *OldTTP | |||
7133 | = dyn_cast<TemplateTemplateParmDecl>(Old)) { | |||
7134 | TemplateTemplateParmDecl *NewTTP = cast<TemplateTemplateParmDecl>(New); | |||
7135 | return S.TemplateParameterListsAreEqual(NewTTP->getTemplateParameters(), | |||
7136 | OldTTP->getTemplateParameters(), | |||
7137 | Complain, | |||
7138 | (Kind == Sema::TPL_TemplateMatch | |||
7139 | ? Sema::TPL_TemplateTemplateParmMatch | |||
7140 | : Kind), | |||
7141 | TemplateArgLoc); | |||
7142 | } | |||
7143 | ||||
7144 | return true; | |||
7145 | } | |||
7146 | ||||
7147 | /// Diagnose a known arity mismatch when comparing template argument | |||
7148 | /// lists. | |||
7149 | static | |||
7150 | void DiagnoseTemplateParameterListArityMismatch(Sema &S, | |||
7151 | TemplateParameterList *New, | |||
7152 | TemplateParameterList *Old, | |||
7153 | Sema::TemplateParameterListEqualKind Kind, | |||
7154 | SourceLocation TemplateArgLoc) { | |||
7155 | unsigned NextDiag = diag::err_template_param_list_different_arity; | |||
7156 | if (TemplateArgLoc.isValid()) { | |||
7157 | S.Diag(TemplateArgLoc, diag::err_template_arg_template_params_mismatch); | |||
7158 | NextDiag = diag::note_template_param_list_different_arity; | |||
7159 | } | |||
7160 | S.Diag(New->getTemplateLoc(), NextDiag) | |||
7161 | << (New->size() > Old->size()) | |||
7162 | << (Kind != Sema::TPL_TemplateMatch) | |||
7163 | << SourceRange(New->getTemplateLoc(), New->getRAngleLoc()); | |||
7164 | S.Diag(Old->getTemplateLoc(), diag::note_template_prev_declaration) | |||
7165 | << (Kind != Sema::TPL_TemplateMatch) | |||
7166 | << SourceRange(Old->getTemplateLoc(), Old->getRAngleLoc()); | |||
7167 | } | |||
7168 | ||||
7169 | /// Determine whether the given template parameter lists are | |||
7170 | /// equivalent. | |||
7171 | /// | |||
7172 | /// \param New The new template parameter list, typically written in the | |||
7173 | /// source code as part of a new template declaration. | |||
7174 | /// | |||
7175 | /// \param Old The old template parameter list, typically found via | |||
7176 | /// name lookup of the template declared with this template parameter | |||
7177 | /// list. | |||
7178 | /// | |||
7179 | /// \param Complain If true, this routine will produce a diagnostic if | |||
7180 | /// the template parameter lists are not equivalent. | |||
7181 | /// | |||
7182 | /// \param Kind describes how we are to match the template parameter lists. | |||
7183 | /// | |||
7184 | /// \param TemplateArgLoc If this source location is valid, then we | |||
7185 | /// are actually checking the template parameter list of a template | |||
7186 | /// argument (New) against the template parameter list of its | |||
7187 | /// corresponding template template parameter (Old). We produce | |||
7188 | /// slightly different diagnostics in this scenario. | |||
7189 | /// | |||
7190 | /// \returns True if the template parameter lists are equal, false | |||
7191 | /// otherwise. | |||
7192 | bool | |||
7193 | Sema::TemplateParameterListsAreEqual(TemplateParameterList *New, | |||
7194 | TemplateParameterList *Old, | |||
7195 | bool Complain, | |||
7196 | TemplateParameterListEqualKind Kind, | |||
7197 | SourceLocation TemplateArgLoc) { | |||
7198 | if (Old->size() != New->size() && Kind != TPL_TemplateTemplateArgumentMatch) { | |||
7199 | if (Complain) | |||
7200 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, | |||
7201 | TemplateArgLoc); | |||
7202 | ||||
7203 | return false; | |||
7204 | } | |||
7205 | ||||
7206 | // C++0x [temp.arg.template]p3: | |||
7207 | // A template-argument matches a template template-parameter (call it P) | |||
7208 | // when each of the template parameters in the template-parameter-list of | |||
7209 | // the template-argument's corresponding class template or alias template | |||
7210 | // (call it A) matches the corresponding template parameter in the | |||
7211 | // template-parameter-list of P. [...] | |||
7212 | TemplateParameterList::iterator NewParm = New->begin(); | |||
7213 | TemplateParameterList::iterator NewParmEnd = New->end(); | |||
7214 | for (TemplateParameterList::iterator OldParm = Old->begin(), | |||
7215 | OldParmEnd = Old->end(); | |||
7216 | OldParm != OldParmEnd; ++OldParm) { | |||
7217 | if (Kind != TPL_TemplateTemplateArgumentMatch || | |||
7218 | !(*OldParm)->isTemplateParameterPack()) { | |||
7219 | if (NewParm == NewParmEnd) { | |||
7220 | if (Complain) | |||
7221 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, | |||
7222 | TemplateArgLoc); | |||
7223 | ||||
7224 | return false; | |||
7225 | } | |||
7226 | ||||
7227 | if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain, | |||
7228 | Kind, TemplateArgLoc)) | |||
7229 | return false; | |||
7230 | ||||
7231 | ++NewParm; | |||
7232 | continue; | |||
7233 | } | |||
7234 | ||||
7235 | // C++0x [temp.arg.template]p3: | |||
7236 | // [...] When P's template- parameter-list contains a template parameter | |||
7237 | // pack (14.5.3), the template parameter pack will match zero or more | |||
7238 | // template parameters or template parameter packs in the | |||
7239 | // template-parameter-list of A with the same type and form as the | |||
7240 | // template parameter pack in P (ignoring whether those template | |||
7241 | // parameters are template parameter packs). | |||
7242 | for (; NewParm != NewParmEnd; ++NewParm) { | |||
7243 | if (!MatchTemplateParameterKind(*this, *NewParm, *OldParm, Complain, | |||
7244 | Kind, TemplateArgLoc)) | |||
7245 | return false; | |||
7246 | } | |||
7247 | } | |||
7248 | ||||
7249 | // Make sure we exhausted all of the arguments. | |||
7250 | if (NewParm != NewParmEnd) { | |||
7251 | if (Complain) | |||
7252 | DiagnoseTemplateParameterListArityMismatch(*this, New, Old, Kind, | |||
7253 | TemplateArgLoc); | |||
7254 | ||||
7255 | return false; | |||
7256 | } | |||
7257 | ||||
7258 | return true; | |||
7259 | } | |||
7260 | ||||
7261 | /// Check whether a template can be declared within this scope. | |||
7262 | /// | |||
7263 | /// If the template declaration is valid in this scope, returns | |||
7264 | /// false. Otherwise, issues a diagnostic and returns true. | |||
7265 | bool | |||
7266 | Sema::CheckTemplateDeclScope(Scope *S, TemplateParameterList *TemplateParams) { | |||
7267 | if (!S) | |||
7268 | return false; | |||
7269 | ||||
7270 | // Find the nearest enclosing declaration scope. | |||
7271 | while ((S->getFlags() & Scope::DeclScope) == 0 || | |||
7272 | (S->getFlags() & Scope::TemplateParamScope) != 0) | |||
7273 | S = S->getParent(); | |||
7274 | ||||
7275 | // C++ [temp]p4: | |||
7276 | // A template [...] shall not have C linkage. | |||
7277 | DeclContext *Ctx = S->getEntity(); | |||
7278 | if (Ctx && Ctx->isExternCContext()) { | |||
7279 | Diag(TemplateParams->getTemplateLoc(), diag::err_template_linkage) | |||
7280 | << TemplateParams->getSourceRange(); | |||
7281 | if (const LinkageSpecDecl *LSD = Ctx->getExternCContext()) | |||
7282 | Diag(LSD->getExternLoc(), diag::note_extern_c_begins_here); | |||
7283 | return true; | |||
7284 | } | |||
7285 | Ctx = Ctx->getRedeclContext(); | |||
7286 | ||||
7287 | // C++ [temp]p2: | |||
7288 | // A template-declaration can appear only as a namespace scope or | |||
7289 | // class scope declaration. | |||
7290 | if (Ctx) { | |||
7291 | if (Ctx->isFileContext()) | |||
7292 | return false; | |||
7293 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Ctx)) { | |||
7294 | // C++ [temp.mem]p2: | |||
7295 | // A local class shall not have member templates. | |||
7296 | if (RD->isLocalClass()) | |||
7297 | return Diag(TemplateParams->getTemplateLoc(), | |||
7298 | diag::err_template_inside_local_class) | |||
7299 | << TemplateParams->getSourceRange(); | |||
7300 | else | |||
7301 | return false; | |||
7302 | } | |||
7303 | } | |||
7304 | ||||
7305 | return Diag(TemplateParams->getTemplateLoc(), | |||
7306 | diag::err_template_outside_namespace_or_class_scope) | |||
7307 | << TemplateParams->getSourceRange(); | |||
7308 | } | |||
7309 | ||||
7310 | /// Determine what kind of template specialization the given declaration | |||
7311 | /// is. | |||
7312 | static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D) { | |||
7313 | if (!D) | |||
7314 | return TSK_Undeclared; | |||
7315 | ||||
7316 | if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) | |||
7317 | return Record->getTemplateSpecializationKind(); | |||
7318 | if (FunctionDecl *Function = dyn_cast<FunctionDecl>(D)) | |||
7319 | return Function->getTemplateSpecializationKind(); | |||
7320 | if (VarDecl *Var = dyn_cast<VarDecl>(D)) | |||
7321 | return Var->getTemplateSpecializationKind(); | |||
7322 | ||||
7323 | return TSK_Undeclared; | |||
7324 | } | |||
7325 | ||||
7326 | /// Check whether a specialization is well-formed in the current | |||
7327 | /// context. | |||
7328 | /// | |||
7329 | /// This routine determines whether a template specialization can be declared | |||
7330 | /// in the current context (C++ [temp.expl.spec]p2). | |||
7331 | /// | |||
7332 | /// \param S the semantic analysis object for which this check is being | |||
7333 | /// performed. | |||
7334 | /// | |||
7335 | /// \param Specialized the entity being specialized or instantiated, which | |||
7336 | /// may be a kind of template (class template, function template, etc.) or | |||
7337 | /// a member of a class template (member function, static data member, | |||
7338 | /// member class). | |||
7339 | /// | |||
7340 | /// \param PrevDecl the previous declaration of this entity, if any. | |||
7341 | /// | |||
7342 | /// \param Loc the location of the explicit specialization or instantiation of | |||
7343 | /// this entity. | |||
7344 | /// | |||
7345 | /// \param IsPartialSpecialization whether this is a partial specialization of | |||
7346 | /// a class template. | |||
7347 | /// | |||
7348 | /// \returns true if there was an error that we cannot recover from, false | |||
7349 | /// otherwise. | |||
7350 | static bool CheckTemplateSpecializationScope(Sema &S, | |||
7351 | NamedDecl *Specialized, | |||
7352 | NamedDecl *PrevDecl, | |||
7353 | SourceLocation Loc, | |||
7354 | bool IsPartialSpecialization) { | |||
7355 | // Keep these "kind" numbers in sync with the %select statements in the | |||
7356 | // various diagnostics emitted by this routine. | |||
7357 | int EntityKind = 0; | |||
7358 | if (isa<ClassTemplateDecl>(Specialized)) | |||
7359 | EntityKind = IsPartialSpecialization? 1 : 0; | |||
7360 | else if (isa<VarTemplateDecl>(Specialized)) | |||
7361 | EntityKind = IsPartialSpecialization ? 3 : 2; | |||
7362 | else if (isa<FunctionTemplateDecl>(Specialized)) | |||
7363 | EntityKind = 4; | |||
7364 | else if (isa<CXXMethodDecl>(Specialized)) | |||
7365 | EntityKind = 5; | |||
7366 | else if (isa<VarDecl>(Specialized)) | |||
7367 | EntityKind = 6; | |||
7368 | else if (isa<RecordDecl>(Specialized)) | |||
7369 | EntityKind = 7; | |||
7370 | else if (isa<EnumDecl>(Specialized) && S.getLangOpts().CPlusPlus11) | |||
7371 | EntityKind = 8; | |||
7372 | else { | |||
7373 | S.Diag(Loc, diag::err_template_spec_unknown_kind) | |||
7374 | << S.getLangOpts().CPlusPlus11; | |||
7375 | S.Diag(Specialized->getLocation(), diag::note_specialized_entity); | |||
7376 | return true; | |||
7377 | } | |||
7378 | ||||
7379 | // C++ [temp.expl.spec]p2: | |||
7380 | // An explicit specialization may be declared in any scope in which | |||
7381 | // the corresponding primary template may be defined. | |||
7382 | if (S.CurContext->getRedeclContext()->isFunctionOrMethod()) { | |||
7383 | S.Diag(Loc, diag::err_template_spec_decl_function_scope) | |||
7384 | << Specialized; | |||
7385 | return true; | |||
7386 | } | |||
7387 | ||||
7388 | // C++ [temp.class.spec]p6: | |||
7389 | // A class template partial specialization may be declared in any | |||
7390 | // scope in which the primary template may be defined. | |||
7391 | DeclContext *SpecializedContext = | |||
7392 | Specialized->getDeclContext()->getRedeclContext(); | |||
7393 | DeclContext *DC = S.CurContext->getRedeclContext(); | |||
7394 | ||||
7395 | // Make sure that this redeclaration (or definition) occurs in the same | |||
7396 | // scope or an enclosing namespace. | |||
7397 | if (!(DC->isFileContext() ? DC->Encloses(SpecializedContext) | |||
7398 | : DC->Equals(SpecializedContext))) { | |||
7399 | if (isa<TranslationUnitDecl>(SpecializedContext)) | |||
7400 | S.Diag(Loc, diag::err_template_spec_redecl_global_scope) | |||
7401 | << EntityKind << Specialized; | |||
7402 | else { | |||
7403 | auto *ND = cast<NamedDecl>(SpecializedContext); | |||
7404 | int Diag = diag::err_template_spec_redecl_out_of_scope; | |||
7405 | if (S.getLangOpts().MicrosoftExt && !DC->isRecord()) | |||
7406 | Diag = diag::ext_ms_template_spec_redecl_out_of_scope; | |||
7407 | S.Diag(Loc, Diag) << EntityKind << Specialized | |||
7408 | << ND << isa<CXXRecordDecl>(ND); | |||
7409 | } | |||
7410 | ||||
7411 | S.Diag(Specialized->getLocation(), diag::note_specialized_entity); | |||
7412 | ||||
7413 | // Don't allow specializing in the wrong class during error recovery. | |||
7414 | // Otherwise, things can go horribly wrong. | |||
7415 | if (DC->isRecord()) | |||
7416 | return true; | |||
7417 | } | |||
7418 | ||||
7419 | return false; | |||
7420 | } | |||
7421 | ||||
7422 | static SourceRange findTemplateParameterInType(unsigned Depth, Expr *E) { | |||
7423 | if (!E->isTypeDependent()) | |||
7424 | return SourceLocation(); | |||
7425 | DependencyChecker Checker(Depth, /*IgnoreNonTypeDependent*/true); | |||
7426 | Checker.TraverseStmt(E); | |||
7427 | if (Checker.MatchLoc.isInvalid()) | |||
7428 | return E->getSourceRange(); | |||
7429 | return Checker.MatchLoc; | |||
7430 | } | |||
7431 | ||||
7432 | static SourceRange findTemplateParameter(unsigned Depth, TypeLoc TL) { | |||
7433 | if (!TL.getType()->isDependentType()) | |||
7434 | return SourceLocation(); | |||
7435 | DependencyChecker Checker(Depth, /*IgnoreNonTypeDependent*/true); | |||
7436 | Checker.TraverseTypeLoc(TL); | |||
7437 | if (Checker.MatchLoc.isInvalid()) | |||
7438 | return TL.getSourceRange(); | |||
7439 | return Checker.MatchLoc; | |||
7440 | } | |||
7441 | ||||
7442 | /// Subroutine of Sema::CheckTemplatePartialSpecializationArgs | |||
7443 | /// that checks non-type template partial specialization arguments. | |||
7444 | static bool CheckNonTypeTemplatePartialSpecializationArgs( | |||
7445 | Sema &S, SourceLocation TemplateNameLoc, NonTypeTemplateParmDecl *Param, | |||
7446 | const TemplateArgument *Args, unsigned NumArgs, bool IsDefaultArgument) { | |||
7447 | for (unsigned I = 0; I != NumArgs; ++I) { | |||
7448 | if (Args[I].getKind() == TemplateArgument::Pack) { | |||
7449 | if (CheckNonTypeTemplatePartialSpecializationArgs( | |||
7450 | S, TemplateNameLoc, Param, Args[I].pack_begin(), | |||
7451 | Args[I].pack_size(), IsDefaultArgument)) | |||
7452 | return true; | |||
7453 | ||||
7454 | continue; | |||
7455 | } | |||
7456 | ||||
7457 | if (Args[I].getKind() != TemplateArgument::Expression) | |||
7458 | continue; | |||
7459 | ||||
7460 | Expr *ArgExpr = Args[I].getAsExpr(); | |||
7461 | ||||
7462 | // We can have a pack expansion of any of the bullets below. | |||
7463 | if (PackExpansionExpr *Expansion = dyn_cast<PackExpansionExpr>(ArgExpr)) | |||
7464 | ArgExpr = Expansion->getPattern(); | |||
7465 | ||||
7466 | // Strip off any implicit casts we added as part of type checking. | |||
7467 | while (ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(ArgExpr)) | |||
7468 | ArgExpr = ICE->getSubExpr(); | |||
7469 | ||||
7470 | // C++ [temp.class.spec]p8: | |||
7471 | // A non-type argument is non-specialized if it is the name of a | |||
7472 | // non-type parameter. All other non-type arguments are | |||
7473 | // specialized. | |||
7474 | // | |||
7475 | // Below, we check the two conditions that only apply to | |||
7476 | // specialized non-type arguments, so skip any non-specialized | |||
7477 | // arguments. | |||
7478 | if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(ArgExpr)) | |||
7479 | if (isa<NonTypeTemplateParmDecl>(DRE->getDecl())) | |||
7480 | continue; | |||
7481 | ||||
7482 | // C++ [temp.class.spec]p9: | |||
7483 | // Within the argument list of a class template partial | |||
7484 | // specialization, the following restrictions apply: | |||
7485 | // -- A partially specialized non-type argument expression | |||
7486 | // shall not involve a template parameter of the partial | |||
7487 | // specialization except when the argument expression is a | |||
7488 | // simple identifier. | |||
7489 | // -- The type of a template parameter corresponding to a | |||
7490 | // specialized non-type argument shall not be dependent on a | |||
7491 | // parameter of the specialization. | |||
7492 | // DR1315 removes the first bullet, leaving an incoherent set of rules. | |||
7493 | // We implement a compromise between the original rules and DR1315: | |||
7494 | // -- A specialized non-type template argument shall not be | |||
7495 | // type-dependent and the corresponding template parameter | |||
7496 | // shall have a non-dependent type. | |||
7497 | SourceRange ParamUseRange = | |||
7498 | findTemplateParameterInType(Param->getDepth(), ArgExpr); | |||
7499 | if (ParamUseRange.isValid()) { | |||
7500 | if (IsDefaultArgument) { | |||
7501 | S.Diag(TemplateNameLoc, | |||
7502 | diag::err_dependent_non_type_arg_in_partial_spec); | |||
7503 | S.Diag(ParamUseRange.getBegin(), | |||
7504 | diag::note_dependent_non_type_default_arg_in_partial_spec) | |||
7505 | << ParamUseRange; | |||
7506 | } else { | |||
7507 | S.Diag(ParamUseRange.getBegin(), | |||
7508 | diag::err_dependent_non_type_arg_in_partial_spec) | |||
7509 | << ParamUseRange; | |||
7510 | } | |||
7511 | return true; | |||
7512 | } | |||
7513 | ||||
7514 | ParamUseRange = findTemplateParameter( | |||
7515 | Param->getDepth(), Param->getTypeSourceInfo()->getTypeLoc()); | |||
7516 | if (ParamUseRange.isValid()) { | |||
7517 | S.Diag(IsDefaultArgument ? TemplateNameLoc : ArgExpr->getBeginLoc(), | |||
7518 | diag::err_dependent_typed_non_type_arg_in_partial_spec) | |||
7519 | << Param->getType(); | |||
7520 | S.Diag(Param->getLocation(), diag::note_template_param_here) | |||
7521 | << (IsDefaultArgument ? ParamUseRange : SourceRange()) | |||
7522 | << ParamUseRange; | |||
7523 | return true; | |||
7524 | } | |||
7525 | } | |||
7526 | ||||
7527 | return false; | |||
7528 | } | |||
7529 | ||||
7530 | /// Check the non-type template arguments of a class template | |||
7531 | /// partial specialization according to C++ [temp.class.spec]p9. | |||
7532 | /// | |||
7533 | /// \param TemplateNameLoc the location of the template name. | |||
7534 | /// \param PrimaryTemplate the template parameters of the primary class | |||
7535 | /// template. | |||
7536 | /// \param NumExplicit the number of explicitly-specified template arguments. | |||
7537 | /// \param TemplateArgs the template arguments of the class template | |||
7538 | /// partial specialization. | |||
7539 | /// | |||
7540 | /// \returns \c true if there was an error, \c false otherwise. | |||
7541 | bool Sema::CheckTemplatePartialSpecializationArgs( | |||
7542 | SourceLocation TemplateNameLoc, TemplateDecl *PrimaryTemplate, | |||
7543 | unsigned NumExplicit, ArrayRef<TemplateArgument> TemplateArgs) { | |||
7544 | // We have to be conservative when checking a template in a dependent | |||
7545 | // context. | |||
7546 | if (PrimaryTemplate->getDeclContext()->isDependentContext()) | |||
7547 | return false; | |||
7548 | ||||
7549 | TemplateParameterList *TemplateParams = | |||
7550 | PrimaryTemplate->getTemplateParameters(); | |||
7551 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { | |||
7552 | NonTypeTemplateParmDecl *Param | |||
7553 | = dyn_cast<NonTypeTemplateParmDecl>(TemplateParams->getParam(I)); | |||
7554 | if (!Param) | |||
7555 | continue; | |||
7556 | ||||
7557 | if (CheckNonTypeTemplatePartialSpecializationArgs(*this, TemplateNameLoc, | |||
7558 | Param, &TemplateArgs[I], | |||
7559 | 1, I >= NumExplicit)) | |||
7560 | return true; | |||
7561 | } | |||
7562 | ||||
7563 | return false; | |||
7564 | } | |||
7565 | ||||
7566 | DeclResult Sema::ActOnClassTemplateSpecialization( | |||
7567 | Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc, | |||
7568 | SourceLocation ModulePrivateLoc, TemplateIdAnnotation &TemplateId, | |||
7569 | const ParsedAttributesView &Attr, | |||
7570 | MultiTemplateParamsArg TemplateParameterLists, SkipBodyInfo *SkipBody) { | |||
7571 | assert(TUK != TUK_Reference && "References are not specializations")((TUK != TUK_Reference && "References are not specializations" ) ? static_cast<void> (0) : __assert_fail ("TUK != TUK_Reference && \"References are not specializations\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 7571, __PRETTY_FUNCTION__)); | |||
7572 | ||||
7573 | CXXScopeSpec &SS = TemplateId.SS; | |||
7574 | ||||
7575 | // NOTE: KWLoc is the location of the tag keyword. This will instead | |||
7576 | // store the location of the outermost template keyword in the declaration. | |||
7577 | SourceLocation TemplateKWLoc = TemplateParameterLists.size() > 0 | |||
7578 | ? TemplateParameterLists[0]->getTemplateLoc() : KWLoc; | |||
7579 | SourceLocation TemplateNameLoc = TemplateId.TemplateNameLoc; | |||
7580 | SourceLocation LAngleLoc = TemplateId.LAngleLoc; | |||
7581 | SourceLocation RAngleLoc = TemplateId.RAngleLoc; | |||
7582 | ||||
7583 | // Find the class template we're specializing | |||
7584 | TemplateName Name = TemplateId.Template.get(); | |||
7585 | ClassTemplateDecl *ClassTemplate | |||
7586 | = dyn_cast_or_null<ClassTemplateDecl>(Name.getAsTemplateDecl()); | |||
7587 | ||||
7588 | if (!ClassTemplate) { | |||
7589 | Diag(TemplateNameLoc, diag::err_not_class_template_specialization) | |||
7590 | << (Name.getAsTemplateDecl() && | |||
7591 | isa<TemplateTemplateParmDecl>(Name.getAsTemplateDecl())); | |||
7592 | return true; | |||
7593 | } | |||
7594 | ||||
7595 | bool isMemberSpecialization = false; | |||
7596 | bool isPartialSpecialization = false; | |||
7597 | ||||
7598 | // Check the validity of the template headers that introduce this | |||
7599 | // template. | |||
7600 | // FIXME: We probably shouldn't complain about these headers for | |||
7601 | // friend declarations. | |||
7602 | bool Invalid = false; | |||
7603 | TemplateParameterList *TemplateParams = | |||
7604 | MatchTemplateParametersToScopeSpecifier( | |||
7605 | KWLoc, TemplateNameLoc, SS, &TemplateId, | |||
7606 | TemplateParameterLists, TUK == TUK_Friend, isMemberSpecialization, | |||
7607 | Invalid); | |||
7608 | if (Invalid) | |||
7609 | return true; | |||
7610 | ||||
7611 | if (TemplateParams && TemplateParams->size() > 0) { | |||
7612 | isPartialSpecialization = true; | |||
7613 | ||||
7614 | if (TUK == TUK_Friend) { | |||
7615 | Diag(KWLoc, diag::err_partial_specialization_friend) | |||
7616 | << SourceRange(LAngleLoc, RAngleLoc); | |||
7617 | return true; | |||
7618 | } | |||
7619 | ||||
7620 | // C++ [temp.class.spec]p10: | |||
7621 | // The template parameter list of a specialization shall not | |||
7622 | // contain default template argument values. | |||
7623 | for (unsigned I = 0, N = TemplateParams->size(); I != N; ++I) { | |||
7624 | Decl *Param = TemplateParams->getParam(I); | |||
7625 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) { | |||
7626 | if (TTP->hasDefaultArgument()) { | |||
7627 | Diag(TTP->getDefaultArgumentLoc(), | |||
7628 | diag::err_default_arg_in_partial_spec); | |||
7629 | TTP->removeDefaultArgument(); | |||
7630 | } | |||
7631 | } else if (NonTypeTemplateParmDecl *NTTP | |||
7632 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { | |||
7633 | if (Expr *DefArg = NTTP->getDefaultArgument()) { | |||
7634 | Diag(NTTP->getDefaultArgumentLoc(), | |||
7635 | diag::err_default_arg_in_partial_spec) | |||
7636 | << DefArg->getSourceRange(); | |||
7637 | NTTP->removeDefaultArgument(); | |||
7638 | } | |||
7639 | } else { | |||
7640 | TemplateTemplateParmDecl *TTP = cast<TemplateTemplateParmDecl>(Param); | |||
7641 | if (TTP->hasDefaultArgument()) { | |||
7642 | Diag(TTP->getDefaultArgument().getLocation(), | |||
7643 | diag::err_default_arg_in_partial_spec) | |||
7644 | << TTP->getDefaultArgument().getSourceRange(); | |||
7645 | TTP->removeDefaultArgument(); | |||
7646 | } | |||
7647 | } | |||
7648 | } | |||
7649 | } else if (TemplateParams) { | |||
7650 | if (TUK == TUK_Friend) | |||
7651 | Diag(KWLoc, diag::err_template_spec_friend) | |||
7652 | << FixItHint::CreateRemoval( | |||
7653 | SourceRange(TemplateParams->getTemplateLoc(), | |||
7654 | TemplateParams->getRAngleLoc())) | |||
7655 | << SourceRange(LAngleLoc, RAngleLoc); | |||
7656 | } else { | |||
7657 | assert(TUK == TUK_Friend && "should have a 'template<>' for this decl")((TUK == TUK_Friend && "should have a 'template<>' for this decl" ) ? static_cast<void> (0) : __assert_fail ("TUK == TUK_Friend && \"should have a 'template<>' for this decl\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 7657, __PRETTY_FUNCTION__)); | |||
7658 | } | |||
7659 | ||||
7660 | // Check that the specialization uses the same tag kind as the | |||
7661 | // original template. | |||
7662 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | |||
7663 | assert(Kind != TTK_Enum && "Invalid enum tag in class template spec!")((Kind != TTK_Enum && "Invalid enum tag in class template spec!" ) ? static_cast<void> (0) : __assert_fail ("Kind != TTK_Enum && \"Invalid enum tag in class template spec!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 7663, __PRETTY_FUNCTION__)); | |||
7664 | if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), | |||
7665 | Kind, TUK == TUK_Definition, KWLoc, | |||
7666 | ClassTemplate->getIdentifier())) { | |||
7667 | Diag(KWLoc, diag::err_use_with_wrong_tag) | |||
7668 | << ClassTemplate | |||
7669 | << FixItHint::CreateReplacement(KWLoc, | |||
7670 | ClassTemplate->getTemplatedDecl()->getKindName()); | |||
7671 | Diag(ClassTemplate->getTemplatedDecl()->getLocation(), | |||
7672 | diag::note_previous_use); | |||
7673 | Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); | |||
7674 | } | |||
7675 | ||||
7676 | // Translate the parser's template argument list in our AST format. | |||
7677 | TemplateArgumentListInfo TemplateArgs = | |||
7678 | makeTemplateArgumentListInfo(*this, TemplateId); | |||
7679 | ||||
7680 | // Check for unexpanded parameter packs in any of the template arguments. | |||
7681 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) | |||
7682 | if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], | |||
7683 | UPPC_PartialSpecialization)) | |||
7684 | return true; | |||
7685 | ||||
7686 | // Check that the template argument list is well-formed for this | |||
7687 | // template. | |||
7688 | SmallVector<TemplateArgument, 4> Converted; | |||
7689 | if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, | |||
7690 | TemplateArgs, false, Converted)) | |||
7691 | return true; | |||
7692 | ||||
7693 | // Find the class template (partial) specialization declaration that | |||
7694 | // corresponds to these arguments. | |||
7695 | if (isPartialSpecialization) { | |||
7696 | if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, ClassTemplate, | |||
7697 | TemplateArgs.size(), Converted)) | |||
7698 | return true; | |||
7699 | ||||
7700 | // FIXME: Move this to CheckTemplatePartialSpecializationArgs so we | |||
7701 | // also do it during instantiation. | |||
7702 | bool InstantiationDependent; | |||
7703 | if (!Name.isDependent() && | |||
7704 | !TemplateSpecializationType::anyDependentTemplateArguments( | |||
7705 | TemplateArgs.arguments(), InstantiationDependent)) { | |||
7706 | Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) | |||
7707 | << ClassTemplate->getDeclName(); | |||
7708 | isPartialSpecialization = false; | |||
7709 | } | |||
7710 | } | |||
7711 | ||||
7712 | void *InsertPos = nullptr; | |||
7713 | ClassTemplateSpecializationDecl *PrevDecl = nullptr; | |||
7714 | ||||
7715 | if (isPartialSpecialization) | |||
7716 | // FIXME: Template parameter list matters, too | |||
7717 | PrevDecl = ClassTemplate->findPartialSpecialization(Converted, InsertPos); | |||
7718 | else | |||
7719 | PrevDecl = ClassTemplate->findSpecialization(Converted, InsertPos); | |||
7720 | ||||
7721 | ClassTemplateSpecializationDecl *Specialization = nullptr; | |||
7722 | ||||
7723 | // Check whether we can declare a class template specialization in | |||
7724 | // the current scope. | |||
7725 | if (TUK != TUK_Friend && | |||
7726 | CheckTemplateSpecializationScope(*this, ClassTemplate, PrevDecl, | |||
7727 | TemplateNameLoc, | |||
7728 | isPartialSpecialization)) | |||
7729 | return true; | |||
7730 | ||||
7731 | // The canonical type | |||
7732 | QualType CanonType; | |||
7733 | if (isPartialSpecialization) { | |||
7734 | // Build the canonical type that describes the converted template | |||
7735 | // arguments of the class template partial specialization. | |||
7736 | TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); | |||
7737 | CanonType = Context.getTemplateSpecializationType(CanonTemplate, | |||
7738 | Converted); | |||
7739 | ||||
7740 | if (Context.hasSameType(CanonType, | |||
7741 | ClassTemplate->getInjectedClassNameSpecialization())) { | |||
7742 | // C++ [temp.class.spec]p9b3: | |||
7743 | // | |||
7744 | // -- The argument list of the specialization shall not be identical | |||
7745 | // to the implicit argument list of the primary template. | |||
7746 | // | |||
7747 | // This rule has since been removed, because it's redundant given DR1495, | |||
7748 | // but we keep it because it produces better diagnostics and recovery. | |||
7749 | Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) | |||
7750 | << /*class template*/0 << (TUK == TUK_Definition) | |||
7751 | << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); | |||
7752 | return CheckClassTemplate(S, TagSpec, TUK, KWLoc, SS, | |||
7753 | ClassTemplate->getIdentifier(), | |||
7754 | TemplateNameLoc, | |||
7755 | Attr, | |||
7756 | TemplateParams, | |||
7757 | AS_none, /*ModulePrivateLoc=*/SourceLocation(), | |||
7758 | /*FriendLoc*/SourceLocation(), | |||
7759 | TemplateParameterLists.size() - 1, | |||
7760 | TemplateParameterLists.data()); | |||
7761 | } | |||
7762 | ||||
7763 | // Create a new class template partial specialization declaration node. | |||
7764 | ClassTemplatePartialSpecializationDecl *PrevPartial | |||
7765 | = cast_or_null<ClassTemplatePartialSpecializationDecl>(PrevDecl); | |||
7766 | ClassTemplatePartialSpecializationDecl *Partial | |||
7767 | = ClassTemplatePartialSpecializationDecl::Create(Context, Kind, | |||
7768 | ClassTemplate->getDeclContext(), | |||
7769 | KWLoc, TemplateNameLoc, | |||
7770 | TemplateParams, | |||
7771 | ClassTemplate, | |||
7772 | Converted, | |||
7773 | TemplateArgs, | |||
7774 | CanonType, | |||
7775 | PrevPartial); | |||
7776 | SetNestedNameSpecifier(*this, Partial, SS); | |||
7777 | if (TemplateParameterLists.size() > 1 && SS.isSet()) { | |||
7778 | Partial->setTemplateParameterListsInfo( | |||
7779 | Context, TemplateParameterLists.drop_back(1)); | |||
7780 | } | |||
7781 | ||||
7782 | if (!PrevPartial) | |||
7783 | ClassTemplate->AddPartialSpecialization(Partial, InsertPos); | |||
7784 | Specialization = Partial; | |||
7785 | ||||
7786 | // If we are providing an explicit specialization of a member class | |||
7787 | // template specialization, make a note of that. | |||
7788 | if (PrevPartial && PrevPartial->getInstantiatedFromMember()) | |||
7789 | PrevPartial->setMemberSpecialization(); | |||
7790 | ||||
7791 | CheckTemplatePartialSpecialization(Partial); | |||
7792 | } else { | |||
7793 | // Create a new class template specialization declaration node for | |||
7794 | // this explicit specialization or friend declaration. | |||
7795 | Specialization | |||
7796 | = ClassTemplateSpecializationDecl::Create(Context, Kind, | |||
7797 | ClassTemplate->getDeclContext(), | |||
7798 | KWLoc, TemplateNameLoc, | |||
7799 | ClassTemplate, | |||
7800 | Converted, | |||
7801 | PrevDecl); | |||
7802 | SetNestedNameSpecifier(*this, Specialization, SS); | |||
7803 | if (TemplateParameterLists.size() > 0) { | |||
7804 | Specialization->setTemplateParameterListsInfo(Context, | |||
7805 | TemplateParameterLists); | |||
7806 | } | |||
7807 | ||||
7808 | if (!PrevDecl) | |||
7809 | ClassTemplate->AddSpecialization(Specialization, InsertPos); | |||
7810 | ||||
7811 | if (CurContext->isDependentContext()) { | |||
7812 | TemplateName CanonTemplate = Context.getCanonicalTemplateName(Name); | |||
7813 | CanonType = Context.getTemplateSpecializationType( | |||
7814 | CanonTemplate, Converted); | |||
7815 | } else { | |||
7816 | CanonType = Context.getTypeDeclType(Specialization); | |||
7817 | } | |||
7818 | } | |||
7819 | ||||
7820 | // C++ [temp.expl.spec]p6: | |||
7821 | // If a template, a member template or the member of a class template is | |||
7822 | // explicitly specialized then that specialization shall be declared | |||
7823 | // before the first use of that specialization that would cause an implicit | |||
7824 | // instantiation to take place, in every translation unit in which such a | |||
7825 | // use occurs; no diagnostic is required. | |||
7826 | if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { | |||
7827 | bool Okay = false; | |||
7828 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { | |||
7829 | // Is there any previous explicit specialization declaration? | |||
7830 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { | |||
7831 | Okay = true; | |||
7832 | break; | |||
7833 | } | |||
7834 | } | |||
7835 | ||||
7836 | if (!Okay) { | |||
7837 | SourceRange Range(TemplateNameLoc, RAngleLoc); | |||
7838 | Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) | |||
7839 | << Context.getTypeDeclType(Specialization) << Range; | |||
7840 | ||||
7841 | Diag(PrevDecl->getPointOfInstantiation(), | |||
7842 | diag::note_instantiation_required_here) | |||
7843 | << (PrevDecl->getTemplateSpecializationKind() | |||
7844 | != TSK_ImplicitInstantiation); | |||
7845 | return true; | |||
7846 | } | |||
7847 | } | |||
7848 | ||||
7849 | // If this is not a friend, note that this is an explicit specialization. | |||
7850 | if (TUK != TUK_Friend) | |||
7851 | Specialization->setSpecializationKind(TSK_ExplicitSpecialization); | |||
7852 | ||||
7853 | // Check that this isn't a redefinition of this specialization. | |||
7854 | if (TUK == TUK_Definition) { | |||
7855 | RecordDecl *Def = Specialization->getDefinition(); | |||
7856 | NamedDecl *Hidden = nullptr; | |||
7857 | if (Def && SkipBody && !hasVisibleDefinition(Def, &Hidden)) { | |||
7858 | SkipBody->ShouldSkip = true; | |||
7859 | SkipBody->Previous = Def; | |||
7860 | makeMergedDefinitionVisible(Hidden); | |||
7861 | } else if (Def) { | |||
7862 | SourceRange Range(TemplateNameLoc, RAngleLoc); | |||
7863 | Diag(TemplateNameLoc, diag::err_redefinition) << Specialization << Range; | |||
7864 | Diag(Def->getLocation(), diag::note_previous_definition); | |||
7865 | Specialization->setInvalidDecl(); | |||
7866 | return true; | |||
7867 | } | |||
7868 | } | |||
7869 | ||||
7870 | ProcessDeclAttributeList(S, Specialization, Attr); | |||
7871 | ||||
7872 | // Add alignment attributes if necessary; these attributes are checked when | |||
7873 | // the ASTContext lays out the structure. | |||
7874 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { | |||
7875 | AddAlignmentAttributesForRecord(Specialization); | |||
7876 | AddMsStructLayoutForRecord(Specialization); | |||
7877 | } | |||
7878 | ||||
7879 | if (ModulePrivateLoc.isValid()) | |||
7880 | Diag(Specialization->getLocation(), diag::err_module_private_specialization) | |||
7881 | << (isPartialSpecialization? 1 : 0) | |||
7882 | << FixItHint::CreateRemoval(ModulePrivateLoc); | |||
7883 | ||||
7884 | // Build the fully-sugared type for this class template | |||
7885 | // specialization as the user wrote in the specialization | |||
7886 | // itself. This means that we'll pretty-print the type retrieved | |||
7887 | // from the specialization's declaration the way that the user | |||
7888 | // actually wrote the specialization, rather than formatting the | |||
7889 | // name based on the "canonical" representation used to store the | |||
7890 | // template arguments in the specialization. | |||
7891 | TypeSourceInfo *WrittenTy | |||
7892 | = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, | |||
7893 | TemplateArgs, CanonType); | |||
7894 | if (TUK != TUK_Friend) { | |||
7895 | Specialization->setTypeAsWritten(WrittenTy); | |||
7896 | Specialization->setTemplateKeywordLoc(TemplateKWLoc); | |||
7897 | } | |||
7898 | ||||
7899 | // C++ [temp.expl.spec]p9: | |||
7900 | // A template explicit specialization is in the scope of the | |||
7901 | // namespace in which the template was defined. | |||
7902 | // | |||
7903 | // We actually implement this paragraph where we set the semantic | |||
7904 | // context (in the creation of the ClassTemplateSpecializationDecl), | |||
7905 | // but we also maintain the lexical context where the actual | |||
7906 | // definition occurs. | |||
7907 | Specialization->setLexicalDeclContext(CurContext); | |||
7908 | ||||
7909 | // We may be starting the definition of this specialization. | |||
7910 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) | |||
7911 | Specialization->startDefinition(); | |||
7912 | ||||
7913 | if (TUK == TUK_Friend) { | |||
7914 | FriendDecl *Friend = FriendDecl::Create(Context, CurContext, | |||
7915 | TemplateNameLoc, | |||
7916 | WrittenTy, | |||
7917 | /*FIXME:*/KWLoc); | |||
7918 | Friend->setAccess(AS_public); | |||
7919 | CurContext->addDecl(Friend); | |||
7920 | } else { | |||
7921 | // Add the specialization into its lexical context, so that it can | |||
7922 | // be seen when iterating through the list of declarations in that | |||
7923 | // context. However, specializations are not found by name lookup. | |||
7924 | CurContext->addDecl(Specialization); | |||
7925 | } | |||
7926 | ||||
7927 | if (SkipBody && SkipBody->ShouldSkip) | |||
7928 | return SkipBody->Previous; | |||
7929 | ||||
7930 | return Specialization; | |||
7931 | } | |||
7932 | ||||
7933 | Decl *Sema::ActOnTemplateDeclarator(Scope *S, | |||
7934 | MultiTemplateParamsArg TemplateParameterLists, | |||
7935 | Declarator &D) { | |||
7936 | Decl *NewDecl = HandleDeclarator(S, D, TemplateParameterLists); | |||
7937 | ActOnDocumentableDecl(NewDecl); | |||
7938 | return NewDecl; | |||
7939 | } | |||
7940 | ||||
7941 | /// Strips various properties off an implicit instantiation | |||
7942 | /// that has just been explicitly specialized. | |||
7943 | static void StripImplicitInstantiation(NamedDecl *D) { | |||
7944 | D->dropAttr<DLLImportAttr>(); | |||
7945 | D->dropAttr<DLLExportAttr>(); | |||
7946 | ||||
7947 | if (FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) | |||
7948 | FD->setInlineSpecified(false); | |||
7949 | } | |||
7950 | ||||
7951 | /// Compute the diagnostic location for an explicit instantiation | |||
7952 | // declaration or definition. | |||
7953 | static SourceLocation DiagLocForExplicitInstantiation( | |||
7954 | NamedDecl* D, SourceLocation PointOfInstantiation) { | |||
7955 | // Explicit instantiations following a specialization have no effect and | |||
7956 | // hence no PointOfInstantiation. In that case, walk decl backwards | |||
7957 | // until a valid name loc is found. | |||
7958 | SourceLocation PrevDiagLoc = PointOfInstantiation; | |||
7959 | for (Decl *Prev = D; Prev && !PrevDiagLoc.isValid(); | |||
7960 | Prev = Prev->getPreviousDecl()) { | |||
7961 | PrevDiagLoc = Prev->getLocation(); | |||
7962 | } | |||
7963 | assert(PrevDiagLoc.isValid() &&((PrevDiagLoc.isValid() && "Explicit instantiation without point of instantiation?" ) ? static_cast<void> (0) : __assert_fail ("PrevDiagLoc.isValid() && \"Explicit instantiation without point of instantiation?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 7964, __PRETTY_FUNCTION__)) | |||
7964 | "Explicit instantiation without point of instantiation?")((PrevDiagLoc.isValid() && "Explicit instantiation without point of instantiation?" ) ? static_cast<void> (0) : __assert_fail ("PrevDiagLoc.isValid() && \"Explicit instantiation without point of instantiation?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 7964, __PRETTY_FUNCTION__)); | |||
7965 | return PrevDiagLoc; | |||
7966 | } | |||
7967 | ||||
7968 | /// Diagnose cases where we have an explicit template specialization | |||
7969 | /// before/after an explicit template instantiation, producing diagnostics | |||
7970 | /// for those cases where they are required and determining whether the | |||
7971 | /// new specialization/instantiation will have any effect. | |||
7972 | /// | |||
7973 | /// \param NewLoc the location of the new explicit specialization or | |||
7974 | /// instantiation. | |||
7975 | /// | |||
7976 | /// \param NewTSK the kind of the new explicit specialization or instantiation. | |||
7977 | /// | |||
7978 | /// \param PrevDecl the previous declaration of the entity. | |||
7979 | /// | |||
7980 | /// \param PrevTSK the kind of the old explicit specialization or instantiatin. | |||
7981 | /// | |||
7982 | /// \param PrevPointOfInstantiation if valid, indicates where the previus | |||
7983 | /// declaration was instantiated (either implicitly or explicitly). | |||
7984 | /// | |||
7985 | /// \param HasNoEffect will be set to true to indicate that the new | |||
7986 | /// specialization or instantiation has no effect and should be ignored. | |||
7987 | /// | |||
7988 | /// \returns true if there was an error that should prevent the introduction of | |||
7989 | /// the new declaration into the AST, false otherwise. | |||
7990 | bool | |||
7991 | Sema::CheckSpecializationInstantiationRedecl(SourceLocation NewLoc, | |||
7992 | TemplateSpecializationKind NewTSK, | |||
7993 | NamedDecl *PrevDecl, | |||
7994 | TemplateSpecializationKind PrevTSK, | |||
7995 | SourceLocation PrevPointOfInstantiation, | |||
7996 | bool &HasNoEffect) { | |||
7997 | HasNoEffect = false; | |||
7998 | ||||
7999 | switch (NewTSK) { | |||
8000 | case TSK_Undeclared: | |||
8001 | case TSK_ImplicitInstantiation: | |||
8002 | assert((((PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation ) && "previous declaration must be implicit!") ? static_cast <void> (0) : __assert_fail ("(PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && \"previous declaration must be implicit!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8004, __PRETTY_FUNCTION__)) | |||
8003 | (PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) &&(((PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation ) && "previous declaration must be implicit!") ? static_cast <void> (0) : __assert_fail ("(PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && \"previous declaration must be implicit!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8004, __PRETTY_FUNCTION__)) | |||
8004 | "previous declaration must be implicit!")(((PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation ) && "previous declaration must be implicit!") ? static_cast <void> (0) : __assert_fail ("(PrevTSK == TSK_Undeclared || PrevTSK == TSK_ImplicitInstantiation) && \"previous declaration must be implicit!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8004, __PRETTY_FUNCTION__)); | |||
8005 | return false; | |||
8006 | ||||
8007 | case TSK_ExplicitSpecialization: | |||
8008 | switch (PrevTSK) { | |||
8009 | case TSK_Undeclared: | |||
8010 | case TSK_ExplicitSpecialization: | |||
8011 | // Okay, we're just specializing something that is either already | |||
8012 | // explicitly specialized or has merely been mentioned without any | |||
8013 | // instantiation. | |||
8014 | return false; | |||
8015 | ||||
8016 | case TSK_ImplicitInstantiation: | |||
8017 | if (PrevPointOfInstantiation.isInvalid()) { | |||
8018 | // The declaration itself has not actually been instantiated, so it is | |||
8019 | // still okay to specialize it. | |||
8020 | StripImplicitInstantiation(PrevDecl); | |||
8021 | return false; | |||
8022 | } | |||
8023 | // Fall through | |||
8024 | LLVM_FALLTHROUGH[[clang::fallthrough]]; | |||
8025 | ||||
8026 | case TSK_ExplicitInstantiationDeclaration: | |||
8027 | case TSK_ExplicitInstantiationDefinition: | |||
8028 | assert((PrevTSK == TSK_ImplicitInstantiation ||(((PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation .isValid()) && "Explicit instantiation without point of instantiation?" ) ? static_cast<void> (0) : __assert_fail ("(PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && \"Explicit instantiation without point of instantiation?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8030, __PRETTY_FUNCTION__)) | |||
8029 | PrevPointOfInstantiation.isValid()) &&(((PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation .isValid()) && "Explicit instantiation without point of instantiation?" ) ? static_cast<void> (0) : __assert_fail ("(PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && \"Explicit instantiation without point of instantiation?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8030, __PRETTY_FUNCTION__)) | |||
8030 | "Explicit instantiation without point of instantiation?")(((PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation .isValid()) && "Explicit instantiation without point of instantiation?" ) ? static_cast<void> (0) : __assert_fail ("(PrevTSK == TSK_ImplicitInstantiation || PrevPointOfInstantiation.isValid()) && \"Explicit instantiation without point of instantiation?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8030, __PRETTY_FUNCTION__)); | |||
8031 | ||||
8032 | // C++ [temp.expl.spec]p6: | |||
8033 | // If a template, a member template or the member of a class template | |||
8034 | // is explicitly specialized then that specialization shall be declared | |||
8035 | // before the first use of that specialization that would cause an | |||
8036 | // implicit instantiation to take place, in every translation unit in | |||
8037 | // which such a use occurs; no diagnostic is required. | |||
8038 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { | |||
8039 | // Is there any previous explicit specialization declaration? | |||
8040 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) | |||
8041 | return false; | |||
8042 | } | |||
8043 | ||||
8044 | Diag(NewLoc, diag::err_specialization_after_instantiation) | |||
8045 | << PrevDecl; | |||
8046 | Diag(PrevPointOfInstantiation, diag::note_instantiation_required_here) | |||
8047 | << (PrevTSK != TSK_ImplicitInstantiation); | |||
8048 | ||||
8049 | return true; | |||
8050 | } | |||
8051 | llvm_unreachable("The switch over PrevTSK must be exhaustive.")::llvm::llvm_unreachable_internal("The switch over PrevTSK must be exhaustive." , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8051); | |||
8052 | ||||
8053 | case TSK_ExplicitInstantiationDeclaration: | |||
8054 | switch (PrevTSK) { | |||
8055 | case TSK_ExplicitInstantiationDeclaration: | |||
8056 | // This explicit instantiation declaration is redundant (that's okay). | |||
8057 | HasNoEffect = true; | |||
8058 | return false; | |||
8059 | ||||
8060 | case TSK_Undeclared: | |||
8061 | case TSK_ImplicitInstantiation: | |||
8062 | // We're explicitly instantiating something that may have already been | |||
8063 | // implicitly instantiated; that's fine. | |||
8064 | return false; | |||
8065 | ||||
8066 | case TSK_ExplicitSpecialization: | |||
8067 | // C++0x [temp.explicit]p4: | |||
8068 | // For a given set of template parameters, if an explicit instantiation | |||
8069 | // of a template appears after a declaration of an explicit | |||
8070 | // specialization for that template, the explicit instantiation has no | |||
8071 | // effect. | |||
8072 | HasNoEffect = true; | |||
8073 | return false; | |||
8074 | ||||
8075 | case TSK_ExplicitInstantiationDefinition: | |||
8076 | // C++0x [temp.explicit]p10: | |||
8077 | // If an entity is the subject of both an explicit instantiation | |||
8078 | // declaration and an explicit instantiation definition in the same | |||
8079 | // translation unit, the definition shall follow the declaration. | |||
8080 | Diag(NewLoc, | |||
8081 | diag::err_explicit_instantiation_declaration_after_definition); | |||
8082 | ||||
8083 | // Explicit instantiations following a specialization have no effect and | |||
8084 | // hence no PrevPointOfInstantiation. In that case, walk decl backwards | |||
8085 | // until a valid name loc is found. | |||
8086 | Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation), | |||
8087 | diag::note_explicit_instantiation_definition_here); | |||
8088 | HasNoEffect = true; | |||
8089 | return false; | |||
8090 | } | |||
8091 | llvm_unreachable("Unexpected TemplateSpecializationKind!")::llvm::llvm_unreachable_internal("Unexpected TemplateSpecializationKind!" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8091); | |||
8092 | ||||
8093 | case TSK_ExplicitInstantiationDefinition: | |||
8094 | switch (PrevTSK) { | |||
8095 | case TSK_Undeclared: | |||
8096 | case TSK_ImplicitInstantiation: | |||
8097 | // We're explicitly instantiating something that may have already been | |||
8098 | // implicitly instantiated; that's fine. | |||
8099 | return false; | |||
8100 | ||||
8101 | case TSK_ExplicitSpecialization: | |||
8102 | // C++ DR 259, C++0x [temp.explicit]p4: | |||
8103 | // For a given set of template parameters, if an explicit | |||
8104 | // instantiation of a template appears after a declaration of | |||
8105 | // an explicit specialization for that template, the explicit | |||
8106 | // instantiation has no effect. | |||
8107 | Diag(NewLoc, diag::warn_explicit_instantiation_after_specialization) | |||
8108 | << PrevDecl; | |||
8109 | Diag(PrevDecl->getLocation(), | |||
8110 | diag::note_previous_template_specialization); | |||
8111 | HasNoEffect = true; | |||
8112 | return false; | |||
8113 | ||||
8114 | case TSK_ExplicitInstantiationDeclaration: | |||
8115 | // We're explicitly instantiating a definition for something for which we | |||
8116 | // were previously asked to suppress instantiations. That's fine. | |||
8117 | ||||
8118 | // C++0x [temp.explicit]p4: | |||
8119 | // For a given set of template parameters, if an explicit instantiation | |||
8120 | // of a template appears after a declaration of an explicit | |||
8121 | // specialization for that template, the explicit instantiation has no | |||
8122 | // effect. | |||
8123 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { | |||
8124 | // Is there any previous explicit specialization declaration? | |||
8125 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { | |||
8126 | HasNoEffect = true; | |||
8127 | break; | |||
8128 | } | |||
8129 | } | |||
8130 | ||||
8131 | return false; | |||
8132 | ||||
8133 | case TSK_ExplicitInstantiationDefinition: | |||
8134 | // C++0x [temp.spec]p5: | |||
8135 | // For a given template and a given set of template-arguments, | |||
8136 | // - an explicit instantiation definition shall appear at most once | |||
8137 | // in a program, | |||
8138 | ||||
8139 | // MSVCCompat: MSVC silently ignores duplicate explicit instantiations. | |||
8140 | Diag(NewLoc, (getLangOpts().MSVCCompat) | |||
8141 | ? diag::ext_explicit_instantiation_duplicate | |||
8142 | : diag::err_explicit_instantiation_duplicate) | |||
8143 | << PrevDecl; | |||
8144 | Diag(DiagLocForExplicitInstantiation(PrevDecl, PrevPointOfInstantiation), | |||
8145 | diag::note_previous_explicit_instantiation); | |||
8146 | HasNoEffect = true; | |||
8147 | return false; | |||
8148 | } | |||
8149 | } | |||
8150 | ||||
8151 | llvm_unreachable("Missing specialization/instantiation case?")::llvm::llvm_unreachable_internal("Missing specialization/instantiation case?" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8151); | |||
8152 | } | |||
8153 | ||||
8154 | /// Perform semantic analysis for the given dependent function | |||
8155 | /// template specialization. | |||
8156 | /// | |||
8157 | /// The only possible way to get a dependent function template specialization | |||
8158 | /// is with a friend declaration, like so: | |||
8159 | /// | |||
8160 | /// \code | |||
8161 | /// template \<class T> void foo(T); | |||
8162 | /// template \<class T> class A { | |||
8163 | /// friend void foo<>(T); | |||
8164 | /// }; | |||
8165 | /// \endcode | |||
8166 | /// | |||
8167 | /// There really isn't any useful analysis we can do here, so we | |||
8168 | /// just store the information. | |||
8169 | bool | |||
8170 | Sema::CheckDependentFunctionTemplateSpecialization(FunctionDecl *FD, | |||
8171 | const TemplateArgumentListInfo &ExplicitTemplateArgs, | |||
8172 | LookupResult &Previous) { | |||
8173 | // Remove anything from Previous that isn't a function template in | |||
8174 | // the correct context. | |||
8175 | DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); | |||
8176 | LookupResult::Filter F = Previous.makeFilter(); | |||
8177 | enum DiscardReason { NotAFunctionTemplate, NotAMemberOfEnclosing }; | |||
8178 | SmallVector<std::pair<DiscardReason, Decl *>, 8> DiscardedCandidates; | |||
8179 | while (F.hasNext()) { | |||
8180 | NamedDecl *D = F.next()->getUnderlyingDecl(); | |||
8181 | if (!isa<FunctionTemplateDecl>(D)) { | |||
8182 | F.erase(); | |||
8183 | DiscardedCandidates.push_back(std::make_pair(NotAFunctionTemplate, D)); | |||
8184 | continue; | |||
8185 | } | |||
8186 | ||||
8187 | if (!FDLookupContext->InEnclosingNamespaceSetOf( | |||
8188 | D->getDeclContext()->getRedeclContext())) { | |||
8189 | F.erase(); | |||
8190 | DiscardedCandidates.push_back(std::make_pair(NotAMemberOfEnclosing, D)); | |||
8191 | continue; | |||
8192 | } | |||
8193 | } | |||
8194 | F.done(); | |||
8195 | ||||
8196 | if (Previous.empty()) { | |||
8197 | Diag(FD->getLocation(), | |||
8198 | diag::err_dependent_function_template_spec_no_match); | |||
8199 | for (auto &P : DiscardedCandidates) | |||
8200 | Diag(P.second->getLocation(), | |||
8201 | diag::note_dependent_function_template_spec_discard_reason) | |||
8202 | << P.first; | |||
8203 | return true; | |||
8204 | } | |||
8205 | ||||
8206 | FD->setDependentTemplateSpecialization(Context, Previous.asUnresolvedSet(), | |||
8207 | ExplicitTemplateArgs); | |||
8208 | return false; | |||
8209 | } | |||
8210 | ||||
8211 | /// Perform semantic analysis for the given function template | |||
8212 | /// specialization. | |||
8213 | /// | |||
8214 | /// This routine performs all of the semantic analysis required for an | |||
8215 | /// explicit function template specialization. On successful completion, | |||
8216 | /// the function declaration \p FD will become a function template | |||
8217 | /// specialization. | |||
8218 | /// | |||
8219 | /// \param FD the function declaration, which will be updated to become a | |||
8220 | /// function template specialization. | |||
8221 | /// | |||
8222 | /// \param ExplicitTemplateArgs the explicitly-provided template arguments, | |||
8223 | /// if any. Note that this may be valid info even when 0 arguments are | |||
8224 | /// explicitly provided as in, e.g., \c void sort<>(char*, char*); | |||
8225 | /// as it anyway contains info on the angle brackets locations. | |||
8226 | /// | |||
8227 | /// \param Previous the set of declarations that may be specialized by | |||
8228 | /// this function specialization. | |||
8229 | /// | |||
8230 | /// \param QualifiedFriend whether this is a lookup for a qualified friend | |||
8231 | /// declaration with no explicit template argument list that might be | |||
8232 | /// befriending a function template specialization. | |||
8233 | bool Sema::CheckFunctionTemplateSpecialization( | |||
8234 | FunctionDecl *FD, TemplateArgumentListInfo *ExplicitTemplateArgs, | |||
8235 | LookupResult &Previous, bool QualifiedFriend) { | |||
8236 | // The set of function template specializations that could match this | |||
8237 | // explicit function template specialization. | |||
8238 | UnresolvedSet<8> Candidates; | |||
8239 | TemplateSpecCandidateSet FailedCandidates(FD->getLocation(), | |||
8240 | /*ForTakingAddress=*/false); | |||
8241 | ||||
8242 | llvm::SmallDenseMap<FunctionDecl *, TemplateArgumentListInfo, 8> | |||
8243 | ConvertedTemplateArgs; | |||
8244 | ||||
8245 | DeclContext *FDLookupContext = FD->getDeclContext()->getRedeclContext(); | |||
8246 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); | |||
8247 | I != E; ++I) { | |||
8248 | NamedDecl *Ovl = (*I)->getUnderlyingDecl(); | |||
8249 | if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Ovl)) { | |||
8250 | // Only consider templates found within the same semantic lookup scope as | |||
8251 | // FD. | |||
8252 | if (!FDLookupContext->InEnclosingNamespaceSetOf( | |||
8253 | Ovl->getDeclContext()->getRedeclContext())) | |||
8254 | continue; | |||
8255 | ||||
8256 | // When matching a constexpr member function template specialization | |||
8257 | // against the primary template, we don't yet know whether the | |||
8258 | // specialization has an implicit 'const' (because we don't know whether | |||
8259 | // it will be a static member function until we know which template it | |||
8260 | // specializes), so adjust it now assuming it specializes this template. | |||
8261 | QualType FT = FD->getType(); | |||
8262 | if (FD->isConstexpr()) { | |||
8263 | CXXMethodDecl *OldMD = | |||
8264 | dyn_cast<CXXMethodDecl>(FunTmpl->getTemplatedDecl()); | |||
8265 | if (OldMD && OldMD->isConst()) { | |||
8266 | const FunctionProtoType *FPT = FT->castAs<FunctionProtoType>(); | |||
8267 | FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); | |||
8268 | EPI.TypeQuals.addConst(); | |||
8269 | FT = Context.getFunctionType(FPT->getReturnType(), | |||
8270 | FPT->getParamTypes(), EPI); | |||
8271 | } | |||
8272 | } | |||
8273 | ||||
8274 | TemplateArgumentListInfo Args; | |||
8275 | if (ExplicitTemplateArgs) | |||
8276 | Args = *ExplicitTemplateArgs; | |||
8277 | ||||
8278 | // C++ [temp.expl.spec]p11: | |||
8279 | // A trailing template-argument can be left unspecified in the | |||
8280 | // template-id naming an explicit function template specialization | |||
8281 | // provided it can be deduced from the function argument type. | |||
8282 | // Perform template argument deduction to determine whether we may be | |||
8283 | // specializing this template. | |||
8284 | // FIXME: It is somewhat wasteful to build | |||
8285 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); | |||
8286 | FunctionDecl *Specialization = nullptr; | |||
8287 | if (TemplateDeductionResult TDK = DeduceTemplateArguments( | |||
8288 | cast<FunctionTemplateDecl>(FunTmpl->getFirstDecl()), | |||
8289 | ExplicitTemplateArgs ? &Args : nullptr, FT, Specialization, | |||
8290 | Info)) { | |||
8291 | // Template argument deduction failed; record why it failed, so | |||
8292 | // that we can provide nifty diagnostics. | |||
8293 | FailedCandidates.addCandidate().set( | |||
8294 | I.getPair(), FunTmpl->getTemplatedDecl(), | |||
8295 | MakeDeductionFailureInfo(Context, TDK, Info)); | |||
8296 | (void)TDK; | |||
8297 | continue; | |||
8298 | } | |||
8299 | ||||
8300 | // Target attributes are part of the cuda function signature, so | |||
8301 | // the deduced template's cuda target must match that of the | |||
8302 | // specialization. Given that C++ template deduction does not | |||
8303 | // take target attributes into account, we reject candidates | |||
8304 | // here that have a different target. | |||
8305 | if (LangOpts.CUDA && | |||
8306 | IdentifyCUDATarget(Specialization, | |||
8307 | /* IgnoreImplicitHDAttributes = */ true) != | |||
8308 | IdentifyCUDATarget(FD, /* IgnoreImplicitHDAttributes = */ true)) { | |||
8309 | FailedCandidates.addCandidate().set( | |||
8310 | I.getPair(), FunTmpl->getTemplatedDecl(), | |||
8311 | MakeDeductionFailureInfo(Context, TDK_CUDATargetMismatch, Info)); | |||
8312 | continue; | |||
8313 | } | |||
8314 | ||||
8315 | // Record this candidate. | |||
8316 | if (ExplicitTemplateArgs) | |||
8317 | ConvertedTemplateArgs[Specialization] = std::move(Args); | |||
8318 | Candidates.addDecl(Specialization, I.getAccess()); | |||
8319 | } | |||
8320 | } | |||
8321 | ||||
8322 | // For a qualified friend declaration (with no explicit marker to indicate | |||
8323 | // that a template specialization was intended), note all (template and | |||
8324 | // non-template) candidates. | |||
8325 | if (QualifiedFriend && Candidates.empty()) { | |||
8326 | Diag(FD->getLocation(), diag::err_qualified_friend_no_match) | |||
8327 | << FD->getDeclName() << FDLookupContext; | |||
8328 | // FIXME: We should form a single candidate list and diagnose all | |||
8329 | // candidates at once, to get proper sorting and limiting. | |||
8330 | for (auto *OldND : Previous) { | |||
8331 | if (auto *OldFD = dyn_cast<FunctionDecl>(OldND->getUnderlyingDecl())) | |||
8332 | NoteOverloadCandidate(OldND, OldFD, FD->getType(), false); | |||
8333 | } | |||
8334 | FailedCandidates.NoteCandidates(*this, FD->getLocation()); | |||
8335 | return true; | |||
8336 | } | |||
8337 | ||||
8338 | // Find the most specialized function template. | |||
8339 | UnresolvedSetIterator Result = getMostSpecialized( | |||
8340 | Candidates.begin(), Candidates.end(), FailedCandidates, FD->getLocation(), | |||
8341 | PDiag(diag::err_function_template_spec_no_match) << FD->getDeclName(), | |||
8342 | PDiag(diag::err_function_template_spec_ambiguous) | |||
8343 | << FD->getDeclName() << (ExplicitTemplateArgs != nullptr), | |||
8344 | PDiag(diag::note_function_template_spec_matched)); | |||
8345 | ||||
8346 | if (Result == Candidates.end()) | |||
8347 | return true; | |||
8348 | ||||
8349 | // Ignore access information; it doesn't figure into redeclaration checking. | |||
8350 | FunctionDecl *Specialization = cast<FunctionDecl>(*Result); | |||
8351 | ||||
8352 | FunctionTemplateSpecializationInfo *SpecInfo | |||
8353 | = Specialization->getTemplateSpecializationInfo(); | |||
8354 | assert(SpecInfo && "Function template specialization info missing?")((SpecInfo && "Function template specialization info missing?" ) ? static_cast<void> (0) : __assert_fail ("SpecInfo && \"Function template specialization info missing?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8354, __PRETTY_FUNCTION__)); | |||
8355 | ||||
8356 | // Note: do not overwrite location info if previous template | |||
8357 | // specialization kind was explicit. | |||
8358 | TemplateSpecializationKind TSK = SpecInfo->getTemplateSpecializationKind(); | |||
8359 | if (TSK == TSK_Undeclared || TSK == TSK_ImplicitInstantiation) { | |||
8360 | Specialization->setLocation(FD->getLocation()); | |||
8361 | Specialization->setLexicalDeclContext(FD->getLexicalDeclContext()); | |||
8362 | // C++11 [dcl.constexpr]p1: An explicit specialization of a constexpr | |||
8363 | // function can differ from the template declaration with respect to | |||
8364 | // the constexpr specifier. | |||
8365 | // FIXME: We need an update record for this AST mutation. | |||
8366 | // FIXME: What if there are multiple such prior declarations (for instance, | |||
8367 | // from different modules)? | |||
8368 | Specialization->setConstexpr(FD->isConstexpr()); | |||
8369 | } | |||
8370 | ||||
8371 | // FIXME: Check if the prior specialization has a point of instantiation. | |||
8372 | // If so, we have run afoul of . | |||
8373 | ||||
8374 | // If this is a friend declaration, then we're not really declaring | |||
8375 | // an explicit specialization. | |||
8376 | bool isFriend = (FD->getFriendObjectKind() != Decl::FOK_None); | |||
8377 | ||||
8378 | // Check the scope of this explicit specialization. | |||
8379 | if (!isFriend && | |||
8380 | CheckTemplateSpecializationScope(*this, | |||
8381 | Specialization->getPrimaryTemplate(), | |||
8382 | Specialization, FD->getLocation(), | |||
8383 | false)) | |||
8384 | return true; | |||
8385 | ||||
8386 | // C++ [temp.expl.spec]p6: | |||
8387 | // If a template, a member template or the member of a class template is | |||
8388 | // explicitly specialized then that specialization shall be declared | |||
8389 | // before the first use of that specialization that would cause an implicit | |||
8390 | // instantiation to take place, in every translation unit in which such a | |||
8391 | // use occurs; no diagnostic is required. | |||
8392 | bool HasNoEffect = false; | |||
8393 | if (!isFriend && | |||
8394 | CheckSpecializationInstantiationRedecl(FD->getLocation(), | |||
8395 | TSK_ExplicitSpecialization, | |||
8396 | Specialization, | |||
8397 | SpecInfo->getTemplateSpecializationKind(), | |||
8398 | SpecInfo->getPointOfInstantiation(), | |||
8399 | HasNoEffect)) | |||
8400 | return true; | |||
8401 | ||||
8402 | // Mark the prior declaration as an explicit specialization, so that later | |||
8403 | // clients know that this is an explicit specialization. | |||
8404 | if (!isFriend) { | |||
8405 | // Since explicit specializations do not inherit '=delete' from their | |||
8406 | // primary function template - check if the 'specialization' that was | |||
8407 | // implicitly generated (during template argument deduction for partial | |||
8408 | // ordering) from the most specialized of all the function templates that | |||
8409 | // 'FD' could have been specializing, has a 'deleted' definition. If so, | |||
8410 | // first check that it was implicitly generated during template argument | |||
8411 | // deduction by making sure it wasn't referenced, and then reset the deleted | |||
8412 | // flag to not-deleted, so that we can inherit that information from 'FD'. | |||
8413 | if (Specialization->isDeleted() && !SpecInfo->isExplicitSpecialization() && | |||
8414 | !Specialization->getCanonicalDecl()->isReferenced()) { | |||
8415 | // FIXME: This assert will not hold in the presence of modules. | |||
8416 | assert(((Specialization->getCanonicalDecl() == Specialization && "This must be the only existing declaration of this specialization" ) ? static_cast<void> (0) : __assert_fail ("Specialization->getCanonicalDecl() == Specialization && \"This must be the only existing declaration of this specialization\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8418, __PRETTY_FUNCTION__)) | |||
8417 | Specialization->getCanonicalDecl() == Specialization &&((Specialization->getCanonicalDecl() == Specialization && "This must be the only existing declaration of this specialization" ) ? static_cast<void> (0) : __assert_fail ("Specialization->getCanonicalDecl() == Specialization && \"This must be the only existing declaration of this specialization\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8418, __PRETTY_FUNCTION__)) | |||
8418 | "This must be the only existing declaration of this specialization")((Specialization->getCanonicalDecl() == Specialization && "This must be the only existing declaration of this specialization" ) ? static_cast<void> (0) : __assert_fail ("Specialization->getCanonicalDecl() == Specialization && \"This must be the only existing declaration of this specialization\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8418, __PRETTY_FUNCTION__)); | |||
8419 | // FIXME: We need an update record for this AST mutation. | |||
8420 | Specialization->setDeletedAsWritten(false); | |||
8421 | } | |||
8422 | // FIXME: We need an update record for this AST mutation. | |||
8423 | SpecInfo->setTemplateSpecializationKind(TSK_ExplicitSpecialization); | |||
8424 | MarkUnusedFileScopedDecl(Specialization); | |||
8425 | } | |||
8426 | ||||
8427 | // Turn the given function declaration into a function template | |||
8428 | // specialization, with the template arguments from the previous | |||
8429 | // specialization. | |||
8430 | // Take copies of (semantic and syntactic) template argument lists. | |||
8431 | const TemplateArgumentList* TemplArgs = new (Context) | |||
8432 | TemplateArgumentList(Specialization->getTemplateSpecializationArgs()); | |||
8433 | FD->setFunctionTemplateSpecialization( | |||
8434 | Specialization->getPrimaryTemplate(), TemplArgs, /*InsertPos=*/nullptr, | |||
8435 | SpecInfo->getTemplateSpecializationKind(), | |||
8436 | ExplicitTemplateArgs ? &ConvertedTemplateArgs[Specialization] : nullptr); | |||
8437 | ||||
8438 | // A function template specialization inherits the target attributes | |||
8439 | // of its template. (We require the attributes explicitly in the | |||
8440 | // code to match, but a template may have implicit attributes by | |||
8441 | // virtue e.g. of being constexpr, and it passes these implicit | |||
8442 | // attributes on to its specializations.) | |||
8443 | if (LangOpts.CUDA) | |||
8444 | inheritCUDATargetAttrs(FD, *Specialization->getPrimaryTemplate()); | |||
8445 | ||||
8446 | // The "previous declaration" for this function template specialization is | |||
8447 | // the prior function template specialization. | |||
8448 | Previous.clear(); | |||
8449 | Previous.addDecl(Specialization); | |||
8450 | return false; | |||
8451 | } | |||
8452 | ||||
8453 | /// Perform semantic analysis for the given non-template member | |||
8454 | /// specialization. | |||
8455 | /// | |||
8456 | /// This routine performs all of the semantic analysis required for an | |||
8457 | /// explicit member function specialization. On successful completion, | |||
8458 | /// the function declaration \p FD will become a member function | |||
8459 | /// specialization. | |||
8460 | /// | |||
8461 | /// \param Member the member declaration, which will be updated to become a | |||
8462 | /// specialization. | |||
8463 | /// | |||
8464 | /// \param Previous the set of declarations, one of which may be specialized | |||
8465 | /// by this function specialization; the set will be modified to contain the | |||
8466 | /// redeclared member. | |||
8467 | bool | |||
8468 | Sema::CheckMemberSpecialization(NamedDecl *Member, LookupResult &Previous) { | |||
8469 | assert(!isa<TemplateDecl>(Member) && "Only for non-template members")((!isa<TemplateDecl>(Member) && "Only for non-template members" ) ? static_cast<void> (0) : __assert_fail ("!isa<TemplateDecl>(Member) && \"Only for non-template members\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8469, __PRETTY_FUNCTION__)); | |||
8470 | ||||
8471 | // Try to find the member we are instantiating. | |||
8472 | NamedDecl *FoundInstantiation = nullptr; | |||
8473 | NamedDecl *Instantiation = nullptr; | |||
8474 | NamedDecl *InstantiatedFrom = nullptr; | |||
8475 | MemberSpecializationInfo *MSInfo = nullptr; | |||
8476 | ||||
8477 | if (Previous.empty()) { | |||
8478 | // Nowhere to look anyway. | |||
8479 | } else if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Member)) { | |||
8480 | for (LookupResult::iterator I = Previous.begin(), E = Previous.end(); | |||
8481 | I != E; ++I) { | |||
8482 | NamedDecl *D = (*I)->getUnderlyingDecl(); | |||
8483 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) { | |||
8484 | QualType Adjusted = Function->getType(); | |||
8485 | if (!hasExplicitCallingConv(Adjusted)) | |||
8486 | Adjusted = adjustCCAndNoReturn(Adjusted, Method->getType()); | |||
8487 | // This doesn't handle deduced return types, but both function | |||
8488 | // declarations should be undeduced at this point. | |||
8489 | if (Context.hasSameType(Adjusted, Method->getType())) { | |||
8490 | FoundInstantiation = *I; | |||
8491 | Instantiation = Method; | |||
8492 | InstantiatedFrom = Method->getInstantiatedFromMemberFunction(); | |||
8493 | MSInfo = Method->getMemberSpecializationInfo(); | |||
8494 | break; | |||
8495 | } | |||
8496 | } | |||
8497 | } | |||
8498 | } else if (isa<VarDecl>(Member)) { | |||
8499 | VarDecl *PrevVar; | |||
8500 | if (Previous.isSingleResult() && | |||
8501 | (PrevVar = dyn_cast<VarDecl>(Previous.getFoundDecl()))) | |||
8502 | if (PrevVar->isStaticDataMember()) { | |||
8503 | FoundInstantiation = Previous.getRepresentativeDecl(); | |||
8504 | Instantiation = PrevVar; | |||
8505 | InstantiatedFrom = PrevVar->getInstantiatedFromStaticDataMember(); | |||
8506 | MSInfo = PrevVar->getMemberSpecializationInfo(); | |||
8507 | } | |||
8508 | } else if (isa<RecordDecl>(Member)) { | |||
8509 | CXXRecordDecl *PrevRecord; | |||
8510 | if (Previous.isSingleResult() && | |||
8511 | (PrevRecord = dyn_cast<CXXRecordDecl>(Previous.getFoundDecl()))) { | |||
8512 | FoundInstantiation = Previous.getRepresentativeDecl(); | |||
8513 | Instantiation = PrevRecord; | |||
8514 | InstantiatedFrom = PrevRecord->getInstantiatedFromMemberClass(); | |||
8515 | MSInfo = PrevRecord->getMemberSpecializationInfo(); | |||
8516 | } | |||
8517 | } else if (isa<EnumDecl>(Member)) { | |||
8518 | EnumDecl *PrevEnum; | |||
8519 | if (Previous.isSingleResult() && | |||
8520 | (PrevEnum = dyn_cast<EnumDecl>(Previous.getFoundDecl()))) { | |||
8521 | FoundInstantiation = Previous.getRepresentativeDecl(); | |||
8522 | Instantiation = PrevEnum; | |||
8523 | InstantiatedFrom = PrevEnum->getInstantiatedFromMemberEnum(); | |||
8524 | MSInfo = PrevEnum->getMemberSpecializationInfo(); | |||
8525 | } | |||
8526 | } | |||
8527 | ||||
8528 | if (!Instantiation) { | |||
8529 | // There is no previous declaration that matches. Since member | |||
8530 | // specializations are always out-of-line, the caller will complain about | |||
8531 | // this mismatch later. | |||
8532 | return false; | |||
8533 | } | |||
8534 | ||||
8535 | // A member specialization in a friend declaration isn't really declaring | |||
8536 | // an explicit specialization, just identifying a specific (possibly implicit) | |||
8537 | // specialization. Don't change the template specialization kind. | |||
8538 | // | |||
8539 | // FIXME: Is this really valid? Other compilers reject. | |||
8540 | if (Member->getFriendObjectKind() != Decl::FOK_None) { | |||
8541 | // Preserve instantiation information. | |||
8542 | if (InstantiatedFrom && isa<CXXMethodDecl>(Member)) { | |||
8543 | cast<CXXMethodDecl>(Member)->setInstantiationOfMemberFunction( | |||
8544 | cast<CXXMethodDecl>(InstantiatedFrom), | |||
8545 | cast<CXXMethodDecl>(Instantiation)->getTemplateSpecializationKind()); | |||
8546 | } else if (InstantiatedFrom && isa<CXXRecordDecl>(Member)) { | |||
8547 | cast<CXXRecordDecl>(Member)->setInstantiationOfMemberClass( | |||
8548 | cast<CXXRecordDecl>(InstantiatedFrom), | |||
8549 | cast<CXXRecordDecl>(Instantiation)->getTemplateSpecializationKind()); | |||
8550 | } | |||
8551 | ||||
8552 | Previous.clear(); | |||
8553 | Previous.addDecl(FoundInstantiation); | |||
8554 | return false; | |||
8555 | } | |||
8556 | ||||
8557 | // Make sure that this is a specialization of a member. | |||
8558 | if (!InstantiatedFrom) { | |||
8559 | Diag(Member->getLocation(), diag::err_spec_member_not_instantiated) | |||
8560 | << Member; | |||
8561 | Diag(Instantiation->getLocation(), diag::note_specialized_decl); | |||
8562 | return true; | |||
8563 | } | |||
8564 | ||||
8565 | // C++ [temp.expl.spec]p6: | |||
8566 | // If a template, a member template or the member of a class template is | |||
8567 | // explicitly specialized then that specialization shall be declared | |||
8568 | // before the first use of that specialization that would cause an implicit | |||
8569 | // instantiation to take place, in every translation unit in which such a | |||
8570 | // use occurs; no diagnostic is required. | |||
8571 | assert(MSInfo && "Member specialization info missing?")((MSInfo && "Member specialization info missing?") ? static_cast <void> (0) : __assert_fail ("MSInfo && \"Member specialization info missing?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8571, __PRETTY_FUNCTION__)); | |||
8572 | ||||
8573 | bool HasNoEffect = false; | |||
8574 | if (CheckSpecializationInstantiationRedecl(Member->getLocation(), | |||
8575 | TSK_ExplicitSpecialization, | |||
8576 | Instantiation, | |||
8577 | MSInfo->getTemplateSpecializationKind(), | |||
8578 | MSInfo->getPointOfInstantiation(), | |||
8579 | HasNoEffect)) | |||
8580 | return true; | |||
8581 | ||||
8582 | // Check the scope of this explicit specialization. | |||
8583 | if (CheckTemplateSpecializationScope(*this, | |||
8584 | InstantiatedFrom, | |||
8585 | Instantiation, Member->getLocation(), | |||
8586 | false)) | |||
8587 | return true; | |||
8588 | ||||
8589 | // Note that this member specialization is an "instantiation of" the | |||
8590 | // corresponding member of the original template. | |||
8591 | if (auto *MemberFunction = dyn_cast<FunctionDecl>(Member)) { | |||
8592 | FunctionDecl *InstantiationFunction = cast<FunctionDecl>(Instantiation); | |||
8593 | if (InstantiationFunction->getTemplateSpecializationKind() == | |||
8594 | TSK_ImplicitInstantiation) { | |||
8595 | // Explicit specializations of member functions of class templates do not | |||
8596 | // inherit '=delete' from the member function they are specializing. | |||
8597 | if (InstantiationFunction->isDeleted()) { | |||
8598 | // FIXME: This assert will not hold in the presence of modules. | |||
8599 | assert(InstantiationFunction->getCanonicalDecl() ==((InstantiationFunction->getCanonicalDecl() == InstantiationFunction ) ? static_cast<void> (0) : __assert_fail ("InstantiationFunction->getCanonicalDecl() == InstantiationFunction" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8600, __PRETTY_FUNCTION__)) | |||
8600 | InstantiationFunction)((InstantiationFunction->getCanonicalDecl() == InstantiationFunction ) ? static_cast<void> (0) : __assert_fail ("InstantiationFunction->getCanonicalDecl() == InstantiationFunction" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8600, __PRETTY_FUNCTION__)); | |||
8601 | // FIXME: We need an update record for this AST mutation. | |||
8602 | InstantiationFunction->setDeletedAsWritten(false); | |||
8603 | } | |||
8604 | } | |||
8605 | ||||
8606 | MemberFunction->setInstantiationOfMemberFunction( | |||
8607 | cast<CXXMethodDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); | |||
8608 | } else if (auto *MemberVar = dyn_cast<VarDecl>(Member)) { | |||
8609 | MemberVar->setInstantiationOfStaticDataMember( | |||
8610 | cast<VarDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); | |||
8611 | } else if (auto *MemberClass = dyn_cast<CXXRecordDecl>(Member)) { | |||
8612 | MemberClass->setInstantiationOfMemberClass( | |||
8613 | cast<CXXRecordDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); | |||
8614 | } else if (auto *MemberEnum = dyn_cast<EnumDecl>(Member)) { | |||
8615 | MemberEnum->setInstantiationOfMemberEnum( | |||
8616 | cast<EnumDecl>(InstantiatedFrom), TSK_ExplicitSpecialization); | |||
8617 | } else { | |||
8618 | llvm_unreachable("unknown member specialization kind")::llvm::llvm_unreachable_internal("unknown member specialization kind" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8618); | |||
8619 | } | |||
8620 | ||||
8621 | // Save the caller the trouble of having to figure out which declaration | |||
8622 | // this specialization matches. | |||
8623 | Previous.clear(); | |||
8624 | Previous.addDecl(FoundInstantiation); | |||
8625 | return false; | |||
8626 | } | |||
8627 | ||||
8628 | /// Complete the explicit specialization of a member of a class template by | |||
8629 | /// updating the instantiated member to be marked as an explicit specialization. | |||
8630 | /// | |||
8631 | /// \param OrigD The member declaration instantiated from the template. | |||
8632 | /// \param Loc The location of the explicit specialization of the member. | |||
8633 | template<typename DeclT> | |||
8634 | static void completeMemberSpecializationImpl(Sema &S, DeclT *OrigD, | |||
8635 | SourceLocation Loc) { | |||
8636 | if (OrigD->getTemplateSpecializationKind() != TSK_ImplicitInstantiation) | |||
8637 | return; | |||
8638 | ||||
8639 | // FIXME: Inform AST mutation listeners of this AST mutation. | |||
8640 | // FIXME: If there are multiple in-class declarations of the member (from | |||
8641 | // multiple modules, or a declaration and later definition of a member type), | |||
8642 | // should we update all of them? | |||
8643 | OrigD->setTemplateSpecializationKind(TSK_ExplicitSpecialization); | |||
8644 | OrigD->setLocation(Loc); | |||
8645 | } | |||
8646 | ||||
8647 | void Sema::CompleteMemberSpecialization(NamedDecl *Member, | |||
8648 | LookupResult &Previous) { | |||
8649 | NamedDecl *Instantiation = cast<NamedDecl>(Member->getCanonicalDecl()); | |||
8650 | if (Instantiation == Member) | |||
8651 | return; | |||
8652 | ||||
8653 | if (auto *Function = dyn_cast<CXXMethodDecl>(Instantiation)) | |||
8654 | completeMemberSpecializationImpl(*this, Function, Member->getLocation()); | |||
8655 | else if (auto *Var = dyn_cast<VarDecl>(Instantiation)) | |||
8656 | completeMemberSpecializationImpl(*this, Var, Member->getLocation()); | |||
8657 | else if (auto *Record = dyn_cast<CXXRecordDecl>(Instantiation)) | |||
8658 | completeMemberSpecializationImpl(*this, Record, Member->getLocation()); | |||
8659 | else if (auto *Enum = dyn_cast<EnumDecl>(Instantiation)) | |||
8660 | completeMemberSpecializationImpl(*this, Enum, Member->getLocation()); | |||
8661 | else | |||
8662 | llvm_unreachable("unknown member specialization kind")::llvm::llvm_unreachable_internal("unknown member specialization kind" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8662); | |||
8663 | } | |||
8664 | ||||
8665 | /// Check the scope of an explicit instantiation. | |||
8666 | /// | |||
8667 | /// \returns true if a serious error occurs, false otherwise. | |||
8668 | static bool CheckExplicitInstantiationScope(Sema &S, NamedDecl *D, | |||
8669 | SourceLocation InstLoc, | |||
8670 | bool WasQualifiedName) { | |||
8671 | DeclContext *OrigContext= D->getDeclContext()->getEnclosingNamespaceContext(); | |||
8672 | DeclContext *CurContext = S.CurContext->getRedeclContext(); | |||
8673 | ||||
8674 | if (CurContext->isRecord()) { | |||
8675 | S.Diag(InstLoc, diag::err_explicit_instantiation_in_class) | |||
8676 | << D; | |||
8677 | return true; | |||
8678 | } | |||
8679 | ||||
8680 | // C++11 [temp.explicit]p3: | |||
8681 | // An explicit instantiation shall appear in an enclosing namespace of its | |||
8682 | // template. If the name declared in the explicit instantiation is an | |||
8683 | // unqualified name, the explicit instantiation shall appear in the | |||
8684 | // namespace where its template is declared or, if that namespace is inline | |||
8685 | // (7.3.1), any namespace from its enclosing namespace set. | |||
8686 | // | |||
8687 | // This is DR275, which we do not retroactively apply to C++98/03. | |||
8688 | if (WasQualifiedName) { | |||
8689 | if (CurContext->Encloses(OrigContext)) | |||
8690 | return false; | |||
8691 | } else { | |||
8692 | if (CurContext->InEnclosingNamespaceSetOf(OrigContext)) | |||
8693 | return false; | |||
8694 | } | |||
8695 | ||||
8696 | if (NamespaceDecl *NS = dyn_cast<NamespaceDecl>(OrigContext)) { | |||
8697 | if (WasQualifiedName) | |||
8698 | S.Diag(InstLoc, | |||
8699 | S.getLangOpts().CPlusPlus11? | |||
8700 | diag::err_explicit_instantiation_out_of_scope : | |||
8701 | diag::warn_explicit_instantiation_out_of_scope_0x) | |||
8702 | << D << NS; | |||
8703 | else | |||
8704 | S.Diag(InstLoc, | |||
8705 | S.getLangOpts().CPlusPlus11? | |||
8706 | diag::err_explicit_instantiation_unqualified_wrong_namespace : | |||
8707 | diag::warn_explicit_instantiation_unqualified_wrong_namespace_0x) | |||
8708 | << D << NS; | |||
8709 | } else | |||
8710 | S.Diag(InstLoc, | |||
8711 | S.getLangOpts().CPlusPlus11? | |||
8712 | diag::err_explicit_instantiation_must_be_global : | |||
8713 | diag::warn_explicit_instantiation_must_be_global_0x) | |||
8714 | << D; | |||
8715 | S.Diag(D->getLocation(), diag::note_explicit_instantiation_here); | |||
8716 | return false; | |||
8717 | } | |||
8718 | ||||
8719 | /// Common checks for whether an explicit instantiation of \p D is valid. | |||
8720 | static bool CheckExplicitInstantiation(Sema &S, NamedDecl *D, | |||
8721 | SourceLocation InstLoc, | |||
8722 | bool WasQualifiedName, | |||
8723 | TemplateSpecializationKind TSK) { | |||
8724 | // C++ [temp.explicit]p13: | |||
8725 | // An explicit instantiation declaration shall not name a specialization of | |||
8726 | // a template with internal linkage. | |||
8727 | if (TSK == TSK_ExplicitInstantiationDeclaration && | |||
8728 | D->getFormalLinkage() == InternalLinkage) { | |||
8729 | S.Diag(InstLoc, diag::err_explicit_instantiation_internal_linkage) << D; | |||
8730 | return true; | |||
8731 | } | |||
8732 | ||||
8733 | // C++11 [temp.explicit]p3: [DR 275] | |||
8734 | // An explicit instantiation shall appear in an enclosing namespace of its | |||
8735 | // template. | |||
8736 | if (CheckExplicitInstantiationScope(S, D, InstLoc, WasQualifiedName)) | |||
8737 | return true; | |||
8738 | ||||
8739 | return false; | |||
8740 | } | |||
8741 | ||||
8742 | /// Determine whether the given scope specifier has a template-id in it. | |||
8743 | static bool ScopeSpecifierHasTemplateId(const CXXScopeSpec &SS) { | |||
8744 | if (!SS.isSet()) | |||
8745 | return false; | |||
8746 | ||||
8747 | // C++11 [temp.explicit]p3: | |||
8748 | // If the explicit instantiation is for a member function, a member class | |||
8749 | // or a static data member of a class template specialization, the name of | |||
8750 | // the class template specialization in the qualified-id for the member | |||
8751 | // name shall be a simple-template-id. | |||
8752 | // | |||
8753 | // C++98 has the same restriction, just worded differently. | |||
8754 | for (NestedNameSpecifier *NNS = SS.getScopeRep(); NNS; | |||
8755 | NNS = NNS->getPrefix()) | |||
8756 | if (const Type *T = NNS->getAsType()) | |||
8757 | if (isa<TemplateSpecializationType>(T)) | |||
8758 | return true; | |||
8759 | ||||
8760 | return false; | |||
8761 | } | |||
8762 | ||||
8763 | /// Make a dllexport or dllimport attr on a class template specialization take | |||
8764 | /// effect. | |||
8765 | static void dllExportImportClassTemplateSpecialization( | |||
8766 | Sema &S, ClassTemplateSpecializationDecl *Def) { | |||
8767 | auto *A = cast_or_null<InheritableAttr>(getDLLAttr(Def)); | |||
8768 | assert(A && "dllExportImportClassTemplateSpecialization called "((A && "dllExportImportClassTemplateSpecialization called " "on Def without dllexport or dllimport") ? static_cast<void > (0) : __assert_fail ("A && \"dllExportImportClassTemplateSpecialization called \" \"on Def without dllexport or dllimport\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8769, __PRETTY_FUNCTION__)) | |||
8769 | "on Def without dllexport or dllimport")((A && "dllExportImportClassTemplateSpecialization called " "on Def without dllexport or dllimport") ? static_cast<void > (0) : __assert_fail ("A && \"dllExportImportClassTemplateSpecialization called \" \"on Def without dllexport or dllimport\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8769, __PRETTY_FUNCTION__)); | |||
8770 | ||||
8771 | // We reject explicit instantiations in class scope, so there should | |||
8772 | // never be any delayed exported classes to worry about. | |||
8773 | assert(S.DelayedDllExportClasses.empty() &&((S.DelayedDllExportClasses.empty() && "delayed exports present at explicit instantiation" ) ? static_cast<void> (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"delayed exports present at explicit instantiation\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8774, __PRETTY_FUNCTION__)) | |||
8774 | "delayed exports present at explicit instantiation")((S.DelayedDllExportClasses.empty() && "delayed exports present at explicit instantiation" ) ? static_cast<void> (0) : __assert_fail ("S.DelayedDllExportClasses.empty() && \"delayed exports present at explicit instantiation\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8774, __PRETTY_FUNCTION__)); | |||
8775 | S.checkClassLevelDLLAttribute(Def); | |||
8776 | ||||
8777 | // Propagate attribute to base class templates. | |||
8778 | for (auto &B : Def->bases()) { | |||
8779 | if (auto *BT = dyn_cast_or_null<ClassTemplateSpecializationDecl>( | |||
8780 | B.getType()->getAsCXXRecordDecl())) | |||
8781 | S.propagateDLLAttrToBaseClassTemplate(Def, A, BT, B.getBeginLoc()); | |||
8782 | } | |||
8783 | ||||
8784 | S.referenceDLLExportedClassMethods(); | |||
8785 | } | |||
8786 | ||||
8787 | // Explicit instantiation of a class template specialization | |||
8788 | DeclResult Sema::ActOnExplicitInstantiation( | |||
8789 | Scope *S, SourceLocation ExternLoc, SourceLocation TemplateLoc, | |||
8790 | unsigned TagSpec, SourceLocation KWLoc, const CXXScopeSpec &SS, | |||
8791 | TemplateTy TemplateD, SourceLocation TemplateNameLoc, | |||
8792 | SourceLocation LAngleLoc, ASTTemplateArgsPtr TemplateArgsIn, | |||
8793 | SourceLocation RAngleLoc, const ParsedAttributesView &Attr) { | |||
8794 | // Find the class template we're specializing | |||
8795 | TemplateName Name = TemplateD.get(); | |||
8796 | TemplateDecl *TD = Name.getAsTemplateDecl(); | |||
8797 | // Check that the specialization uses the same tag kind as the | |||
8798 | // original template. | |||
8799 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | |||
8800 | assert(Kind != TTK_Enum &&((Kind != TTK_Enum && "Invalid enum tag in class template explicit instantiation!" ) ? static_cast<void> (0) : __assert_fail ("Kind != TTK_Enum && \"Invalid enum tag in class template explicit instantiation!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8801, __PRETTY_FUNCTION__)) | |||
8801 | "Invalid enum tag in class template explicit instantiation!")((Kind != TTK_Enum && "Invalid enum tag in class template explicit instantiation!" ) ? static_cast<void> (0) : __assert_fail ("Kind != TTK_Enum && \"Invalid enum tag in class template explicit instantiation!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 8801, __PRETTY_FUNCTION__)); | |||
8802 | ||||
8803 | ClassTemplateDecl *ClassTemplate = dyn_cast<ClassTemplateDecl>(TD); | |||
8804 | ||||
8805 | if (!ClassTemplate) { | |||
8806 | NonTagKind NTK = getNonTagTypeDeclKind(TD, Kind); | |||
8807 | Diag(TemplateNameLoc, diag::err_tag_reference_non_tag) << TD << NTK << Kind; | |||
8808 | Diag(TD->getLocation(), diag::note_previous_use); | |||
8809 | return true; | |||
8810 | } | |||
8811 | ||||
8812 | if (!isAcceptableTagRedeclaration(ClassTemplate->getTemplatedDecl(), | |||
8813 | Kind, /*isDefinition*/false, KWLoc, | |||
8814 | ClassTemplate->getIdentifier())) { | |||
8815 | Diag(KWLoc, diag::err_use_with_wrong_tag) | |||
8816 | << ClassTemplate | |||
8817 | << FixItHint::CreateReplacement(KWLoc, | |||
8818 | ClassTemplate->getTemplatedDecl()->getKindName()); | |||
8819 | Diag(ClassTemplate->getTemplatedDecl()->getLocation(), | |||
8820 | diag::note_previous_use); | |||
8821 | Kind = ClassTemplate->getTemplatedDecl()->getTagKind(); | |||
8822 | } | |||
8823 | ||||
8824 | // C++0x [temp.explicit]p2: | |||
8825 | // There are two forms of explicit instantiation: an explicit instantiation | |||
8826 | // definition and an explicit instantiation declaration. An explicit | |||
8827 | // instantiation declaration begins with the extern keyword. [...] | |||
8828 | TemplateSpecializationKind TSK = ExternLoc.isInvalid() | |||
8829 | ? TSK_ExplicitInstantiationDefinition | |||
8830 | : TSK_ExplicitInstantiationDeclaration; | |||
8831 | ||||
8832 | if (TSK == TSK_ExplicitInstantiationDeclaration && | |||
8833 | !Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { | |||
8834 | // Check for dllexport class template instantiation declarations, | |||
8835 | // except for MinGW mode. | |||
8836 | for (const ParsedAttr &AL : Attr) { | |||
8837 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { | |||
8838 | Diag(ExternLoc, | |||
8839 | diag::warn_attribute_dllexport_explicit_instantiation_decl); | |||
8840 | Diag(AL.getLoc(), diag::note_attribute); | |||
8841 | break; | |||
8842 | } | |||
8843 | } | |||
8844 | ||||
8845 | if (auto *A = ClassTemplate->getTemplatedDecl()->getAttr<DLLExportAttr>()) { | |||
8846 | Diag(ExternLoc, | |||
8847 | diag::warn_attribute_dllexport_explicit_instantiation_decl); | |||
8848 | Diag(A->getLocation(), diag::note_attribute); | |||
8849 | } | |||
8850 | } | |||
8851 | ||||
8852 | // In MSVC mode, dllimported explicit instantiation definitions are treated as | |||
8853 | // instantiation declarations for most purposes. | |||
8854 | bool DLLImportExplicitInstantiationDef = false; | |||
8855 | if (TSK == TSK_ExplicitInstantiationDefinition && | |||
8856 | Context.getTargetInfo().getCXXABI().isMicrosoft()) { | |||
8857 | // Check for dllimport class template instantiation definitions. | |||
8858 | bool DLLImport = | |||
8859 | ClassTemplate->getTemplatedDecl()->getAttr<DLLImportAttr>(); | |||
8860 | for (const ParsedAttr &AL : Attr) { | |||
8861 | if (AL.getKind() == ParsedAttr::AT_DLLImport) | |||
8862 | DLLImport = true; | |||
8863 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { | |||
8864 | // dllexport trumps dllimport here. | |||
8865 | DLLImport = false; | |||
8866 | break; | |||
8867 | } | |||
8868 | } | |||
8869 | if (DLLImport) { | |||
8870 | TSK = TSK_ExplicitInstantiationDeclaration; | |||
8871 | DLLImportExplicitInstantiationDef = true; | |||
8872 | } | |||
8873 | } | |||
8874 | ||||
8875 | // Translate the parser's template argument list in our AST format. | |||
8876 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); | |||
8877 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); | |||
8878 | ||||
8879 | // Check that the template argument list is well-formed for this | |||
8880 | // template. | |||
8881 | SmallVector<TemplateArgument, 4> Converted; | |||
8882 | if (CheckTemplateArgumentList(ClassTemplate, TemplateNameLoc, | |||
8883 | TemplateArgs, false, Converted)) | |||
8884 | return true; | |||
8885 | ||||
8886 | // Find the class template specialization declaration that | |||
8887 | // corresponds to these arguments. | |||
8888 | void *InsertPos = nullptr; | |||
8889 | ClassTemplateSpecializationDecl *PrevDecl | |||
8890 | = ClassTemplate->findSpecialization(Converted, InsertPos); | |||
8891 | ||||
8892 | TemplateSpecializationKind PrevDecl_TSK | |||
8893 | = PrevDecl ? PrevDecl->getTemplateSpecializationKind() : TSK_Undeclared; | |||
8894 | ||||
8895 | if (TSK == TSK_ExplicitInstantiationDefinition && PrevDecl != nullptr && | |||
8896 | Context.getTargetInfo().getTriple().isWindowsGNUEnvironment()) { | |||
8897 | // Check for dllexport class template instantiation definitions in MinGW | |||
8898 | // mode, if a previous declaration of the instantiation was seen. | |||
8899 | for (const ParsedAttr &AL : Attr) { | |||
8900 | if (AL.getKind() == ParsedAttr::AT_DLLExport) { | |||
8901 | Diag(AL.getLoc(), | |||
8902 | diag::warn_attribute_dllexport_explicit_instantiation_def); | |||
8903 | break; | |||
8904 | } | |||
8905 | } | |||
8906 | } | |||
8907 | ||||
8908 | if (CheckExplicitInstantiation(*this, ClassTemplate, TemplateNameLoc, | |||
8909 | SS.isSet(), TSK)) | |||
8910 | return true; | |||
8911 | ||||
8912 | ClassTemplateSpecializationDecl *Specialization = nullptr; | |||
8913 | ||||
8914 | bool HasNoEffect = false; | |||
8915 | if (PrevDecl) { | |||
8916 | if (CheckSpecializationInstantiationRedecl(TemplateNameLoc, TSK, | |||
8917 | PrevDecl, PrevDecl_TSK, | |||
8918 | PrevDecl->getPointOfInstantiation(), | |||
8919 | HasNoEffect)) | |||
8920 | return PrevDecl; | |||
8921 | ||||
8922 | // Even though HasNoEffect == true means that this explicit instantiation | |||
8923 | // has no effect on semantics, we go on to put its syntax in the AST. | |||
8924 | ||||
8925 | if (PrevDecl_TSK == TSK_ImplicitInstantiation || | |||
8926 | PrevDecl_TSK == TSK_Undeclared) { | |||
8927 | // Since the only prior class template specialization with these | |||
8928 | // arguments was referenced but not declared, reuse that | |||
8929 | // declaration node as our own, updating the source location | |||
8930 | // for the template name to reflect our new declaration. | |||
8931 | // (Other source locations will be updated later.) | |||
8932 | Specialization = PrevDecl; | |||
8933 | Specialization->setLocation(TemplateNameLoc); | |||
8934 | PrevDecl = nullptr; | |||
8935 | } | |||
8936 | ||||
8937 | if (PrevDecl_TSK == TSK_ExplicitInstantiationDeclaration && | |||
8938 | DLLImportExplicitInstantiationDef) { | |||
8939 | // The new specialization might add a dllimport attribute. | |||
8940 | HasNoEffect = false; | |||
8941 | } | |||
8942 | } | |||
8943 | ||||
8944 | if (!Specialization) { | |||
8945 | // Create a new class template specialization declaration node for | |||
8946 | // this explicit specialization. | |||
8947 | Specialization | |||
8948 | = ClassTemplateSpecializationDecl::Create(Context, Kind, | |||
8949 | ClassTemplate->getDeclContext(), | |||
8950 | KWLoc, TemplateNameLoc, | |||
8951 | ClassTemplate, | |||
8952 | Converted, | |||
8953 | PrevDecl); | |||
8954 | SetNestedNameSpecifier(*this, Specialization, SS); | |||
8955 | ||||
8956 | if (!HasNoEffect && !PrevDecl) { | |||
8957 | // Insert the new specialization. | |||
8958 | ClassTemplate->AddSpecialization(Specialization, InsertPos); | |||
8959 | } | |||
8960 | } | |||
8961 | ||||
8962 | // Build the fully-sugared type for this explicit instantiation as | |||
8963 | // the user wrote in the explicit instantiation itself. This means | |||
8964 | // that we'll pretty-print the type retrieved from the | |||
8965 | // specialization's declaration the way that the user actually wrote | |||
8966 | // the explicit instantiation, rather than formatting the name based | |||
8967 | // on the "canonical" representation used to store the template | |||
8968 | // arguments in the specialization. | |||
8969 | TypeSourceInfo *WrittenTy | |||
8970 | = Context.getTemplateSpecializationTypeInfo(Name, TemplateNameLoc, | |||
8971 | TemplateArgs, | |||
8972 | Context.getTypeDeclType(Specialization)); | |||
8973 | Specialization->setTypeAsWritten(WrittenTy); | |||
8974 | ||||
8975 | // Set source locations for keywords. | |||
8976 | Specialization->setExternLoc(ExternLoc); | |||
8977 | Specialization->setTemplateKeywordLoc(TemplateLoc); | |||
8978 | Specialization->setBraceRange(SourceRange()); | |||
8979 | ||||
8980 | bool PreviouslyDLLExported = Specialization->hasAttr<DLLExportAttr>(); | |||
8981 | ProcessDeclAttributeList(S, Specialization, Attr); | |||
8982 | ||||
8983 | // Add the explicit instantiation into its lexical context. However, | |||
8984 | // since explicit instantiations are never found by name lookup, we | |||
8985 | // just put it into the declaration context directly. | |||
8986 | Specialization->setLexicalDeclContext(CurContext); | |||
8987 | CurContext->addDecl(Specialization); | |||
8988 | ||||
8989 | // Syntax is now OK, so return if it has no other effect on semantics. | |||
8990 | if (HasNoEffect) { | |||
8991 | // Set the template specialization kind. | |||
8992 | Specialization->setTemplateSpecializationKind(TSK); | |||
8993 | return Specialization; | |||
8994 | } | |||
8995 | ||||
8996 | // C++ [temp.explicit]p3: | |||
8997 | // A definition of a class template or class member template | |||
8998 | // shall be in scope at the point of the explicit instantiation of | |||
8999 | // the class template or class member template. | |||
9000 | // | |||
9001 | // This check comes when we actually try to perform the | |||
9002 | // instantiation. | |||
9003 | ClassTemplateSpecializationDecl *Def | |||
9004 | = cast_or_null<ClassTemplateSpecializationDecl>( | |||
9005 | Specialization->getDefinition()); | |||
9006 | if (!Def) | |||
9007 | InstantiateClassTemplateSpecialization(TemplateNameLoc, Specialization, TSK); | |||
9008 | else if (TSK == TSK_ExplicitInstantiationDefinition) { | |||
9009 | MarkVTableUsed(TemplateNameLoc, Specialization, true); | |||
9010 | Specialization->setPointOfInstantiation(Def->getPointOfInstantiation()); | |||
9011 | } | |||
9012 | ||||
9013 | // Instantiate the members of this class template specialization. | |||
9014 | Def = cast_or_null<ClassTemplateSpecializationDecl>( | |||
9015 | Specialization->getDefinition()); | |||
9016 | if (Def) { | |||
9017 | TemplateSpecializationKind Old_TSK = Def->getTemplateSpecializationKind(); | |||
9018 | // Fix a TSK_ExplicitInstantiationDeclaration followed by a | |||
9019 | // TSK_ExplicitInstantiationDefinition | |||
9020 | if (Old_TSK == TSK_ExplicitInstantiationDeclaration && | |||
9021 | (TSK == TSK_ExplicitInstantiationDefinition || | |||
9022 | DLLImportExplicitInstantiationDef)) { | |||
9023 | // FIXME: Need to notify the ASTMutationListener that we did this. | |||
9024 | Def->setTemplateSpecializationKind(TSK); | |||
9025 | ||||
9026 | if (!getDLLAttr(Def) && getDLLAttr(Specialization) && | |||
9027 | (Context.getTargetInfo().getCXXABI().isMicrosoft() || | |||
9028 | Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment())) { | |||
9029 | // In the MS ABI, an explicit instantiation definition can add a dll | |||
9030 | // attribute to a template with a previous instantiation declaration. | |||
9031 | // MinGW doesn't allow this. | |||
9032 | auto *A = cast<InheritableAttr>( | |||
9033 | getDLLAttr(Specialization)->clone(getASTContext())); | |||
9034 | A->setInherited(true); | |||
9035 | Def->addAttr(A); | |||
9036 | dllExportImportClassTemplateSpecialization(*this, Def); | |||
9037 | } | |||
9038 | } | |||
9039 | ||||
9040 | // Fix a TSK_ImplicitInstantiation followed by a | |||
9041 | // TSK_ExplicitInstantiationDefinition | |||
9042 | bool NewlyDLLExported = | |||
9043 | !PreviouslyDLLExported && Specialization->hasAttr<DLLExportAttr>(); | |||
9044 | if (Old_TSK == TSK_ImplicitInstantiation && NewlyDLLExported && | |||
9045 | (Context.getTargetInfo().getCXXABI().isMicrosoft() || | |||
9046 | Context.getTargetInfo().getTriple().isWindowsItaniumEnvironment())) { | |||
9047 | // In the MS ABI, an explicit instantiation definition can add a dll | |||
9048 | // attribute to a template with a previous implicit instantiation. | |||
9049 | // MinGW doesn't allow this. We limit clang to only adding dllexport, to | |||
9050 | // avoid potentially strange codegen behavior. For example, if we extend | |||
9051 | // this conditional to dllimport, and we have a source file calling a | |||
9052 | // method on an implicitly instantiated template class instance and then | |||
9053 | // declaring a dllimport explicit instantiation definition for the same | |||
9054 | // template class, the codegen for the method call will not respect the | |||
9055 | // dllimport, while it will with cl. The Def will already have the DLL | |||
9056 | // attribute, since the Def and Specialization will be the same in the | |||
9057 | // case of Old_TSK == TSK_ImplicitInstantiation, and we already added the | |||
9058 | // attribute to the Specialization; we just need to make it take effect. | |||
9059 | assert(Def == Specialization &&((Def == Specialization && "Def and Specialization should match for implicit instantiation" ) ? static_cast<void> (0) : __assert_fail ("Def == Specialization && \"Def and Specialization should match for implicit instantiation\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9060, __PRETTY_FUNCTION__)) | |||
9060 | "Def and Specialization should match for implicit instantiation")((Def == Specialization && "Def and Specialization should match for implicit instantiation" ) ? static_cast<void> (0) : __assert_fail ("Def == Specialization && \"Def and Specialization should match for implicit instantiation\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9060, __PRETTY_FUNCTION__)); | |||
9061 | dllExportImportClassTemplateSpecialization(*this, Def); | |||
9062 | } | |||
9063 | ||||
9064 | // In MinGW mode, export the template instantiation if the declaration | |||
9065 | // was marked dllexport. | |||
9066 | if (PrevDecl_TSK == TSK_ExplicitInstantiationDeclaration && | |||
9067 | Context.getTargetInfo().getTriple().isWindowsGNUEnvironment() && | |||
9068 | PrevDecl->hasAttr<DLLExportAttr>()) { | |||
9069 | dllExportImportClassTemplateSpecialization(*this, Def); | |||
9070 | } | |||
9071 | ||||
9072 | // Set the template specialization kind. Make sure it is set before | |||
9073 | // instantiating the members which will trigger ASTConsumer callbacks. | |||
9074 | Specialization->setTemplateSpecializationKind(TSK); | |||
9075 | InstantiateClassTemplateSpecializationMembers(TemplateNameLoc, Def, TSK); | |||
9076 | } else { | |||
9077 | ||||
9078 | // Set the template specialization kind. | |||
9079 | Specialization->setTemplateSpecializationKind(TSK); | |||
9080 | } | |||
9081 | ||||
9082 | return Specialization; | |||
9083 | } | |||
9084 | ||||
9085 | // Explicit instantiation of a member class of a class template. | |||
9086 | DeclResult | |||
9087 | Sema::ActOnExplicitInstantiation(Scope *S, SourceLocation ExternLoc, | |||
9088 | SourceLocation TemplateLoc, unsigned TagSpec, | |||
9089 | SourceLocation KWLoc, CXXScopeSpec &SS, | |||
9090 | IdentifierInfo *Name, SourceLocation NameLoc, | |||
9091 | const ParsedAttributesView &Attr) { | |||
9092 | ||||
9093 | bool Owned = false; | |||
9094 | bool IsDependent = false; | |||
9095 | Decl *TagD = ActOnTag(S, TagSpec, Sema::TUK_Reference, | |||
9096 | KWLoc, SS, Name, NameLoc, Attr, AS_none, | |||
9097 | /*ModulePrivateLoc=*/SourceLocation(), | |||
9098 | MultiTemplateParamsArg(), Owned, IsDependent, | |||
9099 | SourceLocation(), false, TypeResult(), | |||
9100 | /*IsTypeSpecifier*/false, | |||
9101 | /*IsTemplateParamOrArg*/false); | |||
9102 | assert(!IsDependent && "explicit instantiation of dependent name not yet handled")((!IsDependent && "explicit instantiation of dependent name not yet handled" ) ? static_cast<void> (0) : __assert_fail ("!IsDependent && \"explicit instantiation of dependent name not yet handled\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9102, __PRETTY_FUNCTION__)); | |||
9103 | ||||
9104 | if (!TagD) | |||
9105 | return true; | |||
9106 | ||||
9107 | TagDecl *Tag = cast<TagDecl>(TagD); | |||
9108 | assert(!Tag->isEnum() && "shouldn't see enumerations here")((!Tag->isEnum() && "shouldn't see enumerations here" ) ? static_cast<void> (0) : __assert_fail ("!Tag->isEnum() && \"shouldn't see enumerations here\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9108, __PRETTY_FUNCTION__)); | |||
9109 | ||||
9110 | if (Tag->isInvalidDecl()) | |||
9111 | return true; | |||
9112 | ||||
9113 | CXXRecordDecl *Record = cast<CXXRecordDecl>(Tag); | |||
9114 | CXXRecordDecl *Pattern = Record->getInstantiatedFromMemberClass(); | |||
9115 | if (!Pattern) { | |||
9116 | Diag(TemplateLoc, diag::err_explicit_instantiation_nontemplate_type) | |||
9117 | << Context.getTypeDeclType(Record); | |||
9118 | Diag(Record->getLocation(), diag::note_nontemplate_decl_here); | |||
9119 | return true; | |||
9120 | } | |||
9121 | ||||
9122 | // C++0x [temp.explicit]p2: | |||
9123 | // If the explicit instantiation is for a class or member class, the | |||
9124 | // elaborated-type-specifier in the declaration shall include a | |||
9125 | // simple-template-id. | |||
9126 | // | |||
9127 | // C++98 has the same restriction, just worded differently. | |||
9128 | if (!ScopeSpecifierHasTemplateId(SS)) | |||
9129 | Diag(TemplateLoc, diag::ext_explicit_instantiation_without_qualified_id) | |||
9130 | << Record << SS.getRange(); | |||
9131 | ||||
9132 | // C++0x [temp.explicit]p2: | |||
9133 | // There are two forms of explicit instantiation: an explicit instantiation | |||
9134 | // definition and an explicit instantiation declaration. An explicit | |||
9135 | // instantiation declaration begins with the extern keyword. [...] | |||
9136 | TemplateSpecializationKind TSK | |||
9137 | = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition | |||
9138 | : TSK_ExplicitInstantiationDeclaration; | |||
9139 | ||||
9140 | CheckExplicitInstantiation(*this, Record, NameLoc, true, TSK); | |||
9141 | ||||
9142 | // Verify that it is okay to explicitly instantiate here. | |||
9143 | CXXRecordDecl *PrevDecl | |||
9144 | = cast_or_null<CXXRecordDecl>(Record->getPreviousDecl()); | |||
9145 | if (!PrevDecl && Record->getDefinition()) | |||
9146 | PrevDecl = Record; | |||
9147 | if (PrevDecl) { | |||
9148 | MemberSpecializationInfo *MSInfo = PrevDecl->getMemberSpecializationInfo(); | |||
9149 | bool HasNoEffect = false; | |||
9150 | assert(MSInfo && "No member specialization information?")((MSInfo && "No member specialization information?") ? static_cast<void> (0) : __assert_fail ("MSInfo && \"No member specialization information?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9150, __PRETTY_FUNCTION__)); | |||
9151 | if (CheckSpecializationInstantiationRedecl(TemplateLoc, TSK, | |||
9152 | PrevDecl, | |||
9153 | MSInfo->getTemplateSpecializationKind(), | |||
9154 | MSInfo->getPointOfInstantiation(), | |||
9155 | HasNoEffect)) | |||
9156 | return true; | |||
9157 | if (HasNoEffect) | |||
9158 | return TagD; | |||
9159 | } | |||
9160 | ||||
9161 | CXXRecordDecl *RecordDef | |||
9162 | = cast_or_null<CXXRecordDecl>(Record->getDefinition()); | |||
9163 | if (!RecordDef) { | |||
9164 | // C++ [temp.explicit]p3: | |||
9165 | // A definition of a member class of a class template shall be in scope | |||
9166 | // at the point of an explicit instantiation of the member class. | |||
9167 | CXXRecordDecl *Def | |||
9168 | = cast_or_null<CXXRecordDecl>(Pattern->getDefinition()); | |||
9169 | if (!Def) { | |||
9170 | Diag(TemplateLoc, diag::err_explicit_instantiation_undefined_member) | |||
9171 | << 0 << Record->getDeclName() << Record->getDeclContext(); | |||
9172 | Diag(Pattern->getLocation(), diag::note_forward_declaration) | |||
9173 | << Pattern; | |||
9174 | return true; | |||
9175 | } else { | |||
9176 | if (InstantiateClass(NameLoc, Record, Def, | |||
9177 | getTemplateInstantiationArgs(Record), | |||
9178 | TSK)) | |||
9179 | return true; | |||
9180 | ||||
9181 | RecordDef = cast_or_null<CXXRecordDecl>(Record->getDefinition()); | |||
9182 | if (!RecordDef) | |||
9183 | return true; | |||
9184 | } | |||
9185 | } | |||
9186 | ||||
9187 | // Instantiate all of the members of the class. | |||
9188 | InstantiateClassMembers(NameLoc, RecordDef, | |||
9189 | getTemplateInstantiationArgs(Record), TSK); | |||
9190 | ||||
9191 | if (TSK == TSK_ExplicitInstantiationDefinition) | |||
9192 | MarkVTableUsed(NameLoc, RecordDef, true); | |||
9193 | ||||
9194 | // FIXME: We don't have any representation for explicit instantiations of | |||
9195 | // member classes. Such a representation is not needed for compilation, but it | |||
9196 | // should be available for clients that want to see all of the declarations in | |||
9197 | // the source code. | |||
9198 | return TagD; | |||
9199 | } | |||
9200 | ||||
9201 | DeclResult Sema::ActOnExplicitInstantiation(Scope *S, | |||
9202 | SourceLocation ExternLoc, | |||
9203 | SourceLocation TemplateLoc, | |||
9204 | Declarator &D) { | |||
9205 | // Explicit instantiations always require a name. | |||
9206 | // TODO: check if/when DNInfo should replace Name. | |||
9207 | DeclarationNameInfo NameInfo = GetNameForDeclarator(D); | |||
9208 | DeclarationName Name = NameInfo.getName(); | |||
9209 | if (!Name) { | |||
| ||||
9210 | if (!D.isInvalidType()) | |||
9211 | Diag(D.getDeclSpec().getBeginLoc(), | |||
9212 | diag::err_explicit_instantiation_requires_name) | |||
9213 | << D.getDeclSpec().getSourceRange() << D.getSourceRange(); | |||
9214 | ||||
9215 | return true; | |||
9216 | } | |||
9217 | ||||
9218 | // The scope passed in may not be a decl scope. Zip up the scope tree until | |||
9219 | // we find one that is. | |||
9220 | while ((S->getFlags() & Scope::DeclScope) == 0 || | |||
9221 | (S->getFlags() & Scope::TemplateParamScope) != 0) | |||
9222 | S = S->getParent(); | |||
9223 | ||||
9224 | // Determine the type of the declaration. | |||
9225 | TypeSourceInfo *T = GetTypeForDeclarator(D, S); | |||
9226 | QualType R = T->getType(); | |||
9227 | if (R.isNull()) | |||
9228 | return true; | |||
9229 | ||||
9230 | // C++ [dcl.stc]p1: | |||
9231 | // A storage-class-specifier shall not be specified in [...] an explicit | |||
9232 | // instantiation (14.7.2) directive. | |||
9233 | if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { | |||
9234 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_of_typedef) | |||
9235 | << Name; | |||
9236 | return true; | |||
9237 | } else if (D.getDeclSpec().getStorageClassSpec() | |||
9238 | != DeclSpec::SCS_unspecified) { | |||
9239 | // Complain about then remove the storage class specifier. | |||
9240 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_storage_class) | |||
9241 | << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); | |||
9242 | ||||
9243 | D.getMutableDeclSpec().ClearStorageClassSpecs(); | |||
9244 | } | |||
9245 | ||||
9246 | // C++0x [temp.explicit]p1: | |||
9247 | // [...] An explicit instantiation of a function template shall not use the | |||
9248 | // inline or constexpr specifiers. | |||
9249 | // Presumably, this also applies to member functions of class templates as | |||
9250 | // well. | |||
9251 | if (D.getDeclSpec().isInlineSpecified()) | |||
9252 | Diag(D.getDeclSpec().getInlineSpecLoc(), | |||
9253 | getLangOpts().CPlusPlus11 ? | |||
9254 | diag::err_explicit_instantiation_inline : | |||
9255 | diag::warn_explicit_instantiation_inline_0x) | |||
9256 | << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); | |||
9257 | if (D.getDeclSpec().isConstexprSpecified() && R->isFunctionType()) | |||
9258 | // FIXME: Add a fix-it to remove the 'constexpr' and add a 'const' if one is | |||
9259 | // not already specified. | |||
9260 | Diag(D.getDeclSpec().getConstexprSpecLoc(), | |||
9261 | diag::err_explicit_instantiation_constexpr); | |||
9262 | ||||
9263 | // A deduction guide is not on the list of entities that can be explicitly | |||
9264 | // instantiated. | |||
9265 | if (Name.getNameKind() == DeclarationName::CXXDeductionGuideName) { | |||
9266 | Diag(D.getDeclSpec().getBeginLoc(), diag::err_deduction_guide_specialized) | |||
9267 | << /*explicit instantiation*/ 0; | |||
9268 | return true; | |||
9269 | } | |||
9270 | ||||
9271 | // C++0x [temp.explicit]p2: | |||
9272 | // There are two forms of explicit instantiation: an explicit instantiation | |||
9273 | // definition and an explicit instantiation declaration. An explicit | |||
9274 | // instantiation declaration begins with the extern keyword. [...] | |||
9275 | TemplateSpecializationKind TSK | |||
9276 | = ExternLoc.isInvalid()? TSK_ExplicitInstantiationDefinition | |||
9277 | : TSK_ExplicitInstantiationDeclaration; | |||
9278 | ||||
9279 | LookupResult Previous(*this, NameInfo, LookupOrdinaryName); | |||
9280 | LookupParsedName(Previous, S, &D.getCXXScopeSpec()); | |||
9281 | ||||
9282 | if (!R->isFunctionType()) { | |||
9283 | // C++ [temp.explicit]p1: | |||
9284 | // A [...] static data member of a class template can be explicitly | |||
9285 | // instantiated from the member definition associated with its class | |||
9286 | // template. | |||
9287 | // C++1y [temp.explicit]p1: | |||
9288 | // A [...] variable [...] template specialization can be explicitly | |||
9289 | // instantiated from its template. | |||
9290 | if (Previous.isAmbiguous()) | |||
9291 | return true; | |||
9292 | ||||
9293 | VarDecl *Prev = Previous.getAsSingle<VarDecl>(); | |||
9294 | VarTemplateDecl *PrevTemplate = Previous.getAsSingle<VarTemplateDecl>(); | |||
9295 | ||||
9296 | if (!PrevTemplate) { | |||
9297 | if (!Prev || !Prev->isStaticDataMember()) { | |||
9298 | // We expect to see a static data member here. | |||
9299 | Diag(D.getIdentifierLoc(), diag::err_explicit_instantiation_not_known) | |||
9300 | << Name; | |||
9301 | for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); | |||
9302 | P != PEnd; ++P) | |||
9303 | Diag((*P)->getLocation(), diag::note_explicit_instantiation_here); | |||
9304 | return true; | |||
9305 | } | |||
9306 | ||||
9307 | if (!Prev->getInstantiatedFromStaticDataMember()) { | |||
9308 | // FIXME: Check for explicit specialization? | |||
9309 | Diag(D.getIdentifierLoc(), | |||
9310 | diag::err_explicit_instantiation_data_member_not_instantiated) | |||
9311 | << Prev; | |||
9312 | Diag(Prev->getLocation(), diag::note_explicit_instantiation_here); | |||
9313 | // FIXME: Can we provide a note showing where this was declared? | |||
9314 | return true; | |||
9315 | } | |||
9316 | } else { | |||
9317 | // Explicitly instantiate a variable template. | |||
9318 | ||||
9319 | // C++1y [dcl.spec.auto]p6: | |||
9320 | // ... A program that uses auto or decltype(auto) in a context not | |||
9321 | // explicitly allowed in this section is ill-formed. | |||
9322 | // | |||
9323 | // This includes auto-typed variable template instantiations. | |||
9324 | if (R->isUndeducedType()) { | |||
9325 | Diag(T->getTypeLoc().getBeginLoc(), | |||
9326 | diag::err_auto_not_allowed_var_inst); | |||
9327 | return true; | |||
9328 | } | |||
9329 | ||||
9330 | if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId) { | |||
9331 | // C++1y [temp.explicit]p3: | |||
9332 | // If the explicit instantiation is for a variable, the unqualified-id | |||
9333 | // in the declaration shall be a template-id. | |||
9334 | Diag(D.getIdentifierLoc(), | |||
9335 | diag::err_explicit_instantiation_without_template_id) | |||
9336 | << PrevTemplate; | |||
9337 | Diag(PrevTemplate->getLocation(), | |||
9338 | diag::note_explicit_instantiation_here); | |||
9339 | return true; | |||
9340 | } | |||
9341 | ||||
9342 | // Translate the parser's template argument list into our AST format. | |||
9343 | TemplateArgumentListInfo TemplateArgs = | |||
9344 | makeTemplateArgumentListInfo(*this, *D.getName().TemplateId); | |||
9345 | ||||
9346 | DeclResult Res = CheckVarTemplateId(PrevTemplate, TemplateLoc, | |||
9347 | D.getIdentifierLoc(), TemplateArgs); | |||
9348 | if (Res.isInvalid()) | |||
9349 | return true; | |||
9350 | ||||
9351 | // Ignore access control bits, we don't need them for redeclaration | |||
9352 | // checking. | |||
9353 | Prev = cast<VarDecl>(Res.get()); | |||
9354 | } | |||
9355 | ||||
9356 | // C++0x [temp.explicit]p2: | |||
9357 | // If the explicit instantiation is for a member function, a member class | |||
9358 | // or a static data member of a class template specialization, the name of | |||
9359 | // the class template specialization in the qualified-id for the member | |||
9360 | // name shall be a simple-template-id. | |||
9361 | // | |||
9362 | // C++98 has the same restriction, just worded differently. | |||
9363 | // | |||
9364 | // This does not apply to variable template specializations, where the | |||
9365 | // template-id is in the unqualified-id instead. | |||
9366 | if (!ScopeSpecifierHasTemplateId(D.getCXXScopeSpec()) && !PrevTemplate) | |||
9367 | Diag(D.getIdentifierLoc(), | |||
9368 | diag::ext_explicit_instantiation_without_qualified_id) | |||
9369 | << Prev << D.getCXXScopeSpec().getRange(); | |||
9370 | ||||
9371 | CheckExplicitInstantiation(*this, Prev, D.getIdentifierLoc(), true, TSK); | |||
9372 | ||||
9373 | // Verify that it is okay to explicitly instantiate here. | |||
9374 | TemplateSpecializationKind PrevTSK = Prev->getTemplateSpecializationKind(); | |||
9375 | SourceLocation POI = Prev->getPointOfInstantiation(); | |||
9376 | bool HasNoEffect = false; | |||
9377 | if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, Prev, | |||
9378 | PrevTSK, POI, HasNoEffect)) | |||
9379 | return true; | |||
9380 | ||||
9381 | if (!HasNoEffect) { | |||
9382 | // Instantiate static data member or variable template. | |||
9383 | Prev->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); | |||
9384 | // Merge attributes. | |||
9385 | ProcessDeclAttributeList(S, Prev, D.getDeclSpec().getAttributes()); | |||
9386 | if (TSK == TSK_ExplicitInstantiationDefinition) | |||
9387 | InstantiateVariableDefinition(D.getIdentifierLoc(), Prev); | |||
9388 | } | |||
9389 | ||||
9390 | // Check the new variable specialization against the parsed input. | |||
9391 | if (PrevTemplate && Prev && !Context.hasSameType(Prev->getType(), R)) { | |||
9392 | Diag(T->getTypeLoc().getBeginLoc(), | |||
9393 | diag::err_invalid_var_template_spec_type) | |||
9394 | << 0 << PrevTemplate << R << Prev->getType(); | |||
9395 | Diag(PrevTemplate->getLocation(), diag::note_template_declared_here) | |||
9396 | << 2 << PrevTemplate->getDeclName(); | |||
9397 | return true; | |||
9398 | } | |||
9399 | ||||
9400 | // FIXME: Create an ExplicitInstantiation node? | |||
9401 | return (Decl*) nullptr; | |||
9402 | } | |||
9403 | ||||
9404 | // If the declarator is a template-id, translate the parser's template | |||
9405 | // argument list into our AST format. | |||
9406 | bool HasExplicitTemplateArgs = false; | |||
9407 | TemplateArgumentListInfo TemplateArgs; | |||
9408 | if (D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId) { | |||
9409 | TemplateArgs = makeTemplateArgumentListInfo(*this, *D.getName().TemplateId); | |||
9410 | HasExplicitTemplateArgs = true; | |||
9411 | } | |||
9412 | ||||
9413 | // C++ [temp.explicit]p1: | |||
9414 | // A [...] function [...] can be explicitly instantiated from its template. | |||
9415 | // A member function [...] of a class template can be explicitly | |||
9416 | // instantiated from the member definition associated with its class | |||
9417 | // template. | |||
9418 | UnresolvedSet<8> TemplateMatches; | |||
9419 | FunctionDecl *NonTemplateMatch = nullptr; | |||
9420 | TemplateSpecCandidateSet FailedCandidates(D.getIdentifierLoc()); | |||
9421 | for (LookupResult::iterator P = Previous.begin(), PEnd = Previous.end(); | |||
9422 | P != PEnd; ++P) { | |||
9423 | NamedDecl *Prev = *P; | |||
9424 | if (!HasExplicitTemplateArgs) { | |||
9425 | if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(Prev)) { | |||
9426 | QualType Adjusted = adjustCCAndNoReturn(R, Method->getType(), | |||
9427 | /*AdjustExceptionSpec*/true); | |||
9428 | if (Context.hasSameUnqualifiedType(Method->getType(), Adjusted)) { | |||
9429 | if (Method->getPrimaryTemplate()) { | |||
9430 | TemplateMatches.addDecl(Method, P.getAccess()); | |||
9431 | } else { | |||
9432 | // FIXME: Can this assert ever happen? Needs a test. | |||
9433 | assert(!NonTemplateMatch && "Multiple NonTemplateMatches")((!NonTemplateMatch && "Multiple NonTemplateMatches") ? static_cast<void> (0) : __assert_fail ("!NonTemplateMatch && \"Multiple NonTemplateMatches\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9433, __PRETTY_FUNCTION__)); | |||
9434 | NonTemplateMatch = Method; | |||
9435 | } | |||
9436 | } | |||
9437 | } | |||
9438 | } | |||
9439 | ||||
9440 | FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(Prev); | |||
9441 | if (!FunTmpl) | |||
9442 | continue; | |||
9443 | ||||
9444 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); | |||
9445 | FunctionDecl *Specialization = nullptr; | |||
9446 | if (TemplateDeductionResult TDK | |||
9447 | = DeduceTemplateArguments(FunTmpl, | |||
9448 | (HasExplicitTemplateArgs ? &TemplateArgs | |||
9449 | : nullptr), | |||
9450 | R, Specialization, Info)) { | |||
9451 | // Keep track of almost-matches. | |||
9452 | FailedCandidates.addCandidate() | |||
9453 | .set(P.getPair(), FunTmpl->getTemplatedDecl(), | |||
9454 | MakeDeductionFailureInfo(Context, TDK, Info)); | |||
9455 | (void)TDK; | |||
9456 | continue; | |||
9457 | } | |||
9458 | ||||
9459 | // Target attributes are part of the cuda function signature, so | |||
9460 | // the cuda target of the instantiated function must match that of its | |||
9461 | // template. Given that C++ template deduction does not take | |||
9462 | // target attributes into account, we reject candidates here that | |||
9463 | // have a different target. | |||
9464 | if (LangOpts.CUDA && | |||
9465 | IdentifyCUDATarget(Specialization, | |||
9466 | /* IgnoreImplicitHDAttributes = */ true) != | |||
9467 | IdentifyCUDATarget(D.getDeclSpec().getAttributes())) { | |||
9468 | FailedCandidates.addCandidate().set( | |||
9469 | P.getPair(), FunTmpl->getTemplatedDecl(), | |||
9470 | MakeDeductionFailureInfo(Context, TDK_CUDATargetMismatch, Info)); | |||
9471 | continue; | |||
9472 | } | |||
9473 | ||||
9474 | TemplateMatches.addDecl(Specialization, P.getAccess()); | |||
9475 | } | |||
9476 | ||||
9477 | FunctionDecl *Specialization = NonTemplateMatch; | |||
9478 | if (!Specialization) { | |||
9479 | // Find the most specialized function template specialization. | |||
9480 | UnresolvedSetIterator Result = getMostSpecialized( | |||
9481 | TemplateMatches.begin(), TemplateMatches.end(), FailedCandidates, | |||
9482 | D.getIdentifierLoc(), | |||
9483 | PDiag(diag::err_explicit_instantiation_not_known) << Name, | |||
9484 | PDiag(diag::err_explicit_instantiation_ambiguous) << Name, | |||
9485 | PDiag(diag::note_explicit_instantiation_candidate)); | |||
9486 | ||||
9487 | if (Result == TemplateMatches.end()) | |||
9488 | return true; | |||
9489 | ||||
9490 | // Ignore access control bits, we don't need them for redeclaration checking. | |||
9491 | Specialization = cast<FunctionDecl>(*Result); | |||
9492 | } | |||
9493 | ||||
9494 | // C++11 [except.spec]p4 | |||
9495 | // In an explicit instantiation an exception-specification may be specified, | |||
9496 | // but is not required. | |||
9497 | // If an exception-specification is specified in an explicit instantiation | |||
9498 | // directive, it shall be compatible with the exception-specifications of | |||
9499 | // other declarations of that function. | |||
9500 | if (auto *FPT = R->getAs<FunctionProtoType>()) | |||
9501 | if (FPT->hasExceptionSpec()) { | |||
9502 | unsigned DiagID = | |||
9503 | diag::err_mismatched_exception_spec_explicit_instantiation; | |||
9504 | if (getLangOpts().MicrosoftExt) | |||
9505 | DiagID = diag::ext_mismatched_exception_spec_explicit_instantiation; | |||
9506 | bool Result = CheckEquivalentExceptionSpec( | |||
9507 | PDiag(DiagID) << Specialization->getType(), | |||
9508 | PDiag(diag::note_explicit_instantiation_here), | |||
9509 | Specialization->getType()->getAs<FunctionProtoType>(), | |||
9510 | Specialization->getLocation(), FPT, D.getBeginLoc()); | |||
9511 | // In Microsoft mode, mismatching exception specifications just cause a | |||
9512 | // warning. | |||
9513 | if (!getLangOpts().MicrosoftExt && Result) | |||
9514 | return true; | |||
9515 | } | |||
9516 | ||||
9517 | if (Specialization->getTemplateSpecializationKind() == TSK_Undeclared) { | |||
9518 | Diag(D.getIdentifierLoc(), | |||
9519 | diag::err_explicit_instantiation_member_function_not_instantiated) | |||
9520 | << Specialization | |||
9521 | << (Specialization->getTemplateSpecializationKind() == | |||
9522 | TSK_ExplicitSpecialization); | |||
9523 | Diag(Specialization->getLocation(), diag::note_explicit_instantiation_here); | |||
9524 | return true; | |||
9525 | } | |||
9526 | ||||
9527 | FunctionDecl *PrevDecl = Specialization->getPreviousDecl(); | |||
9528 | if (!PrevDecl && Specialization->isThisDeclarationADefinition()) | |||
9529 | PrevDecl = Specialization; | |||
9530 | ||||
9531 | if (PrevDecl) { | |||
9532 | bool HasNoEffect = false; | |||
9533 | if (CheckSpecializationInstantiationRedecl(D.getIdentifierLoc(), TSK, | |||
9534 | PrevDecl, | |||
9535 | PrevDecl->getTemplateSpecializationKind(), | |||
9536 | PrevDecl->getPointOfInstantiation(), | |||
9537 | HasNoEffect)) | |||
9538 | return true; | |||
9539 | ||||
9540 | // FIXME: We may still want to build some representation of this | |||
9541 | // explicit specialization. | |||
9542 | if (HasNoEffect) | |||
9543 | return (Decl*) nullptr; | |||
9544 | } | |||
9545 | ||||
9546 | // HACK: libc++ has a bug where it attempts to explicitly instantiate the | |||
9547 | // functions | |||
9548 | // valarray<size_t>::valarray(size_t) and | |||
9549 | // valarray<size_t>::~valarray() | |||
9550 | // that it declared to have internal linkage with the internal_linkage | |||
9551 | // attribute. Ignore the explicit instantiation declaration in this case. | |||
9552 | if (Specialization->hasAttr<InternalLinkageAttr>() && | |||
9553 | TSK == TSK_ExplicitInstantiationDeclaration) { | |||
9554 | if (auto *RD = dyn_cast<CXXRecordDecl>(Specialization->getDeclContext())) | |||
9555 | if (RD->getIdentifier() && RD->getIdentifier()->isStr("valarray") && | |||
9556 | RD->isInStdNamespace()) | |||
9557 | return (Decl*) nullptr; | |||
9558 | } | |||
9559 | ||||
9560 | ProcessDeclAttributeList(S, Specialization, D.getDeclSpec().getAttributes()); | |||
9561 | ||||
9562 | // In MSVC mode, dllimported explicit instantiation definitions are treated as | |||
9563 | // instantiation declarations. | |||
9564 | if (TSK == TSK_ExplicitInstantiationDefinition && | |||
9565 | Specialization->hasAttr<DLLImportAttr>() && | |||
9566 | Context.getTargetInfo().getCXXABI().isMicrosoft()) | |||
9567 | TSK = TSK_ExplicitInstantiationDeclaration; | |||
9568 | ||||
9569 | Specialization->setTemplateSpecializationKind(TSK, D.getIdentifierLoc()); | |||
9570 | ||||
9571 | if (Specialization->isDefined()) { | |||
9572 | // Let the ASTConsumer know that this function has been explicitly | |||
9573 | // instantiated now, and its linkage might have changed. | |||
9574 | Consumer.HandleTopLevelDecl(DeclGroupRef(Specialization)); | |||
9575 | } else if (TSK == TSK_ExplicitInstantiationDefinition) | |||
9576 | InstantiateFunctionDefinition(D.getIdentifierLoc(), Specialization); | |||
9577 | ||||
9578 | // C++0x [temp.explicit]p2: | |||
9579 | // If the explicit instantiation is for a member function, a member class | |||
9580 | // or a static data member of a class template specialization, the name of | |||
9581 | // the class template specialization in the qualified-id for the member | |||
9582 | // name shall be a simple-template-id. | |||
9583 | // | |||
9584 | // C++98 has the same restriction, just worded differently. | |||
9585 | FunctionTemplateDecl *FunTmpl = Specialization->getPrimaryTemplate(); | |||
9586 | if (D.getName().getKind() != UnqualifiedIdKind::IK_TemplateId && !FunTmpl && | |||
9587 | D.getCXXScopeSpec().isSet() && | |||
9588 | !ScopeSpecifierHasTemplateId(D.getCXXScopeSpec())) | |||
9589 | Diag(D.getIdentifierLoc(), | |||
9590 | diag::ext_explicit_instantiation_without_qualified_id) | |||
9591 | << Specialization << D.getCXXScopeSpec().getRange(); | |||
9592 | ||||
9593 | CheckExplicitInstantiation( | |||
9594 | *this, | |||
9595 | FunTmpl ? (NamedDecl *)FunTmpl | |||
9596 | : Specialization->getInstantiatedFromMemberFunction(), | |||
9597 | D.getIdentifierLoc(), D.getCXXScopeSpec().isSet(), TSK); | |||
9598 | ||||
9599 | // FIXME: Create some kind of ExplicitInstantiationDecl here. | |||
9600 | return (Decl*) nullptr; | |||
9601 | } | |||
9602 | ||||
9603 | TypeResult | |||
9604 | Sema::ActOnDependentTag(Scope *S, unsigned TagSpec, TagUseKind TUK, | |||
9605 | const CXXScopeSpec &SS, IdentifierInfo *Name, | |||
9606 | SourceLocation TagLoc, SourceLocation NameLoc) { | |||
9607 | // This has to hold, because SS is expected to be defined. | |||
9608 | assert(Name && "Expected a name in a dependent tag")((Name && "Expected a name in a dependent tag") ? static_cast <void> (0) : __assert_fail ("Name && \"Expected a name in a dependent tag\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9608, __PRETTY_FUNCTION__)); | |||
9609 | ||||
9610 | NestedNameSpecifier *NNS = SS.getScopeRep(); | |||
9611 | if (!NNS) | |||
9612 | return true; | |||
9613 | ||||
9614 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); | |||
9615 | ||||
9616 | if (TUK == TUK_Declaration || TUK == TUK_Definition) { | |||
9617 | Diag(NameLoc, diag::err_dependent_tag_decl) | |||
9618 | << (TUK == TUK_Definition) << Kind << SS.getRange(); | |||
9619 | return true; | |||
9620 | } | |||
9621 | ||||
9622 | // Create the resulting type. | |||
9623 | ElaboratedTypeKeyword Kwd = TypeWithKeyword::getKeywordForTagTypeKind(Kind); | |||
9624 | QualType Result = Context.getDependentNameType(Kwd, NNS, Name); | |||
9625 | ||||
9626 | // Create type-source location information for this type. | |||
9627 | TypeLocBuilder TLB; | |||
9628 | DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(Result); | |||
9629 | TL.setElaboratedKeywordLoc(TagLoc); | |||
9630 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
9631 | TL.setNameLoc(NameLoc); | |||
9632 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); | |||
9633 | } | |||
9634 | ||||
9635 | TypeResult | |||
9636 | Sema::ActOnTypenameType(Scope *S, SourceLocation TypenameLoc, | |||
9637 | const CXXScopeSpec &SS, const IdentifierInfo &II, | |||
9638 | SourceLocation IdLoc) { | |||
9639 | if (SS.isInvalid()) | |||
9640 | return true; | |||
9641 | ||||
9642 | if (TypenameLoc.isValid() && S && !S->getTemplateParamParent()) | |||
9643 | Diag(TypenameLoc, | |||
9644 | getLangOpts().CPlusPlus11 ? | |||
9645 | diag::warn_cxx98_compat_typename_outside_of_template : | |||
9646 | diag::ext_typename_outside_of_template) | |||
9647 | << FixItHint::CreateRemoval(TypenameLoc); | |||
9648 | ||||
9649 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); | |||
9650 | QualType T = CheckTypenameType(TypenameLoc.isValid()? ETK_Typename : ETK_None, | |||
9651 | TypenameLoc, QualifierLoc, II, IdLoc); | |||
9652 | if (T.isNull()) | |||
9653 | return true; | |||
9654 | ||||
9655 | TypeSourceInfo *TSI = Context.CreateTypeSourceInfo(T); | |||
9656 | if (isa<DependentNameType>(T)) { | |||
9657 | DependentNameTypeLoc TL = TSI->getTypeLoc().castAs<DependentNameTypeLoc>(); | |||
9658 | TL.setElaboratedKeywordLoc(TypenameLoc); | |||
9659 | TL.setQualifierLoc(QualifierLoc); | |||
9660 | TL.setNameLoc(IdLoc); | |||
9661 | } else { | |||
9662 | ElaboratedTypeLoc TL = TSI->getTypeLoc().castAs<ElaboratedTypeLoc>(); | |||
9663 | TL.setElaboratedKeywordLoc(TypenameLoc); | |||
9664 | TL.setQualifierLoc(QualifierLoc); | |||
9665 | TL.getNamedTypeLoc().castAs<TypeSpecTypeLoc>().setNameLoc(IdLoc); | |||
9666 | } | |||
9667 | ||||
9668 | return CreateParsedType(T, TSI); | |||
9669 | } | |||
9670 | ||||
9671 | TypeResult | |||
9672 | Sema::ActOnTypenameType(Scope *S, | |||
9673 | SourceLocation TypenameLoc, | |||
9674 | const CXXScopeSpec &SS, | |||
9675 | SourceLocation TemplateKWLoc, | |||
9676 | TemplateTy TemplateIn, | |||
9677 | IdentifierInfo *TemplateII, | |||
9678 | SourceLocation TemplateIILoc, | |||
9679 | SourceLocation LAngleLoc, | |||
9680 | ASTTemplateArgsPtr TemplateArgsIn, | |||
9681 | SourceLocation RAngleLoc) { | |||
9682 | if (TypenameLoc.isValid() && S && !S->getTemplateParamParent()) | |||
9683 | Diag(TypenameLoc, | |||
9684 | getLangOpts().CPlusPlus11 ? | |||
9685 | diag::warn_cxx98_compat_typename_outside_of_template : | |||
9686 | diag::ext_typename_outside_of_template) | |||
9687 | << FixItHint::CreateRemoval(TypenameLoc); | |||
9688 | ||||
9689 | // Strangely, non-type results are not ignored by this lookup, so the | |||
9690 | // program is ill-formed if it finds an injected-class-name. | |||
9691 | if (TypenameLoc.isValid()) { | |||
9692 | auto *LookupRD = | |||
9693 | dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, false)); | |||
9694 | if (LookupRD && LookupRD->getIdentifier() == TemplateII) { | |||
9695 | Diag(TemplateIILoc, | |||
9696 | diag::ext_out_of_line_qualified_id_type_names_constructor) | |||
9697 | << TemplateII << 0 /*injected-class-name used as template name*/ | |||
9698 | << (TemplateKWLoc.isValid() ? 1 : 0 /*'template'/'typename' keyword*/); | |||
9699 | } | |||
9700 | } | |||
9701 | ||||
9702 | // Translate the parser's template argument list in our AST format. | |||
9703 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); | |||
9704 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); | |||
9705 | ||||
9706 | TemplateName Template = TemplateIn.get(); | |||
9707 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { | |||
9708 | // Construct a dependent template specialization type. | |||
9709 | assert(DTN && "dependent template has non-dependent name?")((DTN && "dependent template has non-dependent name?" ) ? static_cast<void> (0) : __assert_fail ("DTN && \"dependent template has non-dependent name?\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9709, __PRETTY_FUNCTION__)); | |||
9710 | assert(DTN->getQualifier() == SS.getScopeRep())((DTN->getQualifier() == SS.getScopeRep()) ? static_cast< void> (0) : __assert_fail ("DTN->getQualifier() == SS.getScopeRep()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9710, __PRETTY_FUNCTION__)); | |||
9711 | QualType T = Context.getDependentTemplateSpecializationType(ETK_Typename, | |||
9712 | DTN->getQualifier(), | |||
9713 | DTN->getIdentifier(), | |||
9714 | TemplateArgs); | |||
9715 | ||||
9716 | // Create source-location information for this type. | |||
9717 | TypeLocBuilder Builder; | |||
9718 | DependentTemplateSpecializationTypeLoc SpecTL | |||
9719 | = Builder.push<DependentTemplateSpecializationTypeLoc>(T); | |||
9720 | SpecTL.setElaboratedKeywordLoc(TypenameLoc); | |||
9721 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
9722 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); | |||
9723 | SpecTL.setTemplateNameLoc(TemplateIILoc); | |||
9724 | SpecTL.setLAngleLoc(LAngleLoc); | |||
9725 | SpecTL.setRAngleLoc(RAngleLoc); | |||
9726 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) | |||
9727 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); | |||
9728 | return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); | |||
9729 | } | |||
9730 | ||||
9731 | QualType T = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs); | |||
9732 | if (T.isNull()) | |||
9733 | return true; | |||
9734 | ||||
9735 | // Provide source-location information for the template specialization type. | |||
9736 | TypeLocBuilder Builder; | |||
9737 | TemplateSpecializationTypeLoc SpecTL | |||
9738 | = Builder.push<TemplateSpecializationTypeLoc>(T); | |||
9739 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); | |||
9740 | SpecTL.setTemplateNameLoc(TemplateIILoc); | |||
9741 | SpecTL.setLAngleLoc(LAngleLoc); | |||
9742 | SpecTL.setRAngleLoc(RAngleLoc); | |||
9743 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) | |||
9744 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); | |||
9745 | ||||
9746 | T = Context.getElaboratedType(ETK_Typename, SS.getScopeRep(), T); | |||
9747 | ElaboratedTypeLoc TL = Builder.push<ElaboratedTypeLoc>(T); | |||
9748 | TL.setElaboratedKeywordLoc(TypenameLoc); | |||
9749 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); | |||
9750 | ||||
9751 | TypeSourceInfo *TSI = Builder.getTypeSourceInfo(Context, T); | |||
9752 | return CreateParsedType(T, TSI); | |||
9753 | } | |||
9754 | ||||
9755 | ||||
9756 | /// Determine whether this failed name lookup should be treated as being | |||
9757 | /// disabled by a usage of std::enable_if. | |||
9758 | static bool isEnableIf(NestedNameSpecifierLoc NNS, const IdentifierInfo &II, | |||
9759 | SourceRange &CondRange, Expr *&Cond) { | |||
9760 | // We must be looking for a ::type... | |||
9761 | if (!II.isStr("type")) | |||
9762 | return false; | |||
9763 | ||||
9764 | // ... within an explicitly-written template specialization... | |||
9765 | if (!NNS || !NNS.getNestedNameSpecifier()->getAsType()) | |||
9766 | return false; | |||
9767 | TypeLoc EnableIfTy = NNS.getTypeLoc(); | |||
9768 | TemplateSpecializationTypeLoc EnableIfTSTLoc = | |||
9769 | EnableIfTy.getAs<TemplateSpecializationTypeLoc>(); | |||
9770 | if (!EnableIfTSTLoc || EnableIfTSTLoc.getNumArgs() == 0) | |||
9771 | return false; | |||
9772 | const TemplateSpecializationType *EnableIfTST = EnableIfTSTLoc.getTypePtr(); | |||
9773 | ||||
9774 | // ... which names a complete class template declaration... | |||
9775 | const TemplateDecl *EnableIfDecl = | |||
9776 | EnableIfTST->getTemplateName().getAsTemplateDecl(); | |||
9777 | if (!EnableIfDecl || EnableIfTST->isIncompleteType()) | |||
9778 | return false; | |||
9779 | ||||
9780 | // ... called "enable_if". | |||
9781 | const IdentifierInfo *EnableIfII = | |||
9782 | EnableIfDecl->getDeclName().getAsIdentifierInfo(); | |||
9783 | if (!EnableIfII || !EnableIfII->isStr("enable_if")) | |||
9784 | return false; | |||
9785 | ||||
9786 | // Assume the first template argument is the condition. | |||
9787 | CondRange = EnableIfTSTLoc.getArgLoc(0).getSourceRange(); | |||
9788 | ||||
9789 | // Dig out the condition. | |||
9790 | Cond = nullptr; | |||
9791 | if (EnableIfTSTLoc.getArgLoc(0).getArgument().getKind() | |||
9792 | != TemplateArgument::Expression) | |||
9793 | return true; | |||
9794 | ||||
9795 | Cond = EnableIfTSTLoc.getArgLoc(0).getSourceExpression(); | |||
9796 | ||||
9797 | // Ignore Boolean literals; they add no value. | |||
9798 | if (isa<CXXBoolLiteralExpr>(Cond->IgnoreParenCasts())) | |||
9799 | Cond = nullptr; | |||
9800 | ||||
9801 | return true; | |||
9802 | } | |||
9803 | ||||
9804 | /// Build the type that describes a C++ typename specifier, | |||
9805 | /// e.g., "typename T::type". | |||
9806 | QualType | |||
9807 | Sema::CheckTypenameType(ElaboratedTypeKeyword Keyword, | |||
9808 | SourceLocation KeywordLoc, | |||
9809 | NestedNameSpecifierLoc QualifierLoc, | |||
9810 | const IdentifierInfo &II, | |||
9811 | SourceLocation IILoc) { | |||
9812 | CXXScopeSpec SS; | |||
9813 | SS.Adopt(QualifierLoc); | |||
9814 | ||||
9815 | DeclContext *Ctx = computeDeclContext(SS); | |||
9816 | if (!Ctx) { | |||
9817 | // If the nested-name-specifier is dependent and couldn't be | |||
9818 | // resolved to a type, build a typename type. | |||
9819 | assert(QualifierLoc.getNestedNameSpecifier()->isDependent())((QualifierLoc.getNestedNameSpecifier()->isDependent()) ? static_cast <void> (0) : __assert_fail ("QualifierLoc.getNestedNameSpecifier()->isDependent()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/lib/Sema/SemaTemplate.cpp" , 9819, __PRETTY_FUNCTION__)); | |||
9820 | return Context.getDependentNameType(Keyword, | |||
9821 | QualifierLoc.getNestedNameSpecifier(), | |||
9822 | &II); | |||
9823 | } | |||
9824 | ||||
9825 | // If the nested-name-specifier refers to the current instantiation, | |||
9826 | // the "typename" keyword itself is superfluous. In C++03, the | |||
9827 | // program is actually ill-formed. However, DR 382 (in C++0x CD1) | |||
9828 | // allows such extraneous "typename" keywords, and we retroactively | |||
9829 | // apply this DR to C++03 code with only a warning. In any case we continue. | |||
9830 | ||||
9831 | if (RequireCompleteDeclContext(SS, Ctx)) | |||
9832 | return QualType(); | |||
9833 | ||||
9834 | DeclarationName Name(&II); | |||
9835 | LookupResult Result(*this, Name, IILoc, LookupOrdinaryName); | |||
9836 | LookupQualifiedName(Result, Ctx, SS); | |||
9837 | unsigned DiagID = 0; | |||
9838 | Decl *Referenced = nullptr; | |||
9839 | switch (Result.getResultKind()) { | |||
9840 | case LookupResult::NotFound: { | |||
9841 | // If we're looking up 'type' within a template named 'enable_if', produce | |||
9842 | // a more specific diagnostic. | |||
9843 | SourceRange CondRange; | |||
9844 | Expr *Cond = nullptr; | |||
9845 | if (isEnableIf(QualifierLoc, II, CondRange, Cond)) { | |||
9846 | // If we have a condition, narrow it down to the specific failed | |||
9847 | // condition. | |||
9848 | if (Cond) { | |||
9849 | Expr *FailedCond; | |||
9850 | std::string FailedDescription; | |||
9851 | std::tie(FailedCond, FailedDescription) = | |||
9852 | findFailedBooleanCondition(Cond); | |||
9853 | ||||
9854 | Diag(FailedCond->getExprLoc(), | |||
9855 | diag::err_typename_nested_not_found_requirement) | |||
9856 | << FailedDescription | |||
9857 | << FailedCond->getSourceRange(); | |||
9858 | return QualType(); | |||
9859 | } | |||
9860 | ||||
9861 | Diag(CondRange.getBegin(), diag::err_typename_nested_not_found_enable_if) | |||
9862 | << Ctx << CondRange; | |||
9863 | return QualType(); | |||
9864 | } | |||
9865 | ||||
9866 | DiagID = diag::err_typename_nested_not_found; | |||
9867 | break; | |||
9868 | } | |||
9869 | ||||
9870 | case LookupResult::FoundUnresolvedValue: { | |||
9871 | // We found a using declaration that is a value. Most likely, the using | |||
9872 | // declaration itself is meant to have the 'typename' keyword. | |||
9873 | SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), | |||
9874 | IILoc); | |||
9875 | Diag(IILoc, diag::err_typename_refers_to_using_value_decl) | |||
9876 | << Name << Ctx << FullRange; | |||
9877 | if (UnresolvedUsingValueDecl *Using | |||
9878 | = dyn_cast<UnresolvedUsingValueDecl>(Result.getRepresentativeDecl())){ | |||
9879 | SourceLocation Loc = Using->getQualifierLoc().getBeginLoc(); | |||
9880 | Diag(Loc, diag::note_using_value_decl_missing_typename) | |||
9881 | << FixItHint::CreateInsertion(Loc, "typename "); | |||
9882 | } | |||
9883 | } | |||
9884 | // Fall through to create a dependent typename type, from which we can recover | |||
9885 | // better. | |||
9886 | LLVM_FALLTHROUGH[[clang::fallthrough]]; | |||
9887 | ||||
9888 | case LookupResult::NotFoundInCurrentInstantiation: | |||
9889 | // Okay, it's a member of an unknown instantiation. | |||
9890 | return Context.getDependentNameType(Keyword, | |||
9891 | QualifierLoc.getNestedNameSpecifier(), | |||
9892 | &II); | |||
9893 | ||||
9894 | case LookupResult::Found: | |||
9895 | if (TypeDecl *Type = dyn_cast<TypeDecl>(Result.getFoundDecl())) { | |||
9896 | // C++ [class.qual]p2: | |||
9897 | // In a lookup in which function names are not ignored and the | |||
9898 | // nested-name-specifier nominates a class C, if the name specified | |||
9899 | // after the nested-name-specifier, when looked up in C, is the | |||
9900 | // injected-class-name of C [...] then the name is instead considered | |||
9901 | // to name the constructor of class C. | |||
9902 | // | |||
9903 | // Unlike in an elaborated-type-specifier, function names are not ignored | |||
9904 | // in typename-specifier lookup. However, they are ignored in all the | |||
9905 | // contexts where we form a typename type with no keyword (that is, in | |||
9906 | // mem-initializer-ids, base-specifiers, and elaborated-type-specifiers). | |||
9907 | // | |||
9908 | // FIXME: That's not strictly true: mem-initializer-id lookup does not | |||
9909 | // ignore functions, but that appears to be an oversight. | |||
9910 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(Ctx); | |||
9911 | auto *FoundRD = dyn_cast<CXXRecordDecl>(Type); | |||
9912 | if (Keyword == ETK_Typename && LookupRD && FoundRD && | |||
9913 | FoundRD->isInjectedClassName() && | |||
9914 | declaresSameEntity(LookupRD, cast<Decl>(FoundRD->getParent()))) | |||
9915 | Diag(IILoc, diag::ext_out_of_line_qualified_id_type_names_constructor) | |||
9916 | << &II << 1 << 0 /*'typename' keyword used*/; | |||
9917 | ||||
9918 | // We found a type. Build an ElaboratedType, since the | |||
9919 | // typename-specifier was just sugar. | |||
9920 | MarkAnyDeclReferenced(Type->getLocation(), Type, /*OdrUse=*/false); | |||
9921 | return Context.getElaboratedType(Keyword, | |||
9922 | QualifierLoc.getNestedNameSpecifier(), | |||
9923 | Context.getTypeDeclType(Type)); | |||
9924 | } | |||
9925 | ||||
9926 | // C++ [dcl.type.simple]p2: | |||
9927 | // A type-specifier of the form | |||
9928 | // typename[opt] nested-name-specifier[opt] template-name | |||
9929 | // is a placeholder for a deduced class type [...]. | |||
9930 | if (getLangOpts().CPlusPlus17) { | |||
9931 | if (auto *TD = getAsTypeTemplateDecl(Result.getFoundDecl())) { | |||
9932 | return Context.getElaboratedType( | |||
9933 | Keyword, QualifierLoc.getNestedNameSpecifier(), | |||
9934 | Context.getDeducedTemplateSpecializationType(TemplateName(TD), | |||
9935 | QualType(), false)); | |||
9936 | } | |||
9937 | } | |||
9938 | ||||
9939 | DiagID = diag::err_typename_nested_not_type; | |||
9940 | Referenced = Result.getFoundDecl(); | |||
9941 | break; | |||
9942 | ||||
9943 | case LookupResult::FoundOverloaded: | |||
9944 | DiagID = diag::err_typename_nested_not_type; | |||
9945 | Referenced = *Result.begin(); | |||
9946 | break; | |||
9947 | ||||
9948 | case LookupResult::Ambiguous: | |||
9949 | return QualType(); | |||
9950 | } | |||
9951 | ||||
9952 | // If we get here, it's because name lookup did not find a | |||
9953 | // type. Emit an appropriate diagnostic and return an error. | |||
9954 | SourceRange FullRange(KeywordLoc.isValid() ? KeywordLoc : SS.getBeginLoc(), | |||
9955 | IILoc); | |||
9956 | Diag(IILoc, DiagID) << FullRange << Name << Ctx; | |||
9957 | if (Referenced) | |||
9958 | Diag(Referenced->getLocation(), diag::note_typename_refers_here) | |||
9959 | << Name; | |||
9960 | return QualType(); | |||
9961 | } | |||
9962 | ||||
9963 | namespace { | |||
9964 | // See Sema::RebuildTypeInCurrentInstantiation | |||
9965 | class CurrentInstantiationRebuilder | |||
9966 | : public TreeTransform<CurrentInstantiationRebuilder> { | |||
9967 | SourceLocation Loc; | |||
9968 | DeclarationName Entity; | |||
9969 | ||||
9970 | public: | |||
9971 | typedef TreeTransform<CurrentInstantiationRebuilder> inherited; | |||
9972 | ||||
9973 | CurrentInstantiationRebuilder(Sema &SemaRef, | |||
9974 | SourceLocation Loc, | |||
9975 | DeclarationName Entity) | |||
9976 | : TreeTransform<CurrentInstantiationRebuilder>(SemaRef), | |||
9977 | Loc(Loc), Entity(Entity) { } | |||
9978 | ||||
9979 | /// Determine whether the given type \p T has already been | |||
9980 | /// transformed. | |||
9981 | /// | |||
9982 | /// For the purposes of type reconstruction, a type has already been | |||
9983 | /// transformed if it is NULL or if it is not dependent. | |||
9984 | bool AlreadyTransformed(QualType T) { | |||
9985 | return T.isNull() || !T->isDependentType(); | |||
9986 | } | |||
9987 | ||||
9988 | /// Returns the location of the entity whose type is being | |||
9989 | /// rebuilt. | |||
9990 | SourceLocation getBaseLocation() { return Loc; } | |||
9991 | ||||
9992 | /// Returns the name of the entity whose type is being rebuilt. | |||
9993 | DeclarationName getBaseEntity() { return Entity; } | |||
9994 | ||||
9995 | /// Sets the "base" location and entity when that | |||
9996 | /// information is known based on another transformation. | |||
9997 | void setBase(SourceLocation Loc, DeclarationName Entity) { | |||
9998 | this->Loc = Loc; | |||
9999 | this->Entity = Entity; | |||
10000 | } | |||
10001 | ||||
10002 | ExprResult TransformLambdaExpr(LambdaExpr *E) { | |||
10003 | // Lambdas never need to be transformed. | |||
10004 | return E; | |||
10005 | } | |||
10006 | }; | |||
10007 | } // end anonymous namespace | |||
10008 | ||||
10009 | /// Rebuilds a type within the context of the current instantiation. | |||
10010 | /// | |||
10011 | /// The type \p T is part of the type of an out-of-line member definition of | |||
10012 | /// a class template (or class template partial specialization) that was parsed | |||
10013 | /// and constructed before we entered the scope of the class template (or | |||
10014 | /// partial specialization thereof). This routine will rebuild that type now | |||
10015 | /// that we have entered the declarator's scope, which may produce different | |||
10016 | /// canonical types, e.g., | |||
10017 | /// | |||
10018 | /// \code | |||
10019 | /// template<typename T> | |||
10020 | /// struct X { | |||
10021 | /// typedef T* pointer; | |||
10022 | /// pointer data(); | |||
10023 | /// }; | |||
10024 | /// | |||
10025 | /// template<typename T> | |||
10026 | /// typename X<T>::pointer X<T>::data() { ... } | |||
10027 | /// \endcode | |||
10028 | /// | |||
10029 | /// Here, the type "typename X<T>::pointer" will be created as a DependentNameType, | |||
10030 | /// since we do not know that we can look into X<T> when we parsed the type. | |||
10031 | /// This function will rebuild the type, performing the lookup of "pointer" | |||
10032 | /// in X<T> and returning an ElaboratedType whose canonical type is the same | |||
10033 | /// as the canonical type of T*, allowing the return types of the out-of-line | |||
10034 | /// definition and the declaration to match. | |||
10035 | TypeSourceInfo *Sema::RebuildTypeInCurrentInstantiation(TypeSourceInfo *T, | |||
10036 | SourceLocation Loc, | |||
10037 | DeclarationName Name) { | |||
10038 | if (!T || !T->getType()->isDependentType()) | |||
10039 | return T; | |||
10040 | ||||
10041 | CurrentInstantiationRebuilder Rebuilder(*this, Loc, Name); | |||
10042 | return Rebuilder.TransformType(T); | |||
10043 | } | |||
10044 | ||||
10045 | ExprResult Sema::RebuildExprInCurrentInstantiation(Expr *E) { | |||
10046 | CurrentInstantiationRebuilder Rebuilder(*this, E->getExprLoc(), | |||
10047 | DeclarationName()); | |||
10048 | return Rebuilder.TransformExpr(E); | |||
10049 | } | |||
10050 | ||||
10051 | bool Sema::RebuildNestedNameSpecifierInCurrentInstantiation(CXXScopeSpec &SS) { | |||
10052 | if (SS.isInvalid()) | |||
10053 | return true; | |||
10054 | ||||
10055 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); | |||
10056 | CurrentInstantiationRebuilder Rebuilder(*this, SS.getRange().getBegin(), | |||
10057 | DeclarationName()); | |||
10058 | NestedNameSpecifierLoc Rebuilt | |||
10059 | = Rebuilder.TransformNestedNameSpecifierLoc(QualifierLoc); | |||
10060 | if (!Rebuilt) | |||
10061 | return true; | |||
10062 | ||||
10063 | SS.Adopt(Rebuilt); | |||
10064 | return false; | |||
10065 | } | |||
10066 | ||||
10067 | /// Rebuild the template parameters now that we know we're in a current | |||
10068 | /// instantiation. | |||
10069 | bool Sema::RebuildTemplateParamsInCurrentInstantiation( | |||
10070 | TemplateParameterList *Params) { | |||
10071 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { | |||
10072 | Decl *Param = Params->getParam(I); | |||
10073 | ||||
10074 | // There is nothing to rebuild in a type parameter. | |||
10075 | if (isa<TemplateTypeParmDecl>(Param)) | |||
10076 | continue; | |||
10077 | ||||
10078 | // Rebuild the template parameter list of a template template parameter. | |||
10079 | if (TemplateTemplateParmDecl *TTP | |||
10080 | = dyn_cast<TemplateTemplateParmDecl>(Param)) { | |||
10081 | if (RebuildTemplateParamsInCurrentInstantiation( | |||
10082 | TTP->getTemplateParameters())) | |||
10083 | return true; | |||
10084 | ||||
10085 | continue; | |||
10086 | } | |||
10087 | ||||
10088 | // Rebuild the type of a non-type template parameter. | |||
10089 | NonTypeTemplateParmDecl *NTTP = cast<NonTypeTemplateParmDecl>(Param); | |||
10090 | TypeSourceInfo *NewTSI | |||
10091 | = RebuildTypeInCurrentInstantiation(NTTP->getTypeSourceInfo(), | |||
10092 | NTTP->getLocation(), | |||
10093 | NTTP->getDeclName()); | |||
10094 | if (!NewTSI) | |||
10095 | return true; | |||
10096 | ||||
10097 | if (NewTSI->getType()->isUndeducedType()) { | |||
10098 | // C++17 [temp.dep.expr]p3: | |||
10099 | // An id-expression is type-dependent if it contains | |||
10100 | // - an identifier associated by name lookup with a non-type | |||
10101 | // template-parameter declared with a type that contains a | |||
10102 | // placeholder type (7.1.7.4), | |||
10103 | NewTSI = SubstAutoTypeSourceInfo(NewTSI, Context.DependentTy); | |||
10104 | } | |||
10105 | ||||
10106 | if (NewTSI != NTTP->getTypeSourceInfo()) { | |||
10107 | NTTP->setTypeSourceInfo(NewTSI); | |||
10108 | NTTP->setType(NewTSI->getType()); | |||
10109 | } | |||
10110 | } | |||
10111 | ||||
10112 | return false; | |||
10113 | } | |||
10114 | ||||
10115 | /// Produces a formatted string that describes the binding of | |||
10116 | /// template parameters to template arguments. | |||
10117 | std::string | |||
10118 | Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, | |||
10119 | const TemplateArgumentList &Args) { | |||
10120 | return getTemplateArgumentBindingsText(Params, Args.data(), Args.size()); | |||
10121 | } | |||
10122 | ||||
10123 | std::string | |||
10124 | Sema::getTemplateArgumentBindingsText(const TemplateParameterList *Params, | |||
10125 | const TemplateArgument *Args, | |||
10126 | unsigned NumArgs) { | |||
10127 | SmallString<128> Str; | |||
10128 | llvm::raw_svector_ostream Out(Str); | |||
10129 | ||||
10130 | if (!Params || Params->size() == 0 || NumArgs == 0) | |||
10131 | return std::string(); | |||
10132 | ||||
10133 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { | |||
10134 | if (I >= NumArgs) | |||
10135 | break; | |||
10136 | ||||
10137 | if (I == 0) | |||
10138 | Out << "[with "; | |||
10139 | else | |||
10140 | Out << ", "; | |||
10141 | ||||
10142 | if (const IdentifierInfo *Id = Params->getParam(I)->getIdentifier()) { | |||
10143 | Out << Id->getName(); | |||
10144 | } else { | |||
10145 | Out << '$' << I; | |||
10146 | } | |||
10147 | ||||
10148 | Out << " = "; | |||
10149 | Args[I].print(getPrintingPolicy(), Out); | |||
10150 | } | |||
10151 | ||||
10152 | Out << ']'; | |||
10153 | return Out.str(); | |||
10154 | } | |||
10155 | ||||
10156 | void Sema::MarkAsLateParsedTemplate(FunctionDecl *FD, Decl *FnD, | |||
10157 | CachedTokens &Toks) { | |||
10158 | if (!FD) | |||
10159 | return; | |||
10160 | ||||
10161 | auto LPT = llvm::make_unique<LateParsedTemplate>(); | |||
10162 | ||||
10163 | // Take tokens to avoid allocations | |||
10164 | LPT->Toks.swap(Toks); | |||
10165 | LPT->D = FnD; | |||
10166 | LateParsedTemplateMap.insert(std::make_pair(FD, std::move(LPT))); | |||
10167 | ||||
10168 | FD->setLateTemplateParsed(true); | |||
10169 | } | |||
10170 | ||||
10171 | void Sema::UnmarkAsLateParsedTemplate(FunctionDecl *FD) { | |||
10172 | if (!FD) | |||
10173 | return; | |||
10174 | FD->setLateTemplateParsed(false); | |||
10175 | } | |||
10176 | ||||
10177 | bool Sema::IsInsideALocalClassWithinATemplateFunction() { | |||
10178 | DeclContext *DC = CurContext; | |||
10179 | ||||
10180 | while (DC) { | |||
10181 | if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(CurContext)) { | |||
10182 | const FunctionDecl *FD = RD->isLocalClass(); | |||
10183 | return (FD && FD->getTemplatedKind() != FunctionDecl::TK_NonTemplate); | |||
10184 | } else if (DC->isTranslationUnit() || DC->isNamespace()) | |||
10185 | return false; | |||
10186 | ||||
10187 | DC = DC->getParent(); | |||
10188 | } | |||
10189 | return false; | |||
10190 | } | |||
10191 | ||||
10192 | namespace { | |||
10193 | /// Walk the path from which a declaration was instantiated, and check | |||
10194 | /// that every explicit specialization along that path is visible. This enforces | |||
10195 | /// C++ [temp.expl.spec]/6: | |||
10196 | /// | |||
10197 | /// If a template, a member template or a member of a class template is | |||
10198 | /// explicitly specialized then that specialization shall be declared before | |||
10199 | /// the first use of that specialization that would cause an implicit | |||
10200 | /// instantiation to take place, in every translation unit in which such a | |||
10201 | /// use occurs; no diagnostic is required. | |||
10202 | /// | |||
10203 | /// and also C++ [temp.class.spec]/1: | |||
10204 | /// | |||
10205 | /// A partial specialization shall be declared before the first use of a | |||
10206 | /// class template specialization that would make use of the partial | |||
10207 | /// specialization as the result of an implicit or explicit instantiation | |||
10208 | /// in every translation unit in which such a use occurs; no diagnostic is | |||
10209 | /// required. | |||
10210 | class ExplicitSpecializationVisibilityChecker { | |||
10211 | Sema &S; | |||
10212 | SourceLocation Loc; | |||
10213 | llvm::SmallVector<Module *, 8> Modules; | |||
10214 | ||||
10215 | public: | |||
10216 | ExplicitSpecializationVisibilityChecker(Sema &S, SourceLocation Loc) | |||
10217 | : S(S), Loc(Loc) {} | |||
10218 | ||||
10219 | void check(NamedDecl *ND) { | |||
10220 | if (auto *FD = dyn_cast<FunctionDecl>(ND)) | |||
10221 | return checkImpl(FD); | |||
10222 | if (auto *RD = dyn_cast<CXXRecordDecl>(ND)) | |||
10223 | return checkImpl(RD); | |||
10224 | if (auto *VD = dyn_cast<VarDecl>(ND)) | |||
10225 | return checkImpl(VD); | |||
10226 | if (auto *ED = dyn_cast<EnumDecl>(ND)) | |||
10227 | return checkImpl(ED); | |||
10228 | } | |||
10229 | ||||
10230 | private: | |||
10231 | void diagnose(NamedDecl *D, bool IsPartialSpec) { | |||
10232 | auto Kind = IsPartialSpec ? Sema::MissingImportKind::PartialSpecialization | |||
10233 | : Sema::MissingImportKind::ExplicitSpecialization; | |||
10234 | const bool Recover = true; | |||
10235 | ||||
10236 | // If we got a custom set of modules (because only a subset of the | |||
10237 | // declarations are interesting), use them, otherwise let | |||
10238 | // diagnoseMissingImport intelligently pick some. | |||
10239 | if (Modules.empty()) | |||
10240 | S.diagnoseMissingImport(Loc, D, Kind, Recover); | |||
10241 | else | |||
10242 | S.diagnoseMissingImport(Loc, D, D->getLocation(), Modules, Kind, Recover); | |||
10243 | } | |||
10244 | ||||
10245 | // Check a specific declaration. There are three problematic cases: | |||
10246 | // | |||
10247 | // 1) The declaration is an explicit specialization of a template | |||
10248 | // specialization. | |||
10249 | // 2) The declaration is an explicit specialization of a member of an | |||
10250 | // templated class. | |||
10251 | // 3) The declaration is an instantiation of a template, and that template | |||
10252 | // is an explicit specialization of a member of a templated class. | |||
10253 | // | |||
10254 | // We don't need to go any deeper than that, as the instantiation of the | |||
10255 | // surrounding class / etc is not triggered by whatever triggered this | |||
10256 | // instantiation, and thus should be checked elsewhere. | |||
10257 | template<typename SpecDecl> | |||
10258 | void checkImpl(SpecDecl *Spec) { | |||
10259 | bool IsHiddenExplicitSpecialization = false; | |||
10260 | if (Spec->getTemplateSpecializationKind() == TSK_ExplicitSpecialization) { | |||
10261 | IsHiddenExplicitSpecialization = | |||
10262 | Spec->getMemberSpecializationInfo() | |||
10263 | ? !S.hasVisibleMemberSpecialization(Spec, &Modules) | |||
10264 | : !S.hasVisibleExplicitSpecialization(Spec, &Modules); | |||
10265 | } else { | |||
10266 | checkInstantiated(Spec); | |||
10267 | } | |||
10268 | ||||
10269 | if (IsHiddenExplicitSpecialization) | |||
10270 | diagnose(Spec->getMostRecentDecl(), false); | |||
10271 | } | |||
10272 | ||||
10273 | void checkInstantiated(FunctionDecl *FD) { | |||
10274 | if (auto *TD = FD->getPrimaryTemplate()) | |||
10275 | checkTemplate(TD); | |||
10276 | } | |||
10277 | ||||
10278 | void checkInstantiated(CXXRecordDecl *RD) { | |||
10279 | auto *SD = dyn_cast<ClassTemplateSpecializationDecl>(RD); | |||
10280 | if (!SD) | |||
10281 | return; | |||
10282 | ||||
10283 | auto From = SD->getSpecializedTemplateOrPartial(); | |||
10284 | if (auto *TD = From.dyn_cast<ClassTemplateDecl *>()) | |||
10285 | checkTemplate(TD); | |||
10286 | else if (auto *TD = | |||
10287 | From.dyn_cast<ClassTemplatePartialSpecializationDecl *>()) { | |||
10288 | if (!S.hasVisibleDeclaration(TD)) | |||
10289 | diagnose(TD, true); | |||
10290 | checkTemplate(TD); | |||
10291 | } | |||
10292 | } | |||
10293 | ||||
10294 | void checkInstantiated(VarDecl *RD) { | |||
10295 | auto *SD = dyn_cast<VarTemplateSpecializationDecl>(RD); | |||
10296 | if (!SD) | |||
10297 | return; | |||
10298 | ||||
10299 | auto From = SD->getSpecializedTemplateOrPartial(); | |||
10300 | if (auto *TD = From.dyn_cast<VarTemplateDecl *>()) | |||
10301 | checkTemplate(TD); | |||
10302 | else if (auto *TD = | |||
10303 | From.dyn_cast<VarTemplatePartialSpecializationDecl *>()) { | |||
10304 | if (!S.hasVisibleDeclaration(TD)) | |||
10305 | diagnose(TD, true); | |||
10306 | checkTemplate(TD); | |||
10307 | } | |||
10308 | } | |||
10309 | ||||
10310 | void checkInstantiated(EnumDecl *FD) {} | |||
10311 | ||||
10312 | template<typename TemplDecl> | |||
10313 | void checkTemplate(TemplDecl *TD) { | |||
10314 | if (TD->isMemberSpecialization()) { | |||
10315 | if (!S.hasVisibleMemberSpecialization(TD, &Modules)) | |||
10316 | diagnose(TD->getMostRecentDecl(), false); | |||
10317 | } | |||
10318 | } | |||
10319 | }; | |||
10320 | } // end anonymous namespace | |||
10321 | ||||
10322 | void Sema::checkSpecializationVisibility(SourceLocation Loc, NamedDecl *Spec) { | |||
10323 | if (!getLangOpts().Modules) | |||
10324 | return; | |||
10325 | ||||
10326 | ExplicitSpecializationVisibilityChecker(*this, Loc).check(Spec); | |||
10327 | } | |||
10328 | ||||
10329 | /// Check whether a template partial specialization that we've discovered | |||
10330 | /// is hidden, and produce suitable diagnostics if so. | |||
10331 | void Sema::checkPartialSpecializationVisibility(SourceLocation Loc, | |||
10332 | NamedDecl *Spec) { | |||
10333 | llvm::SmallVector<Module *, 8> Modules; | |||
10334 | if (!hasVisibleDeclaration(Spec, &Modules)) | |||
10335 | diagnoseMissingImport(Loc, Spec, Spec->getLocation(), Modules, | |||
10336 | MissingImportKind::PartialSpecialization, | |||
10337 | /*Recover*/true); | |||
10338 | } |
1 | //===- DeclTemplate.h - Classes for representing C++ templates --*- C++ -*-===// | |||
2 | // | |||
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | |||
4 | // See https://llvm.org/LICENSE.txt for license information. | |||
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | |||
6 | // | |||
7 | //===----------------------------------------------------------------------===// | |||
8 | // | |||
9 | /// \file | |||
10 | /// Defines the C++ template declaration subclasses. | |||
11 | // | |||
12 | //===----------------------------------------------------------------------===// | |||
13 | ||||
14 | #ifndef LLVM_CLANG_AST_DECLTEMPLATE_H | |||
15 | #define LLVM_CLANG_AST_DECLTEMPLATE_H | |||
16 | ||||
17 | #include "clang/AST/Decl.h" | |||
18 | #include "clang/AST/DeclBase.h" | |||
19 | #include "clang/AST/DeclCXX.h" | |||
20 | #include "clang/AST/DeclarationName.h" | |||
21 | #include "clang/AST/Redeclarable.h" | |||
22 | #include "clang/AST/TemplateBase.h" | |||
23 | #include "clang/AST/Type.h" | |||
24 | #include "clang/Basic/LLVM.h" | |||
25 | #include "clang/Basic/SourceLocation.h" | |||
26 | #include "clang/Basic/Specifiers.h" | |||
27 | #include "llvm/ADT/ArrayRef.h" | |||
28 | #include "llvm/ADT/FoldingSet.h" | |||
29 | #include "llvm/ADT/PointerIntPair.h" | |||
30 | #include "llvm/ADT/PointerUnion.h" | |||
31 | #include "llvm/ADT/iterator.h" | |||
32 | #include "llvm/ADT/iterator_range.h" | |||
33 | #include "llvm/Support/Casting.h" | |||
34 | #include "llvm/Support/Compiler.h" | |||
35 | #include "llvm/Support/TrailingObjects.h" | |||
36 | #include <cassert> | |||
37 | #include <cstddef> | |||
38 | #include <cstdint> | |||
39 | #include <iterator> | |||
40 | #include <utility> | |||
41 | ||||
42 | namespace clang { | |||
43 | ||||
44 | enum BuiltinTemplateKind : int; | |||
45 | class ClassTemplateDecl; | |||
46 | class ClassTemplatePartialSpecializationDecl; | |||
47 | class Expr; | |||
48 | class FunctionTemplateDecl; | |||
49 | class IdentifierInfo; | |||
50 | class NonTypeTemplateParmDecl; | |||
51 | class TemplateDecl; | |||
52 | class TemplateTemplateParmDecl; | |||
53 | class TemplateTypeParmDecl; | |||
54 | class UnresolvedSetImpl; | |||
55 | class VarTemplateDecl; | |||
56 | class VarTemplatePartialSpecializationDecl; | |||
57 | ||||
58 | /// Stores a template parameter of any kind. | |||
59 | using TemplateParameter = | |||
60 | llvm::PointerUnion3<TemplateTypeParmDecl *, NonTypeTemplateParmDecl *, | |||
61 | TemplateTemplateParmDecl *>; | |||
62 | ||||
63 | NamedDecl *getAsNamedDecl(TemplateParameter P); | |||
64 | ||||
65 | /// Stores a list of template parameters for a TemplateDecl and its | |||
66 | /// derived classes. | |||
67 | class TemplateParameterList final | |||
68 | : private llvm::TrailingObjects<TemplateParameterList, NamedDecl *, | |||
69 | Expr *> { | |||
70 | /// The location of the 'template' keyword. | |||
71 | SourceLocation TemplateLoc; | |||
72 | ||||
73 | /// The locations of the '<' and '>' angle brackets. | |||
74 | SourceLocation LAngleLoc, RAngleLoc; | |||
75 | ||||
76 | /// The number of template parameters in this template | |||
77 | /// parameter list. | |||
78 | unsigned NumParams : 30; | |||
79 | ||||
80 | /// Whether this template parameter list contains an unexpanded parameter | |||
81 | /// pack. | |||
82 | unsigned ContainsUnexpandedParameterPack : 1; | |||
83 | ||||
84 | /// Whether this template parameter list has an associated requires-clause | |||
85 | unsigned HasRequiresClause : 1; | |||
86 | ||||
87 | protected: | |||
88 | TemplateParameterList(SourceLocation TemplateLoc, SourceLocation LAngleLoc, | |||
89 | ArrayRef<NamedDecl *> Params, SourceLocation RAngleLoc, | |||
90 | Expr *RequiresClause); | |||
91 | ||||
92 | size_t numTrailingObjects(OverloadToken<NamedDecl *>) const { | |||
93 | return NumParams; | |||
94 | } | |||
95 | ||||
96 | size_t numTrailingObjects(OverloadToken<Expr *>) const { | |||
97 | return HasRequiresClause; | |||
98 | } | |||
99 | ||||
100 | public: | |||
101 | template <size_t N, bool HasRequiresClause> | |||
102 | friend class FixedSizeTemplateParameterListStorage; | |||
103 | friend TrailingObjects; | |||
104 | ||||
105 | static TemplateParameterList *Create(const ASTContext &C, | |||
106 | SourceLocation TemplateLoc, | |||
107 | SourceLocation LAngleLoc, | |||
108 | ArrayRef<NamedDecl *> Params, | |||
109 | SourceLocation RAngleLoc, | |||
110 | Expr *RequiresClause); | |||
111 | ||||
112 | /// Iterates through the template parameters in this list. | |||
113 | using iterator = NamedDecl **; | |||
114 | ||||
115 | /// Iterates through the template parameters in this list. | |||
116 | using const_iterator = NamedDecl * const *; | |||
117 | ||||
118 | iterator begin() { return getTrailingObjects<NamedDecl *>(); } | |||
119 | const_iterator begin() const { return getTrailingObjects<NamedDecl *>(); } | |||
120 | iterator end() { return begin() + NumParams; } | |||
121 | const_iterator end() const { return begin() + NumParams; } | |||
122 | ||||
123 | unsigned size() const { return NumParams; } | |||
124 | ||||
125 | ArrayRef<NamedDecl*> asArray() { | |||
126 | return llvm::makeArrayRef(begin(), end()); | |||
127 | } | |||
128 | ArrayRef<const NamedDecl*> asArray() const { | |||
129 | return llvm::makeArrayRef(begin(), size()); | |||
130 | } | |||
131 | ||||
132 | NamedDecl* getParam(unsigned Idx) { | |||
133 | assert(Idx < size() && "Template parameter index out-of-range")((Idx < size() && "Template parameter index out-of-range" ) ? static_cast<void> (0) : __assert_fail ("Idx < size() && \"Template parameter index out-of-range\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 133, __PRETTY_FUNCTION__)); | |||
134 | return begin()[Idx]; | |||
135 | } | |||
136 | const NamedDecl* getParam(unsigned Idx) const { | |||
137 | assert(Idx < size() && "Template parameter index out-of-range")((Idx < size() && "Template parameter index out-of-range" ) ? static_cast<void> (0) : __assert_fail ("Idx < size() && \"Template parameter index out-of-range\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 137, __PRETTY_FUNCTION__)); | |||
138 | return begin()[Idx]; | |||
139 | } | |||
140 | ||||
141 | /// Returns the minimum number of arguments needed to form a | |||
142 | /// template specialization. | |||
143 | /// | |||
144 | /// This may be fewer than the number of template parameters, if some of | |||
145 | /// the parameters have default arguments or if there is a parameter pack. | |||
146 | unsigned getMinRequiredArguments() const; | |||
147 | ||||
148 | /// Get the depth of this template parameter list in the set of | |||
149 | /// template parameter lists. | |||
150 | /// | |||
151 | /// The first template parameter list in a declaration will have depth 0, | |||
152 | /// the second template parameter list will have depth 1, etc. | |||
153 | unsigned getDepth() const; | |||
154 | ||||
155 | /// Determine whether this template parameter list contains an | |||
156 | /// unexpanded parameter pack. | |||
157 | bool containsUnexpandedParameterPack() const { | |||
158 | return ContainsUnexpandedParameterPack; | |||
159 | } | |||
160 | ||||
161 | /// The constraint-expression of the associated requires-clause. | |||
162 | Expr *getRequiresClause() { | |||
163 | return HasRequiresClause ? *getTrailingObjects<Expr *>() : nullptr; | |||
164 | } | |||
165 | ||||
166 | /// The constraint-expression of the associated requires-clause. | |||
167 | const Expr *getRequiresClause() const { | |||
168 | return HasRequiresClause ? *getTrailingObjects<Expr *>() : nullptr; | |||
169 | } | |||
170 | ||||
171 | SourceLocation getTemplateLoc() const { return TemplateLoc; } | |||
172 | SourceLocation getLAngleLoc() const { return LAngleLoc; } | |||
173 | SourceLocation getRAngleLoc() const { return RAngleLoc; } | |||
174 | ||||
175 | SourceRange getSourceRange() const LLVM_READONLY__attribute__((__pure__)) { | |||
176 | return SourceRange(TemplateLoc, RAngleLoc); | |||
177 | } | |||
178 | ||||
179 | void print(raw_ostream &Out, const ASTContext &Context, | |||
180 | bool OmitTemplateKW = false) const; | |||
181 | void print(raw_ostream &Out, const ASTContext &Context, | |||
182 | const PrintingPolicy &Policy, bool OmitTemplateKW = false) const; | |||
183 | ||||
184 | public: | |||
185 | // FIXME: workaround for MSVC 2013; remove when no longer needed | |||
186 | using FixedSizeStorageOwner = TrailingObjects::FixedSizeStorageOwner; | |||
187 | }; | |||
188 | ||||
189 | /// Stores a list of template parameters and the associated | |||
190 | /// requires-clause (if any) for a TemplateDecl and its derived classes. | |||
191 | /// Suitable for creating on the stack. | |||
192 | template <size_t N, bool HasRequiresClause> | |||
193 | class FixedSizeTemplateParameterListStorage | |||
194 | : public TemplateParameterList::FixedSizeStorageOwner { | |||
195 | typename TemplateParameterList::FixedSizeStorage< | |||
196 | NamedDecl *, Expr *>::with_counts< | |||
197 | N, HasRequiresClause ? 1u : 0u | |||
198 | >::type storage; | |||
199 | ||||
200 | public: | |||
201 | FixedSizeTemplateParameterListStorage(SourceLocation TemplateLoc, | |||
202 | SourceLocation LAngleLoc, | |||
203 | ArrayRef<NamedDecl *> Params, | |||
204 | SourceLocation RAngleLoc, | |||
205 | Expr *RequiresClause) | |||
206 | : FixedSizeStorageOwner( | |||
207 | (assert(N == Params.size())((N == Params.size()) ? static_cast<void> (0) : __assert_fail ("N == Params.size()", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 207, __PRETTY_FUNCTION__)), | |||
208 | assert(HasRequiresClause == static_cast<bool>(RequiresClause))((HasRequiresClause == static_cast<bool>(RequiresClause )) ? static_cast<void> (0) : __assert_fail ("HasRequiresClause == static_cast<bool>(RequiresClause)" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 208, __PRETTY_FUNCTION__)), | |||
209 | new (static_cast<void *>(&storage)) TemplateParameterList( | |||
210 | TemplateLoc, LAngleLoc, Params, RAngleLoc, RequiresClause))) {} | |||
211 | }; | |||
212 | ||||
213 | /// A template argument list. | |||
214 | class TemplateArgumentList final | |||
215 | : private llvm::TrailingObjects<TemplateArgumentList, TemplateArgument> { | |||
216 | /// The template argument list. | |||
217 | const TemplateArgument *Arguments; | |||
218 | ||||
219 | /// The number of template arguments in this template | |||
220 | /// argument list. | |||
221 | unsigned NumArguments; | |||
222 | ||||
223 | // Constructs an instance with an internal Argument list, containing | |||
224 | // a copy of the Args array. (Called by CreateCopy) | |||
225 | TemplateArgumentList(ArrayRef<TemplateArgument> Args); | |||
226 | ||||
227 | public: | |||
228 | friend TrailingObjects; | |||
229 | ||||
230 | TemplateArgumentList(const TemplateArgumentList &) = delete; | |||
231 | TemplateArgumentList &operator=(const TemplateArgumentList &) = delete; | |||
232 | ||||
233 | /// Type used to indicate that the template argument list itself is a | |||
234 | /// stack object. It does not own its template arguments. | |||
235 | enum OnStackType { OnStack }; | |||
236 | ||||
237 | /// Create a new template argument list that copies the given set of | |||
238 | /// template arguments. | |||
239 | static TemplateArgumentList *CreateCopy(ASTContext &Context, | |||
240 | ArrayRef<TemplateArgument> Args); | |||
241 | ||||
242 | /// Construct a new, temporary template argument list on the stack. | |||
243 | /// | |||
244 | /// The template argument list does not own the template arguments | |||
245 | /// provided. | |||
246 | explicit TemplateArgumentList(OnStackType, ArrayRef<TemplateArgument> Args) | |||
247 | : Arguments(Args.data()), NumArguments(Args.size()) {} | |||
248 | ||||
249 | /// Produces a shallow copy of the given template argument list. | |||
250 | /// | |||
251 | /// This operation assumes that the input argument list outlives it. | |||
252 | /// This takes the list as a pointer to avoid looking like a copy | |||
253 | /// constructor, since this really really isn't safe to use that | |||
254 | /// way. | |||
255 | explicit TemplateArgumentList(const TemplateArgumentList *Other) | |||
256 | : Arguments(Other->data()), NumArguments(Other->size()) {} | |||
257 | ||||
258 | /// Retrieve the template argument at a given index. | |||
259 | const TemplateArgument &get(unsigned Idx) const { | |||
260 | assert(Idx < NumArguments && "Invalid template argument index")((Idx < NumArguments && "Invalid template argument index" ) ? static_cast<void> (0) : __assert_fail ("Idx < NumArguments && \"Invalid template argument index\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 260, __PRETTY_FUNCTION__)); | |||
261 | return data()[Idx]; | |||
262 | } | |||
263 | ||||
264 | /// Retrieve the template argument at a given index. | |||
265 | const TemplateArgument &operator[](unsigned Idx) const { return get(Idx); } | |||
266 | ||||
267 | /// Produce this as an array ref. | |||
268 | ArrayRef<TemplateArgument> asArray() const { | |||
269 | return llvm::makeArrayRef(data(), size()); | |||
270 | } | |||
271 | ||||
272 | /// Retrieve the number of template arguments in this | |||
273 | /// template argument list. | |||
274 | unsigned size() const { return NumArguments; } | |||
275 | ||||
276 | /// Retrieve a pointer to the template argument list. | |||
277 | const TemplateArgument *data() const { return Arguments; } | |||
278 | }; | |||
279 | ||||
280 | void *allocateDefaultArgStorageChain(const ASTContext &C); | |||
281 | ||||
282 | /// Storage for a default argument. This is conceptually either empty, or an | |||
283 | /// argument value, or a pointer to a previous declaration that had a default | |||
284 | /// argument. | |||
285 | /// | |||
286 | /// However, this is complicated by modules: while we require all the default | |||
287 | /// arguments for a template to be equivalent, there may be more than one, and | |||
288 | /// we need to track all the originating parameters to determine if the default | |||
289 | /// argument is visible. | |||
290 | template<typename ParmDecl, typename ArgType> | |||
291 | class DefaultArgStorage { | |||
292 | /// Storage for both the value *and* another parameter from which we inherit | |||
293 | /// the default argument. This is used when multiple default arguments for a | |||
294 | /// parameter are merged together from different modules. | |||
295 | struct Chain { | |||
296 | ParmDecl *PrevDeclWithDefaultArg; | |||
297 | ArgType Value; | |||
298 | }; | |||
299 | static_assert(sizeof(Chain) == sizeof(void *) * 2, | |||
300 | "non-pointer argument type?"); | |||
301 | ||||
302 | llvm::PointerUnion3<ArgType, ParmDecl*, Chain*> ValueOrInherited; | |||
303 | ||||
304 | static ParmDecl *getParmOwningDefaultArg(ParmDecl *Parm) { | |||
305 | const DefaultArgStorage &Storage = Parm->getDefaultArgStorage(); | |||
306 | if (auto *Prev = Storage.ValueOrInherited.template dyn_cast<ParmDecl *>()) | |||
307 | Parm = Prev; | |||
308 | assert(!Parm->getDefaultArgStorage()((!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && "should only be one level of indirection" ) ? static_cast<void> (0) : __assert_fail ("!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && \"should only be one level of indirection\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 310, __PRETTY_FUNCTION__)) | |||
309 | .ValueOrInherited.template is<ParmDecl *>() &&((!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && "should only be one level of indirection" ) ? static_cast<void> (0) : __assert_fail ("!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && \"should only be one level of indirection\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 310, __PRETTY_FUNCTION__)) | |||
310 | "should only be one level of indirection")((!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && "should only be one level of indirection" ) ? static_cast<void> (0) : __assert_fail ("!Parm->getDefaultArgStorage() .ValueOrInherited.template is<ParmDecl *>() && \"should only be one level of indirection\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 310, __PRETTY_FUNCTION__)); | |||
311 | return Parm; | |||
312 | } | |||
313 | ||||
314 | public: | |||
315 | DefaultArgStorage() : ValueOrInherited(ArgType()) {} | |||
316 | ||||
317 | /// Determine whether there is a default argument for this parameter. | |||
318 | bool isSet() const { return !ValueOrInherited.isNull(); } | |||
319 | ||||
320 | /// Determine whether the default argument for this parameter was inherited | |||
321 | /// from a previous declaration of the same entity. | |||
322 | bool isInherited() const { return ValueOrInherited.template is<ParmDecl*>(); } | |||
323 | ||||
324 | /// Get the default argument's value. This does not consider whether the | |||
325 | /// default argument is visible. | |||
326 | ArgType get() const { | |||
327 | const DefaultArgStorage *Storage = this; | |||
328 | if (const auto *Prev = ValueOrInherited.template dyn_cast<ParmDecl *>()) | |||
329 | Storage = &Prev->getDefaultArgStorage(); | |||
330 | if (const auto *C = Storage->ValueOrInherited.template dyn_cast<Chain *>()) | |||
331 | return C->Value; | |||
332 | return Storage->ValueOrInherited.template get<ArgType>(); | |||
333 | } | |||
334 | ||||
335 | /// Get the parameter from which we inherit the default argument, if any. | |||
336 | /// This is the parameter on which the default argument was actually written. | |||
337 | const ParmDecl *getInheritedFrom() const { | |||
338 | if (const auto *D = ValueOrInherited.template dyn_cast<ParmDecl *>()) | |||
339 | return D; | |||
340 | if (const auto *C = ValueOrInherited.template dyn_cast<Chain *>()) | |||
341 | return C->PrevDeclWithDefaultArg; | |||
342 | return nullptr; | |||
343 | } | |||
344 | ||||
345 | /// Set the default argument. | |||
346 | void set(ArgType Arg) { | |||
347 | assert(!isSet() && "default argument already set")((!isSet() && "default argument already set") ? static_cast <void> (0) : __assert_fail ("!isSet() && \"default argument already set\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 347, __PRETTY_FUNCTION__)); | |||
348 | ValueOrInherited = Arg; | |||
349 | } | |||
350 | ||||
351 | /// Set that the default argument was inherited from another parameter. | |||
352 | void setInherited(const ASTContext &C, ParmDecl *InheritedFrom) { | |||
353 | assert(!isInherited() && "default argument already inherited")((!isInherited() && "default argument already inherited" ) ? static_cast<void> (0) : __assert_fail ("!isInherited() && \"default argument already inherited\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 353, __PRETTY_FUNCTION__)); | |||
354 | InheritedFrom = getParmOwningDefaultArg(InheritedFrom); | |||
355 | if (!isSet()) | |||
356 | ValueOrInherited = InheritedFrom; | |||
357 | else | |||
358 | ValueOrInherited = new (allocateDefaultArgStorageChain(C)) | |||
359 | Chain{InheritedFrom, ValueOrInherited.template get<ArgType>()}; | |||
360 | } | |||
361 | ||||
362 | /// Remove the default argument, even if it was inherited. | |||
363 | void clear() { | |||
364 | ValueOrInherited = ArgType(); | |||
365 | } | |||
366 | }; | |||
367 | ||||
368 | //===----------------------------------------------------------------------===// | |||
369 | // Kinds of Templates | |||
370 | //===----------------------------------------------------------------------===// | |||
371 | ||||
372 | /// Stores the template parameter list and associated constraints for | |||
373 | /// \c TemplateDecl objects that track associated constraints. | |||
374 | class ConstrainedTemplateDeclInfo { | |||
375 | friend TemplateDecl; | |||
376 | ||||
377 | public: | |||
378 | ConstrainedTemplateDeclInfo() = default; | |||
379 | ||||
380 | TemplateParameterList *getTemplateParameters() const { | |||
381 | return TemplateParams; | |||
382 | } | |||
383 | ||||
384 | Expr *getAssociatedConstraints() const { return AssociatedConstraints; } | |||
385 | ||||
386 | protected: | |||
387 | void setTemplateParameters(TemplateParameterList *TParams) { | |||
388 | TemplateParams = TParams; | |||
389 | } | |||
390 | ||||
391 | void setAssociatedConstraints(Expr *AC) { AssociatedConstraints = AC; } | |||
392 | ||||
393 | TemplateParameterList *TemplateParams = nullptr; | |||
394 | Expr *AssociatedConstraints = nullptr; | |||
395 | }; | |||
396 | ||||
397 | ||||
398 | /// The base class of all kinds of template declarations (e.g., | |||
399 | /// class, function, etc.). | |||
400 | /// | |||
401 | /// The TemplateDecl class stores the list of template parameters and a | |||
402 | /// reference to the templated scoped declaration: the underlying AST node. | |||
403 | class TemplateDecl : public NamedDecl { | |||
404 | void anchor() override; | |||
405 | ||||
406 | protected: | |||
407 | // Construct a template decl with the given name and parameters. | |||
408 | // Used when there is no templated element (e.g., for tt-params). | |||
409 | TemplateDecl(ConstrainedTemplateDeclInfo *CTDI, Kind DK, DeclContext *DC, | |||
410 | SourceLocation L, DeclarationName Name, | |||
411 | TemplateParameterList *Params) | |||
412 | : NamedDecl(DK, DC, L, Name), TemplatedDecl(nullptr), | |||
413 | TemplateParams(CTDI) { | |||
414 | this->setTemplateParameters(Params); | |||
415 | } | |||
416 | ||||
417 | TemplateDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName Name, | |||
418 | TemplateParameterList *Params) | |||
419 | : TemplateDecl(nullptr, DK, DC, L, Name, Params) {} | |||
420 | ||||
421 | // Construct a template decl with name, parameters, and templated element. | |||
422 | TemplateDecl(ConstrainedTemplateDeclInfo *CTDI, Kind DK, DeclContext *DC, | |||
423 | SourceLocation L, DeclarationName Name, | |||
424 | TemplateParameterList *Params, NamedDecl *Decl) | |||
425 | : NamedDecl(DK, DC, L, Name), TemplatedDecl(Decl), | |||
426 | TemplateParams(CTDI) { | |||
427 | this->setTemplateParameters(Params); | |||
428 | } | |||
429 | ||||
430 | TemplateDecl(Kind DK, DeclContext *DC, SourceLocation L, DeclarationName Name, | |||
431 | TemplateParameterList *Params, NamedDecl *Decl) | |||
432 | : TemplateDecl(nullptr, DK, DC, L, Name, Params, Decl) {} | |||
433 | ||||
434 | public: | |||
435 | /// Get the list of template parameters | |||
436 | TemplateParameterList *getTemplateParameters() const { | |||
437 | const auto *const CTDI = | |||
438 | TemplateParams.dyn_cast<ConstrainedTemplateDeclInfo *>(); | |||
439 | return CTDI ? CTDI->getTemplateParameters() | |||
440 | : TemplateParams.get<TemplateParameterList *>(); | |||
441 | } | |||
442 | ||||
443 | /// Get the constraint-expression from the associated requires-clause (if any) | |||
444 | const Expr *getRequiresClause() const { | |||
445 | const TemplateParameterList *const TP = getTemplateParameters(); | |||
446 | return TP ? TP->getRequiresClause() : nullptr; | |||
447 | } | |||
448 | ||||
449 | Expr *getAssociatedConstraints() const { | |||
450 | const auto *const C = cast<TemplateDecl>(getCanonicalDecl()); | |||
451 | const auto *const CTDI = | |||
452 | C->TemplateParams.dyn_cast<ConstrainedTemplateDeclInfo *>(); | |||
453 | return CTDI ? CTDI->getAssociatedConstraints() : nullptr; | |||
454 | } | |||
455 | ||||
456 | /// Get the underlying, templated declaration. | |||
457 | NamedDecl *getTemplatedDecl() const { return TemplatedDecl; } | |||
458 | ||||
459 | // Implement isa/cast/dyncast/etc. | |||
460 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
461 | ||||
462 | static bool classofKind(Kind K) { | |||
463 | return K >= firstTemplate && K <= lastTemplate; | |||
464 | } | |||
465 | ||||
466 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { | |||
467 | return SourceRange(getTemplateParameters()->getTemplateLoc(), | |||
468 | TemplatedDecl->getSourceRange().getEnd()); | |||
469 | } | |||
470 | ||||
471 | protected: | |||
472 | NamedDecl *TemplatedDecl; | |||
473 | ||||
474 | /// The template parameter list and optional requires-clause | |||
475 | /// associated with this declaration; alternatively, a | |||
476 | /// \c ConstrainedTemplateDeclInfo if the associated constraints of the | |||
477 | /// template are being tracked by this particular declaration. | |||
478 | llvm::PointerUnion<TemplateParameterList *, | |||
479 | ConstrainedTemplateDeclInfo *> | |||
480 | TemplateParams; | |||
481 | ||||
482 | void setTemplateParameters(TemplateParameterList *TParams) { | |||
483 | if (auto *const CTDI = | |||
484 | TemplateParams.dyn_cast<ConstrainedTemplateDeclInfo *>()) { | |||
485 | CTDI->setTemplateParameters(TParams); | |||
486 | } else { | |||
487 | TemplateParams = TParams; | |||
488 | } | |||
489 | } | |||
490 | ||||
491 | void setAssociatedConstraints(Expr *AC) { | |||
492 | assert(isCanonicalDecl() &&((isCanonicalDecl() && "Attaching associated constraints to non-canonical Decl" ) ? static_cast<void> (0) : __assert_fail ("isCanonicalDecl() && \"Attaching associated constraints to non-canonical Decl\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 493, __PRETTY_FUNCTION__)) | |||
493 | "Attaching associated constraints to non-canonical Decl")((isCanonicalDecl() && "Attaching associated constraints to non-canonical Decl" ) ? static_cast<void> (0) : __assert_fail ("isCanonicalDecl() && \"Attaching associated constraints to non-canonical Decl\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 493, __PRETTY_FUNCTION__)); | |||
494 | TemplateParams.get<ConstrainedTemplateDeclInfo *>() | |||
495 | ->setAssociatedConstraints(AC); | |||
496 | } | |||
497 | ||||
498 | public: | |||
499 | /// Initialize the underlying templated declaration and | |||
500 | /// template parameters. | |||
501 | void init(NamedDecl *templatedDecl, TemplateParameterList* templateParams) { | |||
502 | assert(!TemplatedDecl && "TemplatedDecl already set!")((!TemplatedDecl && "TemplatedDecl already set!") ? static_cast <void> (0) : __assert_fail ("!TemplatedDecl && \"TemplatedDecl already set!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 502, __PRETTY_FUNCTION__)); | |||
503 | assert(!TemplateParams && "TemplateParams already set!")((!TemplateParams && "TemplateParams already set!") ? static_cast<void> (0) : __assert_fail ("!TemplateParams && \"TemplateParams already set!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 503, __PRETTY_FUNCTION__)); | |||
504 | TemplatedDecl = templatedDecl; | |||
505 | TemplateParams = templateParams; | |||
506 | } | |||
507 | }; | |||
508 | ||||
509 | /// Provides information about a function template specialization, | |||
510 | /// which is a FunctionDecl that has been explicitly specialization or | |||
511 | /// instantiated from a function template. | |||
512 | class FunctionTemplateSpecializationInfo final | |||
513 | : public llvm::FoldingSetNode, | |||
514 | private llvm::TrailingObjects<FunctionTemplateSpecializationInfo, | |||
515 | MemberSpecializationInfo *> { | |||
516 | /// The function template specialization that this structure describes and a | |||
517 | /// flag indicating if the function is a member specialization. | |||
518 | llvm::PointerIntPair<FunctionDecl *, 1, bool> Function; | |||
519 | ||||
520 | /// The function template from which this function template | |||
521 | /// specialization was generated. | |||
522 | /// | |||
523 | /// The two bits contain the top 4 values of TemplateSpecializationKind. | |||
524 | llvm::PointerIntPair<FunctionTemplateDecl *, 2> Template; | |||
525 | ||||
526 | public: | |||
527 | /// The template arguments used to produce the function template | |||
528 | /// specialization from the function template. | |||
529 | const TemplateArgumentList *TemplateArguments; | |||
530 | ||||
531 | /// The template arguments as written in the sources, if provided. | |||
532 | /// FIXME: Normally null; tail-allocate this. | |||
533 | const ASTTemplateArgumentListInfo *TemplateArgumentsAsWritten; | |||
534 | ||||
535 | /// The point at which this function template specialization was | |||
536 | /// first instantiated. | |||
537 | SourceLocation PointOfInstantiation; | |||
538 | ||||
539 | private: | |||
540 | FunctionTemplateSpecializationInfo( | |||
541 | FunctionDecl *FD, FunctionTemplateDecl *Template, | |||
542 | TemplateSpecializationKind TSK, const TemplateArgumentList *TemplateArgs, | |||
543 | const ASTTemplateArgumentListInfo *TemplateArgsAsWritten, | |||
544 | SourceLocation POI, MemberSpecializationInfo *MSInfo) | |||
545 | : Function(FD, MSInfo ? 1 : 0), Template(Template, TSK - 1), | |||
546 | TemplateArguments(TemplateArgs), | |||
547 | TemplateArgumentsAsWritten(TemplateArgsAsWritten), | |||
548 | PointOfInstantiation(POI) { | |||
549 | if (MSInfo) | |||
550 | getTrailingObjects<MemberSpecializationInfo *>()[0] = MSInfo; | |||
551 | } | |||
552 | ||||
553 | size_t numTrailingObjects(OverloadToken<MemberSpecializationInfo*>) const { | |||
554 | return Function.getInt(); | |||
555 | } | |||
556 | ||||
557 | public: | |||
558 | friend TrailingObjects; | |||
559 | ||||
560 | static FunctionTemplateSpecializationInfo * | |||
561 | Create(ASTContext &C, FunctionDecl *FD, FunctionTemplateDecl *Template, | |||
562 | TemplateSpecializationKind TSK, | |||
563 | const TemplateArgumentList *TemplateArgs, | |||
564 | const TemplateArgumentListInfo *TemplateArgsAsWritten, | |||
565 | SourceLocation POI, MemberSpecializationInfo *MSInfo); | |||
566 | ||||
567 | /// Retrieve the declaration of the function template specialization. | |||
568 | FunctionDecl *getFunction() const { return Function.getPointer(); } | |||
569 | ||||
570 | /// Retrieve the template from which this function was specialized. | |||
571 | FunctionTemplateDecl *getTemplate() const { return Template.getPointer(); } | |||
572 | ||||
573 | /// Determine what kind of template specialization this is. | |||
574 | TemplateSpecializationKind getTemplateSpecializationKind() const { | |||
575 | return (TemplateSpecializationKind)(Template.getInt() + 1); | |||
576 | } | |||
577 | ||||
578 | bool isExplicitSpecialization() const { | |||
579 | return getTemplateSpecializationKind() == TSK_ExplicitSpecialization; | |||
580 | } | |||
581 | ||||
582 | /// True if this declaration is an explicit specialization, | |||
583 | /// explicit instantiation declaration, or explicit instantiation | |||
584 | /// definition. | |||
585 | bool isExplicitInstantiationOrSpecialization() const { | |||
586 | return isTemplateExplicitInstantiationOrSpecialization( | |||
587 | getTemplateSpecializationKind()); | |||
588 | } | |||
589 | ||||
590 | /// Set the template specialization kind. | |||
591 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK) { | |||
592 | assert(TSK != TSK_Undeclared &&((TSK != TSK_Undeclared && "Cannot encode TSK_Undeclared for a function template specialization" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode TSK_Undeclared for a function template specialization\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 593, __PRETTY_FUNCTION__)) | |||
593 | "Cannot encode TSK_Undeclared for a function template specialization")((TSK != TSK_Undeclared && "Cannot encode TSK_Undeclared for a function template specialization" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode TSK_Undeclared for a function template specialization\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 593, __PRETTY_FUNCTION__)); | |||
594 | Template.setInt(TSK - 1); | |||
595 | } | |||
596 | ||||
597 | /// Retrieve the first point of instantiation of this function | |||
598 | /// template specialization. | |||
599 | /// | |||
600 | /// The point of instantiation may be an invalid source location if this | |||
601 | /// function has yet to be instantiated. | |||
602 | SourceLocation getPointOfInstantiation() const { | |||
603 | return PointOfInstantiation; | |||
604 | } | |||
605 | ||||
606 | /// Set the (first) point of instantiation of this function template | |||
607 | /// specialization. | |||
608 | void setPointOfInstantiation(SourceLocation POI) { | |||
609 | PointOfInstantiation = POI; | |||
610 | } | |||
611 | ||||
612 | /// Get the specialization info if this function template specialization is | |||
613 | /// also a member specialization: | |||
614 | /// | |||
615 | /// \code | |||
616 | /// template<typename> struct A { | |||
617 | /// template<typename> void f(); | |||
618 | /// template<> void f<int>(); // ClassScopeFunctionSpecializationDecl | |||
619 | /// }; | |||
620 | /// \endcode | |||
621 | /// | |||
622 | /// Here, A<int>::f<int> is a function template specialization that is | |||
623 | /// an explicit specialization of A<int>::f, but it's also a member | |||
624 | /// specialization (an implicit instantiation in this case) of A::f<int>. | |||
625 | /// Further: | |||
626 | /// | |||
627 | /// \code | |||
628 | /// template<> template<> void A<int>::f<int>() {} | |||
629 | /// \endcode | |||
630 | /// | |||
631 | /// ... declares a function template specialization that is an explicit | |||
632 | /// specialization of A<int>::f, and is also an explicit member | |||
633 | /// specialization of A::f<int>. | |||
634 | /// | |||
635 | /// Note that the TemplateSpecializationKind of the MemberSpecializationInfo | |||
636 | /// need not be the same as that returned by getTemplateSpecializationKind(), | |||
637 | /// and represents the relationship between the function and the class-scope | |||
638 | /// explicit specialization in the original templated class -- whereas our | |||
639 | /// TemplateSpecializationKind represents the relationship between the | |||
640 | /// function and the function template, and should always be | |||
641 | /// TSK_ExplicitSpecialization whenever we have MemberSpecializationInfo. | |||
642 | MemberSpecializationInfo *getMemberSpecializationInfo() const { | |||
643 | return numTrailingObjects(OverloadToken<MemberSpecializationInfo *>()) | |||
644 | ? getTrailingObjects<MemberSpecializationInfo *>()[0] | |||
645 | : nullptr; | |||
646 | } | |||
647 | ||||
648 | void Profile(llvm::FoldingSetNodeID &ID) { | |||
649 | Profile(ID, TemplateArguments->asArray(), getFunction()->getASTContext()); | |||
650 | } | |||
651 | ||||
652 | static void | |||
653 | Profile(llvm::FoldingSetNodeID &ID, ArrayRef<TemplateArgument> TemplateArgs, | |||
654 | ASTContext &Context) { | |||
655 | ID.AddInteger(TemplateArgs.size()); | |||
656 | for (const TemplateArgument &TemplateArg : TemplateArgs) | |||
657 | TemplateArg.Profile(ID, Context); | |||
658 | } | |||
659 | }; | |||
660 | ||||
661 | /// Provides information a specialization of a member of a class | |||
662 | /// template, which may be a member function, static data member, | |||
663 | /// member class or member enumeration. | |||
664 | class MemberSpecializationInfo { | |||
665 | // The member declaration from which this member was instantiated, and the | |||
666 | // manner in which the instantiation occurred (in the lower two bits). | |||
667 | llvm::PointerIntPair<NamedDecl *, 2> MemberAndTSK; | |||
668 | ||||
669 | // The point at which this member was first instantiated. | |||
670 | SourceLocation PointOfInstantiation; | |||
671 | ||||
672 | public: | |||
673 | explicit | |||
674 | MemberSpecializationInfo(NamedDecl *IF, TemplateSpecializationKind TSK, | |||
675 | SourceLocation POI = SourceLocation()) | |||
676 | : MemberAndTSK(IF, TSK - 1), PointOfInstantiation(POI) { | |||
677 | assert(TSK != TSK_Undeclared &&((TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 678, __PRETTY_FUNCTION__)) | |||
678 | "Cannot encode undeclared template specializations for members")((TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 678, __PRETTY_FUNCTION__)); | |||
679 | } | |||
680 | ||||
681 | /// Retrieve the member declaration from which this member was | |||
682 | /// instantiated. | |||
683 | NamedDecl *getInstantiatedFrom() const { return MemberAndTSK.getPointer(); } | |||
684 | ||||
685 | /// Determine what kind of template specialization this is. | |||
686 | TemplateSpecializationKind getTemplateSpecializationKind() const { | |||
687 | return (TemplateSpecializationKind)(MemberAndTSK.getInt() + 1); | |||
688 | } | |||
689 | ||||
690 | bool isExplicitSpecialization() const { | |||
691 | return getTemplateSpecializationKind() == TSK_ExplicitSpecialization; | |||
692 | } | |||
693 | ||||
694 | /// Set the template specialization kind. | |||
695 | void setTemplateSpecializationKind(TemplateSpecializationKind TSK) { | |||
696 | assert(TSK != TSK_Undeclared &&((TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 697, __PRETTY_FUNCTION__)) | |||
697 | "Cannot encode undeclared template specializations for members")((TSK != TSK_Undeclared && "Cannot encode undeclared template specializations for members" ) ? static_cast<void> (0) : __assert_fail ("TSK != TSK_Undeclared && \"Cannot encode undeclared template specializations for members\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 697, __PRETTY_FUNCTION__)); | |||
698 | MemberAndTSK.setInt(TSK - 1); | |||
699 | } | |||
700 | ||||
701 | /// Retrieve the first point of instantiation of this member. | |||
702 | /// If the point of instantiation is an invalid location, then this member | |||
703 | /// has not yet been instantiated. | |||
704 | SourceLocation getPointOfInstantiation() const { | |||
705 | return PointOfInstantiation; | |||
706 | } | |||
707 | ||||
708 | /// Set the first point of instantiation. | |||
709 | void setPointOfInstantiation(SourceLocation POI) { | |||
710 | PointOfInstantiation = POI; | |||
711 | } | |||
712 | }; | |||
713 | ||||
714 | /// Provides information about a dependent function-template | |||
715 | /// specialization declaration. | |||
716 | /// | |||
717 | /// Since explicit function template specialization and instantiation | |||
718 | /// declarations can only appear in namespace scope, and you can only | |||
719 | /// specialize a member of a fully-specialized class, the only way to | |||
720 | /// get one of these is in a friend declaration like the following: | |||
721 | /// | |||
722 | /// \code | |||
723 | /// template \<class T> void foo(T); | |||
724 | /// template \<class T> class A { | |||
725 | /// friend void foo<>(T); | |||
726 | /// }; | |||
727 | /// \endcode | |||
728 | class DependentFunctionTemplateSpecializationInfo final | |||
729 | : private llvm::TrailingObjects<DependentFunctionTemplateSpecializationInfo, | |||
730 | TemplateArgumentLoc, | |||
731 | FunctionTemplateDecl *> { | |||
732 | /// The number of potential template candidates. | |||
733 | unsigned NumTemplates; | |||
734 | ||||
735 | /// The number of template arguments. | |||
736 | unsigned NumArgs; | |||
737 | ||||
738 | /// The locations of the left and right angle brackets. | |||
739 | SourceRange AngleLocs; | |||
740 | ||||
741 | size_t numTrailingObjects(OverloadToken<TemplateArgumentLoc>) const { | |||
742 | return NumArgs; | |||
743 | } | |||
744 | size_t numTrailingObjects(OverloadToken<FunctionTemplateDecl *>) const { | |||
745 | return NumTemplates; | |||
746 | } | |||
747 | ||||
748 | DependentFunctionTemplateSpecializationInfo( | |||
749 | const UnresolvedSetImpl &Templates, | |||
750 | const TemplateArgumentListInfo &TemplateArgs); | |||
751 | ||||
752 | public: | |||
753 | friend TrailingObjects; | |||
754 | ||||
755 | static DependentFunctionTemplateSpecializationInfo * | |||
756 | Create(ASTContext &Context, const UnresolvedSetImpl &Templates, | |||
757 | const TemplateArgumentListInfo &TemplateArgs); | |||
758 | ||||
759 | /// Returns the number of function templates that this might | |||
760 | /// be a specialization of. | |||
761 | unsigned getNumTemplates() const { return NumTemplates; } | |||
762 | ||||
763 | /// Returns the i'th template candidate. | |||
764 | FunctionTemplateDecl *getTemplate(unsigned I) const { | |||
765 | assert(I < getNumTemplates() && "template index out of range")((I < getNumTemplates() && "template index out of range" ) ? static_cast<void> (0) : __assert_fail ("I < getNumTemplates() && \"template index out of range\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 765, __PRETTY_FUNCTION__)); | |||
766 | return getTrailingObjects<FunctionTemplateDecl *>()[I]; | |||
767 | } | |||
768 | ||||
769 | /// Returns the explicit template arguments that were given. | |||
770 | const TemplateArgumentLoc *getTemplateArgs() const { | |||
771 | return getTrailingObjects<TemplateArgumentLoc>(); | |||
772 | } | |||
773 | ||||
774 | /// Returns the number of explicit template arguments that were given. | |||
775 | unsigned getNumTemplateArgs() const { return NumArgs; } | |||
776 | ||||
777 | /// Returns the nth template argument. | |||
778 | const TemplateArgumentLoc &getTemplateArg(unsigned I) const { | |||
779 | assert(I < getNumTemplateArgs() && "template arg index out of range")((I < getNumTemplateArgs() && "template arg index out of range" ) ? static_cast<void> (0) : __assert_fail ("I < getNumTemplateArgs() && \"template arg index out of range\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 779, __PRETTY_FUNCTION__)); | |||
780 | return getTemplateArgs()[I]; | |||
781 | } | |||
782 | ||||
783 | SourceLocation getLAngleLoc() const { | |||
784 | return AngleLocs.getBegin(); | |||
785 | } | |||
786 | ||||
787 | SourceLocation getRAngleLoc() const { | |||
788 | return AngleLocs.getEnd(); | |||
789 | } | |||
790 | }; | |||
791 | ||||
792 | /// Declaration of a redeclarable template. | |||
793 | class RedeclarableTemplateDecl : public TemplateDecl, | |||
794 | public Redeclarable<RedeclarableTemplateDecl> | |||
795 | { | |||
796 | using redeclarable_base = Redeclarable<RedeclarableTemplateDecl>; | |||
797 | ||||
798 | RedeclarableTemplateDecl *getNextRedeclarationImpl() override { | |||
799 | return getNextRedeclaration(); | |||
800 | } | |||
801 | ||||
802 | RedeclarableTemplateDecl *getPreviousDeclImpl() override { | |||
803 | return getPreviousDecl(); | |||
804 | } | |||
805 | ||||
806 | RedeclarableTemplateDecl *getMostRecentDeclImpl() override { | |||
807 | return getMostRecentDecl(); | |||
808 | } | |||
809 | ||||
810 | void anchor() override; | |||
811 | protected: | |||
812 | template <typename EntryType> struct SpecEntryTraits { | |||
813 | using DeclType = EntryType; | |||
814 | ||||
815 | static DeclType *getDecl(EntryType *D) { | |||
816 | return D; | |||
817 | } | |||
818 | ||||
819 | static ArrayRef<TemplateArgument> getTemplateArgs(EntryType *D) { | |||
820 | return D->getTemplateArgs().asArray(); | |||
821 | } | |||
822 | }; | |||
823 | ||||
824 | template <typename EntryType, typename SETraits = SpecEntryTraits<EntryType>, | |||
825 | typename DeclType = typename SETraits::DeclType> | |||
826 | struct SpecIterator | |||
827 | : llvm::iterator_adaptor_base< | |||
828 | SpecIterator<EntryType, SETraits, DeclType>, | |||
829 | typename llvm::FoldingSetVector<EntryType>::iterator, | |||
830 | typename std::iterator_traits<typename llvm::FoldingSetVector< | |||
831 | EntryType>::iterator>::iterator_category, | |||
832 | DeclType *, ptrdiff_t, DeclType *, DeclType *> { | |||
833 | SpecIterator() = default; | |||
834 | explicit SpecIterator( | |||
835 | typename llvm::FoldingSetVector<EntryType>::iterator SetIter) | |||
836 | : SpecIterator::iterator_adaptor_base(std::move(SetIter)) {} | |||
837 | ||||
838 | DeclType *operator*() const { | |||
839 | return SETraits::getDecl(&*this->I)->getMostRecentDecl(); | |||
840 | } | |||
841 | ||||
842 | DeclType *operator->() const { return **this; } | |||
843 | }; | |||
844 | ||||
845 | template <typename EntryType> | |||
846 | static SpecIterator<EntryType> | |||
847 | makeSpecIterator(llvm::FoldingSetVector<EntryType> &Specs, bool isEnd) { | |||
848 | return SpecIterator<EntryType>(isEnd ? Specs.end() : Specs.begin()); | |||
849 | } | |||
850 | ||||
851 | void loadLazySpecializationsImpl() const; | |||
852 | ||||
853 | template <class EntryType> typename SpecEntryTraits<EntryType>::DeclType* | |||
854 | findSpecializationImpl(llvm::FoldingSetVector<EntryType> &Specs, | |||
855 | ArrayRef<TemplateArgument> Args, void *&InsertPos); | |||
856 | ||||
857 | template <class Derived, class EntryType> | |||
858 | void addSpecializationImpl(llvm::FoldingSetVector<EntryType> &Specs, | |||
859 | EntryType *Entry, void *InsertPos); | |||
860 | ||||
861 | struct CommonBase { | |||
862 | CommonBase() : InstantiatedFromMember(nullptr, false) {} | |||
863 | ||||
864 | /// The template from which this was most | |||
865 | /// directly instantiated (or null). | |||
866 | /// | |||
867 | /// The boolean value indicates whether this template | |||
868 | /// was explicitly specialized. | |||
869 | llvm::PointerIntPair<RedeclarableTemplateDecl*, 1, bool> | |||
870 | InstantiatedFromMember; | |||
871 | ||||
872 | /// If non-null, points to an array of specializations (including | |||
873 | /// partial specializations) known only by their external declaration IDs. | |||
874 | /// | |||
875 | /// The first value in the array is the number of specializations/partial | |||
876 | /// specializations that follow. | |||
877 | uint32_t *LazySpecializations = nullptr; | |||
878 | }; | |||
879 | ||||
880 | /// Pointer to the common data shared by all declarations of this | |||
881 | /// template. | |||
882 | mutable CommonBase *Common = nullptr; | |||
883 | ||||
884 | /// Retrieves the "common" pointer shared by all (re-)declarations of | |||
885 | /// the same template. Calling this routine may implicitly allocate memory | |||
886 | /// for the common pointer. | |||
887 | CommonBase *getCommonPtr() const; | |||
888 | ||||
889 | virtual CommonBase *newCommon(ASTContext &C) const = 0; | |||
890 | ||||
891 | // Construct a template decl with name, parameters, and templated element. | |||
892 | RedeclarableTemplateDecl(ConstrainedTemplateDeclInfo *CTDI, Kind DK, | |||
893 | ASTContext &C, DeclContext *DC, SourceLocation L, | |||
894 | DeclarationName Name, TemplateParameterList *Params, | |||
895 | NamedDecl *Decl) | |||
896 | : TemplateDecl(CTDI, DK, DC, L, Name, Params, Decl), redeclarable_base(C) | |||
897 | {} | |||
898 | ||||
899 | RedeclarableTemplateDecl(Kind DK, ASTContext &C, DeclContext *DC, | |||
900 | SourceLocation L, DeclarationName Name, | |||
901 | TemplateParameterList *Params, NamedDecl *Decl) | |||
902 | : RedeclarableTemplateDecl(nullptr, DK, C, DC, L, Name, Params, Decl) {} | |||
903 | ||||
904 | public: | |||
905 | friend class ASTDeclReader; | |||
906 | friend class ASTDeclWriter; | |||
907 | friend class ASTReader; | |||
908 | template <class decl_type> friend class RedeclarableTemplate; | |||
909 | ||||
910 | /// Retrieves the canonical declaration of this template. | |||
911 | RedeclarableTemplateDecl *getCanonicalDecl() override { | |||
912 | return getFirstDecl(); | |||
913 | } | |||
914 | const RedeclarableTemplateDecl *getCanonicalDecl() const { | |||
915 | return getFirstDecl(); | |||
916 | } | |||
917 | ||||
918 | /// Determines whether this template was a specialization of a | |||
919 | /// member template. | |||
920 | /// | |||
921 | /// In the following example, the function template \c X<int>::f and the | |||
922 | /// member template \c X<int>::Inner are member specializations. | |||
923 | /// | |||
924 | /// \code | |||
925 | /// template<typename T> | |||
926 | /// struct X { | |||
927 | /// template<typename U> void f(T, U); | |||
928 | /// template<typename U> struct Inner; | |||
929 | /// }; | |||
930 | /// | |||
931 | /// template<> template<typename T> | |||
932 | /// void X<int>::f(int, T); | |||
933 | /// template<> template<typename T> | |||
934 | /// struct X<int>::Inner { /* ... */ }; | |||
935 | /// \endcode | |||
936 | bool isMemberSpecialization() const { | |||
937 | return getCommonPtr()->InstantiatedFromMember.getInt(); | |||
938 | } | |||
939 | ||||
940 | /// Note that this member template is a specialization. | |||
941 | void setMemberSpecialization() { | |||
942 | assert(getCommonPtr()->InstantiatedFromMember.getPointer() &&((getCommonPtr()->InstantiatedFromMember.getPointer() && "Only member templates can be member template specializations" ) ? static_cast<void> (0) : __assert_fail ("getCommonPtr()->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 943, __PRETTY_FUNCTION__)) | |||
943 | "Only member templates can be member template specializations")((getCommonPtr()->InstantiatedFromMember.getPointer() && "Only member templates can be member template specializations" ) ? static_cast<void> (0) : __assert_fail ("getCommonPtr()->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 943, __PRETTY_FUNCTION__)); | |||
944 | getCommonPtr()->InstantiatedFromMember.setInt(true); | |||
945 | } | |||
946 | ||||
947 | /// Retrieve the member template from which this template was | |||
948 | /// instantiated, or nullptr if this template was not instantiated from a | |||
949 | /// member template. | |||
950 | /// | |||
951 | /// A template is instantiated from a member template when the member | |||
952 | /// template itself is part of a class template (or member thereof). For | |||
953 | /// example, given | |||
954 | /// | |||
955 | /// \code | |||
956 | /// template<typename T> | |||
957 | /// struct X { | |||
958 | /// template<typename U> void f(T, U); | |||
959 | /// }; | |||
960 | /// | |||
961 | /// void test(X<int> x) { | |||
962 | /// x.f(1, 'a'); | |||
963 | /// }; | |||
964 | /// \endcode | |||
965 | /// | |||
966 | /// \c X<int>::f is a FunctionTemplateDecl that describes the function | |||
967 | /// template | |||
968 | /// | |||
969 | /// \code | |||
970 | /// template<typename U> void X<int>::f(int, U); | |||
971 | /// \endcode | |||
972 | /// | |||
973 | /// which was itself created during the instantiation of \c X<int>. Calling | |||
974 | /// getInstantiatedFromMemberTemplate() on this FunctionTemplateDecl will | |||
975 | /// retrieve the FunctionTemplateDecl for the original template \c f within | |||
976 | /// the class template \c X<T>, i.e., | |||
977 | /// | |||
978 | /// \code | |||
979 | /// template<typename T> | |||
980 | /// template<typename U> | |||
981 | /// void X<T>::f(T, U); | |||
982 | /// \endcode | |||
983 | RedeclarableTemplateDecl *getInstantiatedFromMemberTemplate() const { | |||
984 | return getCommonPtr()->InstantiatedFromMember.getPointer(); | |||
985 | } | |||
986 | ||||
987 | void setInstantiatedFromMemberTemplate(RedeclarableTemplateDecl *TD) { | |||
988 | assert(!getCommonPtr()->InstantiatedFromMember.getPointer())((!getCommonPtr()->InstantiatedFromMember.getPointer()) ? static_cast <void> (0) : __assert_fail ("!getCommonPtr()->InstantiatedFromMember.getPointer()" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 988, __PRETTY_FUNCTION__)); | |||
989 | getCommonPtr()->InstantiatedFromMember.setPointer(TD); | |||
990 | } | |||
991 | ||||
992 | using redecl_range = redeclarable_base::redecl_range; | |||
993 | using redecl_iterator = redeclarable_base::redecl_iterator; | |||
994 | ||||
995 | using redeclarable_base::redecls_begin; | |||
996 | using redeclarable_base::redecls_end; | |||
997 | using redeclarable_base::redecls; | |||
998 | using redeclarable_base::getPreviousDecl; | |||
999 | using redeclarable_base::getMostRecentDecl; | |||
1000 | using redeclarable_base::isFirstDecl; | |||
1001 | ||||
1002 | // Implement isa/cast/dyncast/etc. | |||
1003 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
1004 | ||||
1005 | static bool classofKind(Kind K) { | |||
1006 | return K >= firstRedeclarableTemplate && K <= lastRedeclarableTemplate; | |||
1007 | } | |||
1008 | }; | |||
1009 | ||||
1010 | template <> struct RedeclarableTemplateDecl:: | |||
1011 | SpecEntryTraits<FunctionTemplateSpecializationInfo> { | |||
1012 | using DeclType = FunctionDecl; | |||
1013 | ||||
1014 | static DeclType *getDecl(FunctionTemplateSpecializationInfo *I) { | |||
1015 | return I->getFunction(); | |||
1016 | } | |||
1017 | ||||
1018 | static ArrayRef<TemplateArgument> | |||
1019 | getTemplateArgs(FunctionTemplateSpecializationInfo *I) { | |||
1020 | return I->TemplateArguments->asArray(); | |||
1021 | } | |||
1022 | }; | |||
1023 | ||||
1024 | /// Declaration of a template function. | |||
1025 | class FunctionTemplateDecl : public RedeclarableTemplateDecl { | |||
1026 | protected: | |||
1027 | friend class FunctionDecl; | |||
1028 | ||||
1029 | /// Data that is common to all of the declarations of a given | |||
1030 | /// function template. | |||
1031 | struct Common : CommonBase { | |||
1032 | /// The function template specializations for this function | |||
1033 | /// template, including explicit specializations and instantiations. | |||
1034 | llvm::FoldingSetVector<FunctionTemplateSpecializationInfo> Specializations; | |||
1035 | ||||
1036 | /// The set of "injected" template arguments used within this | |||
1037 | /// function template. | |||
1038 | /// | |||
1039 | /// This pointer refers to the template arguments (there are as | |||
1040 | /// many template arguments as template parameaters) for the function | |||
1041 | /// template, and is allocated lazily, since most function templates do not | |||
1042 | /// require the use of this information. | |||
1043 | TemplateArgument *InjectedArgs = nullptr; | |||
1044 | ||||
1045 | Common() = default; | |||
1046 | }; | |||
1047 | ||||
1048 | FunctionTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L, | |||
1049 | DeclarationName Name, TemplateParameterList *Params, | |||
1050 | NamedDecl *Decl) | |||
1051 | : RedeclarableTemplateDecl(FunctionTemplate, C, DC, L, Name, Params, | |||
1052 | Decl) {} | |||
1053 | ||||
1054 | CommonBase *newCommon(ASTContext &C) const override; | |||
1055 | ||||
1056 | Common *getCommonPtr() const { | |||
1057 | return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr()); | |||
1058 | } | |||
1059 | ||||
1060 | /// Retrieve the set of function template specializations of this | |||
1061 | /// function template. | |||
1062 | llvm::FoldingSetVector<FunctionTemplateSpecializationInfo> & | |||
1063 | getSpecializations() const; | |||
1064 | ||||
1065 | /// Add a specialization of this function template. | |||
1066 | /// | |||
1067 | /// \param InsertPos Insert position in the FoldingSetVector, must have been | |||
1068 | /// retrieved by an earlier call to findSpecialization(). | |||
1069 | void addSpecialization(FunctionTemplateSpecializationInfo* Info, | |||
1070 | void *InsertPos); | |||
1071 | ||||
1072 | public: | |||
1073 | friend class ASTDeclReader; | |||
1074 | friend class ASTDeclWriter; | |||
1075 | ||||
1076 | /// Load any lazily-loaded specializations from the external source. | |||
1077 | void LoadLazySpecializations() const; | |||
1078 | ||||
1079 | /// Get the underlying function declaration of the template. | |||
1080 | FunctionDecl *getTemplatedDecl() const { | |||
1081 | return static_cast<FunctionDecl *>(TemplatedDecl); | |||
1082 | } | |||
1083 | ||||
1084 | /// Returns whether this template declaration defines the primary | |||
1085 | /// pattern. | |||
1086 | bool isThisDeclarationADefinition() const { | |||
1087 | return getTemplatedDecl()->isThisDeclarationADefinition(); | |||
1088 | } | |||
1089 | ||||
1090 | /// Return the specialization with the provided arguments if it exists, | |||
1091 | /// otherwise return the insertion point. | |||
1092 | FunctionDecl *findSpecialization(ArrayRef<TemplateArgument> Args, | |||
1093 | void *&InsertPos); | |||
1094 | ||||
1095 | FunctionTemplateDecl *getCanonicalDecl() override { | |||
1096 | return cast<FunctionTemplateDecl>( | |||
1097 | RedeclarableTemplateDecl::getCanonicalDecl()); | |||
1098 | } | |||
1099 | const FunctionTemplateDecl *getCanonicalDecl() const { | |||
1100 | return cast<FunctionTemplateDecl>( | |||
1101 | RedeclarableTemplateDecl::getCanonicalDecl()); | |||
1102 | } | |||
1103 | ||||
1104 | /// Retrieve the previous declaration of this function template, or | |||
1105 | /// nullptr if no such declaration exists. | |||
1106 | FunctionTemplateDecl *getPreviousDecl() { | |||
1107 | return cast_or_null<FunctionTemplateDecl>( | |||
1108 | static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl()); | |||
1109 | } | |||
1110 | const FunctionTemplateDecl *getPreviousDecl() const { | |||
1111 | return cast_or_null<FunctionTemplateDecl>( | |||
1112 | static_cast<const RedeclarableTemplateDecl *>(this)->getPreviousDecl()); | |||
1113 | } | |||
1114 | ||||
1115 | FunctionTemplateDecl *getMostRecentDecl() { | |||
1116 | return cast<FunctionTemplateDecl>( | |||
1117 | static_cast<RedeclarableTemplateDecl *>(this) | |||
1118 | ->getMostRecentDecl()); | |||
1119 | } | |||
1120 | const FunctionTemplateDecl *getMostRecentDecl() const { | |||
1121 | return const_cast<FunctionTemplateDecl*>(this)->getMostRecentDecl(); | |||
1122 | } | |||
1123 | ||||
1124 | FunctionTemplateDecl *getInstantiatedFromMemberTemplate() const { | |||
1125 | return cast_or_null<FunctionTemplateDecl>( | |||
1126 | RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate()); | |||
1127 | } | |||
1128 | ||||
1129 | using spec_iterator = SpecIterator<FunctionTemplateSpecializationInfo>; | |||
1130 | using spec_range = llvm::iterator_range<spec_iterator>; | |||
1131 | ||||
1132 | spec_range specializations() const { | |||
1133 | return spec_range(spec_begin(), spec_end()); | |||
1134 | } | |||
1135 | ||||
1136 | spec_iterator spec_begin() const { | |||
1137 | return makeSpecIterator(getSpecializations(), false); | |||
1138 | } | |||
1139 | ||||
1140 | spec_iterator spec_end() const { | |||
1141 | return makeSpecIterator(getSpecializations(), true); | |||
1142 | } | |||
1143 | ||||
1144 | /// Retrieve the "injected" template arguments that correspond to the | |||
1145 | /// template parameters of this function template. | |||
1146 | /// | |||
1147 | /// Although the C++ standard has no notion of the "injected" template | |||
1148 | /// arguments for a function template, the notion is convenient when | |||
1149 | /// we need to perform substitutions inside the definition of a function | |||
1150 | /// template. | |||
1151 | ArrayRef<TemplateArgument> getInjectedTemplateArgs(); | |||
1152 | ||||
1153 | /// Merge \p Prev with our RedeclarableTemplateDecl::Common. | |||
1154 | void mergePrevDecl(FunctionTemplateDecl *Prev); | |||
1155 | ||||
1156 | /// Create a function template node. | |||
1157 | static FunctionTemplateDecl *Create(ASTContext &C, DeclContext *DC, | |||
1158 | SourceLocation L, | |||
1159 | DeclarationName Name, | |||
1160 | TemplateParameterList *Params, | |||
1161 | NamedDecl *Decl); | |||
1162 | ||||
1163 | /// Create an empty function template node. | |||
1164 | static FunctionTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID); | |||
1165 | ||||
1166 | // Implement isa/cast/dyncast support | |||
1167 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
1168 | static bool classofKind(Kind K) { return K == FunctionTemplate; } | |||
1169 | }; | |||
1170 | ||||
1171 | //===----------------------------------------------------------------------===// | |||
1172 | // Kinds of Template Parameters | |||
1173 | //===----------------------------------------------------------------------===// | |||
1174 | ||||
1175 | /// Defines the position of a template parameter within a template | |||
1176 | /// parameter list. | |||
1177 | /// | |||
1178 | /// Because template parameter can be listed | |||
1179 | /// sequentially for out-of-line template members, each template parameter is | |||
1180 | /// given a Depth - the nesting of template parameter scopes - and a Position - | |||
1181 | /// the occurrence within the parameter list. | |||
1182 | /// This class is inheritedly privately by different kinds of template | |||
1183 | /// parameters and is not part of the Decl hierarchy. Just a facility. | |||
1184 | class TemplateParmPosition { | |||
1185 | protected: | |||
1186 | // FIXME: These probably don't need to be ints. int:5 for depth, int:8 for | |||
1187 | // position? Maybe? | |||
1188 | unsigned Depth; | |||
1189 | unsigned Position; | |||
1190 | ||||
1191 | TemplateParmPosition(unsigned D, unsigned P) : Depth(D), Position(P) {} | |||
1192 | ||||
1193 | public: | |||
1194 | TemplateParmPosition() = delete; | |||
1195 | ||||
1196 | /// Get the nesting depth of the template parameter. | |||
1197 | unsigned getDepth() const { return Depth; } | |||
1198 | void setDepth(unsigned D) { Depth = D; } | |||
1199 | ||||
1200 | /// Get the position of the template parameter within its parameter list. | |||
1201 | unsigned getPosition() const { return Position; } | |||
1202 | void setPosition(unsigned P) { Position = P; } | |||
1203 | ||||
1204 | /// Get the index of the template parameter within its parameter list. | |||
1205 | unsigned getIndex() const { return Position; } | |||
1206 | }; | |||
1207 | ||||
1208 | /// Declaration of a template type parameter. | |||
1209 | /// | |||
1210 | /// For example, "T" in | |||
1211 | /// \code | |||
1212 | /// template<typename T> class vector; | |||
1213 | /// \endcode | |||
1214 | class TemplateTypeParmDecl : public TypeDecl { | |||
1215 | /// Sema creates these on the stack during auto type deduction. | |||
1216 | friend class Sema; | |||
1217 | ||||
1218 | /// Whether this template type parameter was declaration with | |||
1219 | /// the 'typename' keyword. | |||
1220 | /// | |||
1221 | /// If false, it was declared with the 'class' keyword. | |||
1222 | bool Typename : 1; | |||
1223 | ||||
1224 | /// The default template argument, if any. | |||
1225 | using DefArgStorage = | |||
1226 | DefaultArgStorage<TemplateTypeParmDecl, TypeSourceInfo *>; | |||
1227 | DefArgStorage DefaultArgument; | |||
1228 | ||||
1229 | TemplateTypeParmDecl(DeclContext *DC, SourceLocation KeyLoc, | |||
1230 | SourceLocation IdLoc, IdentifierInfo *Id, | |||
1231 | bool Typename) | |||
1232 | : TypeDecl(TemplateTypeParm, DC, IdLoc, Id, KeyLoc), Typename(Typename) {} | |||
1233 | ||||
1234 | public: | |||
1235 | static TemplateTypeParmDecl *Create(const ASTContext &C, DeclContext *DC, | |||
1236 | SourceLocation KeyLoc, | |||
1237 | SourceLocation NameLoc, | |||
1238 | unsigned D, unsigned P, | |||
1239 | IdentifierInfo *Id, bool Typename, | |||
1240 | bool ParameterPack); | |||
1241 | static TemplateTypeParmDecl *CreateDeserialized(const ASTContext &C, | |||
1242 | unsigned ID); | |||
1243 | ||||
1244 | /// Whether this template type parameter was declared with | |||
1245 | /// the 'typename' keyword. | |||
1246 | /// | |||
1247 | /// If not, it was declared with the 'class' keyword. | |||
1248 | bool wasDeclaredWithTypename() const { return Typename; } | |||
1249 | ||||
1250 | const DefArgStorage &getDefaultArgStorage() const { return DefaultArgument; } | |||
1251 | ||||
1252 | /// Determine whether this template parameter has a default | |||
1253 | /// argument. | |||
1254 | bool hasDefaultArgument() const { return DefaultArgument.isSet(); } | |||
1255 | ||||
1256 | /// Retrieve the default argument, if any. | |||
1257 | QualType getDefaultArgument() const { | |||
1258 | return DefaultArgument.get()->getType(); | |||
1259 | } | |||
1260 | ||||
1261 | /// Retrieves the default argument's source information, if any. | |||
1262 | TypeSourceInfo *getDefaultArgumentInfo() const { | |||
1263 | return DefaultArgument.get(); | |||
1264 | } | |||
1265 | ||||
1266 | /// Retrieves the location of the default argument declaration. | |||
1267 | SourceLocation getDefaultArgumentLoc() const; | |||
1268 | ||||
1269 | /// Determines whether the default argument was inherited | |||
1270 | /// from a previous declaration of this template. | |||
1271 | bool defaultArgumentWasInherited() const { | |||
1272 | return DefaultArgument.isInherited(); | |||
1273 | } | |||
1274 | ||||
1275 | /// Set the default argument for this template parameter. | |||
1276 | void setDefaultArgument(TypeSourceInfo *DefArg) { | |||
1277 | DefaultArgument.set(DefArg); | |||
1278 | } | |||
1279 | ||||
1280 | /// Set that this default argument was inherited from another | |||
1281 | /// parameter. | |||
1282 | void setInheritedDefaultArgument(const ASTContext &C, | |||
1283 | TemplateTypeParmDecl *Prev) { | |||
1284 | DefaultArgument.setInherited(C, Prev); | |||
1285 | } | |||
1286 | ||||
1287 | /// Removes the default argument of this template parameter. | |||
1288 | void removeDefaultArgument() { | |||
1289 | DefaultArgument.clear(); | |||
1290 | } | |||
1291 | ||||
1292 | /// Set whether this template type parameter was declared with | |||
1293 | /// the 'typename' or 'class' keyword. | |||
1294 | void setDeclaredWithTypename(bool withTypename) { Typename = withTypename; } | |||
1295 | ||||
1296 | /// Retrieve the depth of the template parameter. | |||
1297 | unsigned getDepth() const; | |||
1298 | ||||
1299 | /// Retrieve the index of the template parameter. | |||
1300 | unsigned getIndex() const; | |||
1301 | ||||
1302 | /// Returns whether this is a parameter pack. | |||
1303 | bool isParameterPack() const; | |||
1304 | ||||
1305 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); | |||
1306 | ||||
1307 | // Implement isa/cast/dyncast/etc. | |||
1308 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
1309 | static bool classofKind(Kind K) { return K == TemplateTypeParm; } | |||
1310 | }; | |||
1311 | ||||
1312 | /// NonTypeTemplateParmDecl - Declares a non-type template parameter, | |||
1313 | /// e.g., "Size" in | |||
1314 | /// @code | |||
1315 | /// template<int Size> class array { }; | |||
1316 | /// @endcode | |||
1317 | class NonTypeTemplateParmDecl final | |||
1318 | : public DeclaratorDecl, | |||
1319 | protected TemplateParmPosition, | |||
1320 | private llvm::TrailingObjects<NonTypeTemplateParmDecl, | |||
1321 | std::pair<QualType, TypeSourceInfo *>> { | |||
1322 | friend class ASTDeclReader; | |||
1323 | friend TrailingObjects; | |||
1324 | ||||
1325 | /// The default template argument, if any, and whether or not | |||
1326 | /// it was inherited. | |||
1327 | using DefArgStorage = DefaultArgStorage<NonTypeTemplateParmDecl, Expr *>; | |||
1328 | DefArgStorage DefaultArgument; | |||
1329 | ||||
1330 | // FIXME: Collapse this into TemplateParamPosition; or, just move depth/index | |||
1331 | // down here to save memory. | |||
1332 | ||||
1333 | /// Whether this non-type template parameter is a parameter pack. | |||
1334 | bool ParameterPack; | |||
1335 | ||||
1336 | /// Whether this non-type template parameter is an "expanded" | |||
1337 | /// parameter pack, meaning that its type is a pack expansion and we | |||
1338 | /// already know the set of types that expansion expands to. | |||
1339 | bool ExpandedParameterPack = false; | |||
1340 | ||||
1341 | /// The number of types in an expanded parameter pack. | |||
1342 | unsigned NumExpandedTypes = 0; | |||
1343 | ||||
1344 | size_t numTrailingObjects( | |||
1345 | OverloadToken<std::pair<QualType, TypeSourceInfo *>>) const { | |||
1346 | return NumExpandedTypes; | |||
1347 | } | |||
1348 | ||||
1349 | NonTypeTemplateParmDecl(DeclContext *DC, SourceLocation StartLoc, | |||
1350 | SourceLocation IdLoc, unsigned D, unsigned P, | |||
1351 | IdentifierInfo *Id, QualType T, | |||
1352 | bool ParameterPack, TypeSourceInfo *TInfo) | |||
1353 | : DeclaratorDecl(NonTypeTemplateParm, DC, IdLoc, Id, T, TInfo, StartLoc), | |||
1354 | TemplateParmPosition(D, P), ParameterPack(ParameterPack) {} | |||
1355 | ||||
1356 | NonTypeTemplateParmDecl(DeclContext *DC, SourceLocation StartLoc, | |||
1357 | SourceLocation IdLoc, unsigned D, unsigned P, | |||
1358 | IdentifierInfo *Id, QualType T, | |||
1359 | TypeSourceInfo *TInfo, | |||
1360 | ArrayRef<QualType> ExpandedTypes, | |||
1361 | ArrayRef<TypeSourceInfo *> ExpandedTInfos); | |||
1362 | ||||
1363 | public: | |||
1364 | static NonTypeTemplateParmDecl * | |||
1365 | Create(const ASTContext &C, DeclContext *DC, SourceLocation StartLoc, | |||
1366 | SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id, | |||
1367 | QualType T, bool ParameterPack, TypeSourceInfo *TInfo); | |||
1368 | ||||
1369 | static NonTypeTemplateParmDecl * | |||
1370 | Create(const ASTContext &C, DeclContext *DC, SourceLocation StartLoc, | |||
1371 | SourceLocation IdLoc, unsigned D, unsigned P, IdentifierInfo *Id, | |||
1372 | QualType T, TypeSourceInfo *TInfo, ArrayRef<QualType> ExpandedTypes, | |||
1373 | ArrayRef<TypeSourceInfo *> ExpandedTInfos); | |||
1374 | ||||
1375 | static NonTypeTemplateParmDecl *CreateDeserialized(ASTContext &C, | |||
1376 | unsigned ID); | |||
1377 | static NonTypeTemplateParmDecl *CreateDeserialized(ASTContext &C, | |||
1378 | unsigned ID, | |||
1379 | unsigned NumExpandedTypes); | |||
1380 | ||||
1381 | using TemplateParmPosition::getDepth; | |||
1382 | using TemplateParmPosition::setDepth; | |||
1383 | using TemplateParmPosition::getPosition; | |||
1384 | using TemplateParmPosition::setPosition; | |||
1385 | using TemplateParmPosition::getIndex; | |||
1386 | ||||
1387 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); | |||
1388 | ||||
1389 | const DefArgStorage &getDefaultArgStorage() const { return DefaultArgument; } | |||
1390 | ||||
1391 | /// Determine whether this template parameter has a default | |||
1392 | /// argument. | |||
1393 | bool hasDefaultArgument() const { return DefaultArgument.isSet(); } | |||
1394 | ||||
1395 | /// Retrieve the default argument, if any. | |||
1396 | Expr *getDefaultArgument() const { return DefaultArgument.get(); } | |||
1397 | ||||
1398 | /// Retrieve the location of the default argument, if any. | |||
1399 | SourceLocation getDefaultArgumentLoc() const; | |||
1400 | ||||
1401 | /// Determines whether the default argument was inherited | |||
1402 | /// from a previous declaration of this template. | |||
1403 | bool defaultArgumentWasInherited() const { | |||
1404 | return DefaultArgument.isInherited(); | |||
1405 | } | |||
1406 | ||||
1407 | /// Set the default argument for this template parameter, and | |||
1408 | /// whether that default argument was inherited from another | |||
1409 | /// declaration. | |||
1410 | void setDefaultArgument(Expr *DefArg) { DefaultArgument.set(DefArg); } | |||
1411 | void setInheritedDefaultArgument(const ASTContext &C, | |||
1412 | NonTypeTemplateParmDecl *Parm) { | |||
1413 | DefaultArgument.setInherited(C, Parm); | |||
1414 | } | |||
1415 | ||||
1416 | /// Removes the default argument of this template parameter. | |||
1417 | void removeDefaultArgument() { DefaultArgument.clear(); } | |||
1418 | ||||
1419 | /// Whether this parameter is a non-type template parameter pack. | |||
1420 | /// | |||
1421 | /// If the parameter is a parameter pack, the type may be a | |||
1422 | /// \c PackExpansionType. In the following example, the \c Dims parameter | |||
1423 | /// is a parameter pack (whose type is 'unsigned'). | |||
1424 | /// | |||
1425 | /// \code | |||
1426 | /// template<typename T, unsigned ...Dims> struct multi_array; | |||
1427 | /// \endcode | |||
1428 | bool isParameterPack() const { return ParameterPack; } | |||
1429 | ||||
1430 | /// Whether this parameter pack is a pack expansion. | |||
1431 | /// | |||
1432 | /// A non-type template parameter pack is a pack expansion if its type | |||
1433 | /// contains an unexpanded parameter pack. In this case, we will have | |||
1434 | /// built a PackExpansionType wrapping the type. | |||
1435 | bool isPackExpansion() const { | |||
1436 | return ParameterPack && getType()->getAs<PackExpansionType>(); | |||
1437 | } | |||
1438 | ||||
1439 | /// Whether this parameter is a non-type template parameter pack | |||
1440 | /// that has a known list of different types at different positions. | |||
1441 | /// | |||
1442 | /// A parameter pack is an expanded parameter pack when the original | |||
1443 | /// parameter pack's type was itself a pack expansion, and that expansion | |||
1444 | /// has already been expanded. For example, given: | |||
1445 | /// | |||
1446 | /// \code | |||
1447 | /// template<typename ...Types> | |||
1448 | /// struct X { | |||
1449 | /// template<Types ...Values> | |||
1450 | /// struct Y { /* ... */ }; | |||
1451 | /// }; | |||
1452 | /// \endcode | |||
1453 | /// | |||
1454 | /// The parameter pack \c Values has a \c PackExpansionType as its type, | |||
1455 | /// which expands \c Types. When \c Types is supplied with template arguments | |||
1456 | /// by instantiating \c X, the instantiation of \c Values becomes an | |||
1457 | /// expanded parameter pack. For example, instantiating | |||
1458 | /// \c X<int, unsigned int> results in \c Values being an expanded parameter | |||
1459 | /// pack with expansion types \c int and \c unsigned int. | |||
1460 | /// | |||
1461 | /// The \c getExpansionType() and \c getExpansionTypeSourceInfo() functions | |||
1462 | /// return the expansion types. | |||
1463 | bool isExpandedParameterPack() const { return ExpandedParameterPack; } | |||
1464 | ||||
1465 | /// Retrieves the number of expansion types in an expanded parameter | |||
1466 | /// pack. | |||
1467 | unsigned getNumExpansionTypes() const { | |||
1468 | assert(ExpandedParameterPack && "Not an expansion parameter pack")((ExpandedParameterPack && "Not an expansion parameter pack" ) ? static_cast<void> (0) : __assert_fail ("ExpandedParameterPack && \"Not an expansion parameter pack\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1468, __PRETTY_FUNCTION__)); | |||
1469 | return NumExpandedTypes; | |||
1470 | } | |||
1471 | ||||
1472 | /// Retrieve a particular expansion type within an expanded parameter | |||
1473 | /// pack. | |||
1474 | QualType getExpansionType(unsigned I) const { | |||
1475 | assert(I < NumExpandedTypes && "Out-of-range expansion type index")((I < NumExpandedTypes && "Out-of-range expansion type index" ) ? static_cast<void> (0) : __assert_fail ("I < NumExpandedTypes && \"Out-of-range expansion type index\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1475, __PRETTY_FUNCTION__)); | |||
1476 | auto TypesAndInfos = | |||
1477 | getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>(); | |||
1478 | return TypesAndInfos[I].first; | |||
1479 | } | |||
1480 | ||||
1481 | /// Retrieve a particular expansion type source info within an | |||
1482 | /// expanded parameter pack. | |||
1483 | TypeSourceInfo *getExpansionTypeSourceInfo(unsigned I) const { | |||
1484 | assert(I < NumExpandedTypes && "Out-of-range expansion type index")((I < NumExpandedTypes && "Out-of-range expansion type index" ) ? static_cast<void> (0) : __assert_fail ("I < NumExpandedTypes && \"Out-of-range expansion type index\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1484, __PRETTY_FUNCTION__)); | |||
1485 | auto TypesAndInfos = | |||
1486 | getTrailingObjects<std::pair<QualType, TypeSourceInfo *>>(); | |||
1487 | return TypesAndInfos[I].second; | |||
1488 | } | |||
1489 | ||||
1490 | // Implement isa/cast/dyncast/etc. | |||
1491 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
1492 | static bool classofKind(Kind K) { return K == NonTypeTemplateParm; } | |||
1493 | }; | |||
1494 | ||||
1495 | /// TemplateTemplateParmDecl - Declares a template template parameter, | |||
1496 | /// e.g., "T" in | |||
1497 | /// @code | |||
1498 | /// template <template <typename> class T> class container { }; | |||
1499 | /// @endcode | |||
1500 | /// A template template parameter is a TemplateDecl because it defines the | |||
1501 | /// name of a template and the template parameters allowable for substitution. | |||
1502 | class TemplateTemplateParmDecl final | |||
1503 | : public TemplateDecl, | |||
1504 | protected TemplateParmPosition, | |||
1505 | private llvm::TrailingObjects<TemplateTemplateParmDecl, | |||
1506 | TemplateParameterList *> { | |||
1507 | /// The default template argument, if any. | |||
1508 | using DefArgStorage = | |||
1509 | DefaultArgStorage<TemplateTemplateParmDecl, TemplateArgumentLoc *>; | |||
1510 | DefArgStorage DefaultArgument; | |||
1511 | ||||
1512 | /// Whether this parameter is a parameter pack. | |||
1513 | bool ParameterPack; | |||
1514 | ||||
1515 | /// Whether this template template parameter is an "expanded" | |||
1516 | /// parameter pack, meaning that it is a pack expansion and we | |||
1517 | /// already know the set of template parameters that expansion expands to. | |||
1518 | bool ExpandedParameterPack = false; | |||
1519 | ||||
1520 | /// The number of parameters in an expanded parameter pack. | |||
1521 | unsigned NumExpandedParams = 0; | |||
1522 | ||||
1523 | TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L, | |||
1524 | unsigned D, unsigned P, bool ParameterPack, | |||
1525 | IdentifierInfo *Id, TemplateParameterList *Params) | |||
1526 | : TemplateDecl(TemplateTemplateParm, DC, L, Id, Params), | |||
1527 | TemplateParmPosition(D, P), ParameterPack(ParameterPack) {} | |||
1528 | ||||
1529 | TemplateTemplateParmDecl(DeclContext *DC, SourceLocation L, | |||
1530 | unsigned D, unsigned P, | |||
1531 | IdentifierInfo *Id, TemplateParameterList *Params, | |||
1532 | ArrayRef<TemplateParameterList *> Expansions); | |||
1533 | ||||
1534 | void anchor() override; | |||
1535 | ||||
1536 | public: | |||
1537 | friend class ASTDeclReader; | |||
1538 | friend class ASTDeclWriter; | |||
1539 | friend TrailingObjects; | |||
1540 | ||||
1541 | static TemplateTemplateParmDecl *Create(const ASTContext &C, DeclContext *DC, | |||
1542 | SourceLocation L, unsigned D, | |||
1543 | unsigned P, bool ParameterPack, | |||
1544 | IdentifierInfo *Id, | |||
1545 | TemplateParameterList *Params); | |||
1546 | static TemplateTemplateParmDecl *Create(const ASTContext &C, DeclContext *DC, | |||
1547 | SourceLocation L, unsigned D, | |||
1548 | unsigned P, | |||
1549 | IdentifierInfo *Id, | |||
1550 | TemplateParameterList *Params, | |||
1551 | ArrayRef<TemplateParameterList *> Expansions); | |||
1552 | ||||
1553 | static TemplateTemplateParmDecl *CreateDeserialized(ASTContext &C, | |||
1554 | unsigned ID); | |||
1555 | static TemplateTemplateParmDecl *CreateDeserialized(ASTContext &C, | |||
1556 | unsigned ID, | |||
1557 | unsigned NumExpansions); | |||
1558 | ||||
1559 | using TemplateParmPosition::getDepth; | |||
1560 | using TemplateParmPosition::setDepth; | |||
1561 | using TemplateParmPosition::getPosition; | |||
1562 | using TemplateParmPosition::setPosition; | |||
1563 | using TemplateParmPosition::getIndex; | |||
1564 | ||||
1565 | /// Whether this template template parameter is a template | |||
1566 | /// parameter pack. | |||
1567 | /// | |||
1568 | /// \code | |||
1569 | /// template<template <class T> ...MetaFunctions> struct Apply; | |||
1570 | /// \endcode | |||
1571 | bool isParameterPack() const { return ParameterPack; } | |||
1572 | ||||
1573 | /// Whether this parameter pack is a pack expansion. | |||
1574 | /// | |||
1575 | /// A template template parameter pack is a pack expansion if its template | |||
1576 | /// parameter list contains an unexpanded parameter pack. | |||
1577 | bool isPackExpansion() const { | |||
1578 | return ParameterPack && | |||
1579 | getTemplateParameters()->containsUnexpandedParameterPack(); | |||
1580 | } | |||
1581 | ||||
1582 | /// Whether this parameter is a template template parameter pack that | |||
1583 | /// has a known list of different template parameter lists at different | |||
1584 | /// positions. | |||
1585 | /// | |||
1586 | /// A parameter pack is an expanded parameter pack when the original parameter | |||
1587 | /// pack's template parameter list was itself a pack expansion, and that | |||
1588 | /// expansion has already been expanded. For exampe, given: | |||
1589 | /// | |||
1590 | /// \code | |||
1591 | /// template<typename...Types> struct Outer { | |||
1592 | /// template<template<Types> class...Templates> struct Inner; | |||
1593 | /// }; | |||
1594 | /// \endcode | |||
1595 | /// | |||
1596 | /// The parameter pack \c Templates is a pack expansion, which expands the | |||
1597 | /// pack \c Types. When \c Types is supplied with template arguments by | |||
1598 | /// instantiating \c Outer, the instantiation of \c Templates is an expanded | |||
1599 | /// parameter pack. | |||
1600 | bool isExpandedParameterPack() const { return ExpandedParameterPack; } | |||
1601 | ||||
1602 | /// Retrieves the number of expansion template parameters in | |||
1603 | /// an expanded parameter pack. | |||
1604 | unsigned getNumExpansionTemplateParameters() const { | |||
1605 | assert(ExpandedParameterPack && "Not an expansion parameter pack")((ExpandedParameterPack && "Not an expansion parameter pack" ) ? static_cast<void> (0) : __assert_fail ("ExpandedParameterPack && \"Not an expansion parameter pack\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1605, __PRETTY_FUNCTION__)); | |||
1606 | return NumExpandedParams; | |||
1607 | } | |||
1608 | ||||
1609 | /// Retrieve a particular expansion type within an expanded parameter | |||
1610 | /// pack. | |||
1611 | TemplateParameterList *getExpansionTemplateParameters(unsigned I) const { | |||
1612 | assert(I < NumExpandedParams && "Out-of-range expansion type index")((I < NumExpandedParams && "Out-of-range expansion type index" ) ? static_cast<void> (0) : __assert_fail ("I < NumExpandedParams && \"Out-of-range expansion type index\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1612, __PRETTY_FUNCTION__)); | |||
1613 | return getTrailingObjects<TemplateParameterList *>()[I]; | |||
1614 | } | |||
1615 | ||||
1616 | const DefArgStorage &getDefaultArgStorage() const { return DefaultArgument; } | |||
1617 | ||||
1618 | /// Determine whether this template parameter has a default | |||
1619 | /// argument. | |||
1620 | bool hasDefaultArgument() const { return DefaultArgument.isSet(); } | |||
1621 | ||||
1622 | /// Retrieve the default argument, if any. | |||
1623 | const TemplateArgumentLoc &getDefaultArgument() const { | |||
1624 | static const TemplateArgumentLoc None; | |||
1625 | return DefaultArgument.isSet() ? *DefaultArgument.get() : None; | |||
1626 | } | |||
1627 | ||||
1628 | /// Retrieve the location of the default argument, if any. | |||
1629 | SourceLocation getDefaultArgumentLoc() const; | |||
1630 | ||||
1631 | /// Determines whether the default argument was inherited | |||
1632 | /// from a previous declaration of this template. | |||
1633 | bool defaultArgumentWasInherited() const { | |||
1634 | return DefaultArgument.isInherited(); | |||
1635 | } | |||
1636 | ||||
1637 | /// Set the default argument for this template parameter, and | |||
1638 | /// whether that default argument was inherited from another | |||
1639 | /// declaration. | |||
1640 | void setDefaultArgument(const ASTContext &C, | |||
1641 | const TemplateArgumentLoc &DefArg); | |||
1642 | void setInheritedDefaultArgument(const ASTContext &C, | |||
1643 | TemplateTemplateParmDecl *Prev) { | |||
1644 | DefaultArgument.setInherited(C, Prev); | |||
1645 | } | |||
1646 | ||||
1647 | /// Removes the default argument of this template parameter. | |||
1648 | void removeDefaultArgument() { DefaultArgument.clear(); } | |||
1649 | ||||
1650 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { | |||
1651 | SourceLocation End = getLocation(); | |||
1652 | if (hasDefaultArgument() && !defaultArgumentWasInherited()) | |||
1653 | End = getDefaultArgument().getSourceRange().getEnd(); | |||
1654 | return SourceRange(getTemplateParameters()->getTemplateLoc(), End); | |||
1655 | } | |||
1656 | ||||
1657 | // Implement isa/cast/dyncast/etc. | |||
1658 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
1659 | static bool classofKind(Kind K) { return K == TemplateTemplateParm; } | |||
1660 | }; | |||
1661 | ||||
1662 | /// Represents the builtin template declaration which is used to | |||
1663 | /// implement __make_integer_seq and other builtin templates. It serves | |||
1664 | /// no real purpose beyond existing as a place to hold template parameters. | |||
1665 | class BuiltinTemplateDecl : public TemplateDecl { | |||
1666 | BuiltinTemplateKind BTK; | |||
1667 | ||||
1668 | BuiltinTemplateDecl(const ASTContext &C, DeclContext *DC, | |||
1669 | DeclarationName Name, BuiltinTemplateKind BTK); | |||
1670 | ||||
1671 | void anchor() override; | |||
1672 | ||||
1673 | public: | |||
1674 | // Implement isa/cast/dyncast support | |||
1675 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
1676 | static bool classofKind(Kind K) { return K == BuiltinTemplate; } | |||
1677 | ||||
1678 | static BuiltinTemplateDecl *Create(const ASTContext &C, DeclContext *DC, | |||
1679 | DeclarationName Name, | |||
1680 | BuiltinTemplateKind BTK) { | |||
1681 | return new (C, DC) BuiltinTemplateDecl(C, DC, Name, BTK); | |||
1682 | } | |||
1683 | ||||
1684 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)) { | |||
1685 | return {}; | |||
1686 | } | |||
1687 | ||||
1688 | BuiltinTemplateKind getBuiltinTemplateKind() const { return BTK; } | |||
1689 | }; | |||
1690 | ||||
1691 | /// Represents a class template specialization, which refers to | |||
1692 | /// a class template with a given set of template arguments. | |||
1693 | /// | |||
1694 | /// Class template specializations represent both explicit | |||
1695 | /// specialization of class templates, as in the example below, and | |||
1696 | /// implicit instantiations of class templates. | |||
1697 | /// | |||
1698 | /// \code | |||
1699 | /// template<typename T> class array; | |||
1700 | /// | |||
1701 | /// template<> | |||
1702 | /// class array<bool> { }; // class template specialization array<bool> | |||
1703 | /// \endcode | |||
1704 | class ClassTemplateSpecializationDecl | |||
1705 | : public CXXRecordDecl, public llvm::FoldingSetNode { | |||
1706 | /// Structure that stores information about a class template | |||
1707 | /// specialization that was instantiated from a class template partial | |||
1708 | /// specialization. | |||
1709 | struct SpecializedPartialSpecialization { | |||
1710 | /// The class template partial specialization from which this | |||
1711 | /// class template specialization was instantiated. | |||
1712 | ClassTemplatePartialSpecializationDecl *PartialSpecialization; | |||
1713 | ||||
1714 | /// The template argument list deduced for the class template | |||
1715 | /// partial specialization itself. | |||
1716 | const TemplateArgumentList *TemplateArgs; | |||
1717 | }; | |||
1718 | ||||
1719 | /// The template that this specialization specializes | |||
1720 | llvm::PointerUnion<ClassTemplateDecl *, SpecializedPartialSpecialization *> | |||
1721 | SpecializedTemplate; | |||
1722 | ||||
1723 | /// Further info for explicit template specialization/instantiation. | |||
1724 | struct ExplicitSpecializationInfo { | |||
1725 | /// The type-as-written. | |||
1726 | TypeSourceInfo *TypeAsWritten = nullptr; | |||
1727 | ||||
1728 | /// The location of the extern keyword. | |||
1729 | SourceLocation ExternLoc; | |||
1730 | ||||
1731 | /// The location of the template keyword. | |||
1732 | SourceLocation TemplateKeywordLoc; | |||
1733 | ||||
1734 | ExplicitSpecializationInfo() = default; | |||
1735 | }; | |||
1736 | ||||
1737 | /// Further info for explicit template specialization/instantiation. | |||
1738 | /// Does not apply to implicit specializations. | |||
1739 | ExplicitSpecializationInfo *ExplicitInfo = nullptr; | |||
1740 | ||||
1741 | /// The template arguments used to describe this specialization. | |||
1742 | const TemplateArgumentList *TemplateArgs; | |||
1743 | ||||
1744 | /// The point where this template was instantiated (if any) | |||
1745 | SourceLocation PointOfInstantiation; | |||
1746 | ||||
1747 | /// The kind of specialization this declaration refers to. | |||
1748 | /// Really a value of type TemplateSpecializationKind. | |||
1749 | unsigned SpecializationKind : 3; | |||
1750 | ||||
1751 | protected: | |||
1752 | ClassTemplateSpecializationDecl(ASTContext &Context, Kind DK, TagKind TK, | |||
1753 | DeclContext *DC, SourceLocation StartLoc, | |||
1754 | SourceLocation IdLoc, | |||
1755 | ClassTemplateDecl *SpecializedTemplate, | |||
1756 | ArrayRef<TemplateArgument> Args, | |||
1757 | ClassTemplateSpecializationDecl *PrevDecl); | |||
1758 | ||||
1759 | explicit ClassTemplateSpecializationDecl(ASTContext &C, Kind DK); | |||
1760 | ||||
1761 | public: | |||
1762 | friend class ASTDeclReader; | |||
1763 | friend class ASTDeclWriter; | |||
1764 | ||||
1765 | static ClassTemplateSpecializationDecl * | |||
1766 | Create(ASTContext &Context, TagKind TK, DeclContext *DC, | |||
1767 | SourceLocation StartLoc, SourceLocation IdLoc, | |||
1768 | ClassTemplateDecl *SpecializedTemplate, | |||
1769 | ArrayRef<TemplateArgument> Args, | |||
1770 | ClassTemplateSpecializationDecl *PrevDecl); | |||
1771 | static ClassTemplateSpecializationDecl * | |||
1772 | CreateDeserialized(ASTContext &C, unsigned ID); | |||
1773 | ||||
1774 | void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy, | |||
1775 | bool Qualified) const override; | |||
1776 | ||||
1777 | // FIXME: This is broken. CXXRecordDecl::getMostRecentDecl() returns a | |||
1778 | // different "most recent" declaration from this function for the same | |||
1779 | // declaration, because we don't override getMostRecentDeclImpl(). But | |||
1780 | // it's not clear that we should override that, because the most recent | |||
1781 | // declaration as a CXXRecordDecl sometimes is the injected-class-name. | |||
1782 | ClassTemplateSpecializationDecl *getMostRecentDecl() { | |||
1783 | return cast<ClassTemplateSpecializationDecl>( | |||
1784 | getMostRecentNonInjectedDecl()); | |||
1785 | } | |||
1786 | ||||
1787 | /// Retrieve the template that this specialization specializes. | |||
1788 | ClassTemplateDecl *getSpecializedTemplate() const; | |||
1789 | ||||
1790 | /// Retrieve the template arguments of the class template | |||
1791 | /// specialization. | |||
1792 | const TemplateArgumentList &getTemplateArgs() const { | |||
1793 | return *TemplateArgs; | |||
1794 | } | |||
1795 | ||||
1796 | /// Determine the kind of specialization that this | |||
1797 | /// declaration represents. | |||
1798 | TemplateSpecializationKind getSpecializationKind() const { | |||
1799 | return static_cast<TemplateSpecializationKind>(SpecializationKind); | |||
1800 | } | |||
1801 | ||||
1802 | bool isExplicitSpecialization() const { | |||
1803 | return getSpecializationKind() == TSK_ExplicitSpecialization; | |||
1804 | } | |||
1805 | ||||
1806 | /// Is this an explicit specialization at class scope (within the class that | |||
1807 | /// owns the primary template)? For example: | |||
1808 | /// | |||
1809 | /// \code | |||
1810 | /// template<typename T> struct Outer { | |||
1811 | /// template<typename U> struct Inner; | |||
1812 | /// template<> struct Inner; // class-scope explicit specialization | |||
1813 | /// }; | |||
1814 | /// \endcode | |||
1815 | bool isClassScopeExplicitSpecialization() const { | |||
1816 | return isExplicitSpecialization() && | |||
1817 | isa<CXXRecordDecl>(getLexicalDeclContext()); | |||
1818 | } | |||
1819 | ||||
1820 | /// True if this declaration is an explicit specialization, | |||
1821 | /// explicit instantiation declaration, or explicit instantiation | |||
1822 | /// definition. | |||
1823 | bool isExplicitInstantiationOrSpecialization() const { | |||
1824 | return isTemplateExplicitInstantiationOrSpecialization( | |||
1825 | getTemplateSpecializationKind()); | |||
1826 | } | |||
1827 | ||||
1828 | void setSpecializationKind(TemplateSpecializationKind TSK) { | |||
1829 | SpecializationKind = TSK; | |||
1830 | } | |||
1831 | ||||
1832 | /// Get the point of instantiation (if any), or null if none. | |||
1833 | SourceLocation getPointOfInstantiation() const { | |||
1834 | return PointOfInstantiation; | |||
1835 | } | |||
1836 | ||||
1837 | void setPointOfInstantiation(SourceLocation Loc) { | |||
1838 | assert(Loc.isValid() && "point of instantiation must be valid!")((Loc.isValid() && "point of instantiation must be valid!" ) ? static_cast<void> (0) : __assert_fail ("Loc.isValid() && \"point of instantiation must be valid!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1838, __PRETTY_FUNCTION__)); | |||
1839 | PointOfInstantiation = Loc; | |||
1840 | } | |||
1841 | ||||
1842 | /// If this class template specialization is an instantiation of | |||
1843 | /// a template (rather than an explicit specialization), return the | |||
1844 | /// class template or class template partial specialization from which it | |||
1845 | /// was instantiated. | |||
1846 | llvm::PointerUnion<ClassTemplateDecl *, | |||
1847 | ClassTemplatePartialSpecializationDecl *> | |||
1848 | getInstantiatedFrom() const { | |||
1849 | if (!isTemplateInstantiation(getSpecializationKind())) | |||
1850 | return llvm::PointerUnion<ClassTemplateDecl *, | |||
1851 | ClassTemplatePartialSpecializationDecl *>(); | |||
1852 | ||||
1853 | return getSpecializedTemplateOrPartial(); | |||
1854 | } | |||
1855 | ||||
1856 | /// Retrieve the class template or class template partial | |||
1857 | /// specialization which was specialized by this. | |||
1858 | llvm::PointerUnion<ClassTemplateDecl *, | |||
1859 | ClassTemplatePartialSpecializationDecl *> | |||
1860 | getSpecializedTemplateOrPartial() const { | |||
1861 | if (const auto *PartialSpec = | |||
1862 | SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>()) | |||
1863 | return PartialSpec->PartialSpecialization; | |||
1864 | ||||
1865 | return SpecializedTemplate.get<ClassTemplateDecl*>(); | |||
1866 | } | |||
1867 | ||||
1868 | /// Retrieve the set of template arguments that should be used | |||
1869 | /// to instantiate members of the class template or class template partial | |||
1870 | /// specialization from which this class template specialization was | |||
1871 | /// instantiated. | |||
1872 | /// | |||
1873 | /// \returns For a class template specialization instantiated from the primary | |||
1874 | /// template, this function will return the same template arguments as | |||
1875 | /// getTemplateArgs(). For a class template specialization instantiated from | |||
1876 | /// a class template partial specialization, this function will return the | |||
1877 | /// deduced template arguments for the class template partial specialization | |||
1878 | /// itself. | |||
1879 | const TemplateArgumentList &getTemplateInstantiationArgs() const { | |||
1880 | if (const auto *PartialSpec = | |||
1881 | SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>()) | |||
1882 | return *PartialSpec->TemplateArgs; | |||
1883 | ||||
1884 | return getTemplateArgs(); | |||
1885 | } | |||
1886 | ||||
1887 | /// Note that this class template specialization is actually an | |||
1888 | /// instantiation of the given class template partial specialization whose | |||
1889 | /// template arguments have been deduced. | |||
1890 | void setInstantiationOf(ClassTemplatePartialSpecializationDecl *PartialSpec, | |||
1891 | const TemplateArgumentList *TemplateArgs) { | |||
1892 | assert(!SpecializedTemplate.is<SpecializedPartialSpecialization*>() &&((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Already set to a class template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Already set to a class template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1893, __PRETTY_FUNCTION__)) | |||
1893 | "Already set to a class template partial specialization!")((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Already set to a class template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Already set to a class template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1893, __PRETTY_FUNCTION__)); | |||
1894 | auto *PS = new (getASTContext()) SpecializedPartialSpecialization(); | |||
1895 | PS->PartialSpecialization = PartialSpec; | |||
1896 | PS->TemplateArgs = TemplateArgs; | |||
1897 | SpecializedTemplate = PS; | |||
1898 | } | |||
1899 | ||||
1900 | /// Note that this class template specialization is an instantiation | |||
1901 | /// of the given class template. | |||
1902 | void setInstantiationOf(ClassTemplateDecl *TemplDecl) { | |||
1903 | assert(!SpecializedTemplate.is<SpecializedPartialSpecialization*>() &&((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Previously set to a class template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Previously set to a class template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1904, __PRETTY_FUNCTION__)) | |||
1904 | "Previously set to a class template partial specialization!")((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Previously set to a class template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization*>() && \"Previously set to a class template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 1904, __PRETTY_FUNCTION__)); | |||
1905 | SpecializedTemplate = TemplDecl; | |||
1906 | } | |||
1907 | ||||
1908 | /// Sets the type of this specialization as it was written by | |||
1909 | /// the user. This will be a class template specialization type. | |||
1910 | void setTypeAsWritten(TypeSourceInfo *T) { | |||
1911 | if (!ExplicitInfo) | |||
1912 | ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo; | |||
1913 | ExplicitInfo->TypeAsWritten = T; | |||
1914 | } | |||
1915 | ||||
1916 | /// Gets the type of this specialization as it was written by | |||
1917 | /// the user, if it was so written. | |||
1918 | TypeSourceInfo *getTypeAsWritten() const { | |||
1919 | return ExplicitInfo ? ExplicitInfo->TypeAsWritten : nullptr; | |||
1920 | } | |||
1921 | ||||
1922 | /// Gets the location of the extern keyword, if present. | |||
1923 | SourceLocation getExternLoc() const { | |||
1924 | return ExplicitInfo ? ExplicitInfo->ExternLoc : SourceLocation(); | |||
1925 | } | |||
1926 | ||||
1927 | /// Sets the location of the extern keyword. | |||
1928 | void setExternLoc(SourceLocation Loc) { | |||
1929 | if (!ExplicitInfo) | |||
1930 | ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo; | |||
1931 | ExplicitInfo->ExternLoc = Loc; | |||
1932 | } | |||
1933 | ||||
1934 | /// Sets the location of the template keyword. | |||
1935 | void setTemplateKeywordLoc(SourceLocation Loc) { | |||
1936 | if (!ExplicitInfo) | |||
1937 | ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo; | |||
1938 | ExplicitInfo->TemplateKeywordLoc = Loc; | |||
1939 | } | |||
1940 | ||||
1941 | /// Gets the location of the template keyword, if present. | |||
1942 | SourceLocation getTemplateKeywordLoc() const { | |||
1943 | return ExplicitInfo ? ExplicitInfo->TemplateKeywordLoc : SourceLocation(); | |||
1944 | } | |||
1945 | ||||
1946 | SourceRange getSourceRange() const override LLVM_READONLY__attribute__((__pure__)); | |||
1947 | ||||
1948 | void Profile(llvm::FoldingSetNodeID &ID) const { | |||
1949 | Profile(ID, TemplateArgs->asArray(), getASTContext()); | |||
1950 | } | |||
1951 | ||||
1952 | static void | |||
1953 | Profile(llvm::FoldingSetNodeID &ID, ArrayRef<TemplateArgument> TemplateArgs, | |||
1954 | ASTContext &Context) { | |||
1955 | ID.AddInteger(TemplateArgs.size()); | |||
1956 | for (const TemplateArgument &TemplateArg : TemplateArgs) | |||
1957 | TemplateArg.Profile(ID, Context); | |||
1958 | } | |||
1959 | ||||
1960 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
1961 | ||||
1962 | static bool classofKind(Kind K) { | |||
1963 | return K >= firstClassTemplateSpecialization && | |||
1964 | K <= lastClassTemplateSpecialization; | |||
1965 | } | |||
1966 | }; | |||
1967 | ||||
1968 | class ClassTemplatePartialSpecializationDecl | |||
1969 | : public ClassTemplateSpecializationDecl { | |||
1970 | /// The list of template parameters | |||
1971 | TemplateParameterList* TemplateParams = nullptr; | |||
1972 | ||||
1973 | /// The source info for the template arguments as written. | |||
1974 | /// FIXME: redundant with TypeAsWritten? | |||
1975 | const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr; | |||
1976 | ||||
1977 | /// The class template partial specialization from which this | |||
1978 | /// class template partial specialization was instantiated. | |||
1979 | /// | |||
1980 | /// The boolean value will be true to indicate that this class template | |||
1981 | /// partial specialization was specialized at this level. | |||
1982 | llvm::PointerIntPair<ClassTemplatePartialSpecializationDecl *, 1, bool> | |||
1983 | InstantiatedFromMember; | |||
1984 | ||||
1985 | ClassTemplatePartialSpecializationDecl(ASTContext &Context, TagKind TK, | |||
1986 | DeclContext *DC, | |||
1987 | SourceLocation StartLoc, | |||
1988 | SourceLocation IdLoc, | |||
1989 | TemplateParameterList *Params, | |||
1990 | ClassTemplateDecl *SpecializedTemplate, | |||
1991 | ArrayRef<TemplateArgument> Args, | |||
1992 | const ASTTemplateArgumentListInfo *ArgsAsWritten, | |||
1993 | ClassTemplatePartialSpecializationDecl *PrevDecl); | |||
1994 | ||||
1995 | ClassTemplatePartialSpecializationDecl(ASTContext &C) | |||
1996 | : ClassTemplateSpecializationDecl(C, ClassTemplatePartialSpecialization), | |||
1997 | InstantiatedFromMember(nullptr, false) {} | |||
1998 | ||||
1999 | void anchor() override; | |||
2000 | ||||
2001 | public: | |||
2002 | friend class ASTDeclReader; | |||
2003 | friend class ASTDeclWriter; | |||
2004 | ||||
2005 | static ClassTemplatePartialSpecializationDecl * | |||
2006 | Create(ASTContext &Context, TagKind TK, DeclContext *DC, | |||
2007 | SourceLocation StartLoc, SourceLocation IdLoc, | |||
2008 | TemplateParameterList *Params, | |||
2009 | ClassTemplateDecl *SpecializedTemplate, | |||
2010 | ArrayRef<TemplateArgument> Args, | |||
2011 | const TemplateArgumentListInfo &ArgInfos, | |||
2012 | QualType CanonInjectedType, | |||
2013 | ClassTemplatePartialSpecializationDecl *PrevDecl); | |||
2014 | ||||
2015 | static ClassTemplatePartialSpecializationDecl * | |||
2016 | CreateDeserialized(ASTContext &C, unsigned ID); | |||
2017 | ||||
2018 | ClassTemplatePartialSpecializationDecl *getMostRecentDecl() { | |||
2019 | return cast<ClassTemplatePartialSpecializationDecl>( | |||
2020 | static_cast<ClassTemplateSpecializationDecl *>( | |||
2021 | this)->getMostRecentDecl()); | |||
2022 | } | |||
2023 | ||||
2024 | /// Get the list of template parameters | |||
2025 | TemplateParameterList *getTemplateParameters() const { | |||
2026 | return TemplateParams; | |||
2027 | } | |||
2028 | ||||
2029 | /// Get the template arguments as written. | |||
2030 | const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const { | |||
2031 | return ArgsAsWritten; | |||
2032 | } | |||
2033 | ||||
2034 | /// Retrieve the member class template partial specialization from | |||
2035 | /// which this particular class template partial specialization was | |||
2036 | /// instantiated. | |||
2037 | /// | |||
2038 | /// \code | |||
2039 | /// template<typename T> | |||
2040 | /// struct Outer { | |||
2041 | /// template<typename U> struct Inner; | |||
2042 | /// template<typename U> struct Inner<U*> { }; // #1 | |||
2043 | /// }; | |||
2044 | /// | |||
2045 | /// Outer<float>::Inner<int*> ii; | |||
2046 | /// \endcode | |||
2047 | /// | |||
2048 | /// In this example, the instantiation of \c Outer<float>::Inner<int*> will | |||
2049 | /// end up instantiating the partial specialization | |||
2050 | /// \c Outer<float>::Inner<U*>, which itself was instantiated from the class | |||
2051 | /// template partial specialization \c Outer<T>::Inner<U*>. Given | |||
2052 | /// \c Outer<float>::Inner<U*>, this function would return | |||
2053 | /// \c Outer<T>::Inner<U*>. | |||
2054 | ClassTemplatePartialSpecializationDecl *getInstantiatedFromMember() const { | |||
2055 | const auto *First = | |||
2056 | cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2057 | return First->InstantiatedFromMember.getPointer(); | |||
2058 | } | |||
2059 | ClassTemplatePartialSpecializationDecl * | |||
2060 | getInstantiatedFromMemberTemplate() const { | |||
2061 | return getInstantiatedFromMember(); | |||
2062 | } | |||
2063 | ||||
2064 | void setInstantiatedFromMember( | |||
2065 | ClassTemplatePartialSpecializationDecl *PartialSpec) { | |||
2066 | auto *First = cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2067 | First->InstantiatedFromMember.setPointer(PartialSpec); | |||
2068 | } | |||
2069 | ||||
2070 | /// Determines whether this class template partial specialization | |||
2071 | /// template was a specialization of a member partial specialization. | |||
2072 | /// | |||
2073 | /// In the following example, the member template partial specialization | |||
2074 | /// \c X<int>::Inner<T*> is a member specialization. | |||
2075 | /// | |||
2076 | /// \code | |||
2077 | /// template<typename T> | |||
2078 | /// struct X { | |||
2079 | /// template<typename U> struct Inner; | |||
2080 | /// template<typename U> struct Inner<U*>; | |||
2081 | /// }; | |||
2082 | /// | |||
2083 | /// template<> template<typename T> | |||
2084 | /// struct X<int>::Inner<T*> { /* ... */ }; | |||
2085 | /// \endcode | |||
2086 | bool isMemberSpecialization() { | |||
2087 | const auto *First = | |||
2088 | cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2089 | return First->InstantiatedFromMember.getInt(); | |||
2090 | } | |||
2091 | ||||
2092 | /// Note that this member template is a specialization. | |||
2093 | void setMemberSpecialization() { | |||
2094 | auto *First = cast<ClassTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2095 | assert(First->InstantiatedFromMember.getPointer() &&((First->InstantiatedFromMember.getPointer() && "Only member templates can be member template specializations" ) ? static_cast<void> (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2096, __PRETTY_FUNCTION__)) | |||
2096 | "Only member templates can be member template specializations")((First->InstantiatedFromMember.getPointer() && "Only member templates can be member template specializations" ) ? static_cast<void> (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2096, __PRETTY_FUNCTION__)); | |||
2097 | return First->InstantiatedFromMember.setInt(true); | |||
2098 | } | |||
2099 | ||||
2100 | /// Retrieves the injected specialization type for this partial | |||
2101 | /// specialization. This is not the same as the type-decl-type for | |||
2102 | /// this partial specialization, which is an InjectedClassNameType. | |||
2103 | QualType getInjectedSpecializationType() const { | |||
2104 | assert(getTypeForDecl() && "partial specialization has no type set!")((getTypeForDecl() && "partial specialization has no type set!" ) ? static_cast<void> (0) : __assert_fail ("getTypeForDecl() && \"partial specialization has no type set!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2104, __PRETTY_FUNCTION__)); | |||
2105 | return cast<InjectedClassNameType>(getTypeForDecl()) | |||
2106 | ->getInjectedSpecializationType(); | |||
2107 | } | |||
2108 | ||||
2109 | // FIXME: Add Profile support! | |||
2110 | ||||
2111 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
2112 | ||||
2113 | static bool classofKind(Kind K) { | |||
2114 | return K == ClassTemplatePartialSpecialization; | |||
2115 | } | |||
2116 | }; | |||
2117 | ||||
2118 | /// Declaration of a class template. | |||
2119 | class ClassTemplateDecl : public RedeclarableTemplateDecl { | |||
2120 | protected: | |||
2121 | /// Data that is common to all of the declarations of a given | |||
2122 | /// class template. | |||
2123 | struct Common : CommonBase { | |||
2124 | /// The class template specializations for this class | |||
2125 | /// template, including explicit specializations and instantiations. | |||
2126 | llvm::FoldingSetVector<ClassTemplateSpecializationDecl> Specializations; | |||
2127 | ||||
2128 | /// The class template partial specializations for this class | |||
2129 | /// template. | |||
2130 | llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> | |||
2131 | PartialSpecializations; | |||
2132 | ||||
2133 | /// The injected-class-name type for this class template. | |||
2134 | QualType InjectedClassNameType; | |||
2135 | ||||
2136 | Common() = default; | |||
2137 | }; | |||
2138 | ||||
2139 | /// Retrieve the set of specializations of this class template. | |||
2140 | llvm::FoldingSetVector<ClassTemplateSpecializationDecl> & | |||
2141 | getSpecializations() const; | |||
2142 | ||||
2143 | /// Retrieve the set of partial specializations of this class | |||
2144 | /// template. | |||
2145 | llvm::FoldingSetVector<ClassTemplatePartialSpecializationDecl> & | |||
2146 | getPartialSpecializations(); | |||
2147 | ||||
2148 | ClassTemplateDecl(ConstrainedTemplateDeclInfo *CTDI, ASTContext &C, | |||
2149 | DeclContext *DC, SourceLocation L, DeclarationName Name, | |||
2150 | TemplateParameterList *Params, NamedDecl *Decl) | |||
2151 | : RedeclarableTemplateDecl(CTDI, ClassTemplate, C, DC, L, Name, Params, | |||
2152 | Decl) {} | |||
2153 | ||||
2154 | ClassTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L, | |||
2155 | DeclarationName Name, TemplateParameterList *Params, | |||
2156 | NamedDecl *Decl) | |||
2157 | : ClassTemplateDecl(nullptr, C, DC, L, Name, Params, Decl) {} | |||
2158 | ||||
2159 | CommonBase *newCommon(ASTContext &C) const override; | |||
2160 | ||||
2161 | Common *getCommonPtr() const { | |||
2162 | return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr()); | |||
2163 | } | |||
2164 | ||||
2165 | public: | |||
2166 | friend class ASTDeclReader; | |||
2167 | friend class ASTDeclWriter; | |||
2168 | ||||
2169 | /// Load any lazily-loaded specializations from the external source. | |||
2170 | void LoadLazySpecializations() const; | |||
2171 | ||||
2172 | /// Get the underlying class declarations of the template. | |||
2173 | CXXRecordDecl *getTemplatedDecl() const { | |||
2174 | return static_cast<CXXRecordDecl *>(TemplatedDecl); | |||
2175 | } | |||
2176 | ||||
2177 | /// Returns whether this template declaration defines the primary | |||
2178 | /// class pattern. | |||
2179 | bool isThisDeclarationADefinition() const { | |||
2180 | return getTemplatedDecl()->isThisDeclarationADefinition(); | |||
2181 | } | |||
2182 | ||||
2183 | // FIXME: remove default argument for AssociatedConstraints | |||
2184 | /// Create a class template node. | |||
2185 | static ClassTemplateDecl *Create(ASTContext &C, DeclContext *DC, | |||
2186 | SourceLocation L, | |||
2187 | DeclarationName Name, | |||
2188 | TemplateParameterList *Params, | |||
2189 | NamedDecl *Decl, | |||
2190 | Expr *AssociatedConstraints = nullptr); | |||
2191 | ||||
2192 | /// Create an empty class template node. | |||
2193 | static ClassTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID); | |||
2194 | ||||
2195 | /// Return the specialization with the provided arguments if it exists, | |||
2196 | /// otherwise return the insertion point. | |||
2197 | ClassTemplateSpecializationDecl * | |||
2198 | findSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos); | |||
2199 | ||||
2200 | /// Insert the specified specialization knowing that it is not already | |||
2201 | /// in. InsertPos must be obtained from findSpecialization. | |||
2202 | void AddSpecialization(ClassTemplateSpecializationDecl *D, void *InsertPos); | |||
2203 | ||||
2204 | ClassTemplateDecl *getCanonicalDecl() override { | |||
2205 | return cast<ClassTemplateDecl>( | |||
2206 | RedeclarableTemplateDecl::getCanonicalDecl()); | |||
2207 | } | |||
2208 | const ClassTemplateDecl *getCanonicalDecl() const { | |||
2209 | return cast<ClassTemplateDecl>( | |||
2210 | RedeclarableTemplateDecl::getCanonicalDecl()); | |||
2211 | } | |||
2212 | ||||
2213 | /// Retrieve the previous declaration of this class template, or | |||
2214 | /// nullptr if no such declaration exists. | |||
2215 | ClassTemplateDecl *getPreviousDecl() { | |||
2216 | return cast_or_null<ClassTemplateDecl>( | |||
2217 | static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl()); | |||
2218 | } | |||
2219 | const ClassTemplateDecl *getPreviousDecl() const { | |||
2220 | return cast_or_null<ClassTemplateDecl>( | |||
2221 | static_cast<const RedeclarableTemplateDecl *>( | |||
2222 | this)->getPreviousDecl()); | |||
2223 | } | |||
2224 | ||||
2225 | ClassTemplateDecl *getMostRecentDecl() { | |||
2226 | return cast<ClassTemplateDecl>( | |||
2227 | static_cast<RedeclarableTemplateDecl *>(this)->getMostRecentDecl()); | |||
2228 | } | |||
2229 | const ClassTemplateDecl *getMostRecentDecl() const { | |||
2230 | return const_cast<ClassTemplateDecl*>(this)->getMostRecentDecl(); | |||
2231 | } | |||
2232 | ||||
2233 | ClassTemplateDecl *getInstantiatedFromMemberTemplate() const { | |||
2234 | return cast_or_null<ClassTemplateDecl>( | |||
2235 | RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate()); | |||
2236 | } | |||
2237 | ||||
2238 | /// Return the partial specialization with the provided arguments if it | |||
2239 | /// exists, otherwise return the insertion point. | |||
2240 | ClassTemplatePartialSpecializationDecl * | |||
2241 | findPartialSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos); | |||
2242 | ||||
2243 | /// Insert the specified partial specialization knowing that it is not | |||
2244 | /// already in. InsertPos must be obtained from findPartialSpecialization. | |||
2245 | void AddPartialSpecialization(ClassTemplatePartialSpecializationDecl *D, | |||
2246 | void *InsertPos); | |||
2247 | ||||
2248 | /// Retrieve the partial specializations as an ordered list. | |||
2249 | void getPartialSpecializations( | |||
2250 | SmallVectorImpl<ClassTemplatePartialSpecializationDecl *> &PS); | |||
2251 | ||||
2252 | /// Find a class template partial specialization with the given | |||
2253 | /// type T. | |||
2254 | /// | |||
2255 | /// \param T a dependent type that names a specialization of this class | |||
2256 | /// template. | |||
2257 | /// | |||
2258 | /// \returns the class template partial specialization that exactly matches | |||
2259 | /// the type \p T, or nullptr if no such partial specialization exists. | |||
2260 | ClassTemplatePartialSpecializationDecl *findPartialSpecialization(QualType T); | |||
2261 | ||||
2262 | /// Find a class template partial specialization which was instantiated | |||
2263 | /// from the given member partial specialization. | |||
2264 | /// | |||
2265 | /// \param D a member class template partial specialization. | |||
2266 | /// | |||
2267 | /// \returns the class template partial specialization which was instantiated | |||
2268 | /// from the given member partial specialization, or nullptr if no such | |||
2269 | /// partial specialization exists. | |||
2270 | ClassTemplatePartialSpecializationDecl * | |||
2271 | findPartialSpecInstantiatedFromMember( | |||
2272 | ClassTemplatePartialSpecializationDecl *D); | |||
2273 | ||||
2274 | /// Retrieve the template specialization type of the | |||
2275 | /// injected-class-name for this class template. | |||
2276 | /// | |||
2277 | /// The injected-class-name for a class template \c X is \c | |||
2278 | /// X<template-args>, where \c template-args is formed from the | |||
2279 | /// template arguments that correspond to the template parameters of | |||
2280 | /// \c X. For example: | |||
2281 | /// | |||
2282 | /// \code | |||
2283 | /// template<typename T, int N> | |||
2284 | /// struct array { | |||
2285 | /// typedef array this_type; // "array" is equivalent to "array<T, N>" | |||
2286 | /// }; | |||
2287 | /// \endcode | |||
2288 | QualType getInjectedClassNameSpecialization(); | |||
2289 | ||||
2290 | using spec_iterator = SpecIterator<ClassTemplateSpecializationDecl>; | |||
2291 | using spec_range = llvm::iterator_range<spec_iterator>; | |||
2292 | ||||
2293 | spec_range specializations() const { | |||
2294 | return spec_range(spec_begin(), spec_end()); | |||
2295 | } | |||
2296 | ||||
2297 | spec_iterator spec_begin() const { | |||
2298 | return makeSpecIterator(getSpecializations(), false); | |||
2299 | } | |||
2300 | ||||
2301 | spec_iterator spec_end() const { | |||
2302 | return makeSpecIterator(getSpecializations(), true); | |||
2303 | } | |||
2304 | ||||
2305 | // Implement isa/cast/dyncast support | |||
2306 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
2307 | static bool classofKind(Kind K) { return K == ClassTemplate; } | |||
2308 | }; | |||
2309 | ||||
2310 | /// Declaration of a friend template. | |||
2311 | /// | |||
2312 | /// For example: | |||
2313 | /// \code | |||
2314 | /// template \<typename T> class A { | |||
2315 | /// friend class MyVector<T>; // not a friend template | |||
2316 | /// template \<typename U> friend class B; // not a friend template | |||
2317 | /// template \<typename U> friend class Foo<T>::Nested; // friend template | |||
2318 | /// }; | |||
2319 | /// \endcode | |||
2320 | /// | |||
2321 | /// \note This class is not currently in use. All of the above | |||
2322 | /// will yield a FriendDecl, not a FriendTemplateDecl. | |||
2323 | class FriendTemplateDecl : public Decl { | |||
2324 | virtual void anchor(); | |||
2325 | ||||
2326 | public: | |||
2327 | using FriendUnion = llvm::PointerUnion<NamedDecl *,TypeSourceInfo *>; | |||
2328 | ||||
2329 | private: | |||
2330 | // The number of template parameters; always non-zero. | |||
2331 | unsigned NumParams = 0; | |||
2332 | ||||
2333 | // The parameter list. | |||
2334 | TemplateParameterList **Params = nullptr; | |||
2335 | ||||
2336 | // The declaration that's a friend of this class. | |||
2337 | FriendUnion Friend; | |||
2338 | ||||
2339 | // Location of the 'friend' specifier. | |||
2340 | SourceLocation FriendLoc; | |||
2341 | ||||
2342 | FriendTemplateDecl(DeclContext *DC, SourceLocation Loc, | |||
2343 | MutableArrayRef<TemplateParameterList *> Params, | |||
2344 | FriendUnion Friend, SourceLocation FriendLoc) | |||
2345 | : Decl(Decl::FriendTemplate, DC, Loc), NumParams(Params.size()), | |||
2346 | Params(Params.data()), Friend(Friend), FriendLoc(FriendLoc) {} | |||
2347 | ||||
2348 | FriendTemplateDecl(EmptyShell Empty) : Decl(Decl::FriendTemplate, Empty) {} | |||
2349 | ||||
2350 | public: | |||
2351 | friend class ASTDeclReader; | |||
2352 | ||||
2353 | static FriendTemplateDecl * | |||
2354 | Create(ASTContext &Context, DeclContext *DC, SourceLocation Loc, | |||
2355 | MutableArrayRef<TemplateParameterList *> Params, FriendUnion Friend, | |||
2356 | SourceLocation FriendLoc); | |||
2357 | ||||
2358 | static FriendTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID); | |||
2359 | ||||
2360 | /// If this friend declaration names a templated type (or | |||
2361 | /// a dependent member type of a templated type), return that | |||
2362 | /// type; otherwise return null. | |||
2363 | TypeSourceInfo *getFriendType() const { | |||
2364 | return Friend.dyn_cast<TypeSourceInfo*>(); | |||
2365 | } | |||
2366 | ||||
2367 | /// If this friend declaration names a templated function (or | |||
2368 | /// a member function of a templated type), return that type; | |||
2369 | /// otherwise return null. | |||
2370 | NamedDecl *getFriendDecl() const { | |||
2371 | return Friend.dyn_cast<NamedDecl*>(); | |||
2372 | } | |||
2373 | ||||
2374 | /// Retrieves the location of the 'friend' keyword. | |||
2375 | SourceLocation getFriendLoc() const { | |||
2376 | return FriendLoc; | |||
2377 | } | |||
2378 | ||||
2379 | TemplateParameterList *getTemplateParameterList(unsigned i) const { | |||
2380 | assert(i <= NumParams)((i <= NumParams) ? static_cast<void> (0) : __assert_fail ("i <= NumParams", "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2380, __PRETTY_FUNCTION__)); | |||
2381 | return Params[i]; | |||
2382 | } | |||
2383 | ||||
2384 | unsigned getNumTemplateParameters() const { | |||
2385 | return NumParams; | |||
2386 | } | |||
2387 | ||||
2388 | // Implement isa/cast/dyncast/etc. | |||
2389 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
2390 | static bool classofKind(Kind K) { return K == Decl::FriendTemplate; } | |||
2391 | }; | |||
2392 | ||||
2393 | /// Declaration of an alias template. | |||
2394 | /// | |||
2395 | /// For example: | |||
2396 | /// \code | |||
2397 | /// template \<typename T> using V = std::map<T*, int, MyCompare<T>>; | |||
2398 | /// \endcode | |||
2399 | class TypeAliasTemplateDecl : public RedeclarableTemplateDecl { | |||
2400 | protected: | |||
2401 | using Common = CommonBase; | |||
2402 | ||||
2403 | TypeAliasTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L, | |||
2404 | DeclarationName Name, TemplateParameterList *Params, | |||
2405 | NamedDecl *Decl) | |||
2406 | : RedeclarableTemplateDecl(TypeAliasTemplate, C, DC, L, Name, Params, | |||
2407 | Decl) {} | |||
2408 | ||||
2409 | CommonBase *newCommon(ASTContext &C) const override; | |||
2410 | ||||
2411 | Common *getCommonPtr() { | |||
2412 | return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr()); | |||
2413 | } | |||
2414 | ||||
2415 | public: | |||
2416 | friend class ASTDeclReader; | |||
2417 | friend class ASTDeclWriter; | |||
2418 | ||||
2419 | /// Get the underlying function declaration of the template. | |||
2420 | TypeAliasDecl *getTemplatedDecl() const { | |||
2421 | return static_cast<TypeAliasDecl *>(TemplatedDecl); | |||
2422 | } | |||
2423 | ||||
2424 | ||||
2425 | TypeAliasTemplateDecl *getCanonicalDecl() override { | |||
2426 | return cast<TypeAliasTemplateDecl>( | |||
2427 | RedeclarableTemplateDecl::getCanonicalDecl()); | |||
2428 | } | |||
2429 | const TypeAliasTemplateDecl *getCanonicalDecl() const { | |||
2430 | return cast<TypeAliasTemplateDecl>( | |||
2431 | RedeclarableTemplateDecl::getCanonicalDecl()); | |||
2432 | } | |||
2433 | ||||
2434 | /// Retrieve the previous declaration of this function template, or | |||
2435 | /// nullptr if no such declaration exists. | |||
2436 | TypeAliasTemplateDecl *getPreviousDecl() { | |||
2437 | return cast_or_null<TypeAliasTemplateDecl>( | |||
2438 | static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl()); | |||
2439 | } | |||
2440 | const TypeAliasTemplateDecl *getPreviousDecl() const { | |||
2441 | return cast_or_null<TypeAliasTemplateDecl>( | |||
2442 | static_cast<const RedeclarableTemplateDecl *>( | |||
2443 | this)->getPreviousDecl()); | |||
2444 | } | |||
2445 | ||||
2446 | TypeAliasTemplateDecl *getInstantiatedFromMemberTemplate() const { | |||
2447 | return cast_or_null<TypeAliasTemplateDecl>( | |||
2448 | RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate()); | |||
2449 | } | |||
2450 | ||||
2451 | /// Create a function template node. | |||
2452 | static TypeAliasTemplateDecl *Create(ASTContext &C, DeclContext *DC, | |||
2453 | SourceLocation L, | |||
2454 | DeclarationName Name, | |||
2455 | TemplateParameterList *Params, | |||
2456 | NamedDecl *Decl); | |||
2457 | ||||
2458 | /// Create an empty alias template node. | |||
2459 | static TypeAliasTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID); | |||
2460 | ||||
2461 | // Implement isa/cast/dyncast support | |||
2462 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
2463 | static bool classofKind(Kind K) { return K == TypeAliasTemplate; } | |||
2464 | }; | |||
2465 | ||||
2466 | /// Declaration of a function specialization at template class scope. | |||
2467 | /// | |||
2468 | /// For example: | |||
2469 | /// \code | |||
2470 | /// template <class T> | |||
2471 | /// class A { | |||
2472 | /// template <class U> void foo(U a) { } | |||
2473 | /// template<> void foo(int a) { } | |||
2474 | /// } | |||
2475 | /// \endcode | |||
2476 | /// | |||
2477 | /// "template<> foo(int a)" will be saved in Specialization as a normal | |||
2478 | /// CXXMethodDecl. Then during an instantiation of class A, it will be | |||
2479 | /// transformed into an actual function specialization. | |||
2480 | /// | |||
2481 | /// FIXME: This is redundant; we could store the same information directly on | |||
2482 | /// the CXXMethodDecl as a DependentFunctionTemplateSpecializationInfo. | |||
2483 | class ClassScopeFunctionSpecializationDecl : public Decl { | |||
2484 | CXXMethodDecl *Specialization; | |||
2485 | const ASTTemplateArgumentListInfo *TemplateArgs; | |||
2486 | ||||
2487 | ClassScopeFunctionSpecializationDecl( | |||
2488 | DeclContext *DC, SourceLocation Loc, CXXMethodDecl *FD, | |||
2489 | const ASTTemplateArgumentListInfo *TemplArgs) | |||
2490 | : Decl(Decl::ClassScopeFunctionSpecialization, DC, Loc), | |||
2491 | Specialization(FD), TemplateArgs(TemplArgs) {} | |||
2492 | ||||
2493 | ClassScopeFunctionSpecializationDecl(EmptyShell Empty) | |||
2494 | : Decl(Decl::ClassScopeFunctionSpecialization, Empty) {} | |||
2495 | ||||
2496 | virtual void anchor(); | |||
2497 | ||||
2498 | public: | |||
2499 | friend class ASTDeclReader; | |||
2500 | friend class ASTDeclWriter; | |||
2501 | ||||
2502 | CXXMethodDecl *getSpecialization() const { return Specialization; } | |||
2503 | bool hasExplicitTemplateArgs() const { return TemplateArgs; } | |||
2504 | const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const { | |||
2505 | return TemplateArgs; | |||
2506 | } | |||
2507 | ||||
2508 | static ClassScopeFunctionSpecializationDecl * | |||
2509 | Create(ASTContext &C, DeclContext *DC, SourceLocation Loc, CXXMethodDecl *FD, | |||
2510 | bool HasExplicitTemplateArgs, | |||
2511 | const TemplateArgumentListInfo &TemplateArgs) { | |||
2512 | return new (C, DC) ClassScopeFunctionSpecializationDecl( | |||
2513 | DC, Loc, FD, | |||
2514 | HasExplicitTemplateArgs | |||
2515 | ? ASTTemplateArgumentListInfo::Create(C, TemplateArgs) | |||
2516 | : nullptr); | |||
2517 | } | |||
2518 | ||||
2519 | static ClassScopeFunctionSpecializationDecl * | |||
2520 | CreateDeserialized(ASTContext &Context, unsigned ID); | |||
2521 | ||||
2522 | // Implement isa/cast/dyncast/etc. | |||
2523 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
2524 | ||||
2525 | static bool classofKind(Kind K) { | |||
2526 | return K == Decl::ClassScopeFunctionSpecialization; | |||
2527 | } | |||
2528 | }; | |||
2529 | ||||
2530 | /// Implementation of inline functions that require the template declarations | |||
2531 | inline AnyFunctionDecl::AnyFunctionDecl(FunctionTemplateDecl *FTD) | |||
2532 | : Function(FTD) {} | |||
2533 | ||||
2534 | /// Represents a variable template specialization, which refers to | |||
2535 | /// a variable template with a given set of template arguments. | |||
2536 | /// | |||
2537 | /// Variable template specializations represent both explicit | |||
2538 | /// specializations of variable templates, as in the example below, and | |||
2539 | /// implicit instantiations of variable templates. | |||
2540 | /// | |||
2541 | /// \code | |||
2542 | /// template<typename T> constexpr T pi = T(3.1415926535897932385); | |||
2543 | /// | |||
2544 | /// template<> | |||
2545 | /// constexpr float pi<float>; // variable template specialization pi<float> | |||
2546 | /// \endcode | |||
2547 | class VarTemplateSpecializationDecl : public VarDecl, | |||
2548 | public llvm::FoldingSetNode { | |||
2549 | ||||
2550 | /// Structure that stores information about a variable template | |||
2551 | /// specialization that was instantiated from a variable template partial | |||
2552 | /// specialization. | |||
2553 | struct SpecializedPartialSpecialization { | |||
2554 | /// The variable template partial specialization from which this | |||
2555 | /// variable template specialization was instantiated. | |||
2556 | VarTemplatePartialSpecializationDecl *PartialSpecialization; | |||
2557 | ||||
2558 | /// The template argument list deduced for the variable template | |||
2559 | /// partial specialization itself. | |||
2560 | const TemplateArgumentList *TemplateArgs; | |||
2561 | }; | |||
2562 | ||||
2563 | /// The template that this specialization specializes. | |||
2564 | llvm::PointerUnion<VarTemplateDecl *, SpecializedPartialSpecialization *> | |||
2565 | SpecializedTemplate; | |||
2566 | ||||
2567 | /// Further info for explicit template specialization/instantiation. | |||
2568 | struct ExplicitSpecializationInfo { | |||
2569 | /// The type-as-written. | |||
2570 | TypeSourceInfo *TypeAsWritten = nullptr; | |||
2571 | ||||
2572 | /// The location of the extern keyword. | |||
2573 | SourceLocation ExternLoc; | |||
2574 | ||||
2575 | /// The location of the template keyword. | |||
2576 | SourceLocation TemplateKeywordLoc; | |||
2577 | ||||
2578 | ExplicitSpecializationInfo() = default; | |||
2579 | }; | |||
2580 | ||||
2581 | /// Further info for explicit template specialization/instantiation. | |||
2582 | /// Does not apply to implicit specializations. | |||
2583 | ExplicitSpecializationInfo *ExplicitInfo = nullptr; | |||
2584 | ||||
2585 | /// The template arguments used to describe this specialization. | |||
2586 | const TemplateArgumentList *TemplateArgs; | |||
2587 | TemplateArgumentListInfo TemplateArgsInfo; | |||
2588 | ||||
2589 | /// The point where this template was instantiated (if any). | |||
2590 | SourceLocation PointOfInstantiation; | |||
2591 | ||||
2592 | /// The kind of specialization this declaration refers to. | |||
2593 | /// Really a value of type TemplateSpecializationKind. | |||
2594 | unsigned SpecializationKind : 3; | |||
2595 | ||||
2596 | /// Whether this declaration is a complete definition of the | |||
2597 | /// variable template specialization. We can't otherwise tell apart | |||
2598 | /// an instantiated declaration from an instantiated definition with | |||
2599 | /// no initializer. | |||
2600 | unsigned IsCompleteDefinition : 1; | |||
2601 | ||||
2602 | protected: | |||
2603 | VarTemplateSpecializationDecl(Kind DK, ASTContext &Context, DeclContext *DC, | |||
2604 | SourceLocation StartLoc, SourceLocation IdLoc, | |||
2605 | VarTemplateDecl *SpecializedTemplate, | |||
2606 | QualType T, TypeSourceInfo *TInfo, | |||
2607 | StorageClass S, | |||
2608 | ArrayRef<TemplateArgument> Args); | |||
2609 | ||||
2610 | explicit VarTemplateSpecializationDecl(Kind DK, ASTContext &Context); | |||
2611 | ||||
2612 | public: | |||
2613 | friend class ASTDeclReader; | |||
2614 | friend class ASTDeclWriter; | |||
2615 | friend class VarDecl; | |||
2616 | ||||
2617 | static VarTemplateSpecializationDecl * | |||
2618 | Create(ASTContext &Context, DeclContext *DC, SourceLocation StartLoc, | |||
2619 | SourceLocation IdLoc, VarTemplateDecl *SpecializedTemplate, QualType T, | |||
2620 | TypeSourceInfo *TInfo, StorageClass S, | |||
2621 | ArrayRef<TemplateArgument> Args); | |||
2622 | static VarTemplateSpecializationDecl *CreateDeserialized(ASTContext &C, | |||
2623 | unsigned ID); | |||
2624 | ||||
2625 | void getNameForDiagnostic(raw_ostream &OS, const PrintingPolicy &Policy, | |||
2626 | bool Qualified) const override; | |||
2627 | ||||
2628 | VarTemplateSpecializationDecl *getMostRecentDecl() { | |||
2629 | VarDecl *Recent = static_cast<VarDecl *>(this)->getMostRecentDecl(); | |||
2630 | return cast<VarTemplateSpecializationDecl>(Recent); | |||
2631 | } | |||
2632 | ||||
2633 | /// Retrieve the template that this specialization specializes. | |||
2634 | VarTemplateDecl *getSpecializedTemplate() const; | |||
2635 | ||||
2636 | /// Retrieve the template arguments of the variable template | |||
2637 | /// specialization. | |||
2638 | const TemplateArgumentList &getTemplateArgs() const { return *TemplateArgs; } | |||
2639 | ||||
2640 | // TODO: Always set this when creating the new specialization? | |||
2641 | void setTemplateArgsInfo(const TemplateArgumentListInfo &ArgsInfo); | |||
2642 | ||||
2643 | const TemplateArgumentListInfo &getTemplateArgsInfo() const { | |||
2644 | return TemplateArgsInfo; | |||
2645 | } | |||
2646 | ||||
2647 | /// Determine the kind of specialization that this | |||
2648 | /// declaration represents. | |||
2649 | TemplateSpecializationKind getSpecializationKind() const { | |||
2650 | return static_cast<TemplateSpecializationKind>(SpecializationKind); | |||
2651 | } | |||
2652 | ||||
2653 | bool isExplicitSpecialization() const { | |||
2654 | return getSpecializationKind() == TSK_ExplicitSpecialization; | |||
2655 | } | |||
2656 | ||||
2657 | bool isClassScopeExplicitSpecialization() const { | |||
2658 | return isExplicitSpecialization() && | |||
2659 | isa<CXXRecordDecl>(getLexicalDeclContext()); | |||
2660 | } | |||
2661 | ||||
2662 | /// True if this declaration is an explicit specialization, | |||
2663 | /// explicit instantiation declaration, or explicit instantiation | |||
2664 | /// definition. | |||
2665 | bool isExplicitInstantiationOrSpecialization() const { | |||
2666 | return isTemplateExplicitInstantiationOrSpecialization( | |||
2667 | getTemplateSpecializationKind()); | |||
2668 | } | |||
2669 | ||||
2670 | void setSpecializationKind(TemplateSpecializationKind TSK) { | |||
2671 | SpecializationKind = TSK; | |||
2672 | } | |||
2673 | ||||
2674 | /// Get the point of instantiation (if any), or null if none. | |||
2675 | SourceLocation getPointOfInstantiation() const { | |||
2676 | return PointOfInstantiation; | |||
2677 | } | |||
2678 | ||||
2679 | void setPointOfInstantiation(SourceLocation Loc) { | |||
2680 | assert(Loc.isValid() && "point of instantiation must be valid!")((Loc.isValid() && "point of instantiation must be valid!" ) ? static_cast<void> (0) : __assert_fail ("Loc.isValid() && \"point of instantiation must be valid!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2680, __PRETTY_FUNCTION__)); | |||
2681 | PointOfInstantiation = Loc; | |||
2682 | } | |||
2683 | ||||
2684 | void setCompleteDefinition() { IsCompleteDefinition = true; } | |||
2685 | ||||
2686 | /// If this variable template specialization is an instantiation of | |||
2687 | /// a template (rather than an explicit specialization), return the | |||
2688 | /// variable template or variable template partial specialization from which | |||
2689 | /// it was instantiated. | |||
2690 | llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *> | |||
2691 | getInstantiatedFrom() const { | |||
2692 | if (!isTemplateInstantiation(getSpecializationKind())) | |||
2693 | return llvm::PointerUnion<VarTemplateDecl *, | |||
2694 | VarTemplatePartialSpecializationDecl *>(); | |||
2695 | ||||
2696 | return getSpecializedTemplateOrPartial(); | |||
2697 | } | |||
2698 | ||||
2699 | /// Retrieve the variable template or variable template partial | |||
2700 | /// specialization which was specialized by this. | |||
2701 | llvm::PointerUnion<VarTemplateDecl *, VarTemplatePartialSpecializationDecl *> | |||
2702 | getSpecializedTemplateOrPartial() const { | |||
2703 | if (const auto *PartialSpec = | |||
2704 | SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>()) | |||
2705 | return PartialSpec->PartialSpecialization; | |||
2706 | ||||
2707 | return SpecializedTemplate.get<VarTemplateDecl *>(); | |||
2708 | } | |||
2709 | ||||
2710 | /// Retrieve the set of template arguments that should be used | |||
2711 | /// to instantiate the initializer of the variable template or variable | |||
2712 | /// template partial specialization from which this variable template | |||
2713 | /// specialization was instantiated. | |||
2714 | /// | |||
2715 | /// \returns For a variable template specialization instantiated from the | |||
2716 | /// primary template, this function will return the same template arguments | |||
2717 | /// as getTemplateArgs(). For a variable template specialization instantiated | |||
2718 | /// from a variable template partial specialization, this function will the | |||
2719 | /// return deduced template arguments for the variable template partial | |||
2720 | /// specialization itself. | |||
2721 | const TemplateArgumentList &getTemplateInstantiationArgs() const { | |||
2722 | if (const auto *PartialSpec = | |||
2723 | SpecializedTemplate.dyn_cast<SpecializedPartialSpecialization *>()) | |||
2724 | return *PartialSpec->TemplateArgs; | |||
2725 | ||||
2726 | return getTemplateArgs(); | |||
2727 | } | |||
2728 | ||||
2729 | /// Note that this variable template specialization is actually an | |||
2730 | /// instantiation of the given variable template partial specialization whose | |||
2731 | /// template arguments have been deduced. | |||
2732 | void setInstantiationOf(VarTemplatePartialSpecializationDecl *PartialSpec, | |||
2733 | const TemplateArgumentList *TemplateArgs) { | |||
2734 | assert(!SpecializedTemplate.is<SpecializedPartialSpecialization *>() &&((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Already set to a variable template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Already set to a variable template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2735, __PRETTY_FUNCTION__)) | |||
2735 | "Already set to a variable template partial specialization!")((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Already set to a variable template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Already set to a variable template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2735, __PRETTY_FUNCTION__)); | |||
2736 | auto *PS = new (getASTContext()) SpecializedPartialSpecialization(); | |||
2737 | PS->PartialSpecialization = PartialSpec; | |||
| ||||
2738 | PS->TemplateArgs = TemplateArgs; | |||
2739 | SpecializedTemplate = PS; | |||
2740 | } | |||
2741 | ||||
2742 | /// Note that this variable template specialization is an instantiation | |||
2743 | /// of the given variable template. | |||
2744 | void setInstantiationOf(VarTemplateDecl *TemplDecl) { | |||
2745 | assert(!SpecializedTemplate.is<SpecializedPartialSpecialization *>() &&((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Previously set to a variable template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Previously set to a variable template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2746, __PRETTY_FUNCTION__)) | |||
2746 | "Previously set to a variable template partial specialization!")((!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && "Previously set to a variable template partial specialization!" ) ? static_cast<void> (0) : __assert_fail ("!SpecializedTemplate.is<SpecializedPartialSpecialization *>() && \"Previously set to a variable template partial specialization!\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2746, __PRETTY_FUNCTION__)); | |||
2747 | SpecializedTemplate = TemplDecl; | |||
2748 | } | |||
2749 | ||||
2750 | /// Sets the type of this specialization as it was written by | |||
2751 | /// the user. | |||
2752 | void setTypeAsWritten(TypeSourceInfo *T) { | |||
2753 | if (!ExplicitInfo) | |||
2754 | ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo; | |||
2755 | ExplicitInfo->TypeAsWritten = T; | |||
2756 | } | |||
2757 | ||||
2758 | /// Gets the type of this specialization as it was written by | |||
2759 | /// the user, if it was so written. | |||
2760 | TypeSourceInfo *getTypeAsWritten() const { | |||
2761 | return ExplicitInfo ? ExplicitInfo->TypeAsWritten : nullptr; | |||
2762 | } | |||
2763 | ||||
2764 | /// Gets the location of the extern keyword, if present. | |||
2765 | SourceLocation getExternLoc() const { | |||
2766 | return ExplicitInfo ? ExplicitInfo->ExternLoc : SourceLocation(); | |||
2767 | } | |||
2768 | ||||
2769 | /// Sets the location of the extern keyword. | |||
2770 | void setExternLoc(SourceLocation Loc) { | |||
2771 | if (!ExplicitInfo) | |||
2772 | ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo; | |||
2773 | ExplicitInfo->ExternLoc = Loc; | |||
2774 | } | |||
2775 | ||||
2776 | /// Sets the location of the template keyword. | |||
2777 | void setTemplateKeywordLoc(SourceLocation Loc) { | |||
2778 | if (!ExplicitInfo) | |||
2779 | ExplicitInfo = new (getASTContext()) ExplicitSpecializationInfo; | |||
2780 | ExplicitInfo->TemplateKeywordLoc = Loc; | |||
2781 | } | |||
2782 | ||||
2783 | /// Gets the location of the template keyword, if present. | |||
2784 | SourceLocation getTemplateKeywordLoc() const { | |||
2785 | return ExplicitInfo ? ExplicitInfo->TemplateKeywordLoc : SourceLocation(); | |||
2786 | } | |||
2787 | ||||
2788 | void Profile(llvm::FoldingSetNodeID &ID) const { | |||
2789 | Profile(ID, TemplateArgs->asArray(), getASTContext()); | |||
2790 | } | |||
2791 | ||||
2792 | static void Profile(llvm::FoldingSetNodeID &ID, | |||
2793 | ArrayRef<TemplateArgument> TemplateArgs, | |||
2794 | ASTContext &Context) { | |||
2795 | ID.AddInteger(TemplateArgs.size()); | |||
2796 | for (const TemplateArgument &TemplateArg : TemplateArgs) | |||
2797 | TemplateArg.Profile(ID, Context); | |||
2798 | } | |||
2799 | ||||
2800 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
2801 | ||||
2802 | static bool classofKind(Kind K) { | |||
2803 | return K >= firstVarTemplateSpecialization && | |||
2804 | K <= lastVarTemplateSpecialization; | |||
2805 | } | |||
2806 | }; | |||
2807 | ||||
2808 | class VarTemplatePartialSpecializationDecl | |||
2809 | : public VarTemplateSpecializationDecl { | |||
2810 | /// The list of template parameters | |||
2811 | TemplateParameterList *TemplateParams = nullptr; | |||
2812 | ||||
2813 | /// The source info for the template arguments as written. | |||
2814 | /// FIXME: redundant with TypeAsWritten? | |||
2815 | const ASTTemplateArgumentListInfo *ArgsAsWritten = nullptr; | |||
2816 | ||||
2817 | /// The variable template partial specialization from which this | |||
2818 | /// variable template partial specialization was instantiated. | |||
2819 | /// | |||
2820 | /// The boolean value will be true to indicate that this variable template | |||
2821 | /// partial specialization was specialized at this level. | |||
2822 | llvm::PointerIntPair<VarTemplatePartialSpecializationDecl *, 1, bool> | |||
2823 | InstantiatedFromMember; | |||
2824 | ||||
2825 | VarTemplatePartialSpecializationDecl( | |||
2826 | ASTContext &Context, DeclContext *DC, SourceLocation StartLoc, | |||
2827 | SourceLocation IdLoc, TemplateParameterList *Params, | |||
2828 | VarTemplateDecl *SpecializedTemplate, QualType T, TypeSourceInfo *TInfo, | |||
2829 | StorageClass S, ArrayRef<TemplateArgument> Args, | |||
2830 | const ASTTemplateArgumentListInfo *ArgInfos); | |||
2831 | ||||
2832 | VarTemplatePartialSpecializationDecl(ASTContext &Context) | |||
2833 | : VarTemplateSpecializationDecl(VarTemplatePartialSpecialization, | |||
2834 | Context), | |||
2835 | InstantiatedFromMember(nullptr, false) {} | |||
2836 | ||||
2837 | void anchor() override; | |||
2838 | ||||
2839 | public: | |||
2840 | friend class ASTDeclReader; | |||
2841 | friend class ASTDeclWriter; | |||
2842 | ||||
2843 | static VarTemplatePartialSpecializationDecl * | |||
2844 | Create(ASTContext &Context, DeclContext *DC, SourceLocation StartLoc, | |||
2845 | SourceLocation IdLoc, TemplateParameterList *Params, | |||
2846 | VarTemplateDecl *SpecializedTemplate, QualType T, | |||
2847 | TypeSourceInfo *TInfo, StorageClass S, ArrayRef<TemplateArgument> Args, | |||
2848 | const TemplateArgumentListInfo &ArgInfos); | |||
2849 | ||||
2850 | static VarTemplatePartialSpecializationDecl *CreateDeserialized(ASTContext &C, | |||
2851 | unsigned ID); | |||
2852 | ||||
2853 | VarTemplatePartialSpecializationDecl *getMostRecentDecl() { | |||
2854 | return cast<VarTemplatePartialSpecializationDecl>( | |||
2855 | static_cast<VarTemplateSpecializationDecl *>( | |||
2856 | this)->getMostRecentDecl()); | |||
2857 | } | |||
2858 | ||||
2859 | /// Get the list of template parameters | |||
2860 | TemplateParameterList *getTemplateParameters() const { | |||
2861 | return TemplateParams; | |||
2862 | } | |||
2863 | ||||
2864 | /// Get the template arguments as written. | |||
2865 | const ASTTemplateArgumentListInfo *getTemplateArgsAsWritten() const { | |||
2866 | return ArgsAsWritten; | |||
2867 | } | |||
2868 | ||||
2869 | /// Retrieve the member variable template partial specialization from | |||
2870 | /// which this particular variable template partial specialization was | |||
2871 | /// instantiated. | |||
2872 | /// | |||
2873 | /// \code | |||
2874 | /// template<typename T> | |||
2875 | /// struct Outer { | |||
2876 | /// template<typename U> U Inner; | |||
2877 | /// template<typename U> U* Inner<U*> = (U*)(0); // #1 | |||
2878 | /// }; | |||
2879 | /// | |||
2880 | /// template int* Outer<float>::Inner<int*>; | |||
2881 | /// \endcode | |||
2882 | /// | |||
2883 | /// In this example, the instantiation of \c Outer<float>::Inner<int*> will | |||
2884 | /// end up instantiating the partial specialization | |||
2885 | /// \c Outer<float>::Inner<U*>, which itself was instantiated from the | |||
2886 | /// variable template partial specialization \c Outer<T>::Inner<U*>. Given | |||
2887 | /// \c Outer<float>::Inner<U*>, this function would return | |||
2888 | /// \c Outer<T>::Inner<U*>. | |||
2889 | VarTemplatePartialSpecializationDecl *getInstantiatedFromMember() const { | |||
2890 | const auto *First = | |||
2891 | cast<VarTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2892 | return First->InstantiatedFromMember.getPointer(); | |||
2893 | } | |||
2894 | ||||
2895 | void | |||
2896 | setInstantiatedFromMember(VarTemplatePartialSpecializationDecl *PartialSpec) { | |||
2897 | auto *First = cast<VarTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2898 | First->InstantiatedFromMember.setPointer(PartialSpec); | |||
2899 | } | |||
2900 | ||||
2901 | /// Determines whether this variable template partial specialization | |||
2902 | /// was a specialization of a member partial specialization. | |||
2903 | /// | |||
2904 | /// In the following example, the member template partial specialization | |||
2905 | /// \c X<int>::Inner<T*> is a member specialization. | |||
2906 | /// | |||
2907 | /// \code | |||
2908 | /// template<typename T> | |||
2909 | /// struct X { | |||
2910 | /// template<typename U> U Inner; | |||
2911 | /// template<typename U> U* Inner<U*> = (U*)(0); | |||
2912 | /// }; | |||
2913 | /// | |||
2914 | /// template<> template<typename T> | |||
2915 | /// U* X<int>::Inner<T*> = (T*)(0) + 1; | |||
2916 | /// \endcode | |||
2917 | bool isMemberSpecialization() { | |||
2918 | const auto *First = | |||
2919 | cast<VarTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2920 | return First->InstantiatedFromMember.getInt(); | |||
2921 | } | |||
2922 | ||||
2923 | /// Note that this member template is a specialization. | |||
2924 | void setMemberSpecialization() { | |||
2925 | auto *First = cast<VarTemplatePartialSpecializationDecl>(getFirstDecl()); | |||
2926 | assert(First->InstantiatedFromMember.getPointer() &&((First->InstantiatedFromMember.getPointer() && "Only member templates can be member template specializations" ) ? static_cast<void> (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2927, __PRETTY_FUNCTION__)) | |||
2927 | "Only member templates can be member template specializations")((First->InstantiatedFromMember.getPointer() && "Only member templates can be member template specializations" ) ? static_cast<void> (0) : __assert_fail ("First->InstantiatedFromMember.getPointer() && \"Only member templates can be member template specializations\"" , "/build/llvm-toolchain-snapshot-9~svn362543/tools/clang/include/clang/AST/DeclTemplate.h" , 2927, __PRETTY_FUNCTION__)); | |||
2928 | return First->InstantiatedFromMember.setInt(true); | |||
2929 | } | |||
2930 | ||||
2931 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
2932 | ||||
2933 | static bool classofKind(Kind K) { | |||
2934 | return K == VarTemplatePartialSpecialization; | |||
2935 | } | |||
2936 | }; | |||
2937 | ||||
2938 | /// Declaration of a variable template. | |||
2939 | class VarTemplateDecl : public RedeclarableTemplateDecl { | |||
2940 | protected: | |||
2941 | /// Data that is common to all of the declarations of a given | |||
2942 | /// variable template. | |||
2943 | struct Common : CommonBase { | |||
2944 | /// The variable template specializations for this variable | |||
2945 | /// template, including explicit specializations and instantiations. | |||
2946 | llvm::FoldingSetVector<VarTemplateSpecializationDecl> Specializations; | |||
2947 | ||||
2948 | /// The variable template partial specializations for this variable | |||
2949 | /// template. | |||
2950 | llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> | |||
2951 | PartialSpecializations; | |||
2952 | ||||
2953 | Common() = default; | |||
2954 | }; | |||
2955 | ||||
2956 | /// Retrieve the set of specializations of this variable template. | |||
2957 | llvm::FoldingSetVector<VarTemplateSpecializationDecl> & | |||
2958 | getSpecializations() const; | |||
2959 | ||||
2960 | /// Retrieve the set of partial specializations of this class | |||
2961 | /// template. | |||
2962 | llvm::FoldingSetVector<VarTemplatePartialSpecializationDecl> & | |||
2963 | getPartialSpecializations(); | |||
2964 | ||||
2965 | VarTemplateDecl(ASTContext &C, DeclContext *DC, SourceLocation L, | |||
2966 | DeclarationName Name, TemplateParameterList *Params, | |||
2967 | NamedDecl *Decl) | |||
2968 | : RedeclarableTemplateDecl(VarTemplate, C, DC, L, Name, Params, Decl) {} | |||
2969 | ||||
2970 | CommonBase *newCommon(ASTContext &C) const override; | |||
2971 | ||||
2972 | Common *getCommonPtr() const { | |||
2973 | return static_cast<Common *>(RedeclarableTemplateDecl::getCommonPtr()); | |||
2974 | } | |||
2975 | ||||
2976 | public: | |||
2977 | friend class ASTDeclReader; | |||
2978 | friend class ASTDeclWriter; | |||
2979 | ||||
2980 | /// Load any lazily-loaded specializations from the external source. | |||
2981 | void LoadLazySpecializations() const; | |||
2982 | ||||
2983 | /// Get the underlying variable declarations of the template. | |||
2984 | VarDecl *getTemplatedDecl() const { | |||
2985 | return static_cast<VarDecl *>(TemplatedDecl); | |||
2986 | } | |||
2987 | ||||
2988 | /// Returns whether this template declaration defines the primary | |||
2989 | /// variable pattern. | |||
2990 | bool isThisDeclarationADefinition() const { | |||
2991 | return getTemplatedDecl()->isThisDeclarationADefinition(); | |||
2992 | } | |||
2993 | ||||
2994 | VarTemplateDecl *getDefinition(); | |||
2995 | ||||
2996 | /// Create a variable template node. | |||
2997 | static VarTemplateDecl *Create(ASTContext &C, DeclContext *DC, | |||
2998 | SourceLocation L, DeclarationName Name, | |||
2999 | TemplateParameterList *Params, | |||
3000 | VarDecl *Decl); | |||
3001 | ||||
3002 | /// Create an empty variable template node. | |||
3003 | static VarTemplateDecl *CreateDeserialized(ASTContext &C, unsigned ID); | |||
3004 | ||||
3005 | /// Return the specialization with the provided arguments if it exists, | |||
3006 | /// otherwise return the insertion point. | |||
3007 | VarTemplateSpecializationDecl * | |||
3008 | findSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos); | |||
3009 | ||||
3010 | /// Insert the specified specialization knowing that it is not already | |||
3011 | /// in. InsertPos must be obtained from findSpecialization. | |||
3012 | void AddSpecialization(VarTemplateSpecializationDecl *D, void *InsertPos); | |||
3013 | ||||
3014 | VarTemplateDecl *getCanonicalDecl() override { | |||
3015 | return cast<VarTemplateDecl>(RedeclarableTemplateDecl::getCanonicalDecl()); | |||
3016 | } | |||
3017 | const VarTemplateDecl *getCanonicalDecl() const { | |||
3018 | return cast<VarTemplateDecl>(RedeclarableTemplateDecl::getCanonicalDecl()); | |||
3019 | } | |||
3020 | ||||
3021 | /// Retrieve the previous declaration of this variable template, or | |||
3022 | /// nullptr if no such declaration exists. | |||
3023 | VarTemplateDecl *getPreviousDecl() { | |||
3024 | return cast_or_null<VarTemplateDecl>( | |||
3025 | static_cast<RedeclarableTemplateDecl *>(this)->getPreviousDecl()); | |||
3026 | } | |||
3027 | const VarTemplateDecl *getPreviousDecl() const { | |||
3028 | return cast_or_null<VarTemplateDecl>( | |||
3029 | static_cast<const RedeclarableTemplateDecl *>( | |||
3030 | this)->getPreviousDecl()); | |||
3031 | } | |||
3032 | ||||
3033 | VarTemplateDecl *getMostRecentDecl() { | |||
3034 | return cast<VarTemplateDecl>( | |||
3035 | static_cast<RedeclarableTemplateDecl *>(this)->getMostRecentDecl()); | |||
3036 | } | |||
3037 | const VarTemplateDecl *getMostRecentDecl() const { | |||
3038 | return const_cast<VarTemplateDecl *>(this)->getMostRecentDecl(); | |||
3039 | } | |||
3040 | ||||
3041 | VarTemplateDecl *getInstantiatedFromMemberTemplate() const { | |||
3042 | return cast_or_null<VarTemplateDecl>( | |||
3043 | RedeclarableTemplateDecl::getInstantiatedFromMemberTemplate()); | |||
3044 | } | |||
3045 | ||||
3046 | /// Return the partial specialization with the provided arguments if it | |||
3047 | /// exists, otherwise return the insertion point. | |||
3048 | VarTemplatePartialSpecializationDecl * | |||
3049 | findPartialSpecialization(ArrayRef<TemplateArgument> Args, void *&InsertPos); | |||
3050 | ||||
3051 | /// Insert the specified partial specialization knowing that it is not | |||
3052 | /// already in. InsertPos must be obtained from findPartialSpecialization. | |||
3053 | void AddPartialSpecialization(VarTemplatePartialSpecializationDecl *D, | |||
3054 | void *InsertPos); | |||
3055 | ||||
3056 | /// Retrieve the partial specializations as an ordered list. | |||
3057 | void getPartialSpecializations( | |||
3058 | SmallVectorImpl<VarTemplatePartialSpecializationDecl *> &PS); | |||
3059 | ||||
3060 | /// Find a variable template partial specialization which was | |||
3061 | /// instantiated | |||
3062 | /// from the given member partial specialization. | |||
3063 | /// | |||
3064 | /// \param D a member variable template partial specialization. | |||
3065 | /// | |||
3066 | /// \returns the variable template partial specialization which was | |||
3067 | /// instantiated | |||
3068 | /// from the given member partial specialization, or nullptr if no such | |||
3069 | /// partial specialization exists. | |||
3070 | VarTemplatePartialSpecializationDecl *findPartialSpecInstantiatedFromMember( | |||
3071 | VarTemplatePartialSpecializationDecl *D); | |||
3072 | ||||
3073 | using spec_iterator = SpecIterator<VarTemplateSpecializationDecl>; | |||
3074 | using spec_range = llvm::iterator_range<spec_iterator>; | |||
3075 | ||||
3076 | spec_range specializations() const { | |||
3077 | return spec_range(spec_begin(), spec_end()); | |||
3078 | } | |||
3079 | ||||
3080 | spec_iterator spec_begin() const { | |||
3081 | return makeSpecIterator(getSpecializations(), false); | |||
3082 | } | |||
3083 | ||||
3084 | spec_iterator spec_end() const { | |||
3085 | return makeSpecIterator(getSpecializations(), true); | |||
3086 | } | |||
3087 | ||||
3088 | // Implement isa/cast/dyncast support | |||
3089 | static bool classof(const Decl *D) { return classofKind(D->getKind()); } | |||
3090 | static bool classofKind(Kind K) { return K == VarTemplate; } | |||
3091 | }; | |||
3092 | ||||
3093 | inline NamedDecl *getAsNamedDecl(TemplateParameter P) { | |||
3094 | if (auto *PD = P.dyn_cast<TemplateTypeParmDecl *>()) | |||
3095 | return PD; | |||
3096 | if (auto *PD = P.dyn_cast<NonTypeTemplateParmDecl *>()) | |||
3097 | return PD; | |||
3098 | return P.get<TemplateTemplateParmDecl *>(); | |||
3099 | } | |||
3100 | ||||
3101 | inline TemplateDecl *getAsTypeTemplateDecl(Decl *D) { | |||
3102 | auto *TD = dyn_cast<TemplateDecl>(D); | |||
3103 | return TD && (isa<ClassTemplateDecl>(TD) || | |||
3104 | isa<ClassTemplatePartialSpecializationDecl>(TD) || | |||
3105 | isa<TypeAliasTemplateDecl>(TD) || | |||
3106 | isa<TemplateTemplateParmDecl>(TD)) | |||
3107 | ? TD | |||
3108 | : nullptr; | |||
3109 | } | |||
3110 | ||||
3111 | } // namespace clang | |||
3112 | ||||
3113 | #endif // LLVM_CLANG_AST_DECLTEMPLATE_H |