| File: | build/source/clang/lib/Sema/SemaTemplate.cpp |
| Warning: | line 1407, column 5 Value stored to 'RD' is never read |
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| 1 | //===------- SemaTemplate.cpp - Semantic Analysis for C++ Templates -------===// |
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | //===----------------------------------------------------------------------===// |
| 7 | // |
| 8 | // This file implements semantic analysis for C++ templates. |
| 9 | //===----------------------------------------------------------------------===// |
| 10 | |
| 11 | #include "TreeTransform.h" |
| 12 | #include "clang/AST/ASTConsumer.h" |
| 13 | #include "clang/AST/ASTContext.h" |
| 14 | #include "clang/AST/Decl.h" |
| 15 | #include "clang/AST/DeclFriend.h" |
| 16 | #include "clang/AST/DeclTemplate.h" |
| 17 | #include "clang/AST/Expr.h" |
| 18 | #include "clang/AST/ExprCXX.h" |
| 19 | #include "clang/AST/RecursiveASTVisitor.h" |
| 20 | #include "clang/AST/TemplateName.h" |
| 21 | #include "clang/AST/TypeVisitor.h" |
| 22 | #include "clang/Basic/Builtins.h" |
| 23 | #include "clang/Basic/DiagnosticSema.h" |
| 24 | #include "clang/Basic/LangOptions.h" |
| 25 | #include "clang/Basic/PartialDiagnostic.h" |
| 26 | #include "clang/Basic/Stack.h" |
| 27 | #include "clang/Basic/TargetInfo.h" |
| 28 | #include "clang/Sema/DeclSpec.h" |
| 29 | #include "clang/Sema/Initialization.h" |
| 30 | #include "clang/Sema/Lookup.h" |
| 31 | #include "clang/Sema/Overload.h" |
| 32 | #include "clang/Sema/ParsedTemplate.h" |
| 33 | #include "clang/Sema/Scope.h" |
| 34 | #include "clang/Sema/SemaInternal.h" |
| 35 | #include "clang/Sema/Template.h" |
| 36 | #include "clang/Sema/TemplateDeduction.h" |
| 37 | #include "llvm/ADT/SmallBitVector.h" |
| 38 | #include "llvm/ADT/SmallString.h" |
| 39 | #include "llvm/ADT/StringExtras.h" |
| 40 | |
| 41 | #include <iterator> |
| 42 | #include <optional> |
| 43 | using namespace clang; |
| 44 | using namespace sema; |
| 45 | |
| 46 | // Exported for use by Parser. |
| 47 | SourceRange |
| 48 | clang::getTemplateParamsRange(TemplateParameterList const * const *Ps, |
| 49 | unsigned N) { |
| 50 | if (!N) return SourceRange(); |
| 51 | return SourceRange(Ps[0]->getTemplateLoc(), Ps[N-1]->getRAngleLoc()); |
| 52 | } |
| 53 | |
| 54 | unsigned Sema::getTemplateDepth(Scope *S) const { |
| 55 | unsigned Depth = 0; |
| 56 | |
| 57 | // Each template parameter scope represents one level of template parameter |
| 58 | // depth. |
| 59 | for (Scope *TempParamScope = S->getTemplateParamParent(); TempParamScope; |
| 60 | TempParamScope = TempParamScope->getParent()->getTemplateParamParent()) { |
| 61 | ++Depth; |
| 62 | } |
| 63 | |
| 64 | // Note that there are template parameters with the given depth. |
| 65 | auto ParamsAtDepth = [&](unsigned D) { Depth = std::max(Depth, D + 1); }; |
| 66 | |
| 67 | // Look for parameters of an enclosing generic lambda. We don't create a |
| 68 | // template parameter scope for these. |
| 69 | for (FunctionScopeInfo *FSI : getFunctionScopes()) { |
| 70 | if (auto *LSI = dyn_cast<LambdaScopeInfo>(FSI)) { |
| 71 | if (!LSI->TemplateParams.empty()) { |
| 72 | ParamsAtDepth(LSI->AutoTemplateParameterDepth); |
| 73 | break; |
| 74 | } |
| 75 | if (LSI->GLTemplateParameterList) { |
| 76 | ParamsAtDepth(LSI->GLTemplateParameterList->getDepth()); |
| 77 | break; |
| 78 | } |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | // Look for parameters of an enclosing terse function template. We don't |
| 83 | // create a template parameter scope for these either. |
| 84 | for (const InventedTemplateParameterInfo &Info : |
| 85 | getInventedParameterInfos()) { |
| 86 | if (!Info.TemplateParams.empty()) { |
| 87 | ParamsAtDepth(Info.AutoTemplateParameterDepth); |
| 88 | break; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | return Depth; |
| 93 | } |
| 94 | |
| 95 | /// \brief Determine whether the declaration found is acceptable as the name |
| 96 | /// of a template and, if so, return that template declaration. Otherwise, |
| 97 | /// returns null. |
| 98 | /// |
| 99 | /// Note that this may return an UnresolvedUsingValueDecl if AllowDependent |
| 100 | /// is true. In all other cases it will return a TemplateDecl (or null). |
| 101 | NamedDecl *Sema::getAsTemplateNameDecl(NamedDecl *D, |
| 102 | bool AllowFunctionTemplates, |
| 103 | bool AllowDependent) { |
| 104 | D = D->getUnderlyingDecl(); |
| 105 | |
| 106 | if (isa<TemplateDecl>(D)) { |
| 107 | if (!AllowFunctionTemplates && isa<FunctionTemplateDecl>(D)) |
| 108 | return nullptr; |
| 109 | |
| 110 | return D; |
| 111 | } |
| 112 | |
| 113 | if (const auto *Record = dyn_cast<CXXRecordDecl>(D)) { |
| 114 | // C++ [temp.local]p1: |
| 115 | // Like normal (non-template) classes, class templates have an |
| 116 | // injected-class-name (Clause 9). The injected-class-name |
| 117 | // can be used with or without a template-argument-list. When |
| 118 | // it is used without a template-argument-list, it is |
| 119 | // equivalent to the injected-class-name followed by the |
| 120 | // template-parameters of the class template enclosed in |
| 121 | // <>. When it is used with a template-argument-list, it |
| 122 | // refers to the specified class template specialization, |
| 123 | // which could be the current specialization or another |
| 124 | // specialization. |
| 125 | if (Record->isInjectedClassName()) { |
| 126 | Record = cast<CXXRecordDecl>(Record->getDeclContext()); |
| 127 | if (Record->getDescribedClassTemplate()) |
| 128 | return Record->getDescribedClassTemplate(); |
| 129 | |
| 130 | if (const auto *Spec = dyn_cast<ClassTemplateSpecializationDecl>(Record)) |
| 131 | return Spec->getSpecializedTemplate(); |
| 132 | } |
| 133 | |
| 134 | return nullptr; |
| 135 | } |
| 136 | |
| 137 | // 'using Dependent::foo;' can resolve to a template name. |
| 138 | // 'using typename Dependent::foo;' cannot (not even if 'foo' is an |
| 139 | // injected-class-name). |
| 140 | if (AllowDependent && isa<UnresolvedUsingValueDecl>(D)) |
| 141 | return D; |
| 142 | |
| 143 | return nullptr; |
| 144 | } |
| 145 | |
| 146 | void Sema::FilterAcceptableTemplateNames(LookupResult &R, |
| 147 | bool AllowFunctionTemplates, |
| 148 | bool AllowDependent) { |
| 149 | LookupResult::Filter filter = R.makeFilter(); |
| 150 | while (filter.hasNext()) { |
| 151 | NamedDecl *Orig = filter.next(); |
| 152 | if (!getAsTemplateNameDecl(Orig, AllowFunctionTemplates, AllowDependent)) |
| 153 | filter.erase(); |
| 154 | } |
| 155 | filter.done(); |
| 156 | } |
| 157 | |
| 158 | bool Sema::hasAnyAcceptableTemplateNames(LookupResult &R, |
| 159 | bool AllowFunctionTemplates, |
| 160 | bool AllowDependent, |
| 161 | bool AllowNonTemplateFunctions) { |
| 162 | for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { |
| 163 | if (getAsTemplateNameDecl(*I, AllowFunctionTemplates, AllowDependent)) |
| 164 | return true; |
| 165 | if (AllowNonTemplateFunctions && |
| 166 | isa<FunctionDecl>((*I)->getUnderlyingDecl())) |
| 167 | return true; |
| 168 | } |
| 169 | |
| 170 | return false; |
| 171 | } |
| 172 | |
| 173 | TemplateNameKind Sema::isTemplateName(Scope *S, |
| 174 | CXXScopeSpec &SS, |
| 175 | bool hasTemplateKeyword, |
| 176 | const UnqualifiedId &Name, |
| 177 | ParsedType ObjectTypePtr, |
| 178 | bool EnteringContext, |
| 179 | TemplateTy &TemplateResult, |
| 180 | bool &MemberOfUnknownSpecialization, |
| 181 | bool Disambiguation) { |
| 182 | assert(getLangOpts().CPlusPlus && "No template names in C!")(static_cast <bool> (getLangOpts().CPlusPlus && "No template names in C!") ? void (0) : __assert_fail ("getLangOpts().CPlusPlus && \"No template names in C!\"" , "clang/lib/Sema/SemaTemplate.cpp", 182, __extension__ __PRETTY_FUNCTION__ )); |
| 183 | |
| 184 | DeclarationName TName; |
| 185 | MemberOfUnknownSpecialization = false; |
| 186 | |
| 187 | switch (Name.getKind()) { |
| 188 | case UnqualifiedIdKind::IK_Identifier: |
| 189 | TName = DeclarationName(Name.Identifier); |
| 190 | break; |
| 191 | |
| 192 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
| 193 | TName = Context.DeclarationNames.getCXXOperatorName( |
| 194 | Name.OperatorFunctionId.Operator); |
| 195 | break; |
| 196 | |
| 197 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
| 198 | TName = Context.DeclarationNames.getCXXLiteralOperatorName(Name.Identifier); |
| 199 | break; |
| 200 | |
| 201 | default: |
| 202 | return TNK_Non_template; |
| 203 | } |
| 204 | |
| 205 | QualType ObjectType = ObjectTypePtr.get(); |
| 206 | |
| 207 | AssumedTemplateKind AssumedTemplate; |
| 208 | LookupResult R(*this, TName, Name.getBeginLoc(), LookupOrdinaryName); |
| 209 | if (LookupTemplateName(R, S, SS, ObjectType, EnteringContext, |
| 210 | MemberOfUnknownSpecialization, SourceLocation(), |
| 211 | &AssumedTemplate, |
| 212 | /*AllowTypoCorrection=*/!Disambiguation)) |
| 213 | return TNK_Non_template; |
| 214 | |
| 215 | if (AssumedTemplate != AssumedTemplateKind::None) { |
| 216 | TemplateResult = TemplateTy::make(Context.getAssumedTemplateName(TName)); |
| 217 | // Let the parser know whether we found nothing or found functions; if we |
| 218 | // found nothing, we want to more carefully check whether this is actually |
| 219 | // a function template name versus some other kind of undeclared identifier. |
| 220 | return AssumedTemplate == AssumedTemplateKind::FoundNothing |
| 221 | ? TNK_Undeclared_template |
| 222 | : TNK_Function_template; |
| 223 | } |
| 224 | |
| 225 | if (R.empty()) |
| 226 | return TNK_Non_template; |
| 227 | |
| 228 | NamedDecl *D = nullptr; |
| 229 | UsingShadowDecl *FoundUsingShadow = dyn_cast<UsingShadowDecl>(*R.begin()); |
| 230 | if (R.isAmbiguous()) { |
| 231 | // If we got an ambiguity involving a non-function template, treat this |
| 232 | // as a template name, and pick an arbitrary template for error recovery. |
| 233 | bool AnyFunctionTemplates = false; |
| 234 | for (NamedDecl *FoundD : R) { |
| 235 | if (NamedDecl *FoundTemplate = getAsTemplateNameDecl(FoundD)) { |
| 236 | if (isa<FunctionTemplateDecl>(FoundTemplate)) |
| 237 | AnyFunctionTemplates = true; |
| 238 | else { |
| 239 | D = FoundTemplate; |
| 240 | FoundUsingShadow = dyn_cast<UsingShadowDecl>(FoundD); |
| 241 | break; |
| 242 | } |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | // If we didn't find any templates at all, this isn't a template name. |
| 247 | // Leave the ambiguity for a later lookup to diagnose. |
| 248 | if (!D && !AnyFunctionTemplates) { |
| 249 | R.suppressDiagnostics(); |
| 250 | return TNK_Non_template; |
| 251 | } |
| 252 | |
| 253 | // If the only templates were function templates, filter out the rest. |
| 254 | // We'll diagnose the ambiguity later. |
| 255 | if (!D) |
| 256 | FilterAcceptableTemplateNames(R); |
| 257 | } |
| 258 | |
| 259 | // At this point, we have either picked a single template name declaration D |
| 260 | // or we have a non-empty set of results R containing either one template name |
| 261 | // declaration or a set of function templates. |
| 262 | |
| 263 | TemplateName Template; |
| 264 | TemplateNameKind TemplateKind; |
| 265 | |
| 266 | unsigned ResultCount = R.end() - R.begin(); |
| 267 | if (!D && ResultCount > 1) { |
| 268 | // We assume that we'll preserve the qualifier from a function |
| 269 | // template name in other ways. |
| 270 | Template = Context.getOverloadedTemplateName(R.begin(), R.end()); |
| 271 | TemplateKind = TNK_Function_template; |
| 272 | |
| 273 | // We'll do this lookup again later. |
| 274 | R.suppressDiagnostics(); |
| 275 | } else { |
| 276 | if (!D) { |
| 277 | D = getAsTemplateNameDecl(*R.begin()); |
| 278 | assert(D && "unambiguous result is not a template name")(static_cast <bool> (D && "unambiguous result is not a template name" ) ? void (0) : __assert_fail ("D && \"unambiguous result is not a template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 278, __extension__ __PRETTY_FUNCTION__ )); |
| 279 | } |
| 280 | |
| 281 | if (isa<UnresolvedUsingValueDecl>(D)) { |
| 282 | // We don't yet know whether this is a template-name or not. |
| 283 | MemberOfUnknownSpecialization = true; |
| 284 | return TNK_Non_template; |
| 285 | } |
| 286 | |
| 287 | TemplateDecl *TD = cast<TemplateDecl>(D); |
| 288 | Template = |
| 289 | FoundUsingShadow ? TemplateName(FoundUsingShadow) : TemplateName(TD); |
| 290 | assert(!FoundUsingShadow || FoundUsingShadow->getTargetDecl() == TD)(static_cast <bool> (!FoundUsingShadow || FoundUsingShadow ->getTargetDecl() == TD) ? void (0) : __assert_fail ("!FoundUsingShadow || FoundUsingShadow->getTargetDecl() == TD" , "clang/lib/Sema/SemaTemplate.cpp", 290, __extension__ __PRETTY_FUNCTION__ )); |
| 291 | if (SS.isSet() && !SS.isInvalid()) { |
| 292 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); |
| 293 | Template = Context.getQualifiedTemplateName(Qualifier, hasTemplateKeyword, |
| 294 | Template); |
| 295 | } |
| 296 | |
| 297 | if (isa<FunctionTemplateDecl>(TD)) { |
| 298 | TemplateKind = TNK_Function_template; |
| 299 | |
| 300 | // We'll do this lookup again later. |
| 301 | R.suppressDiagnostics(); |
| 302 | } else { |
| 303 | assert(isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) ||(static_cast <bool> (isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl >(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl >(TD) || isa<ConceptDecl>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)" , "clang/lib/Sema/SemaTemplate.cpp", 305, __extension__ __PRETTY_FUNCTION__ )) |
| 304 | isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) ||(static_cast <bool> (isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl >(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl >(TD) || isa<ConceptDecl>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)" , "clang/lib/Sema/SemaTemplate.cpp", 305, __extension__ __PRETTY_FUNCTION__ )) |
| 305 | isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD))(static_cast <bool> (isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl >(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl >(TD) || isa<ConceptDecl>(TD)) ? void (0) : __assert_fail ("isa<ClassTemplateDecl>(TD) || isa<TemplateTemplateParmDecl>(TD) || isa<TypeAliasTemplateDecl>(TD) || isa<VarTemplateDecl>(TD) || isa<BuiltinTemplateDecl>(TD) || isa<ConceptDecl>(TD)" , "clang/lib/Sema/SemaTemplate.cpp", 305, __extension__ __PRETTY_FUNCTION__ )); |
| 306 | TemplateKind = |
| 307 | isa<VarTemplateDecl>(TD) ? TNK_Var_template : |
| 308 | isa<ConceptDecl>(TD) ? TNK_Concept_template : |
| 309 | TNK_Type_template; |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | TemplateResult = TemplateTy::make(Template); |
| 314 | return TemplateKind; |
| 315 | } |
| 316 | |
| 317 | bool Sema::isDeductionGuideName(Scope *S, const IdentifierInfo &Name, |
| 318 | SourceLocation NameLoc, |
| 319 | ParsedTemplateTy *Template) { |
| 320 | CXXScopeSpec SS; |
| 321 | bool MemberOfUnknownSpecialization = false; |
| 322 | |
| 323 | // We could use redeclaration lookup here, but we don't need to: the |
| 324 | // syntactic form of a deduction guide is enough to identify it even |
| 325 | // if we can't look up the template name at all. |
| 326 | LookupResult R(*this, DeclarationName(&Name), NameLoc, LookupOrdinaryName); |
| 327 | if (LookupTemplateName(R, S, SS, /*ObjectType*/ QualType(), |
| 328 | /*EnteringContext*/ false, |
| 329 | MemberOfUnknownSpecialization)) |
| 330 | return false; |
| 331 | |
| 332 | if (R.empty()) return false; |
| 333 | if (R.isAmbiguous()) { |
| 334 | // FIXME: Diagnose an ambiguity if we find at least one template. |
| 335 | R.suppressDiagnostics(); |
| 336 | return false; |
| 337 | } |
| 338 | |
| 339 | // We only treat template-names that name type templates as valid deduction |
| 340 | // guide names. |
| 341 | TemplateDecl *TD = R.getAsSingle<TemplateDecl>(); |
| 342 | if (!TD || !getAsTypeTemplateDecl(TD)) |
| 343 | return false; |
| 344 | |
| 345 | if (Template) |
| 346 | *Template = TemplateTy::make(TemplateName(TD)); |
| 347 | return true; |
| 348 | } |
| 349 | |
| 350 | bool Sema::DiagnoseUnknownTemplateName(const IdentifierInfo &II, |
| 351 | SourceLocation IILoc, |
| 352 | Scope *S, |
| 353 | const CXXScopeSpec *SS, |
| 354 | TemplateTy &SuggestedTemplate, |
| 355 | TemplateNameKind &SuggestedKind) { |
| 356 | // We can't recover unless there's a dependent scope specifier preceding the |
| 357 | // template name. |
| 358 | // FIXME: Typo correction? |
| 359 | if (!SS || !SS->isSet() || !isDependentScopeSpecifier(*SS) || |
| 360 | computeDeclContext(*SS)) |
| 361 | return false; |
| 362 | |
| 363 | // The code is missing a 'template' keyword prior to the dependent template |
| 364 | // name. |
| 365 | NestedNameSpecifier *Qualifier = (NestedNameSpecifier*)SS->getScopeRep(); |
| 366 | Diag(IILoc, diag::err_template_kw_missing) |
| 367 | << Qualifier << II.getName() |
| 368 | << FixItHint::CreateInsertion(IILoc, "template "); |
| 369 | SuggestedTemplate |
| 370 | = TemplateTy::make(Context.getDependentTemplateName(Qualifier, &II)); |
| 371 | SuggestedKind = TNK_Dependent_template_name; |
| 372 | return true; |
| 373 | } |
| 374 | |
| 375 | bool Sema::LookupTemplateName(LookupResult &Found, |
| 376 | Scope *S, CXXScopeSpec &SS, |
| 377 | QualType ObjectType, |
| 378 | bool EnteringContext, |
| 379 | bool &MemberOfUnknownSpecialization, |
| 380 | RequiredTemplateKind RequiredTemplate, |
| 381 | AssumedTemplateKind *ATK, |
| 382 | bool AllowTypoCorrection) { |
| 383 | if (ATK) |
| 384 | *ATK = AssumedTemplateKind::None; |
| 385 | |
| 386 | if (SS.isInvalid()) |
| 387 | return true; |
| 388 | |
| 389 | Found.setTemplateNameLookup(true); |
| 390 | |
| 391 | // Determine where to perform name lookup |
| 392 | MemberOfUnknownSpecialization = false; |
| 393 | DeclContext *LookupCtx = nullptr; |
| 394 | bool IsDependent = false; |
| 395 | if (!ObjectType.isNull()) { |
| 396 | // This nested-name-specifier occurs in a member access expression, e.g., |
| 397 | // x->B::f, and we are looking into the type of the object. |
| 398 | assert(SS.isEmpty() && "ObjectType and scope specifier cannot coexist")(static_cast <bool> (SS.isEmpty() && "ObjectType and scope specifier cannot coexist" ) ? void (0) : __assert_fail ("SS.isEmpty() && \"ObjectType and scope specifier cannot coexist\"" , "clang/lib/Sema/SemaTemplate.cpp", 398, __extension__ __PRETTY_FUNCTION__ )); |
| 399 | LookupCtx = computeDeclContext(ObjectType); |
| 400 | IsDependent = !LookupCtx && ObjectType->isDependentType(); |
| 401 | assert((IsDependent || !ObjectType->isIncompleteType() ||(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )) |
| 402 | !ObjectType->getAs<TagType>() ||(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )) |
| 403 | ObjectType->castAs<TagType>()->isBeingDefined()) &&(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )) |
| 404 | "Caller should have completed object type")(static_cast <bool> ((IsDependent || !ObjectType->isIncompleteType () || !ObjectType->getAs<TagType>() || ObjectType-> castAs<TagType>()->isBeingDefined()) && "Caller should have completed object type" ) ? void (0) : __assert_fail ("(IsDependent || !ObjectType->isIncompleteType() || !ObjectType->getAs<TagType>() || ObjectType->castAs<TagType>()->isBeingDefined()) && \"Caller should have completed object type\"" , "clang/lib/Sema/SemaTemplate.cpp", 404, __extension__ __PRETTY_FUNCTION__ )); |
| 405 | |
| 406 | // Template names cannot appear inside an Objective-C class or object type |
| 407 | // or a vector type. |
| 408 | // |
| 409 | // FIXME: This is wrong. For example: |
| 410 | // |
| 411 | // template<typename T> using Vec = T __attribute__((ext_vector_type(4))); |
| 412 | // Vec<int> vi; |
| 413 | // vi.Vec<int>::~Vec<int>(); |
| 414 | // |
| 415 | // ... should be accepted but we will not treat 'Vec' as a template name |
| 416 | // here. The right thing to do would be to check if the name is a valid |
| 417 | // vector component name, and look up a template name if not. And similarly |
| 418 | // for lookups into Objective-C class and object types, where the same |
| 419 | // problem can arise. |
| 420 | if (ObjectType->isObjCObjectOrInterfaceType() || |
| 421 | ObjectType->isVectorType()) { |
| 422 | Found.clear(); |
| 423 | return false; |
| 424 | } |
| 425 | } else if (SS.isNotEmpty()) { |
| 426 | // This nested-name-specifier occurs after another nested-name-specifier, |
| 427 | // so long into the context associated with the prior nested-name-specifier. |
| 428 | LookupCtx = computeDeclContext(SS, EnteringContext); |
| 429 | IsDependent = !LookupCtx && isDependentScopeSpecifier(SS); |
| 430 | |
| 431 | // The declaration context must be complete. |
| 432 | if (LookupCtx && RequireCompleteDeclContext(SS, LookupCtx)) |
| 433 | return true; |
| 434 | } |
| 435 | |
| 436 | bool ObjectTypeSearchedInScope = false; |
| 437 | bool AllowFunctionTemplatesInLookup = true; |
| 438 | if (LookupCtx) { |
| 439 | // Perform "qualified" name lookup into the declaration context we |
| 440 | // computed, which is either the type of the base of a member access |
| 441 | // expression or the declaration context associated with a prior |
| 442 | // nested-name-specifier. |
| 443 | LookupQualifiedName(Found, LookupCtx); |
| 444 | |
| 445 | // FIXME: The C++ standard does not clearly specify what happens in the |
| 446 | // case where the object type is dependent, and implementations vary. In |
| 447 | // Clang, we treat a name after a . or -> as a template-name if lookup |
| 448 | // finds a non-dependent member or member of the current instantiation that |
| 449 | // is a type template, or finds no such members and lookup in the context |
| 450 | // of the postfix-expression finds a type template. In the latter case, the |
| 451 | // name is nonetheless dependent, and we may resolve it to a member of an |
| 452 | // unknown specialization when we come to instantiate the template. |
| 453 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); |
| 454 | } |
| 455 | |
| 456 | if (SS.isEmpty() && (ObjectType.isNull() || Found.empty())) { |
| 457 | // C++ [basic.lookup.classref]p1: |
| 458 | // In a class member access expression (5.2.5), if the . or -> token is |
| 459 | // immediately followed by an identifier followed by a <, the |
| 460 | // identifier must be looked up to determine whether the < is the |
| 461 | // beginning of a template argument list (14.2) or a less-than operator. |
| 462 | // The identifier is first looked up in the class of the object |
| 463 | // expression. If the identifier is not found, it is then looked up in |
| 464 | // the context of the entire postfix-expression and shall name a class |
| 465 | // template. |
| 466 | if (S) |
| 467 | LookupName(Found, S); |
| 468 | |
| 469 | if (!ObjectType.isNull()) { |
| 470 | // FIXME: We should filter out all non-type templates here, particularly |
| 471 | // variable templates and concepts. But the exclusion of alias templates |
| 472 | // and template template parameters is a wording defect. |
| 473 | AllowFunctionTemplatesInLookup = false; |
| 474 | ObjectTypeSearchedInScope = true; |
| 475 | } |
| 476 | |
| 477 | IsDependent |= Found.wasNotFoundInCurrentInstantiation(); |
| 478 | } |
| 479 | |
| 480 | if (Found.isAmbiguous()) |
| 481 | return false; |
| 482 | |
| 483 | if (ATK && SS.isEmpty() && ObjectType.isNull() && |
| 484 | !RequiredTemplate.hasTemplateKeyword()) { |
| 485 | // C++2a [temp.names]p2: |
| 486 | // A name is also considered to refer to a template if it is an |
| 487 | // unqualified-id followed by a < and name lookup finds either one or more |
| 488 | // functions or finds nothing. |
| 489 | // |
| 490 | // To keep our behavior consistent, we apply the "finds nothing" part in |
| 491 | // all language modes, and diagnose the empty lookup in ActOnCallExpr if we |
| 492 | // successfully form a call to an undeclared template-id. |
| 493 | bool AllFunctions = |
| 494 | getLangOpts().CPlusPlus20 && llvm::all_of(Found, [](NamedDecl *ND) { |
| 495 | return isa<FunctionDecl>(ND->getUnderlyingDecl()); |
| 496 | }); |
| 497 | if (AllFunctions || (Found.empty() && !IsDependent)) { |
| 498 | // If lookup found any functions, or if this is a name that can only be |
| 499 | // used for a function, then strongly assume this is a function |
| 500 | // template-id. |
| 501 | *ATK = (Found.empty() && Found.getLookupName().isIdentifier()) |
| 502 | ? AssumedTemplateKind::FoundNothing |
| 503 | : AssumedTemplateKind::FoundFunctions; |
| 504 | Found.clear(); |
| 505 | return false; |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | if (Found.empty() && !IsDependent && AllowTypoCorrection) { |
| 510 | // If we did not find any names, and this is not a disambiguation, attempt |
| 511 | // to correct any typos. |
| 512 | DeclarationName Name = Found.getLookupName(); |
| 513 | Found.clear(); |
| 514 | // Simple filter callback that, for keywords, only accepts the C++ *_cast |
| 515 | DefaultFilterCCC FilterCCC{}; |
| 516 | FilterCCC.WantTypeSpecifiers = false; |
| 517 | FilterCCC.WantExpressionKeywords = false; |
| 518 | FilterCCC.WantRemainingKeywords = false; |
| 519 | FilterCCC.WantCXXNamedCasts = true; |
| 520 | if (TypoCorrection Corrected = |
| 521 | CorrectTypo(Found.getLookupNameInfo(), Found.getLookupKind(), S, |
| 522 | &SS, FilterCCC, CTK_ErrorRecovery, LookupCtx)) { |
| 523 | if (auto *ND = Corrected.getFoundDecl()) |
| 524 | Found.addDecl(ND); |
| 525 | FilterAcceptableTemplateNames(Found); |
| 526 | if (Found.isAmbiguous()) { |
| 527 | Found.clear(); |
| 528 | } else if (!Found.empty()) { |
| 529 | Found.setLookupName(Corrected.getCorrection()); |
| 530 | if (LookupCtx) { |
| 531 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); |
| 532 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
| 533 | Name.getAsString() == CorrectedStr; |
| 534 | diagnoseTypo(Corrected, PDiag(diag::err_no_member_template_suggest) |
| 535 | << Name << LookupCtx << DroppedSpecifier |
| 536 | << SS.getRange()); |
| 537 | } else { |
| 538 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) << Name); |
| 539 | } |
| 540 | } |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | NamedDecl *ExampleLookupResult = |
| 545 | Found.empty() ? nullptr : Found.getRepresentativeDecl(); |
| 546 | FilterAcceptableTemplateNames(Found, AllowFunctionTemplatesInLookup); |
| 547 | if (Found.empty()) { |
| 548 | if (IsDependent) { |
| 549 | MemberOfUnknownSpecialization = true; |
| 550 | return false; |
| 551 | } |
| 552 | |
| 553 | // If a 'template' keyword was used, a lookup that finds only non-template |
| 554 | // names is an error. |
| 555 | if (ExampleLookupResult && RequiredTemplate) { |
| 556 | Diag(Found.getNameLoc(), diag::err_template_kw_refers_to_non_template) |
| 557 | << Found.getLookupName() << SS.getRange() |
| 558 | << RequiredTemplate.hasTemplateKeyword() |
| 559 | << RequiredTemplate.getTemplateKeywordLoc(); |
| 560 | Diag(ExampleLookupResult->getUnderlyingDecl()->getLocation(), |
| 561 | diag::note_template_kw_refers_to_non_template) |
| 562 | << Found.getLookupName(); |
| 563 | return true; |
| 564 | } |
| 565 | |
| 566 | return false; |
| 567 | } |
| 568 | |
| 569 | if (S && !ObjectType.isNull() && !ObjectTypeSearchedInScope && |
| 570 | !getLangOpts().CPlusPlus11) { |
| 571 | // C++03 [basic.lookup.classref]p1: |
| 572 | // [...] If the lookup in the class of the object expression finds a |
| 573 | // template, the name is also looked up in the context of the entire |
| 574 | // postfix-expression and [...] |
| 575 | // |
| 576 | // Note: C++11 does not perform this second lookup. |
| 577 | LookupResult FoundOuter(*this, Found.getLookupName(), Found.getNameLoc(), |
| 578 | LookupOrdinaryName); |
| 579 | FoundOuter.setTemplateNameLookup(true); |
| 580 | LookupName(FoundOuter, S); |
| 581 | // FIXME: We silently accept an ambiguous lookup here, in violation of |
| 582 | // [basic.lookup]/1. |
| 583 | FilterAcceptableTemplateNames(FoundOuter, /*AllowFunctionTemplates=*/false); |
| 584 | |
| 585 | NamedDecl *OuterTemplate; |
| 586 | if (FoundOuter.empty()) { |
| 587 | // - if the name is not found, the name found in the class of the |
| 588 | // object expression is used, otherwise |
| 589 | } else if (FoundOuter.isAmbiguous() || !FoundOuter.isSingleResult() || |
| 590 | !(OuterTemplate = |
| 591 | getAsTemplateNameDecl(FoundOuter.getFoundDecl()))) { |
| 592 | // - if the name is found in the context of the entire |
| 593 | // postfix-expression and does not name a class template, the name |
| 594 | // found in the class of the object expression is used, otherwise |
| 595 | FoundOuter.clear(); |
| 596 | } else if (!Found.isSuppressingDiagnostics()) { |
| 597 | // - if the name found is a class template, it must refer to the same |
| 598 | // entity as the one found in the class of the object expression, |
| 599 | // otherwise the program is ill-formed. |
| 600 | if (!Found.isSingleResult() || |
| 601 | getAsTemplateNameDecl(Found.getFoundDecl())->getCanonicalDecl() != |
| 602 | OuterTemplate->getCanonicalDecl()) { |
| 603 | Diag(Found.getNameLoc(), |
| 604 | diag::ext_nested_name_member_ref_lookup_ambiguous) |
| 605 | << Found.getLookupName() |
| 606 | << ObjectType; |
| 607 | Diag(Found.getRepresentativeDecl()->getLocation(), |
| 608 | diag::note_ambig_member_ref_object_type) |
| 609 | << ObjectType; |
| 610 | Diag(FoundOuter.getFoundDecl()->getLocation(), |
| 611 | diag::note_ambig_member_ref_scope); |
| 612 | |
| 613 | // Recover by taking the template that we found in the object |
| 614 | // expression's type. |
| 615 | } |
| 616 | } |
| 617 | } |
| 618 | |
| 619 | return false; |
| 620 | } |
| 621 | |
| 622 | void Sema::diagnoseExprIntendedAsTemplateName(Scope *S, ExprResult TemplateName, |
| 623 | SourceLocation Less, |
| 624 | SourceLocation Greater) { |
| 625 | if (TemplateName.isInvalid()) |
| 626 | return; |
| 627 | |
| 628 | DeclarationNameInfo NameInfo; |
| 629 | CXXScopeSpec SS; |
| 630 | LookupNameKind LookupKind; |
| 631 | |
| 632 | DeclContext *LookupCtx = nullptr; |
| 633 | NamedDecl *Found = nullptr; |
| 634 | bool MissingTemplateKeyword = false; |
| 635 | |
| 636 | // Figure out what name we looked up. |
| 637 | if (auto *DRE = dyn_cast<DeclRefExpr>(TemplateName.get())) { |
| 638 | NameInfo = DRE->getNameInfo(); |
| 639 | SS.Adopt(DRE->getQualifierLoc()); |
| 640 | LookupKind = LookupOrdinaryName; |
| 641 | Found = DRE->getFoundDecl(); |
| 642 | } else if (auto *ME = dyn_cast<MemberExpr>(TemplateName.get())) { |
| 643 | NameInfo = ME->getMemberNameInfo(); |
| 644 | SS.Adopt(ME->getQualifierLoc()); |
| 645 | LookupKind = LookupMemberName; |
| 646 | LookupCtx = ME->getBase()->getType()->getAsCXXRecordDecl(); |
| 647 | Found = ME->getMemberDecl(); |
| 648 | } else if (auto *DSDRE = |
| 649 | dyn_cast<DependentScopeDeclRefExpr>(TemplateName.get())) { |
| 650 | NameInfo = DSDRE->getNameInfo(); |
| 651 | SS.Adopt(DSDRE->getQualifierLoc()); |
| 652 | MissingTemplateKeyword = true; |
| 653 | } else if (auto *DSME = |
| 654 | dyn_cast<CXXDependentScopeMemberExpr>(TemplateName.get())) { |
| 655 | NameInfo = DSME->getMemberNameInfo(); |
| 656 | SS.Adopt(DSME->getQualifierLoc()); |
| 657 | MissingTemplateKeyword = true; |
| 658 | } else { |
| 659 | llvm_unreachable("unexpected kind of potential template name")::llvm::llvm_unreachable_internal("unexpected kind of potential template name" , "clang/lib/Sema/SemaTemplate.cpp", 659); |
| 660 | } |
| 661 | |
| 662 | // If this is a dependent-scope lookup, diagnose that the 'template' keyword |
| 663 | // was missing. |
| 664 | if (MissingTemplateKeyword) { |
| 665 | Diag(NameInfo.getBeginLoc(), diag::err_template_kw_missing) |
| 666 | << "" << NameInfo.getName().getAsString() << SourceRange(Less, Greater); |
| 667 | return; |
| 668 | } |
| 669 | |
| 670 | // Try to correct the name by looking for templates and C++ named casts. |
| 671 | struct TemplateCandidateFilter : CorrectionCandidateCallback { |
| 672 | Sema &S; |
| 673 | TemplateCandidateFilter(Sema &S) : S(S) { |
| 674 | WantTypeSpecifiers = false; |
| 675 | WantExpressionKeywords = false; |
| 676 | WantRemainingKeywords = false; |
| 677 | WantCXXNamedCasts = true; |
| 678 | }; |
| 679 | bool ValidateCandidate(const TypoCorrection &Candidate) override { |
| 680 | if (auto *ND = Candidate.getCorrectionDecl()) |
| 681 | return S.getAsTemplateNameDecl(ND); |
| 682 | return Candidate.isKeyword(); |
| 683 | } |
| 684 | |
| 685 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
| 686 | return std::make_unique<TemplateCandidateFilter>(*this); |
| 687 | } |
| 688 | }; |
| 689 | |
| 690 | DeclarationName Name = NameInfo.getName(); |
| 691 | TemplateCandidateFilter CCC(*this); |
| 692 | if (TypoCorrection Corrected = CorrectTypo(NameInfo, LookupKind, S, &SS, CCC, |
| 693 | CTK_ErrorRecovery, LookupCtx)) { |
| 694 | auto *ND = Corrected.getFoundDecl(); |
| 695 | if (ND) |
| 696 | ND = getAsTemplateNameDecl(ND); |
| 697 | if (ND || Corrected.isKeyword()) { |
| 698 | if (LookupCtx) { |
| 699 | std::string CorrectedStr(Corrected.getAsString(getLangOpts())); |
| 700 | bool DroppedSpecifier = Corrected.WillReplaceSpecifier() && |
| 701 | Name.getAsString() == CorrectedStr; |
| 702 | diagnoseTypo(Corrected, |
| 703 | PDiag(diag::err_non_template_in_member_template_id_suggest) |
| 704 | << Name << LookupCtx << DroppedSpecifier |
| 705 | << SS.getRange(), false); |
| 706 | } else { |
| 707 | diagnoseTypo(Corrected, |
| 708 | PDiag(diag::err_non_template_in_template_id_suggest) |
| 709 | << Name, false); |
| 710 | } |
| 711 | if (Found) |
| 712 | Diag(Found->getLocation(), |
| 713 | diag::note_non_template_in_template_id_found); |
| 714 | return; |
| 715 | } |
| 716 | } |
| 717 | |
| 718 | Diag(NameInfo.getLoc(), diag::err_non_template_in_template_id) |
| 719 | << Name << SourceRange(Less, Greater); |
| 720 | if (Found) |
| 721 | Diag(Found->getLocation(), diag::note_non_template_in_template_id_found); |
| 722 | } |
| 723 | |
| 724 | /// ActOnDependentIdExpression - Handle a dependent id-expression that |
| 725 | /// was just parsed. This is only possible with an explicit scope |
| 726 | /// specifier naming a dependent type. |
| 727 | ExprResult |
| 728 | Sema::ActOnDependentIdExpression(const CXXScopeSpec &SS, |
| 729 | SourceLocation TemplateKWLoc, |
| 730 | const DeclarationNameInfo &NameInfo, |
| 731 | bool isAddressOfOperand, |
| 732 | const TemplateArgumentListInfo *TemplateArgs) { |
| 733 | DeclContext *DC = getFunctionLevelDeclContext(); |
| 734 | |
| 735 | // C++11 [expr.prim.general]p12: |
| 736 | // An id-expression that denotes a non-static data member or non-static |
| 737 | // member function of a class can only be used: |
| 738 | // (...) |
| 739 | // - if that id-expression denotes a non-static data member and it |
| 740 | // appears in an unevaluated operand. |
| 741 | // |
| 742 | // If this might be the case, form a DependentScopeDeclRefExpr instead of a |
| 743 | // CXXDependentScopeMemberExpr. The former can instantiate to either |
| 744 | // DeclRefExpr or MemberExpr depending on lookup results, while the latter is |
| 745 | // always a MemberExpr. |
| 746 | bool MightBeCxx11UnevalField = |
| 747 | getLangOpts().CPlusPlus11 && isUnevaluatedContext(); |
| 748 | |
| 749 | // Check if the nested name specifier is an enum type. |
| 750 | bool IsEnum = false; |
| 751 | if (NestedNameSpecifier *NNS = SS.getScopeRep()) |
| 752 | IsEnum = isa_and_nonnull<EnumType>(NNS->getAsType()); |
| 753 | |
| 754 | if (!MightBeCxx11UnevalField && !isAddressOfOperand && !IsEnum && |
| 755 | isa<CXXMethodDecl>(DC) && cast<CXXMethodDecl>(DC)->isInstance()) { |
| 756 | QualType ThisType = cast<CXXMethodDecl>(DC)->getThisType(); |
| 757 | |
| 758 | // Since the 'this' expression is synthesized, we don't need to |
| 759 | // perform the double-lookup check. |
| 760 | NamedDecl *FirstQualifierInScope = nullptr; |
| 761 | |
| 762 | return CXXDependentScopeMemberExpr::Create( |
| 763 | Context, /*This*/ nullptr, ThisType, /*IsArrow*/ true, |
| 764 | /*Op*/ SourceLocation(), SS.getWithLocInContext(Context), TemplateKWLoc, |
| 765 | FirstQualifierInScope, NameInfo, TemplateArgs); |
| 766 | } |
| 767 | |
| 768 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); |
| 769 | } |
| 770 | |
| 771 | ExprResult |
| 772 | Sema::BuildDependentDeclRefExpr(const CXXScopeSpec &SS, |
| 773 | SourceLocation TemplateKWLoc, |
| 774 | const DeclarationNameInfo &NameInfo, |
| 775 | const TemplateArgumentListInfo *TemplateArgs) { |
| 776 | // DependentScopeDeclRefExpr::Create requires a valid QualifierLoc |
| 777 | NestedNameSpecifierLoc QualifierLoc = SS.getWithLocInContext(Context); |
| 778 | if (!QualifierLoc) |
| 779 | return ExprError(); |
| 780 | |
| 781 | return DependentScopeDeclRefExpr::Create( |
| 782 | Context, QualifierLoc, TemplateKWLoc, NameInfo, TemplateArgs); |
| 783 | } |
| 784 | |
| 785 | |
| 786 | /// Determine whether we would be unable to instantiate this template (because |
| 787 | /// it either has no definition, or is in the process of being instantiated). |
| 788 | bool Sema::DiagnoseUninstantiableTemplate(SourceLocation PointOfInstantiation, |
| 789 | NamedDecl *Instantiation, |
| 790 | bool InstantiatedFromMember, |
| 791 | const NamedDecl *Pattern, |
| 792 | const NamedDecl *PatternDef, |
| 793 | TemplateSpecializationKind TSK, |
| 794 | bool Complain /*= true*/) { |
| 795 | assert(isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) ||(static_cast <bool> (isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl> (Instantiation)) ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)" , "clang/lib/Sema/SemaTemplate.cpp", 796, __extension__ __PRETTY_FUNCTION__ )) |
| 796 | isa<VarDecl>(Instantiation))(static_cast <bool> (isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl> (Instantiation)) ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) || isa<FunctionDecl>(Instantiation) || isa<VarDecl>(Instantiation)" , "clang/lib/Sema/SemaTemplate.cpp", 796, __extension__ __PRETTY_FUNCTION__ )); |
| 797 | |
| 798 | bool IsEntityBeingDefined = false; |
| 799 | if (const TagDecl *TD = dyn_cast_or_null<TagDecl>(PatternDef)) |
| 800 | IsEntityBeingDefined = TD->isBeingDefined(); |
| 801 | |
| 802 | if (PatternDef && !IsEntityBeingDefined) { |
| 803 | NamedDecl *SuggestedDef = nullptr; |
| 804 | if (!hasReachableDefinition(const_cast<NamedDecl *>(PatternDef), |
| 805 | &SuggestedDef, |
| 806 | /*OnlyNeedComplete*/ false)) { |
| 807 | // If we're allowed to diagnose this and recover, do so. |
| 808 | bool Recover = Complain && !isSFINAEContext(); |
| 809 | if (Complain) |
| 810 | diagnoseMissingImport(PointOfInstantiation, SuggestedDef, |
| 811 | Sema::MissingImportKind::Definition, Recover); |
| 812 | return !Recover; |
| 813 | } |
| 814 | return false; |
| 815 | } |
| 816 | |
| 817 | if (!Complain || (PatternDef && PatternDef->isInvalidDecl())) |
| 818 | return true; |
| 819 | |
| 820 | std::optional<unsigned> Note; |
| 821 | QualType InstantiationTy; |
| 822 | if (TagDecl *TD = dyn_cast<TagDecl>(Instantiation)) |
| 823 | InstantiationTy = Context.getTypeDeclType(TD); |
| 824 | if (PatternDef) { |
| 825 | Diag(PointOfInstantiation, |
| 826 | diag::err_template_instantiate_within_definition) |
| 827 | << /*implicit|explicit*/(TSK != TSK_ImplicitInstantiation) |
| 828 | << InstantiationTy; |
| 829 | // Not much point in noting the template declaration here, since |
| 830 | // we're lexically inside it. |
| 831 | Instantiation->setInvalidDecl(); |
| 832 | } else if (InstantiatedFromMember) { |
| 833 | if (isa<FunctionDecl>(Instantiation)) { |
| 834 | Diag(PointOfInstantiation, |
| 835 | diag::err_explicit_instantiation_undefined_member) |
| 836 | << /*member function*/ 1 << Instantiation->getDeclName() |
| 837 | << Instantiation->getDeclContext(); |
| 838 | Note = diag::note_explicit_instantiation_here; |
| 839 | } else { |
| 840 | assert(isa<TagDecl>(Instantiation) && "Must be a TagDecl!")(static_cast <bool> (isa<TagDecl>(Instantiation) && "Must be a TagDecl!") ? void (0) : __assert_fail ("isa<TagDecl>(Instantiation) && \"Must be a TagDecl!\"" , "clang/lib/Sema/SemaTemplate.cpp", 840, __extension__ __PRETTY_FUNCTION__ )); |
| 841 | Diag(PointOfInstantiation, |
| 842 | diag::err_implicit_instantiate_member_undefined) |
| 843 | << InstantiationTy; |
| 844 | Note = diag::note_member_declared_at; |
| 845 | } |
| 846 | } else { |
| 847 | if (isa<FunctionDecl>(Instantiation)) { |
| 848 | Diag(PointOfInstantiation, |
| 849 | diag::err_explicit_instantiation_undefined_func_template) |
| 850 | << Pattern; |
| 851 | Note = diag::note_explicit_instantiation_here; |
| 852 | } else if (isa<TagDecl>(Instantiation)) { |
| 853 | Diag(PointOfInstantiation, diag::err_template_instantiate_undefined) |
| 854 | << (TSK != TSK_ImplicitInstantiation) |
| 855 | << InstantiationTy; |
| 856 | Note = diag::note_template_decl_here; |
| 857 | } else { |
| 858 | assert(isa<VarDecl>(Instantiation) && "Must be a VarDecl!")(static_cast <bool> (isa<VarDecl>(Instantiation) && "Must be a VarDecl!") ? void (0) : __assert_fail ("isa<VarDecl>(Instantiation) && \"Must be a VarDecl!\"" , "clang/lib/Sema/SemaTemplate.cpp", 858, __extension__ __PRETTY_FUNCTION__ )); |
| 859 | if (isa<VarTemplateSpecializationDecl>(Instantiation)) { |
| 860 | Diag(PointOfInstantiation, |
| 861 | diag::err_explicit_instantiation_undefined_var_template) |
| 862 | << Instantiation; |
| 863 | Instantiation->setInvalidDecl(); |
| 864 | } else |
| 865 | Diag(PointOfInstantiation, |
| 866 | diag::err_explicit_instantiation_undefined_member) |
| 867 | << /*static data member*/ 2 << Instantiation->getDeclName() |
| 868 | << Instantiation->getDeclContext(); |
| 869 | Note = diag::note_explicit_instantiation_here; |
| 870 | } |
| 871 | } |
| 872 | if (Note) // Diagnostics were emitted. |
| 873 | Diag(Pattern->getLocation(), *Note); |
| 874 | |
| 875 | // In general, Instantiation isn't marked invalid to get more than one |
| 876 | // error for multiple undefined instantiations. But the code that does |
| 877 | // explicit declaration -> explicit definition conversion can't handle |
| 878 | // invalid declarations, so mark as invalid in that case. |
| 879 | if (TSK == TSK_ExplicitInstantiationDeclaration) |
| 880 | Instantiation->setInvalidDecl(); |
| 881 | return true; |
| 882 | } |
| 883 | |
| 884 | /// DiagnoseTemplateParameterShadow - Produce a diagnostic complaining |
| 885 | /// that the template parameter 'PrevDecl' is being shadowed by a new |
| 886 | /// declaration at location Loc. Returns true to indicate that this is |
| 887 | /// an error, and false otherwise. |
| 888 | void Sema::DiagnoseTemplateParameterShadow(SourceLocation Loc, Decl *PrevDecl) { |
| 889 | assert(PrevDecl->isTemplateParameter() && "Not a template parameter")(static_cast <bool> (PrevDecl->isTemplateParameter() && "Not a template parameter") ? void (0) : __assert_fail ("PrevDecl->isTemplateParameter() && \"Not a template parameter\"" , "clang/lib/Sema/SemaTemplate.cpp", 889, __extension__ __PRETTY_FUNCTION__ )); |
| 890 | |
| 891 | // C++ [temp.local]p4: |
| 892 | // A template-parameter shall not be redeclared within its |
| 893 | // scope (including nested scopes). |
| 894 | // |
| 895 | // Make this a warning when MSVC compatibility is requested. |
| 896 | unsigned DiagId = getLangOpts().MSVCCompat ? diag::ext_template_param_shadow |
| 897 | : diag::err_template_param_shadow; |
| 898 | Diag(Loc, DiagId) << cast<NamedDecl>(PrevDecl)->getDeclName(); |
| 899 | Diag(PrevDecl->getLocation(), diag::note_template_param_here); |
| 900 | } |
| 901 | |
| 902 | /// AdjustDeclIfTemplate - If the given decl happens to be a template, reset |
| 903 | /// the parameter D to reference the templated declaration and return a pointer |
| 904 | /// to the template declaration. Otherwise, do nothing to D and return null. |
| 905 | TemplateDecl *Sema::AdjustDeclIfTemplate(Decl *&D) { |
| 906 | if (TemplateDecl *Temp = dyn_cast_or_null<TemplateDecl>(D)) { |
| 907 | D = Temp->getTemplatedDecl(); |
| 908 | return Temp; |
| 909 | } |
| 910 | return nullptr; |
| 911 | } |
| 912 | |
| 913 | ParsedTemplateArgument ParsedTemplateArgument::getTemplatePackExpansion( |
| 914 | SourceLocation EllipsisLoc) const { |
| 915 | assert(Kind == Template &&(static_cast <bool> (Kind == Template && "Only template template arguments can be pack expansions here" ) ? void (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\"" , "clang/lib/Sema/SemaTemplate.cpp", 916, __extension__ __PRETTY_FUNCTION__ )) |
| 916 | "Only template template arguments can be pack expansions here")(static_cast <bool> (Kind == Template && "Only template template arguments can be pack expansions here" ) ? void (0) : __assert_fail ("Kind == Template && \"Only template template arguments can be pack expansions here\"" , "clang/lib/Sema/SemaTemplate.cpp", 916, __extension__ __PRETTY_FUNCTION__ )); |
| 917 | assert(getAsTemplate().get().containsUnexpandedParameterPack() &&(static_cast <bool> (getAsTemplate().get().containsUnexpandedParameterPack () && "Template template argument pack expansion without packs" ) ? void (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\"" , "clang/lib/Sema/SemaTemplate.cpp", 918, __extension__ __PRETTY_FUNCTION__ )) |
| 918 | "Template template argument pack expansion without packs")(static_cast <bool> (getAsTemplate().get().containsUnexpandedParameterPack () && "Template template argument pack expansion without packs" ) ? void (0) : __assert_fail ("getAsTemplate().get().containsUnexpandedParameterPack() && \"Template template argument pack expansion without packs\"" , "clang/lib/Sema/SemaTemplate.cpp", 918, __extension__ __PRETTY_FUNCTION__ )); |
| 919 | ParsedTemplateArgument Result(*this); |
| 920 | Result.EllipsisLoc = EllipsisLoc; |
| 921 | return Result; |
| 922 | } |
| 923 | |
| 924 | static TemplateArgumentLoc translateTemplateArgument(Sema &SemaRef, |
| 925 | const ParsedTemplateArgument &Arg) { |
| 926 | |
| 927 | switch (Arg.getKind()) { |
| 928 | case ParsedTemplateArgument::Type: { |
| 929 | TypeSourceInfo *DI; |
| 930 | QualType T = SemaRef.GetTypeFromParser(Arg.getAsType(), &DI); |
| 931 | if (!DI) |
| 932 | DI = SemaRef.Context.getTrivialTypeSourceInfo(T, Arg.getLocation()); |
| 933 | return TemplateArgumentLoc(TemplateArgument(T), DI); |
| 934 | } |
| 935 | |
| 936 | case ParsedTemplateArgument::NonType: { |
| 937 | Expr *E = static_cast<Expr *>(Arg.getAsExpr()); |
| 938 | return TemplateArgumentLoc(TemplateArgument(E), E); |
| 939 | } |
| 940 | |
| 941 | case ParsedTemplateArgument::Template: { |
| 942 | TemplateName Template = Arg.getAsTemplate().get(); |
| 943 | TemplateArgument TArg; |
| 944 | if (Arg.getEllipsisLoc().isValid()) |
| 945 | TArg = TemplateArgument(Template, std::optional<unsigned int>()); |
| 946 | else |
| 947 | TArg = Template; |
| 948 | return TemplateArgumentLoc( |
| 949 | SemaRef.Context, TArg, |
| 950 | Arg.getScopeSpec().getWithLocInContext(SemaRef.Context), |
| 951 | Arg.getLocation(), Arg.getEllipsisLoc()); |
| 952 | } |
| 953 | } |
| 954 | |
| 955 | llvm_unreachable("Unhandled parsed template argument")::llvm::llvm_unreachable_internal("Unhandled parsed template argument" , "clang/lib/Sema/SemaTemplate.cpp", 955); |
| 956 | } |
| 957 | |
| 958 | /// Translates template arguments as provided by the parser |
| 959 | /// into template arguments used by semantic analysis. |
| 960 | void Sema::translateTemplateArguments(const ASTTemplateArgsPtr &TemplateArgsIn, |
| 961 | TemplateArgumentListInfo &TemplateArgs) { |
| 962 | for (unsigned I = 0, Last = TemplateArgsIn.size(); I != Last; ++I) |
| 963 | TemplateArgs.addArgument(translateTemplateArgument(*this, |
| 964 | TemplateArgsIn[I])); |
| 965 | } |
| 966 | |
| 967 | static void maybeDiagnoseTemplateParameterShadow(Sema &SemaRef, Scope *S, |
| 968 | SourceLocation Loc, |
| 969 | IdentifierInfo *Name) { |
| 970 | NamedDecl *PrevDecl = SemaRef.LookupSingleName( |
| 971 | S, Name, Loc, Sema::LookupOrdinaryName, Sema::ForVisibleRedeclaration); |
| 972 | if (PrevDecl && PrevDecl->isTemplateParameter()) |
| 973 | SemaRef.DiagnoseTemplateParameterShadow(Loc, PrevDecl); |
| 974 | } |
| 975 | |
| 976 | /// Convert a parsed type into a parsed template argument. This is mostly |
| 977 | /// trivial, except that we may have parsed a C++17 deduced class template |
| 978 | /// specialization type, in which case we should form a template template |
| 979 | /// argument instead of a type template argument. |
| 980 | ParsedTemplateArgument Sema::ActOnTemplateTypeArgument(TypeResult ParsedType) { |
| 981 | TypeSourceInfo *TInfo; |
| 982 | QualType T = GetTypeFromParser(ParsedType.get(), &TInfo); |
| 983 | if (T.isNull()) |
| 984 | return ParsedTemplateArgument(); |
| 985 | assert(TInfo && "template argument with no location")(static_cast <bool> (TInfo && "template argument with no location" ) ? void (0) : __assert_fail ("TInfo && \"template argument with no location\"" , "clang/lib/Sema/SemaTemplate.cpp", 985, __extension__ __PRETTY_FUNCTION__ )); |
| 986 | |
| 987 | // If we might have formed a deduced template specialization type, convert |
| 988 | // it to a template template argument. |
| 989 | if (getLangOpts().CPlusPlus17) { |
| 990 | TypeLoc TL = TInfo->getTypeLoc(); |
| 991 | SourceLocation EllipsisLoc; |
| 992 | if (auto PET = TL.getAs<PackExpansionTypeLoc>()) { |
| 993 | EllipsisLoc = PET.getEllipsisLoc(); |
| 994 | TL = PET.getPatternLoc(); |
| 995 | } |
| 996 | |
| 997 | CXXScopeSpec SS; |
| 998 | if (auto ET = TL.getAs<ElaboratedTypeLoc>()) { |
| 999 | SS.Adopt(ET.getQualifierLoc()); |
| 1000 | TL = ET.getNamedTypeLoc(); |
| 1001 | } |
| 1002 | |
| 1003 | if (auto DTST = TL.getAs<DeducedTemplateSpecializationTypeLoc>()) { |
| 1004 | TemplateName Name = DTST.getTypePtr()->getTemplateName(); |
| 1005 | if (SS.isSet()) |
| 1006 | Name = Context.getQualifiedTemplateName(SS.getScopeRep(), |
| 1007 | /*HasTemplateKeyword=*/false, |
| 1008 | Name); |
| 1009 | ParsedTemplateArgument Result(SS, TemplateTy::make(Name), |
| 1010 | DTST.getTemplateNameLoc()); |
| 1011 | if (EllipsisLoc.isValid()) |
| 1012 | Result = Result.getTemplatePackExpansion(EllipsisLoc); |
| 1013 | return Result; |
| 1014 | } |
| 1015 | } |
| 1016 | |
| 1017 | // This is a normal type template argument. Note, if the type template |
| 1018 | // argument is an injected-class-name for a template, it has a dual nature |
| 1019 | // and can be used as either a type or a template. We handle that in |
| 1020 | // convertTypeTemplateArgumentToTemplate. |
| 1021 | return ParsedTemplateArgument(ParsedTemplateArgument::Type, |
| 1022 | ParsedType.get().getAsOpaquePtr(), |
| 1023 | TInfo->getTypeLoc().getBeginLoc()); |
| 1024 | } |
| 1025 | |
| 1026 | /// ActOnTypeParameter - Called when a C++ template type parameter |
| 1027 | /// (e.g., "typename T") has been parsed. Typename specifies whether |
| 1028 | /// the keyword "typename" was used to declare the type parameter |
| 1029 | /// (otherwise, "class" was used), and KeyLoc is the location of the |
| 1030 | /// "class" or "typename" keyword. ParamName is the name of the |
| 1031 | /// parameter (NULL indicates an unnamed template parameter) and |
| 1032 | /// ParamNameLoc is the location of the parameter name (if any). |
| 1033 | /// If the type parameter has a default argument, it will be added |
| 1034 | /// later via ActOnTypeParameterDefault. |
| 1035 | NamedDecl *Sema::ActOnTypeParameter(Scope *S, bool Typename, |
| 1036 | SourceLocation EllipsisLoc, |
| 1037 | SourceLocation KeyLoc, |
| 1038 | IdentifierInfo *ParamName, |
| 1039 | SourceLocation ParamNameLoc, |
| 1040 | unsigned Depth, unsigned Position, |
| 1041 | SourceLocation EqualLoc, |
| 1042 | ParsedType DefaultArg, |
| 1043 | bool HasTypeConstraint) { |
| 1044 | assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() && "Template type parameter not in template parameter scope!") ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1045, __extension__ __PRETTY_FUNCTION__ )) |
| 1045 | "Template type parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() && "Template type parameter not in template parameter scope!") ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template type parameter not in template parameter scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1045, __extension__ __PRETTY_FUNCTION__ )); |
| 1046 | |
| 1047 | bool IsParameterPack = EllipsisLoc.isValid(); |
| 1048 | TemplateTypeParmDecl *Param |
| 1049 | = TemplateTypeParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
| 1050 | KeyLoc, ParamNameLoc, Depth, Position, |
| 1051 | ParamName, Typename, IsParameterPack, |
| 1052 | HasTypeConstraint); |
| 1053 | Param->setAccess(AS_public); |
| 1054 | |
| 1055 | if (Param->isParameterPack()) |
| 1056 | if (auto *LSI = getEnclosingLambda()) |
| 1057 | LSI->LocalPacks.push_back(Param); |
| 1058 | |
| 1059 | if (ParamName) { |
| 1060 | maybeDiagnoseTemplateParameterShadow(*this, S, ParamNameLoc, ParamName); |
| 1061 | |
| 1062 | // Add the template parameter into the current scope. |
| 1063 | S->AddDecl(Param); |
| 1064 | IdResolver.AddDecl(Param); |
| 1065 | } |
| 1066 | |
| 1067 | // C++0x [temp.param]p9: |
| 1068 | // A default template-argument may be specified for any kind of |
| 1069 | // template-parameter that is not a template parameter pack. |
| 1070 | if (DefaultArg && IsParameterPack) { |
| 1071 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
| 1072 | DefaultArg = nullptr; |
| 1073 | } |
| 1074 | |
| 1075 | // Handle the default argument, if provided. |
| 1076 | if (DefaultArg) { |
| 1077 | TypeSourceInfo *DefaultTInfo; |
| 1078 | GetTypeFromParser(DefaultArg, &DefaultTInfo); |
| 1079 | |
| 1080 | assert(DefaultTInfo && "expected source information for type")(static_cast <bool> (DefaultTInfo && "expected source information for type" ) ? void (0) : __assert_fail ("DefaultTInfo && \"expected source information for type\"" , "clang/lib/Sema/SemaTemplate.cpp", 1080, __extension__ __PRETTY_FUNCTION__ )); |
| 1081 | |
| 1082 | // Check for unexpanded parameter packs. |
| 1083 | if (DiagnoseUnexpandedParameterPack(ParamNameLoc, DefaultTInfo, |
| 1084 | UPPC_DefaultArgument)) |
| 1085 | return Param; |
| 1086 | |
| 1087 | // Check the template argument itself. |
| 1088 | if (CheckTemplateArgument(DefaultTInfo)) { |
| 1089 | Param->setInvalidDecl(); |
| 1090 | return Param; |
| 1091 | } |
| 1092 | |
| 1093 | Param->setDefaultArgument(DefaultTInfo); |
| 1094 | } |
| 1095 | |
| 1096 | return Param; |
| 1097 | } |
| 1098 | |
| 1099 | /// Convert the parser's template argument list representation into our form. |
| 1100 | static TemplateArgumentListInfo |
| 1101 | makeTemplateArgumentListInfo(Sema &S, TemplateIdAnnotation &TemplateId) { |
| 1102 | TemplateArgumentListInfo TemplateArgs(TemplateId.LAngleLoc, |
| 1103 | TemplateId.RAngleLoc); |
| 1104 | ASTTemplateArgsPtr TemplateArgsPtr(TemplateId.getTemplateArgs(), |
| 1105 | TemplateId.NumArgs); |
| 1106 | S.translateTemplateArguments(TemplateArgsPtr, TemplateArgs); |
| 1107 | return TemplateArgs; |
| 1108 | } |
| 1109 | |
| 1110 | bool Sema::ActOnTypeConstraint(const CXXScopeSpec &SS, |
| 1111 | TemplateIdAnnotation *TypeConstr, |
| 1112 | TemplateTypeParmDecl *ConstrainedParameter, |
| 1113 | SourceLocation EllipsisLoc) { |
| 1114 | return BuildTypeConstraint(SS, TypeConstr, ConstrainedParameter, EllipsisLoc, |
| 1115 | false); |
| 1116 | } |
| 1117 | |
| 1118 | bool Sema::BuildTypeConstraint(const CXXScopeSpec &SS, |
| 1119 | TemplateIdAnnotation *TypeConstr, |
| 1120 | TemplateTypeParmDecl *ConstrainedParameter, |
| 1121 | SourceLocation EllipsisLoc, |
| 1122 | bool AllowUnexpandedPack) { |
| 1123 | TemplateName TN = TypeConstr->Template.get(); |
| 1124 | ConceptDecl *CD = cast<ConceptDecl>(TN.getAsTemplateDecl()); |
| 1125 | |
| 1126 | // C++2a [temp.param]p4: |
| 1127 | // [...] The concept designated by a type-constraint shall be a type |
| 1128 | // concept ([temp.concept]). |
| 1129 | if (!CD->isTypeConcept()) { |
| 1130 | Diag(TypeConstr->TemplateNameLoc, |
| 1131 | diag::err_type_constraint_non_type_concept); |
| 1132 | return true; |
| 1133 | } |
| 1134 | |
| 1135 | bool WereArgsSpecified = TypeConstr->LAngleLoc.isValid(); |
| 1136 | |
| 1137 | if (!WereArgsSpecified && |
| 1138 | CD->getTemplateParameters()->getMinRequiredArguments() > 1) { |
| 1139 | Diag(TypeConstr->TemplateNameLoc, |
| 1140 | diag::err_type_constraint_missing_arguments) << CD; |
| 1141 | return true; |
| 1142 | } |
| 1143 | |
| 1144 | DeclarationNameInfo ConceptName(DeclarationName(TypeConstr->Name), |
| 1145 | TypeConstr->TemplateNameLoc); |
| 1146 | |
| 1147 | TemplateArgumentListInfo TemplateArgs; |
| 1148 | if (TypeConstr->LAngleLoc.isValid()) { |
| 1149 | TemplateArgs = |
| 1150 | makeTemplateArgumentListInfo(*this, *TypeConstr); |
| 1151 | |
| 1152 | if (EllipsisLoc.isInvalid() && !AllowUnexpandedPack) { |
| 1153 | for (TemplateArgumentLoc Arg : TemplateArgs.arguments()) { |
| 1154 | if (DiagnoseUnexpandedParameterPack(Arg, UPPC_TypeConstraint)) |
| 1155 | return true; |
| 1156 | } |
| 1157 | } |
| 1158 | } |
| 1159 | return AttachTypeConstraint( |
| 1160 | SS.isSet() ? SS.getWithLocInContext(Context) : NestedNameSpecifierLoc(), |
| 1161 | ConceptName, CD, |
| 1162 | TypeConstr->LAngleLoc.isValid() ? &TemplateArgs : nullptr, |
| 1163 | ConstrainedParameter, EllipsisLoc); |
| 1164 | } |
| 1165 | |
| 1166 | template<typename ArgumentLocAppender> |
| 1167 | static ExprResult formImmediatelyDeclaredConstraint( |
| 1168 | Sema &S, NestedNameSpecifierLoc NS, DeclarationNameInfo NameInfo, |
| 1169 | ConceptDecl *NamedConcept, SourceLocation LAngleLoc, |
| 1170 | SourceLocation RAngleLoc, QualType ConstrainedType, |
| 1171 | SourceLocation ParamNameLoc, ArgumentLocAppender Appender, |
| 1172 | SourceLocation EllipsisLoc) { |
| 1173 | |
| 1174 | TemplateArgumentListInfo ConstraintArgs; |
| 1175 | ConstraintArgs.addArgument( |
| 1176 | S.getTrivialTemplateArgumentLoc(TemplateArgument(ConstrainedType), |
| 1177 | /*NTTPType=*/QualType(), ParamNameLoc)); |
| 1178 | |
| 1179 | ConstraintArgs.setRAngleLoc(RAngleLoc); |
| 1180 | ConstraintArgs.setLAngleLoc(LAngleLoc); |
| 1181 | Appender(ConstraintArgs); |
| 1182 | |
| 1183 | // C++2a [temp.param]p4: |
| 1184 | // [...] This constraint-expression E is called the immediately-declared |
| 1185 | // constraint of T. [...] |
| 1186 | CXXScopeSpec SS; |
| 1187 | SS.Adopt(NS); |
| 1188 | ExprResult ImmediatelyDeclaredConstraint = S.CheckConceptTemplateId( |
| 1189 | SS, /*TemplateKWLoc=*/SourceLocation(), NameInfo, |
| 1190 | /*FoundDecl=*/NamedConcept, NamedConcept, &ConstraintArgs); |
| 1191 | if (ImmediatelyDeclaredConstraint.isInvalid() || !EllipsisLoc.isValid()) |
| 1192 | return ImmediatelyDeclaredConstraint; |
| 1193 | |
| 1194 | // C++2a [temp.param]p4: |
| 1195 | // [...] If T is not a pack, then E is E', otherwise E is (E' && ...). |
| 1196 | // |
| 1197 | // We have the following case: |
| 1198 | // |
| 1199 | // template<typename T> concept C1 = true; |
| 1200 | // template<C1... T> struct s1; |
| 1201 | // |
| 1202 | // The constraint: (C1<T> && ...) |
| 1203 | // |
| 1204 | // Note that the type of C1<T> is known to be 'bool', so we don't need to do |
| 1205 | // any unqualified lookups for 'operator&&' here. |
| 1206 | return S.BuildCXXFoldExpr(/*UnqualifiedLookup=*/nullptr, |
| 1207 | /*LParenLoc=*/SourceLocation(), |
| 1208 | ImmediatelyDeclaredConstraint.get(), BO_LAnd, |
| 1209 | EllipsisLoc, /*RHS=*/nullptr, |
| 1210 | /*RParenLoc=*/SourceLocation(), |
| 1211 | /*NumExpansions=*/std::nullopt); |
| 1212 | } |
| 1213 | |
| 1214 | /// Attach a type-constraint to a template parameter. |
| 1215 | /// \returns true if an error occurred. This can happen if the |
| 1216 | /// immediately-declared constraint could not be formed (e.g. incorrect number |
| 1217 | /// of arguments for the named concept). |
| 1218 | bool Sema::AttachTypeConstraint(NestedNameSpecifierLoc NS, |
| 1219 | DeclarationNameInfo NameInfo, |
| 1220 | ConceptDecl *NamedConcept, |
| 1221 | const TemplateArgumentListInfo *TemplateArgs, |
| 1222 | TemplateTypeParmDecl *ConstrainedParameter, |
| 1223 | SourceLocation EllipsisLoc) { |
| 1224 | // C++2a [temp.param]p4: |
| 1225 | // [...] If Q is of the form C<A1, ..., An>, then let E' be |
| 1226 | // C<T, A1, ..., An>. Otherwise, let E' be C<T>. [...] |
| 1227 | const ASTTemplateArgumentListInfo *ArgsAsWritten = |
| 1228 | TemplateArgs ? ASTTemplateArgumentListInfo::Create(Context, |
| 1229 | *TemplateArgs) : nullptr; |
| 1230 | |
| 1231 | QualType ParamAsArgument(ConstrainedParameter->getTypeForDecl(), 0); |
| 1232 | |
| 1233 | ExprResult ImmediatelyDeclaredConstraint = |
| 1234 | formImmediatelyDeclaredConstraint( |
| 1235 | *this, NS, NameInfo, NamedConcept, |
| 1236 | TemplateArgs ? TemplateArgs->getLAngleLoc() : SourceLocation(), |
| 1237 | TemplateArgs ? TemplateArgs->getRAngleLoc() : SourceLocation(), |
| 1238 | ParamAsArgument, ConstrainedParameter->getLocation(), |
| 1239 | [&] (TemplateArgumentListInfo &ConstraintArgs) { |
| 1240 | if (TemplateArgs) |
| 1241 | for (const auto &ArgLoc : TemplateArgs->arguments()) |
| 1242 | ConstraintArgs.addArgument(ArgLoc); |
| 1243 | }, EllipsisLoc); |
| 1244 | if (ImmediatelyDeclaredConstraint.isInvalid()) |
| 1245 | return true; |
| 1246 | |
| 1247 | ConstrainedParameter->setTypeConstraint(NS, NameInfo, |
| 1248 | /*FoundDecl=*/NamedConcept, |
| 1249 | NamedConcept, ArgsAsWritten, |
| 1250 | ImmediatelyDeclaredConstraint.get()); |
| 1251 | return false; |
| 1252 | } |
| 1253 | |
| 1254 | bool Sema::AttachTypeConstraint(AutoTypeLoc TL, |
| 1255 | NonTypeTemplateParmDecl *NewConstrainedParm, |
| 1256 | NonTypeTemplateParmDecl *OrigConstrainedParm, |
| 1257 | SourceLocation EllipsisLoc) { |
| 1258 | if (NewConstrainedParm->getType() != TL.getType() || |
| 1259 | TL.getAutoKeyword() != AutoTypeKeyword::Auto) { |
| 1260 | Diag(NewConstrainedParm->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), |
| 1261 | diag::err_unsupported_placeholder_constraint) |
| 1262 | << NewConstrainedParm->getTypeSourceInfo() |
| 1263 | ->getTypeLoc() |
| 1264 | .getSourceRange(); |
| 1265 | return true; |
| 1266 | } |
| 1267 | // FIXME: Concepts: This should be the type of the placeholder, but this is |
| 1268 | // unclear in the wording right now. |
| 1269 | DeclRefExpr *Ref = |
| 1270 | BuildDeclRefExpr(OrigConstrainedParm, OrigConstrainedParm->getType(), |
| 1271 | VK_PRValue, OrigConstrainedParm->getLocation()); |
| 1272 | if (!Ref) |
| 1273 | return true; |
| 1274 | ExprResult ImmediatelyDeclaredConstraint = formImmediatelyDeclaredConstraint( |
| 1275 | *this, TL.getNestedNameSpecifierLoc(), TL.getConceptNameInfo(), |
| 1276 | TL.getNamedConcept(), TL.getLAngleLoc(), TL.getRAngleLoc(), |
| 1277 | BuildDecltypeType(Ref), OrigConstrainedParm->getLocation(), |
| 1278 | [&](TemplateArgumentListInfo &ConstraintArgs) { |
| 1279 | for (unsigned I = 0, C = TL.getNumArgs(); I != C; ++I) |
| 1280 | ConstraintArgs.addArgument(TL.getArgLoc(I)); |
| 1281 | }, |
| 1282 | EllipsisLoc); |
| 1283 | if (ImmediatelyDeclaredConstraint.isInvalid() || |
| 1284 | !ImmediatelyDeclaredConstraint.isUsable()) |
| 1285 | return true; |
| 1286 | |
| 1287 | NewConstrainedParm->setPlaceholderTypeConstraint( |
| 1288 | ImmediatelyDeclaredConstraint.get()); |
| 1289 | return false; |
| 1290 | } |
| 1291 | |
| 1292 | /// Check that the type of a non-type template parameter is |
| 1293 | /// well-formed. |
| 1294 | /// |
| 1295 | /// \returns the (possibly-promoted) parameter type if valid; |
| 1296 | /// otherwise, produces a diagnostic and returns a NULL type. |
| 1297 | QualType Sema::CheckNonTypeTemplateParameterType(TypeSourceInfo *&TSI, |
| 1298 | SourceLocation Loc) { |
| 1299 | if (TSI->getType()->isUndeducedType()) { |
| 1300 | // C++17 [temp.dep.expr]p3: |
| 1301 | // An id-expression is type-dependent if it contains |
| 1302 | // - an identifier associated by name lookup with a non-type |
| 1303 | // template-parameter declared with a type that contains a |
| 1304 | // placeholder type (7.1.7.4), |
| 1305 | TSI = SubstAutoTypeSourceInfoDependent(TSI); |
| 1306 | } |
| 1307 | |
| 1308 | return CheckNonTypeTemplateParameterType(TSI->getType(), Loc); |
| 1309 | } |
| 1310 | |
| 1311 | /// Require the given type to be a structural type, and diagnose if it is not. |
| 1312 | /// |
| 1313 | /// \return \c true if an error was produced. |
| 1314 | bool Sema::RequireStructuralType(QualType T, SourceLocation Loc) { |
| 1315 | if (T->isDependentType()) |
| 1316 | return false; |
| 1317 | |
| 1318 | if (RequireCompleteType(Loc, T, diag::err_template_nontype_parm_incomplete)) |
| 1319 | return true; |
| 1320 | |
| 1321 | if (T->isStructuralType()) |
| 1322 | return false; |
| 1323 | |
| 1324 | // Structural types are required to be object types or lvalue references. |
| 1325 | if (T->isRValueReferenceType()) { |
| 1326 | Diag(Loc, diag::err_template_nontype_parm_rvalue_ref) << T; |
| 1327 | return true; |
| 1328 | } |
| 1329 | |
| 1330 | // Don't mention structural types in our diagnostic prior to C++20. Also, |
| 1331 | // there's not much more we can say about non-scalar non-class types -- |
| 1332 | // because we can't see functions or arrays here, those can only be language |
| 1333 | // extensions. |
| 1334 | if (!getLangOpts().CPlusPlus20 || |
| 1335 | (!T->isScalarType() && !T->isRecordType())) { |
| 1336 | Diag(Loc, diag::err_template_nontype_parm_bad_type) << T; |
| 1337 | return true; |
| 1338 | } |
| 1339 | |
| 1340 | // Structural types are required to be literal types. |
| 1341 | if (RequireLiteralType(Loc, T, diag::err_template_nontype_parm_not_literal)) |
| 1342 | return true; |
| 1343 | |
| 1344 | Diag(Loc, diag::err_template_nontype_parm_not_structural) << T; |
| 1345 | |
| 1346 | // Drill down into the reason why the class is non-structural. |
| 1347 | while (const CXXRecordDecl *RD = T->getAsCXXRecordDecl()) { |
| 1348 | // All members are required to be public and non-mutable, and can't be of |
| 1349 | // rvalue reference type. Check these conditions first to prefer a "local" |
| 1350 | // reason over a more distant one. |
| 1351 | for (const FieldDecl *FD : RD->fields()) { |
| 1352 | if (FD->getAccess() != AS_public) { |
| 1353 | Diag(FD->getLocation(), diag::note_not_structural_non_public) << T << 0; |
| 1354 | return true; |
| 1355 | } |
| 1356 | if (FD->isMutable()) { |
| 1357 | Diag(FD->getLocation(), diag::note_not_structural_mutable_field) << T; |
| 1358 | return true; |
| 1359 | } |
| 1360 | if (FD->getType()->isRValueReferenceType()) { |
| 1361 | Diag(FD->getLocation(), diag::note_not_structural_rvalue_ref_field) |
| 1362 | << T; |
| 1363 | return true; |
| 1364 | } |
| 1365 | } |
| 1366 | |
| 1367 | // All bases are required to be public. |
| 1368 | for (const auto &BaseSpec : RD->bases()) { |
| 1369 | if (BaseSpec.getAccessSpecifier() != AS_public) { |
| 1370 | Diag(BaseSpec.getBaseTypeLoc(), diag::note_not_structural_non_public) |
| 1371 | << T << 1; |
| 1372 | return true; |
| 1373 | } |
| 1374 | } |
| 1375 | |
| 1376 | // All subobjects are required to be of structural types. |
| 1377 | SourceLocation SubLoc; |
| 1378 | QualType SubType; |
| 1379 | int Kind = -1; |
| 1380 | |
| 1381 | for (const FieldDecl *FD : RD->fields()) { |
| 1382 | QualType T = Context.getBaseElementType(FD->getType()); |
| 1383 | if (!T->isStructuralType()) { |
| 1384 | SubLoc = FD->getLocation(); |
| 1385 | SubType = T; |
| 1386 | Kind = 0; |
| 1387 | break; |
| 1388 | } |
| 1389 | } |
| 1390 | |
| 1391 | if (Kind == -1) { |
| 1392 | for (const auto &BaseSpec : RD->bases()) { |
| 1393 | QualType T = BaseSpec.getType(); |
| 1394 | if (!T->isStructuralType()) { |
| 1395 | SubLoc = BaseSpec.getBaseTypeLoc(); |
| 1396 | SubType = T; |
| 1397 | Kind = 1; |
| 1398 | break; |
| 1399 | } |
| 1400 | } |
| 1401 | } |
| 1402 | |
| 1403 | assert(Kind != -1 && "couldn't find reason why type is not structural")(static_cast <bool> (Kind != -1 && "couldn't find reason why type is not structural" ) ? void (0) : __assert_fail ("Kind != -1 && \"couldn't find reason why type is not structural\"" , "clang/lib/Sema/SemaTemplate.cpp", 1403, __extension__ __PRETTY_FUNCTION__ )); |
| 1404 | Diag(SubLoc, diag::note_not_structural_subobject) |
| 1405 | << T << Kind << SubType; |
| 1406 | T = SubType; |
| 1407 | RD = T->getAsCXXRecordDecl(); |
Value stored to 'RD' is never read | |
| 1408 | } |
| 1409 | |
| 1410 | return true; |
| 1411 | } |
| 1412 | |
| 1413 | QualType Sema::CheckNonTypeTemplateParameterType(QualType T, |
| 1414 | SourceLocation Loc) { |
| 1415 | // We don't allow variably-modified types as the type of non-type template |
| 1416 | // parameters. |
| 1417 | if (T->isVariablyModifiedType()) { |
| 1418 | Diag(Loc, diag::err_variably_modified_nontype_template_param) |
| 1419 | << T; |
| 1420 | return QualType(); |
| 1421 | } |
| 1422 | |
| 1423 | // C++ [temp.param]p4: |
| 1424 | // |
| 1425 | // A non-type template-parameter shall have one of the following |
| 1426 | // (optionally cv-qualified) types: |
| 1427 | // |
| 1428 | // -- integral or enumeration type, |
| 1429 | if (T->isIntegralOrEnumerationType() || |
| 1430 | // -- pointer to object or pointer to function, |
| 1431 | T->isPointerType() || |
| 1432 | // -- lvalue reference to object or lvalue reference to function, |
| 1433 | T->isLValueReferenceType() || |
| 1434 | // -- pointer to member, |
| 1435 | T->isMemberPointerType() || |
| 1436 | // -- std::nullptr_t, or |
| 1437 | T->isNullPtrType() || |
| 1438 | // -- a type that contains a placeholder type. |
| 1439 | T->isUndeducedType()) { |
| 1440 | // C++ [temp.param]p5: The top-level cv-qualifiers on the template-parameter |
| 1441 | // are ignored when determining its type. |
| 1442 | return T.getUnqualifiedType(); |
| 1443 | } |
| 1444 | |
| 1445 | // C++ [temp.param]p8: |
| 1446 | // |
| 1447 | // A non-type template-parameter of type "array of T" or |
| 1448 | // "function returning T" is adjusted to be of type "pointer to |
| 1449 | // T" or "pointer to function returning T", respectively. |
| 1450 | if (T->isArrayType() || T->isFunctionType()) |
| 1451 | return Context.getDecayedType(T); |
| 1452 | |
| 1453 | // If T is a dependent type, we can't do the check now, so we |
| 1454 | // assume that it is well-formed. Note that stripping off the |
| 1455 | // qualifiers here is not really correct if T turns out to be |
| 1456 | // an array type, but we'll recompute the type everywhere it's |
| 1457 | // used during instantiation, so that should be OK. (Using the |
| 1458 | // qualified type is equally wrong.) |
| 1459 | if (T->isDependentType()) |
| 1460 | return T.getUnqualifiedType(); |
| 1461 | |
| 1462 | // C++20 [temp.param]p6: |
| 1463 | // -- a structural type |
| 1464 | if (RequireStructuralType(T, Loc)) |
| 1465 | return QualType(); |
| 1466 | |
| 1467 | if (!getLangOpts().CPlusPlus20) { |
| 1468 | // FIXME: Consider allowing structural types as an extension in C++17. (In |
| 1469 | // earlier language modes, the template argument evaluation rules are too |
| 1470 | // inflexible.) |
| 1471 | Diag(Loc, diag::err_template_nontype_parm_bad_structural_type) << T; |
| 1472 | return QualType(); |
| 1473 | } |
| 1474 | |
| 1475 | Diag(Loc, diag::warn_cxx17_compat_template_nontype_parm_type) << T; |
| 1476 | return T.getUnqualifiedType(); |
| 1477 | } |
| 1478 | |
| 1479 | NamedDecl *Sema::ActOnNonTypeTemplateParameter(Scope *S, Declarator &D, |
| 1480 | unsigned Depth, |
| 1481 | unsigned Position, |
| 1482 | SourceLocation EqualLoc, |
| 1483 | Expr *Default) { |
| 1484 | TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); |
| 1485 | |
| 1486 | // Check that we have valid decl-specifiers specified. |
| 1487 | auto CheckValidDeclSpecifiers = [this, &D] { |
| 1488 | // C++ [temp.param] |
| 1489 | // p1 |
| 1490 | // template-parameter: |
| 1491 | // ... |
| 1492 | // parameter-declaration |
| 1493 | // p2 |
| 1494 | // ... A storage class shall not be specified in a template-parameter |
| 1495 | // declaration. |
| 1496 | // [dcl.typedef]p1: |
| 1497 | // The typedef specifier [...] shall not be used in the decl-specifier-seq |
| 1498 | // of a parameter-declaration |
| 1499 | const DeclSpec &DS = D.getDeclSpec(); |
| 1500 | auto EmitDiag = [this](SourceLocation Loc) { |
| 1501 | Diag(Loc, diag::err_invalid_decl_specifier_in_nontype_parm) |
| 1502 | << FixItHint::CreateRemoval(Loc); |
| 1503 | }; |
| 1504 | if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) |
| 1505 | EmitDiag(DS.getStorageClassSpecLoc()); |
| 1506 | |
| 1507 | if (DS.getThreadStorageClassSpec() != TSCS_unspecified) |
| 1508 | EmitDiag(DS.getThreadStorageClassSpecLoc()); |
| 1509 | |
| 1510 | // [dcl.inline]p1: |
| 1511 | // The inline specifier can be applied only to the declaration or |
| 1512 | // definition of a variable or function. |
| 1513 | |
| 1514 | if (DS.isInlineSpecified()) |
| 1515 | EmitDiag(DS.getInlineSpecLoc()); |
| 1516 | |
| 1517 | // [dcl.constexpr]p1: |
| 1518 | // The constexpr specifier shall be applied only to the definition of a |
| 1519 | // variable or variable template or the declaration of a function or |
| 1520 | // function template. |
| 1521 | |
| 1522 | if (DS.hasConstexprSpecifier()) |
| 1523 | EmitDiag(DS.getConstexprSpecLoc()); |
| 1524 | |
| 1525 | // [dcl.fct.spec]p1: |
| 1526 | // Function-specifiers can be used only in function declarations. |
| 1527 | |
| 1528 | if (DS.isVirtualSpecified()) |
| 1529 | EmitDiag(DS.getVirtualSpecLoc()); |
| 1530 | |
| 1531 | if (DS.hasExplicitSpecifier()) |
| 1532 | EmitDiag(DS.getExplicitSpecLoc()); |
| 1533 | |
| 1534 | if (DS.isNoreturnSpecified()) |
| 1535 | EmitDiag(DS.getNoreturnSpecLoc()); |
| 1536 | }; |
| 1537 | |
| 1538 | CheckValidDeclSpecifiers(); |
| 1539 | |
| 1540 | if (const auto *T = TInfo->getType()->getContainedDeducedType()) |
| 1541 | if (isa<AutoType>(T)) |
| 1542 | Diag(D.getIdentifierLoc(), |
| 1543 | diag::warn_cxx14_compat_template_nontype_parm_auto_type) |
| 1544 | << QualType(TInfo->getType()->getContainedAutoType(), 0); |
| 1545 | |
| 1546 | assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!" ) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1547, __extension__ __PRETTY_FUNCTION__ )) |
| 1547 | "Non-type template parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() && "Non-type template parameter not in template parameter scope!" ) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Non-type template parameter not in template parameter scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1547, __extension__ __PRETTY_FUNCTION__ )); |
| 1548 | bool Invalid = false; |
| 1549 | |
| 1550 | QualType T = CheckNonTypeTemplateParameterType(TInfo, D.getIdentifierLoc()); |
| 1551 | if (T.isNull()) { |
| 1552 | T = Context.IntTy; // Recover with an 'int' type. |
| 1553 | Invalid = true; |
| 1554 | } |
| 1555 | |
| 1556 | CheckFunctionOrTemplateParamDeclarator(S, D); |
| 1557 | |
| 1558 | IdentifierInfo *ParamName = D.getIdentifier(); |
| 1559 | bool IsParameterPack = D.hasEllipsis(); |
| 1560 | NonTypeTemplateParmDecl *Param = NonTypeTemplateParmDecl::Create( |
| 1561 | Context, Context.getTranslationUnitDecl(), D.getBeginLoc(), |
| 1562 | D.getIdentifierLoc(), Depth, Position, ParamName, T, IsParameterPack, |
| 1563 | TInfo); |
| 1564 | Param->setAccess(AS_public); |
| 1565 | |
| 1566 | if (AutoTypeLoc TL = TInfo->getTypeLoc().getContainedAutoTypeLoc()) |
| 1567 | if (TL.isConstrained()) |
| 1568 | if (AttachTypeConstraint(TL, Param, Param, D.getEllipsisLoc())) |
| 1569 | Invalid = true; |
| 1570 | |
| 1571 | if (Invalid) |
| 1572 | Param->setInvalidDecl(); |
| 1573 | |
| 1574 | if (Param->isParameterPack()) |
| 1575 | if (auto *LSI = getEnclosingLambda()) |
| 1576 | LSI->LocalPacks.push_back(Param); |
| 1577 | |
| 1578 | if (ParamName) { |
| 1579 | maybeDiagnoseTemplateParameterShadow(*this, S, D.getIdentifierLoc(), |
| 1580 | ParamName); |
| 1581 | |
| 1582 | // Add the template parameter into the current scope. |
| 1583 | S->AddDecl(Param); |
| 1584 | IdResolver.AddDecl(Param); |
| 1585 | } |
| 1586 | |
| 1587 | // C++0x [temp.param]p9: |
| 1588 | // A default template-argument may be specified for any kind of |
| 1589 | // template-parameter that is not a template parameter pack. |
| 1590 | if (Default && IsParameterPack) { |
| 1591 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
| 1592 | Default = nullptr; |
| 1593 | } |
| 1594 | |
| 1595 | // Check the well-formedness of the default template argument, if provided. |
| 1596 | if (Default) { |
| 1597 | // Check for unexpanded parameter packs. |
| 1598 | if (DiagnoseUnexpandedParameterPack(Default, UPPC_DefaultArgument)) |
| 1599 | return Param; |
| 1600 | |
| 1601 | TemplateArgument SugaredConverted, CanonicalConverted; |
| 1602 | ExprResult DefaultRes = CheckTemplateArgument( |
| 1603 | Param, Param->getType(), Default, SugaredConverted, CanonicalConverted, |
| 1604 | CTAK_Specified); |
| 1605 | if (DefaultRes.isInvalid()) { |
| 1606 | Param->setInvalidDecl(); |
| 1607 | return Param; |
| 1608 | } |
| 1609 | Default = DefaultRes.get(); |
| 1610 | |
| 1611 | Param->setDefaultArgument(Default); |
| 1612 | } |
| 1613 | |
| 1614 | return Param; |
| 1615 | } |
| 1616 | |
| 1617 | /// ActOnTemplateTemplateParameter - Called when a C++ template template |
| 1618 | /// parameter (e.g. T in template <template \<typename> class T> class array) |
| 1619 | /// has been parsed. S is the current scope. |
| 1620 | NamedDecl *Sema::ActOnTemplateTemplateParameter(Scope* S, |
| 1621 | SourceLocation TmpLoc, |
| 1622 | TemplateParameterList *Params, |
| 1623 | SourceLocation EllipsisLoc, |
| 1624 | IdentifierInfo *Name, |
| 1625 | SourceLocation NameLoc, |
| 1626 | unsigned Depth, |
| 1627 | unsigned Position, |
| 1628 | SourceLocation EqualLoc, |
| 1629 | ParsedTemplateArgument Default) { |
| 1630 | assert(S->isTemplateParamScope() &&(static_cast <bool> (S->isTemplateParamScope() && "Template template parameter not in template parameter scope!" ) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1631, __extension__ __PRETTY_FUNCTION__ )) |
| 1631 | "Template template parameter not in template parameter scope!")(static_cast <bool> (S->isTemplateParamScope() && "Template template parameter not in template parameter scope!" ) ? void (0) : __assert_fail ("S->isTemplateParamScope() && \"Template template parameter not in template parameter scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 1631, __extension__ __PRETTY_FUNCTION__ )); |
| 1632 | |
| 1633 | // Construct the parameter object. |
| 1634 | bool IsParameterPack = EllipsisLoc.isValid(); |
| 1635 | TemplateTemplateParmDecl *Param = |
| 1636 | TemplateTemplateParmDecl::Create(Context, Context.getTranslationUnitDecl(), |
| 1637 | NameLoc.isInvalid()? TmpLoc : NameLoc, |
| 1638 | Depth, Position, IsParameterPack, |
| 1639 | Name, Params); |
| 1640 | Param->setAccess(AS_public); |
| 1641 | |
| 1642 | if (Param->isParameterPack()) |
| 1643 | if (auto *LSI = getEnclosingLambda()) |
| 1644 | LSI->LocalPacks.push_back(Param); |
| 1645 | |
| 1646 | // If the template template parameter has a name, then link the identifier |
| 1647 | // into the scope and lookup mechanisms. |
| 1648 | if (Name) { |
| 1649 | maybeDiagnoseTemplateParameterShadow(*this, S, NameLoc, Name); |
| 1650 | |
| 1651 | S->AddDecl(Param); |
| 1652 | IdResolver.AddDecl(Param); |
| 1653 | } |
| 1654 | |
| 1655 | if (Params->size() == 0) { |
| 1656 | Diag(Param->getLocation(), diag::err_template_template_parm_no_parms) |
| 1657 | << SourceRange(Params->getLAngleLoc(), Params->getRAngleLoc()); |
| 1658 | Param->setInvalidDecl(); |
| 1659 | } |
| 1660 | |
| 1661 | // C++0x [temp.param]p9: |
| 1662 | // A default template-argument may be specified for any kind of |
| 1663 | // template-parameter that is not a template parameter pack. |
| 1664 | if (IsParameterPack && !Default.isInvalid()) { |
| 1665 | Diag(EqualLoc, diag::err_template_param_pack_default_arg); |
| 1666 | Default = ParsedTemplateArgument(); |
| 1667 | } |
| 1668 | |
| 1669 | if (!Default.isInvalid()) { |
| 1670 | // Check only that we have a template template argument. We don't want to |
| 1671 | // try to check well-formedness now, because our template template parameter |
| 1672 | // might have dependent types in its template parameters, which we wouldn't |
| 1673 | // be able to match now. |
| 1674 | // |
| 1675 | // If none of the template template parameter's template arguments mention |
| 1676 | // other template parameters, we could actually perform more checking here. |
| 1677 | // However, it isn't worth doing. |
| 1678 | TemplateArgumentLoc DefaultArg = translateTemplateArgument(*this, Default); |
| 1679 | if (DefaultArg.getArgument().getAsTemplate().isNull()) { |
| 1680 | Diag(DefaultArg.getLocation(), diag::err_template_arg_not_valid_template) |
| 1681 | << DefaultArg.getSourceRange(); |
| 1682 | return Param; |
| 1683 | } |
| 1684 | |
| 1685 | // Check for unexpanded parameter packs. |
| 1686 | if (DiagnoseUnexpandedParameterPack(DefaultArg.getLocation(), |
| 1687 | DefaultArg.getArgument().getAsTemplate(), |
| 1688 | UPPC_DefaultArgument)) |
| 1689 | return Param; |
| 1690 | |
| 1691 | Param->setDefaultArgument(Context, DefaultArg); |
| 1692 | } |
| 1693 | |
| 1694 | return Param; |
| 1695 | } |
| 1696 | |
| 1697 | namespace { |
| 1698 | class ConstraintRefersToContainingTemplateChecker |
| 1699 | : public TreeTransform<ConstraintRefersToContainingTemplateChecker> { |
| 1700 | bool Result = false; |
| 1701 | const FunctionDecl *Friend = nullptr; |
| 1702 | unsigned TemplateDepth = 0; |
| 1703 | |
| 1704 | // Check a record-decl that we've seen to see if it is a lexical parent of the |
| 1705 | // Friend, likely because it was referred to without its template arguments. |
| 1706 | void CheckIfContainingRecord(const CXXRecordDecl *CheckingRD) { |
| 1707 | CheckingRD = CheckingRD->getMostRecentDecl(); |
| 1708 | |
| 1709 | for (const DeclContext *DC = Friend->getLexicalDeclContext(); |
| 1710 | DC && !DC->isFileContext(); DC = DC->getParent()) |
| 1711 | if (const auto *RD = dyn_cast<CXXRecordDecl>(DC)) |
| 1712 | if (CheckingRD == RD->getMostRecentDecl()) |
| 1713 | Result = true; |
| 1714 | } |
| 1715 | |
| 1716 | void CheckNonTypeTemplateParmDecl(NonTypeTemplateParmDecl *D) { |
| 1717 | assert(D->getDepth() <= TemplateDepth &&(static_cast <bool> (D->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("D->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1719, __extension__ __PRETTY_FUNCTION__ )) |
| 1718 | "Nothing should reference a value below the actual template depth, "(static_cast <bool> (D->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("D->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1719, __extension__ __PRETTY_FUNCTION__ )) |
| 1719 | "depth is likely wrong")(static_cast <bool> (D->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("D->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1719, __extension__ __PRETTY_FUNCTION__ )); |
| 1720 | if (D->getDepth() != TemplateDepth) |
| 1721 | Result = true; |
| 1722 | |
| 1723 | // Necessary because the type of the NTTP might be what refers to the parent |
| 1724 | // constriant. |
| 1725 | TransformType(D->getType()); |
| 1726 | } |
| 1727 | |
| 1728 | public: |
| 1729 | using inherited = TreeTransform<ConstraintRefersToContainingTemplateChecker>; |
| 1730 | |
| 1731 | ConstraintRefersToContainingTemplateChecker(Sema &SemaRef, |
| 1732 | const FunctionDecl *Friend, |
| 1733 | unsigned TemplateDepth) |
| 1734 | : inherited(SemaRef), Friend(Friend), TemplateDepth(TemplateDepth) {} |
| 1735 | bool getResult() const { return Result; } |
| 1736 | |
| 1737 | // This should be the only template parm type that we have to deal with. |
| 1738 | // SubstTempalteTypeParmPack, SubstNonTypeTemplateParmPack, and |
| 1739 | // FunctionParmPackExpr are all partially substituted, which cannot happen |
| 1740 | // with concepts at this point in translation. |
| 1741 | using inherited::TransformTemplateTypeParmType; |
| 1742 | QualType TransformTemplateTypeParmType(TypeLocBuilder &TLB, |
| 1743 | TemplateTypeParmTypeLoc TL, bool) { |
| 1744 | assert(TL.getDecl()->getDepth() <= TemplateDepth &&(static_cast <bool> (TL.getDecl()->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("TL.getDecl()->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1746, __extension__ __PRETTY_FUNCTION__ )) |
| 1745 | "Nothing should reference a value below the actual template depth, "(static_cast <bool> (TL.getDecl()->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("TL.getDecl()->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1746, __extension__ __PRETTY_FUNCTION__ )) |
| 1746 | "depth is likely wrong")(static_cast <bool> (TL.getDecl()->getDepth() <= TemplateDepth && "Nothing should reference a value below the actual template depth, " "depth is likely wrong") ? void (0) : __assert_fail ("TL.getDecl()->getDepth() <= TemplateDepth && \"Nothing should reference a value below the actual template depth, \" \"depth is likely wrong\"" , "clang/lib/Sema/SemaTemplate.cpp", 1746, __extension__ __PRETTY_FUNCTION__ )); |
| 1747 | if (TL.getDecl()->getDepth() != TemplateDepth) |
| 1748 | Result = true; |
| 1749 | return inherited::TransformTemplateTypeParmType( |
| 1750 | TLB, TL, |
| 1751 | /*SuppressObjCLifetime=*/false); |
| 1752 | } |
| 1753 | |
| 1754 | Decl *TransformDecl(SourceLocation Loc, Decl *D) { |
| 1755 | if (!D) |
| 1756 | return D; |
| 1757 | // FIXME : This is possibly an incomplete list, but it is unclear what other |
| 1758 | // Decl kinds could be used to refer to the template parameters. This is a |
| 1759 | // best guess so far based on examples currently available, but the |
| 1760 | // unreachable should catch future instances/cases. |
| 1761 | if (auto *TD = dyn_cast<TypedefNameDecl>(D)) |
| 1762 | TransformType(TD->getUnderlyingType()); |
| 1763 | else if (auto *NTTPD = dyn_cast<NonTypeTemplateParmDecl>(D)) |
| 1764 | CheckNonTypeTemplateParmDecl(NTTPD); |
| 1765 | else if (auto *VD = dyn_cast<ValueDecl>(D)) |
| 1766 | TransformType(VD->getType()); |
| 1767 | else if (auto *TD = dyn_cast<TemplateDecl>(D)) |
| 1768 | TransformTemplateParameterList(TD->getTemplateParameters()); |
| 1769 | else if (auto *RD = dyn_cast<CXXRecordDecl>(D)) |
| 1770 | CheckIfContainingRecord(RD); |
| 1771 | else if (isa<NamedDecl>(D)) { |
| 1772 | // No direct types to visit here I believe. |
| 1773 | } else |
| 1774 | llvm_unreachable("Don't know how to handle this declaration type yet")::llvm::llvm_unreachable_internal("Don't know how to handle this declaration type yet" , "clang/lib/Sema/SemaTemplate.cpp", 1774); |
| 1775 | return D; |
| 1776 | } |
| 1777 | }; |
| 1778 | } // namespace |
| 1779 | |
| 1780 | bool Sema::ConstraintExpressionDependsOnEnclosingTemplate( |
| 1781 | const FunctionDecl *Friend, unsigned TemplateDepth, |
| 1782 | const Expr *Constraint) { |
| 1783 | assert(Friend->getFriendObjectKind() && "Only works on a friend")(static_cast <bool> (Friend->getFriendObjectKind() && "Only works on a friend") ? void (0) : __assert_fail ("Friend->getFriendObjectKind() && \"Only works on a friend\"" , "clang/lib/Sema/SemaTemplate.cpp", 1783, __extension__ __PRETTY_FUNCTION__ )); |
| 1784 | ConstraintRefersToContainingTemplateChecker Checker(*this, Friend, |
| 1785 | TemplateDepth); |
| 1786 | Checker.TransformExpr(const_cast<Expr *>(Constraint)); |
| 1787 | return Checker.getResult(); |
| 1788 | } |
| 1789 | |
| 1790 | /// ActOnTemplateParameterList - Builds a TemplateParameterList, optionally |
| 1791 | /// constrained by RequiresClause, that contains the template parameters in |
| 1792 | /// Params. |
| 1793 | TemplateParameterList * |
| 1794 | Sema::ActOnTemplateParameterList(unsigned Depth, |
| 1795 | SourceLocation ExportLoc, |
| 1796 | SourceLocation TemplateLoc, |
| 1797 | SourceLocation LAngleLoc, |
| 1798 | ArrayRef<NamedDecl *> Params, |
| 1799 | SourceLocation RAngleLoc, |
| 1800 | Expr *RequiresClause) { |
| 1801 | if (ExportLoc.isValid()) |
| 1802 | Diag(ExportLoc, diag::warn_template_export_unsupported); |
| 1803 | |
| 1804 | for (NamedDecl *P : Params) |
| 1805 | warnOnReservedIdentifier(P); |
| 1806 | |
| 1807 | return TemplateParameterList::Create( |
| 1808 | Context, TemplateLoc, LAngleLoc, |
| 1809 | llvm::ArrayRef(Params.data(), Params.size()), RAngleLoc, RequiresClause); |
| 1810 | } |
| 1811 | |
| 1812 | static void SetNestedNameSpecifier(Sema &S, TagDecl *T, |
| 1813 | const CXXScopeSpec &SS) { |
| 1814 | if (SS.isSet()) |
| 1815 | T->setQualifierInfo(SS.getWithLocInContext(S.Context)); |
| 1816 | } |
| 1817 | |
| 1818 | DeclResult Sema::CheckClassTemplate( |
| 1819 | Scope *S, unsigned TagSpec, TagUseKind TUK, SourceLocation KWLoc, |
| 1820 | CXXScopeSpec &SS, IdentifierInfo *Name, SourceLocation NameLoc, |
| 1821 | const ParsedAttributesView &Attr, TemplateParameterList *TemplateParams, |
| 1822 | AccessSpecifier AS, SourceLocation ModulePrivateLoc, |
| 1823 | SourceLocation FriendLoc, unsigned NumOuterTemplateParamLists, |
| 1824 | TemplateParameterList **OuterTemplateParamLists, SkipBodyInfo *SkipBody) { |
| 1825 | assert(TemplateParams && TemplateParams->size() > 0 &&(static_cast <bool> (TemplateParams && TemplateParams ->size() > 0 && "No template parameters") ? void (0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\"" , "clang/lib/Sema/SemaTemplate.cpp", 1826, __extension__ __PRETTY_FUNCTION__ )) |
| 1826 | "No template parameters")(static_cast <bool> (TemplateParams && TemplateParams ->size() > 0 && "No template parameters") ? void (0) : __assert_fail ("TemplateParams && TemplateParams->size() > 0 && \"No template parameters\"" , "clang/lib/Sema/SemaTemplate.cpp", 1826, __extension__ __PRETTY_FUNCTION__ )); |
| 1827 | assert(TUK != TUK_Reference && "Can only declare or define class templates")(static_cast <bool> (TUK != TUK_Reference && "Can only declare or define class templates" ) ? void (0) : __assert_fail ("TUK != TUK_Reference && \"Can only declare or define class templates\"" , "clang/lib/Sema/SemaTemplate.cpp", 1827, __extension__ __PRETTY_FUNCTION__ )); |
| 1828 | bool Invalid = false; |
| 1829 | |
| 1830 | // Check that we can declare a template here. |
| 1831 | if (CheckTemplateDeclScope(S, TemplateParams)) |
| 1832 | return true; |
| 1833 | |
| 1834 | TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
| 1835 | assert(Kind != TTK_Enum && "can't build template of enumerated type")(static_cast <bool> (Kind != TTK_Enum && "can't build template of enumerated type" ) ? void (0) : __assert_fail ("Kind != TTK_Enum && \"can't build template of enumerated type\"" , "clang/lib/Sema/SemaTemplate.cpp", 1835, __extension__ __PRETTY_FUNCTION__ )); |
| 1836 | |
| 1837 | // There is no such thing as an unnamed class template. |
| 1838 | if (!Name) { |
| 1839 | Diag(KWLoc, diag::err_template_unnamed_class); |
| 1840 | return true; |
| 1841 | } |
| 1842 | |
| 1843 | // Find any previous declaration with this name. For a friend with no |
| 1844 | // scope explicitly specified, we only look for tag declarations (per |
| 1845 | // C++11 [basic.lookup.elab]p2). |
| 1846 | DeclContext *SemanticContext; |
| 1847 | LookupResult Previous(*this, Name, NameLoc, |
| 1848 | (SS.isEmpty() && TUK == TUK_Friend) |
| 1849 | ? LookupTagName : LookupOrdinaryName, |
| 1850 | forRedeclarationInCurContext()); |
| 1851 | if (SS.isNotEmpty() && !SS.isInvalid()) { |
| 1852 | SemanticContext = computeDeclContext(SS, true); |
| 1853 | if (!SemanticContext) { |
| 1854 | // FIXME: Horrible, horrible hack! We can't currently represent this |
| 1855 | // in the AST, and historically we have just ignored such friend |
| 1856 | // class templates, so don't complain here. |
| 1857 | Diag(NameLoc, TUK == TUK_Friend |
| 1858 | ? diag::warn_template_qualified_friend_ignored |
| 1859 | : diag::err_template_qualified_declarator_no_match) |
| 1860 | << SS.getScopeRep() << SS.getRange(); |
| 1861 | return TUK != TUK_Friend; |
| 1862 | } |
| 1863 | |
| 1864 | if (RequireCompleteDeclContext(SS, SemanticContext)) |
| 1865 | return true; |
| 1866 | |
| 1867 | // If we're adding a template to a dependent context, we may need to |
| 1868 | // rebuilding some of the types used within the template parameter list, |
| 1869 | // now that we know what the current instantiation is. |
| 1870 | if (SemanticContext->isDependentContext()) { |
| 1871 | ContextRAII SavedContext(*this, SemanticContext); |
| 1872 | if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) |
| 1873 | Invalid = true; |
| 1874 | } else if (TUK != TUK_Friend && TUK != TUK_Reference) |
| 1875 | diagnoseQualifiedDeclaration(SS, SemanticContext, Name, NameLoc, false); |
| 1876 | |
| 1877 | LookupQualifiedName(Previous, SemanticContext); |
| 1878 | } else { |
| 1879 | SemanticContext = CurContext; |
| 1880 | |
| 1881 | // C++14 [class.mem]p14: |
| 1882 | // If T is the name of a class, then each of the following shall have a |
| 1883 | // name different from T: |
| 1884 | // -- every member template of class T |
| 1885 | if (TUK != TUK_Friend && |
| 1886 | DiagnoseClassNameShadow(SemanticContext, |
| 1887 | DeclarationNameInfo(Name, NameLoc))) |
| 1888 | return true; |
| 1889 | |
| 1890 | LookupName(Previous, S); |
| 1891 | } |
| 1892 | |
| 1893 | if (Previous.isAmbiguous()) |
| 1894 | return true; |
| 1895 | |
| 1896 | NamedDecl *PrevDecl = nullptr; |
| 1897 | if (Previous.begin() != Previous.end()) |
| 1898 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); |
| 1899 | |
| 1900 | if (PrevDecl && PrevDecl->isTemplateParameter()) { |
| 1901 | // Maybe we will complain about the shadowed template parameter. |
| 1902 | DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); |
| 1903 | // Just pretend that we didn't see the previous declaration. |
| 1904 | PrevDecl = nullptr; |
| 1905 | } |
| 1906 | |
| 1907 | // If there is a previous declaration with the same name, check |
| 1908 | // whether this is a valid redeclaration. |
| 1909 | ClassTemplateDecl *PrevClassTemplate = |
| 1910 | dyn_cast_or_null<ClassTemplateDecl>(PrevDecl); |
| 1911 | |
| 1912 | // We may have found the injected-class-name of a class template, |
| 1913 | // class template partial specialization, or class template specialization. |
| 1914 | // In these cases, grab the template that is being defined or specialized. |
| 1915 | if (!PrevClassTemplate && PrevDecl && isa<CXXRecordDecl>(PrevDecl) && |
| 1916 | cast<CXXRecordDecl>(PrevDecl)->isInjectedClassName()) { |
| 1917 | PrevDecl = cast<CXXRecordDecl>(PrevDecl->getDeclContext()); |
| 1918 | PrevClassTemplate |
| 1919 | = cast<CXXRecordDecl>(PrevDecl)->getDescribedClassTemplate(); |
| 1920 | if (!PrevClassTemplate && isa<ClassTemplateSpecializationDecl>(PrevDecl)) { |
| 1921 | PrevClassTemplate |
| 1922 | = cast<ClassTemplateSpecializationDecl>(PrevDecl) |
| 1923 | ->getSpecializedTemplate(); |
| 1924 | } |
| 1925 | } |
| 1926 | |
| 1927 | if (TUK == TUK_Friend) { |
| 1928 | // C++ [namespace.memdef]p3: |
| 1929 | // [...] When looking for a prior declaration of a class or a function |
| 1930 | // declared as a friend, and when the name of the friend class or |
| 1931 | // function is neither a qualified name nor a template-id, scopes outside |
| 1932 | // the innermost enclosing namespace scope are not considered. |
| 1933 | if (!SS.isSet()) { |
| 1934 | DeclContext *OutermostContext = CurContext; |
| 1935 | while (!OutermostContext->isFileContext()) |
| 1936 | OutermostContext = OutermostContext->getLookupParent(); |
| 1937 | |
| 1938 | if (PrevDecl && |
| 1939 | (OutermostContext->Equals(PrevDecl->getDeclContext()) || |
| 1940 | OutermostContext->Encloses(PrevDecl->getDeclContext()))) { |
| 1941 | SemanticContext = PrevDecl->getDeclContext(); |
| 1942 | } else { |
| 1943 | // Declarations in outer scopes don't matter. However, the outermost |
| 1944 | // context we computed is the semantic context for our new |
| 1945 | // declaration. |
| 1946 | PrevDecl = PrevClassTemplate = nullptr; |
| 1947 | SemanticContext = OutermostContext; |
| 1948 | |
| 1949 | // Check that the chosen semantic context doesn't already contain a |
| 1950 | // declaration of this name as a non-tag type. |
| 1951 | Previous.clear(LookupOrdinaryName); |
| 1952 | DeclContext *LookupContext = SemanticContext; |
| 1953 | while (LookupContext->isTransparentContext()) |
| 1954 | LookupContext = LookupContext->getLookupParent(); |
| 1955 | LookupQualifiedName(Previous, LookupContext); |
| 1956 | |
| 1957 | if (Previous.isAmbiguous()) |
| 1958 | return true; |
| 1959 | |
| 1960 | if (Previous.begin() != Previous.end()) |
| 1961 | PrevDecl = (*Previous.begin())->getUnderlyingDecl(); |
| 1962 | } |
| 1963 | } |
| 1964 | } else if (PrevDecl && |
| 1965 | !isDeclInScope(Previous.getRepresentativeDecl(), SemanticContext, |
| 1966 | S, SS.isValid())) |
| 1967 | PrevDecl = PrevClassTemplate = nullptr; |
| 1968 | |
| 1969 | if (auto *Shadow = dyn_cast_or_null<UsingShadowDecl>( |
| 1970 | PrevDecl ? Previous.getRepresentativeDecl() : nullptr)) { |
| 1971 | if (SS.isEmpty() && |
| 1972 | !(PrevClassTemplate && |
| 1973 | PrevClassTemplate->getDeclContext()->getRedeclContext()->Equals( |
| 1974 | SemanticContext->getRedeclContext()))) { |
| 1975 | Diag(KWLoc, diag::err_using_decl_conflict_reverse); |
| 1976 | Diag(Shadow->getTargetDecl()->getLocation(), |
| 1977 | diag::note_using_decl_target); |
| 1978 | Diag(Shadow->getIntroducer()->getLocation(), diag::note_using_decl) << 0; |
| 1979 | // Recover by ignoring the old declaration. |
| 1980 | PrevDecl = PrevClassTemplate = nullptr; |
| 1981 | } |
| 1982 | } |
| 1983 | |
| 1984 | if (PrevClassTemplate) { |
| 1985 | // Ensure that the template parameter lists are compatible. Skip this check |
| 1986 | // for a friend in a dependent context: the template parameter list itself |
| 1987 | // could be dependent. |
| 1988 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && |
| 1989 | !TemplateParameterListsAreEqual(TemplateParams, |
| 1990 | PrevClassTemplate->getTemplateParameters(), |
| 1991 | /*Complain=*/true, |
| 1992 | TPL_TemplateMatch)) |
| 1993 | return true; |
| 1994 | |
| 1995 | // C++ [temp.class]p4: |
| 1996 | // In a redeclaration, partial specialization, explicit |
| 1997 | // specialization or explicit instantiation of a class template, |
| 1998 | // the class-key shall agree in kind with the original class |
| 1999 | // template declaration (7.1.5.3). |
| 2000 | RecordDecl *PrevRecordDecl = PrevClassTemplate->getTemplatedDecl(); |
| 2001 | if (!isAcceptableTagRedeclaration(PrevRecordDecl, Kind, |
| 2002 | TUK == TUK_Definition, KWLoc, Name)) { |
| 2003 | Diag(KWLoc, diag::err_use_with_wrong_tag) |
| 2004 | << Name |
| 2005 | << FixItHint::CreateReplacement(KWLoc, PrevRecordDecl->getKindName()); |
| 2006 | Diag(PrevRecordDecl->getLocation(), diag::note_previous_use); |
| 2007 | Kind = PrevRecordDecl->getTagKind(); |
| 2008 | } |
| 2009 | |
| 2010 | // Check for redefinition of this class template. |
| 2011 | if (TUK == TUK_Definition) { |
| 2012 | if (TagDecl *Def = PrevRecordDecl->getDefinition()) { |
| 2013 | // If we have a prior definition that is not visible, treat this as |
| 2014 | // simply making that previous definition visible. |
| 2015 | NamedDecl *Hidden = nullptr; |
| 2016 | if (SkipBody && !hasVisibleDefinition(Def, &Hidden)) { |
| 2017 | SkipBody->ShouldSkip = true; |
| 2018 | SkipBody->Previous = Def; |
| 2019 | auto *Tmpl = cast<CXXRecordDecl>(Hidden)->getDescribedClassTemplate(); |
| 2020 | assert(Tmpl && "original definition of a class template is not a "(static_cast <bool> (Tmpl && "original definition of a class template is not a " "class template?") ? void (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\"" , "clang/lib/Sema/SemaTemplate.cpp", 2021, __extension__ __PRETTY_FUNCTION__ )) |
| 2021 | "class template?")(static_cast <bool> (Tmpl && "original definition of a class template is not a " "class template?") ? void (0) : __assert_fail ("Tmpl && \"original definition of a class template is not a \" \"class template?\"" , "clang/lib/Sema/SemaTemplate.cpp", 2021, __extension__ __PRETTY_FUNCTION__ )); |
| 2022 | makeMergedDefinitionVisible(Hidden); |
| 2023 | makeMergedDefinitionVisible(Tmpl); |
| 2024 | } else { |
| 2025 | Diag(NameLoc, diag::err_redefinition) << Name; |
| 2026 | Diag(Def->getLocation(), diag::note_previous_definition); |
| 2027 | // FIXME: Would it make sense to try to "forget" the previous |
| 2028 | // definition, as part of error recovery? |
| 2029 | return true; |
| 2030 | } |
| 2031 | } |
| 2032 | } |
| 2033 | } else if (PrevDecl) { |
| 2034 | // C++ [temp]p5: |
| 2035 | // A class template shall not have the same name as any other |
| 2036 | // template, class, function, object, enumeration, enumerator, |
| 2037 | // namespace, or type in the same scope (3.3), except as specified |
| 2038 | // in (14.5.4). |
| 2039 | Diag(NameLoc, diag::err_redefinition_different_kind) << Name; |
| 2040 | Diag(PrevDecl->getLocation(), diag::note_previous_definition); |
| 2041 | return true; |
| 2042 | } |
| 2043 | |
| 2044 | // Check the template parameter list of this declaration, possibly |
| 2045 | // merging in the template parameter list from the previous class |
| 2046 | // template declaration. Skip this check for a friend in a dependent |
| 2047 | // context, because the template parameter list might be dependent. |
| 2048 | if (!(TUK == TUK_Friend && CurContext->isDependentContext()) && |
| 2049 | CheckTemplateParameterList( |
| 2050 | TemplateParams, |
| 2051 | PrevClassTemplate |
| 2052 | ? PrevClassTemplate->getMostRecentDecl()->getTemplateParameters() |
| 2053 | : nullptr, |
| 2054 | (SS.isSet() && SemanticContext && SemanticContext->isRecord() && |
| 2055 | SemanticContext->isDependentContext()) |
| 2056 | ? TPC_ClassTemplateMember |
| 2057 | : TUK == TUK_Friend ? TPC_FriendClassTemplate : TPC_ClassTemplate, |
| 2058 | SkipBody)) |
| 2059 | Invalid = true; |
| 2060 | |
| 2061 | if (SS.isSet()) { |
| 2062 | // If the name of the template was qualified, we must be defining the |
| 2063 | // template out-of-line. |
| 2064 | if (!SS.isInvalid() && !Invalid && !PrevClassTemplate) { |
| 2065 | Diag(NameLoc, TUK == TUK_Friend ? diag::err_friend_decl_does_not_match |
| 2066 | : diag::err_member_decl_does_not_match) |
| 2067 | << Name << SemanticContext << /*IsDefinition*/true << SS.getRange(); |
| 2068 | Invalid = true; |
| 2069 | } |
| 2070 | } |
| 2071 | |
| 2072 | // If this is a templated friend in a dependent context we should not put it |
| 2073 | // on the redecl chain. In some cases, the templated friend can be the most |
| 2074 | // recent declaration tricking the template instantiator to make substitutions |
| 2075 | // there. |
| 2076 | // FIXME: Figure out how to combine with shouldLinkDependentDeclWithPrevious |
| 2077 | bool ShouldAddRedecl |
| 2078 | = !(TUK == TUK_Friend && CurContext->isDependentContext()); |
| 2079 | |
| 2080 | CXXRecordDecl *NewClass = |
| 2081 | CXXRecordDecl::Create(Context, Kind, SemanticContext, KWLoc, NameLoc, Name, |
| 2082 | PrevClassTemplate && ShouldAddRedecl ? |
| 2083 | PrevClassTemplate->getTemplatedDecl() : nullptr, |
| 2084 | /*DelayTypeCreation=*/true); |
| 2085 | SetNestedNameSpecifier(*this, NewClass, SS); |
| 2086 | if (NumOuterTemplateParamLists > 0) |
| 2087 | NewClass->setTemplateParameterListsInfo( |
| 2088 | Context, |
| 2089 | llvm::ArrayRef(OuterTemplateParamLists, NumOuterTemplateParamLists)); |
| 2090 | |
| 2091 | // Add alignment attributes if necessary; these attributes are checked when |
| 2092 | // the ASTContext lays out the structure. |
| 2093 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) { |
| 2094 | AddAlignmentAttributesForRecord(NewClass); |
| 2095 | AddMsStructLayoutForRecord(NewClass); |
| 2096 | } |
| 2097 | |
| 2098 | ClassTemplateDecl *NewTemplate |
| 2099 | = ClassTemplateDecl::Create(Context, SemanticContext, NameLoc, |
| 2100 | DeclarationName(Name), TemplateParams, |
| 2101 | NewClass); |
| 2102 | |
| 2103 | if (ShouldAddRedecl) |
| 2104 | NewTemplate->setPreviousDecl(PrevClassTemplate); |
| 2105 | |
| 2106 | NewClass->setDescribedClassTemplate(NewTemplate); |
| 2107 | |
| 2108 | if (ModulePrivateLoc.isValid()) |
| 2109 | NewTemplate->setModulePrivate(); |
| 2110 | |
| 2111 | // Build the type for the class template declaration now. |
| 2112 | QualType T = NewTemplate->getInjectedClassNameSpecialization(); |
| 2113 | T = Context.getInjectedClassNameType(NewClass, T); |
| 2114 | assert(T->isDependentType() && "Class template type is not dependent?")(static_cast <bool> (T->isDependentType() && "Class template type is not dependent?") ? void (0) : __assert_fail ("T->isDependentType() && \"Class template type is not dependent?\"" , "clang/lib/Sema/SemaTemplate.cpp", 2114, __extension__ __PRETTY_FUNCTION__ )); |
| 2115 | (void)T; |
| 2116 | |
| 2117 | // If we are providing an explicit specialization of a member that is a |
| 2118 | // class template, make a note of that. |
| 2119 | if (PrevClassTemplate && |
| 2120 | PrevClassTemplate->getInstantiatedFromMemberTemplate()) |
| 2121 | PrevClassTemplate->setMemberSpecialization(); |
| 2122 | |
| 2123 | // Set the access specifier. |
| 2124 | if (!Invalid && TUK != TUK_Friend && NewTemplate->getDeclContext()->isRecord()) |
| 2125 | SetMemberAccessSpecifier(NewTemplate, PrevClassTemplate, AS); |
| 2126 | |
| 2127 | // Set the lexical context of these templates |
| 2128 | NewClass->setLexicalDeclContext(CurContext); |
| 2129 | NewTemplate->setLexicalDeclContext(CurContext); |
| 2130 | |
| 2131 | if (TUK == TUK_Definition && (!SkipBody || !SkipBody->ShouldSkip)) |
| 2132 | NewClass->startDefinition(); |
| 2133 | |
| 2134 | ProcessDeclAttributeList(S, NewClass, Attr); |
| 2135 | |
| 2136 | if (PrevClassTemplate) |
| 2137 | mergeDeclAttributes(NewClass, PrevClassTemplate->getTemplatedDecl()); |
| 2138 | |
| 2139 | AddPushedVisibilityAttribute(NewClass); |
| 2140 | inferGslOwnerPointerAttribute(NewClass); |
| 2141 | |
| 2142 | if (TUK != TUK_Friend) { |
| 2143 | // Per C++ [basic.scope.temp]p2, skip the template parameter scopes. |
| 2144 | Scope *Outer = S; |
| 2145 | while ((Outer->getFlags() & Scope::TemplateParamScope) != 0) |
| 2146 | Outer = Outer->getParent(); |
| 2147 | PushOnScopeChains(NewTemplate, Outer); |
| 2148 | } else { |
| 2149 | if (PrevClassTemplate && PrevClassTemplate->getAccess() != AS_none) { |
| 2150 | NewTemplate->setAccess(PrevClassTemplate->getAccess()); |
| 2151 | NewClass->setAccess(PrevClassTemplate->getAccess()); |
| 2152 | } |
| 2153 | |
| 2154 | NewTemplate->setObjectOfFriendDecl(); |
| 2155 | |
| 2156 | // Friend templates are visible in fairly strange ways. |
| 2157 | if (!CurContext->isDependentContext()) { |
| 2158 | DeclContext *DC = SemanticContext->getRedeclContext(); |
| 2159 | DC->makeDeclVisibleInContext(NewTemplate); |
| 2160 | if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) |
| 2161 | PushOnScopeChains(NewTemplate, EnclosingScope, |
| 2162 | /* AddToContext = */ false); |
| 2163 | } |
| 2164 | |
| 2165 | FriendDecl *Friend = FriendDecl::Create( |
| 2166 | Context, CurContext, NewClass->getLocation(), NewTemplate, FriendLoc); |
| 2167 | Friend->setAccess(AS_public); |
| 2168 | CurContext->addDecl(Friend); |
| 2169 | } |
| 2170 | |
| 2171 | if (PrevClassTemplate) |
| 2172 | CheckRedeclarationInModule(NewTemplate, PrevClassTemplate); |
| 2173 | |
| 2174 | if (Invalid) { |
| 2175 | NewTemplate->setInvalidDecl(); |
| 2176 | NewClass->setInvalidDecl(); |
| 2177 | } |
| 2178 | |
| 2179 | ActOnDocumentableDecl(NewTemplate); |
| 2180 | |
| 2181 | if (SkipBody && SkipBody->ShouldSkip) |
| 2182 | return SkipBody->Previous; |
| 2183 | |
| 2184 | return NewTemplate; |
| 2185 | } |
| 2186 | |
| 2187 | namespace { |
| 2188 | /// Tree transform to "extract" a transformed type from a class template's |
| 2189 | /// constructor to a deduction guide. |
| 2190 | class ExtractTypeForDeductionGuide |
| 2191 | : public TreeTransform<ExtractTypeForDeductionGuide> { |
| 2192 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs; |
| 2193 | |
| 2194 | public: |
| 2195 | typedef TreeTransform<ExtractTypeForDeductionGuide> Base; |
| 2196 | ExtractTypeForDeductionGuide( |
| 2197 | Sema &SemaRef, |
| 2198 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) |
| 2199 | : Base(SemaRef), MaterializedTypedefs(MaterializedTypedefs) {} |
| 2200 | |
| 2201 | TypeSourceInfo *transform(TypeSourceInfo *TSI) { return TransformType(TSI); } |
| 2202 | |
| 2203 | QualType TransformTypedefType(TypeLocBuilder &TLB, TypedefTypeLoc TL) { |
| 2204 | ASTContext &Context = SemaRef.getASTContext(); |
| 2205 | TypedefNameDecl *OrigDecl = TL.getTypedefNameDecl(); |
| 2206 | TypedefNameDecl *Decl = OrigDecl; |
| 2207 | // Transform the underlying type of the typedef and clone the Decl only if |
| 2208 | // the typedef has a dependent context. |
| 2209 | if (OrigDecl->getDeclContext()->isDependentContext()) { |
| 2210 | TypeLocBuilder InnerTLB; |
| 2211 | QualType Transformed = |
| 2212 | TransformType(InnerTLB, OrigDecl->getTypeSourceInfo()->getTypeLoc()); |
| 2213 | TypeSourceInfo *TSI = InnerTLB.getTypeSourceInfo(Context, Transformed); |
| 2214 | if (isa<TypeAliasDecl>(OrigDecl)) |
| 2215 | Decl = TypeAliasDecl::Create( |
| 2216 | Context, Context.getTranslationUnitDecl(), OrigDecl->getBeginLoc(), |
| 2217 | OrigDecl->getLocation(), OrigDecl->getIdentifier(), TSI); |
| 2218 | else { |
| 2219 | assert(isa<TypedefDecl>(OrigDecl) && "Not a Type alias or typedef")(static_cast <bool> (isa<TypedefDecl>(OrigDecl) && "Not a Type alias or typedef") ? void (0) : __assert_fail ("isa<TypedefDecl>(OrigDecl) && \"Not a Type alias or typedef\"" , "clang/lib/Sema/SemaTemplate.cpp", 2219, __extension__ __PRETTY_FUNCTION__ )); |
| 2220 | Decl = TypedefDecl::Create( |
| 2221 | Context, Context.getTranslationUnitDecl(), OrigDecl->getBeginLoc(), |
| 2222 | OrigDecl->getLocation(), OrigDecl->getIdentifier(), TSI); |
| 2223 | } |
| 2224 | MaterializedTypedefs.push_back(Decl); |
| 2225 | } |
| 2226 | |
| 2227 | QualType TDTy = Context.getTypedefType(Decl); |
| 2228 | TypedefTypeLoc TypedefTL = TLB.push<TypedefTypeLoc>(TDTy); |
| 2229 | TypedefTL.setNameLoc(TL.getNameLoc()); |
| 2230 | |
| 2231 | return TDTy; |
| 2232 | } |
| 2233 | }; |
| 2234 | |
| 2235 | /// Transform to convert portions of a constructor declaration into the |
| 2236 | /// corresponding deduction guide, per C++1z [over.match.class.deduct]p1. |
| 2237 | struct ConvertConstructorToDeductionGuideTransform { |
| 2238 | ConvertConstructorToDeductionGuideTransform(Sema &S, |
| 2239 | ClassTemplateDecl *Template) |
| 2240 | : SemaRef(S), Template(Template) {} |
| 2241 | |
| 2242 | Sema &SemaRef; |
| 2243 | ClassTemplateDecl *Template; |
| 2244 | |
| 2245 | DeclContext *DC = Template->getDeclContext(); |
| 2246 | CXXRecordDecl *Primary = Template->getTemplatedDecl(); |
| 2247 | DeclarationName DeductionGuideName = |
| 2248 | SemaRef.Context.DeclarationNames.getCXXDeductionGuideName(Template); |
| 2249 | |
| 2250 | QualType DeducedType = SemaRef.Context.getTypeDeclType(Primary); |
| 2251 | |
| 2252 | // Index adjustment to apply to convert depth-1 template parameters into |
| 2253 | // depth-0 template parameters. |
| 2254 | unsigned Depth1IndexAdjustment = Template->getTemplateParameters()->size(); |
| 2255 | |
| 2256 | /// Transform a constructor declaration into a deduction guide. |
| 2257 | NamedDecl *transformConstructor(FunctionTemplateDecl *FTD, |
| 2258 | CXXConstructorDecl *CD) { |
| 2259 | SmallVector<TemplateArgument, 16> SubstArgs; |
| 2260 | |
| 2261 | LocalInstantiationScope Scope(SemaRef); |
| 2262 | |
| 2263 | // C++ [over.match.class.deduct]p1: |
| 2264 | // -- For each constructor of the class template designated by the |
| 2265 | // template-name, a function template with the following properties: |
| 2266 | |
| 2267 | // -- The template parameters are the template parameters of the class |
| 2268 | // template followed by the template parameters (including default |
| 2269 | // template arguments) of the constructor, if any. |
| 2270 | TemplateParameterList *TemplateParams = Template->getTemplateParameters(); |
| 2271 | if (FTD) { |
| 2272 | TemplateParameterList *InnerParams = FTD->getTemplateParameters(); |
| 2273 | SmallVector<NamedDecl *, 16> AllParams; |
| 2274 | AllParams.reserve(TemplateParams->size() + InnerParams->size()); |
| 2275 | AllParams.insert(AllParams.begin(), |
| 2276 | TemplateParams->begin(), TemplateParams->end()); |
| 2277 | SubstArgs.reserve(InnerParams->size()); |
| 2278 | |
| 2279 | // Later template parameters could refer to earlier ones, so build up |
| 2280 | // a list of substituted template arguments as we go. |
| 2281 | for (NamedDecl *Param : *InnerParams) { |
| 2282 | MultiLevelTemplateArgumentList Args; |
| 2283 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
| 2284 | Args.addOuterTemplateArguments(SubstArgs); |
| 2285 | Args.addOuterRetainedLevel(); |
| 2286 | NamedDecl *NewParam = transformTemplateParameter(Param, Args); |
| 2287 | if (!NewParam) |
| 2288 | return nullptr; |
| 2289 | AllParams.push_back(NewParam); |
| 2290 | SubstArgs.push_back(SemaRef.Context.getCanonicalTemplateArgument( |
| 2291 | SemaRef.Context.getInjectedTemplateArg(NewParam))); |
| 2292 | } |
| 2293 | |
| 2294 | // Substitute new template parameters into requires-clause if present. |
| 2295 | Expr *RequiresClause = nullptr; |
| 2296 | if (Expr *InnerRC = InnerParams->getRequiresClause()) { |
| 2297 | MultiLevelTemplateArgumentList Args; |
| 2298 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
| 2299 | Args.addOuterTemplateArguments(SubstArgs); |
| 2300 | Args.addOuterRetainedLevel(); |
| 2301 | ExprResult E = SemaRef.SubstExpr(InnerRC, Args); |
| 2302 | if (E.isInvalid()) |
| 2303 | return nullptr; |
| 2304 | RequiresClause = E.getAs<Expr>(); |
| 2305 | } |
| 2306 | |
| 2307 | TemplateParams = TemplateParameterList::Create( |
| 2308 | SemaRef.Context, InnerParams->getTemplateLoc(), |
| 2309 | InnerParams->getLAngleLoc(), AllParams, InnerParams->getRAngleLoc(), |
| 2310 | RequiresClause); |
| 2311 | } |
| 2312 | |
| 2313 | // If we built a new template-parameter-list, track that we need to |
| 2314 | // substitute references to the old parameters into references to the |
| 2315 | // new ones. |
| 2316 | MultiLevelTemplateArgumentList Args; |
| 2317 | Args.setKind(TemplateSubstitutionKind::Rewrite); |
| 2318 | if (FTD) { |
| 2319 | Args.addOuterTemplateArguments(SubstArgs); |
| 2320 | Args.addOuterRetainedLevel(); |
| 2321 | } |
| 2322 | |
| 2323 | FunctionProtoTypeLoc FPTL = CD->getTypeSourceInfo()->getTypeLoc() |
| 2324 | .getAsAdjusted<FunctionProtoTypeLoc>(); |
| 2325 | assert(FPTL && "no prototype for constructor declaration")(static_cast <bool> (FPTL && "no prototype for constructor declaration" ) ? void (0) : __assert_fail ("FPTL && \"no prototype for constructor declaration\"" , "clang/lib/Sema/SemaTemplate.cpp", 2325, __extension__ __PRETTY_FUNCTION__ )); |
| 2326 | |
| 2327 | // Transform the type of the function, adjusting the return type and |
| 2328 | // replacing references to the old parameters with references to the |
| 2329 | // new ones. |
| 2330 | TypeLocBuilder TLB; |
| 2331 | SmallVector<ParmVarDecl*, 8> Params; |
| 2332 | SmallVector<TypedefNameDecl *, 4> MaterializedTypedefs; |
| 2333 | QualType NewType = transformFunctionProtoType(TLB, FPTL, Params, Args, |
| 2334 | MaterializedTypedefs); |
| 2335 | if (NewType.isNull()) |
| 2336 | return nullptr; |
| 2337 | TypeSourceInfo *NewTInfo = TLB.getTypeSourceInfo(SemaRef.Context, NewType); |
| 2338 | |
| 2339 | return buildDeductionGuide(TemplateParams, CD, CD->getExplicitSpecifier(), |
| 2340 | NewTInfo, CD->getBeginLoc(), CD->getLocation(), |
| 2341 | CD->getEndLoc(), MaterializedTypedefs); |
| 2342 | } |
| 2343 | |
| 2344 | /// Build a deduction guide with the specified parameter types. |
| 2345 | NamedDecl *buildSimpleDeductionGuide(MutableArrayRef<QualType> ParamTypes) { |
| 2346 | SourceLocation Loc = Template->getLocation(); |
| 2347 | |
| 2348 | // Build the requested type. |
| 2349 | FunctionProtoType::ExtProtoInfo EPI; |
| 2350 | EPI.HasTrailingReturn = true; |
| 2351 | QualType Result = SemaRef.BuildFunctionType(DeducedType, ParamTypes, Loc, |
| 2352 | DeductionGuideName, EPI); |
| 2353 | TypeSourceInfo *TSI = SemaRef.Context.getTrivialTypeSourceInfo(Result, Loc); |
| 2354 | |
| 2355 | FunctionProtoTypeLoc FPTL = |
| 2356 | TSI->getTypeLoc().castAs<FunctionProtoTypeLoc>(); |
| 2357 | |
| 2358 | // Build the parameters, needed during deduction / substitution. |
| 2359 | SmallVector<ParmVarDecl*, 4> Params; |
| 2360 | for (auto T : ParamTypes) { |
| 2361 | ParmVarDecl *NewParam = ParmVarDecl::Create( |
| 2362 | SemaRef.Context, DC, Loc, Loc, nullptr, T, |
| 2363 | SemaRef.Context.getTrivialTypeSourceInfo(T, Loc), SC_None, nullptr); |
| 2364 | NewParam->setScopeInfo(0, Params.size()); |
| 2365 | FPTL.setParam(Params.size(), NewParam); |
| 2366 | Params.push_back(NewParam); |
| 2367 | } |
| 2368 | |
| 2369 | return buildDeductionGuide(Template->getTemplateParameters(), nullptr, |
| 2370 | ExplicitSpecifier(), TSI, Loc, Loc, Loc); |
| 2371 | } |
| 2372 | |
| 2373 | private: |
| 2374 | /// Transform a constructor template parameter into a deduction guide template |
| 2375 | /// parameter, rebuilding any internal references to earlier parameters and |
| 2376 | /// renumbering as we go. |
| 2377 | NamedDecl *transformTemplateParameter(NamedDecl *TemplateParam, |
| 2378 | MultiLevelTemplateArgumentList &Args) { |
| 2379 | if (auto *TTP = dyn_cast<TemplateTypeParmDecl>(TemplateParam)) { |
| 2380 | // TemplateTypeParmDecl's index cannot be changed after creation, so |
| 2381 | // substitute it directly. |
| 2382 | auto *NewTTP = TemplateTypeParmDecl::Create( |
| 2383 | SemaRef.Context, DC, TTP->getBeginLoc(), TTP->getLocation(), |
| 2384 | /*Depth*/ 0, Depth1IndexAdjustment + TTP->getIndex(), |
| 2385 | TTP->getIdentifier(), TTP->wasDeclaredWithTypename(), |
| 2386 | TTP->isParameterPack(), TTP->hasTypeConstraint(), |
| 2387 | TTP->isExpandedParameterPack() |
| 2388 | ? std::optional<unsigned>(TTP->getNumExpansionParameters()) |
| 2389 | : std::nullopt); |
| 2390 | if (const auto *TC = TTP->getTypeConstraint()) |
| 2391 | SemaRef.SubstTypeConstraint(NewTTP, TC, Args, |
| 2392 | /*EvaluateConstraint*/ true); |
| 2393 | if (TTP->hasDefaultArgument()) { |
| 2394 | TypeSourceInfo *InstantiatedDefaultArg = |
| 2395 | SemaRef.SubstType(TTP->getDefaultArgumentInfo(), Args, |
| 2396 | TTP->getDefaultArgumentLoc(), TTP->getDeclName()); |
| 2397 | if (InstantiatedDefaultArg) |
| 2398 | NewTTP->setDefaultArgument(InstantiatedDefaultArg); |
| 2399 | } |
| 2400 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(TemplateParam, |
| 2401 | NewTTP); |
| 2402 | return NewTTP; |
| 2403 | } |
| 2404 | |
| 2405 | if (auto *TTP = dyn_cast<TemplateTemplateParmDecl>(TemplateParam)) |
| 2406 | return transformTemplateParameterImpl(TTP, Args); |
| 2407 | |
| 2408 | return transformTemplateParameterImpl( |
| 2409 | cast<NonTypeTemplateParmDecl>(TemplateParam), Args); |
| 2410 | } |
| 2411 | template<typename TemplateParmDecl> |
| 2412 | TemplateParmDecl * |
| 2413 | transformTemplateParameterImpl(TemplateParmDecl *OldParam, |
| 2414 | MultiLevelTemplateArgumentList &Args) { |
| 2415 | // Ask the template instantiator to do the heavy lifting for us, then adjust |
| 2416 | // the index of the parameter once it's done. |
| 2417 | auto *NewParam = |
| 2418 | cast<TemplateParmDecl>(SemaRef.SubstDecl(OldParam, DC, Args)); |
| 2419 | assert(NewParam->getDepth() == 0 && "unexpected template param depth")(static_cast <bool> (NewParam->getDepth() == 0 && "unexpected template param depth") ? void (0) : __assert_fail ("NewParam->getDepth() == 0 && \"unexpected template param depth\"" , "clang/lib/Sema/SemaTemplate.cpp", 2419, __extension__ __PRETTY_FUNCTION__ )); |
| 2420 | NewParam->setPosition(NewParam->getPosition() + Depth1IndexAdjustment); |
| 2421 | return NewParam; |
| 2422 | } |
| 2423 | |
| 2424 | QualType transformFunctionProtoType( |
| 2425 | TypeLocBuilder &TLB, FunctionProtoTypeLoc TL, |
| 2426 | SmallVectorImpl<ParmVarDecl *> &Params, |
| 2427 | MultiLevelTemplateArgumentList &Args, |
| 2428 | SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) { |
| 2429 | SmallVector<QualType, 4> ParamTypes; |
| 2430 | const FunctionProtoType *T = TL.getTypePtr(); |
| 2431 | |
| 2432 | // -- The types of the function parameters are those of the constructor. |
| 2433 | for (auto *OldParam : TL.getParams()) { |
| 2434 | ParmVarDecl *NewParam = |
| 2435 | transformFunctionTypeParam(OldParam, Args, MaterializedTypedefs); |
| 2436 | if (!NewParam) |
| 2437 | return QualType(); |
| 2438 | ParamTypes.push_back(NewParam->getType()); |
| 2439 | Params.push_back(NewParam); |
| 2440 | } |
| 2441 | |
| 2442 | // -- The return type is the class template specialization designated by |
| 2443 | // the template-name and template arguments corresponding to the |
| 2444 | // template parameters obtained from the class template. |
| 2445 | // |
| 2446 | // We use the injected-class-name type of the primary template instead. |
| 2447 | // This has the convenient property that it is different from any type that |
| 2448 | // the user can write in a deduction-guide (because they cannot enter the |
| 2449 | // context of the template), so implicit deduction guides can never collide |
| 2450 | // with explicit ones. |
| 2451 | QualType ReturnType = DeducedType; |
| 2452 | TLB.pushTypeSpec(ReturnType).setNameLoc(Primary->getLocation()); |
| 2453 | |
| 2454 | // Resolving a wording defect, we also inherit the variadicness of the |
| 2455 | // constructor. |
| 2456 | FunctionProtoType::ExtProtoInfo EPI; |
| 2457 | EPI.Variadic = T->isVariadic(); |
| 2458 | EPI.HasTrailingReturn = true; |
| 2459 | |
| 2460 | QualType Result = SemaRef.BuildFunctionType( |
| 2461 | ReturnType, ParamTypes, TL.getBeginLoc(), DeductionGuideName, EPI); |
| 2462 | if (Result.isNull()) |
| 2463 | return QualType(); |
| 2464 | |
| 2465 | FunctionProtoTypeLoc NewTL = TLB.push<FunctionProtoTypeLoc>(Result); |
| 2466 | NewTL.setLocalRangeBegin(TL.getLocalRangeBegin()); |
| 2467 | NewTL.setLParenLoc(TL.getLParenLoc()); |
| 2468 | NewTL.setRParenLoc(TL.getRParenLoc()); |
| 2469 | NewTL.setExceptionSpecRange(SourceRange()); |
| 2470 | NewTL.setLocalRangeEnd(TL.getLocalRangeEnd()); |
| 2471 | for (unsigned I = 0, E = NewTL.getNumParams(); I != E; ++I) |
| 2472 | NewTL.setParam(I, Params[I]); |
| 2473 | |
| 2474 | return Result; |
| 2475 | } |
| 2476 | |
| 2477 | ParmVarDecl *transformFunctionTypeParam( |
| 2478 | ParmVarDecl *OldParam, MultiLevelTemplateArgumentList &Args, |
| 2479 | llvm::SmallVectorImpl<TypedefNameDecl *> &MaterializedTypedefs) { |
| 2480 | TypeSourceInfo *OldDI = OldParam->getTypeSourceInfo(); |
| 2481 | TypeSourceInfo *NewDI; |
| 2482 | if (auto PackTL = OldDI->getTypeLoc().getAs<PackExpansionTypeLoc>()) { |
| 2483 | // Expand out the one and only element in each inner pack. |
| 2484 | Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, 0); |
| 2485 | NewDI = |
| 2486 | SemaRef.SubstType(PackTL.getPatternLoc(), Args, |
| 2487 | OldParam->getLocation(), OldParam->getDeclName()); |
| 2488 | if (!NewDI) return nullptr; |
| 2489 | NewDI = |
| 2490 | SemaRef.CheckPackExpansion(NewDI, PackTL.getEllipsisLoc(), |
| 2491 | PackTL.getTypePtr()->getNumExpansions()); |
| 2492 | } else |
| 2493 | NewDI = SemaRef.SubstType(OldDI, Args, OldParam->getLocation(), |
| 2494 | OldParam->getDeclName()); |
| 2495 | if (!NewDI) |
| 2496 | return nullptr; |
| 2497 | |
| 2498 | // Extract the type. This (for instance) replaces references to typedef |
| 2499 | // members of the current instantiations with the definitions of those |
| 2500 | // typedefs, avoiding triggering instantiation of the deduced type during |
| 2501 | // deduction. |
| 2502 | NewDI = ExtractTypeForDeductionGuide(SemaRef, MaterializedTypedefs) |
| 2503 | .transform(NewDI); |
| 2504 | |
| 2505 | // Resolving a wording defect, we also inherit default arguments from the |
| 2506 | // constructor. |
| 2507 | ExprResult NewDefArg; |
| 2508 | if (OldParam->hasDefaultArg()) { |
| 2509 | // We don't care what the value is (we won't use it); just create a |
| 2510 | // placeholder to indicate there is a default argument. |
| 2511 | QualType ParamTy = NewDI->getType(); |
| 2512 | NewDefArg = new (SemaRef.Context) |
| 2513 | OpaqueValueExpr(OldParam->getDefaultArg()->getBeginLoc(), |
| 2514 | ParamTy.getNonLValueExprType(SemaRef.Context), |
| 2515 | ParamTy->isLValueReferenceType() ? VK_LValue |
| 2516 | : ParamTy->isRValueReferenceType() ? VK_XValue |
| 2517 | : VK_PRValue); |
| 2518 | } |
| 2519 | |
| 2520 | ParmVarDecl *NewParam = ParmVarDecl::Create(SemaRef.Context, DC, |
| 2521 | OldParam->getInnerLocStart(), |
| 2522 | OldParam->getLocation(), |
| 2523 | OldParam->getIdentifier(), |
| 2524 | NewDI->getType(), |
| 2525 | NewDI, |
| 2526 | OldParam->getStorageClass(), |
| 2527 | NewDefArg.get()); |
| 2528 | NewParam->setScopeInfo(OldParam->getFunctionScopeDepth(), |
| 2529 | OldParam->getFunctionScopeIndex()); |
| 2530 | SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldParam, NewParam); |
| 2531 | return NewParam; |
| 2532 | } |
| 2533 | |
| 2534 | FunctionTemplateDecl *buildDeductionGuide( |
| 2535 | TemplateParameterList *TemplateParams, CXXConstructorDecl *Ctor, |
| 2536 | ExplicitSpecifier ES, TypeSourceInfo *TInfo, SourceLocation LocStart, |
| 2537 | SourceLocation Loc, SourceLocation LocEnd, |
| 2538 | llvm::ArrayRef<TypedefNameDecl *> MaterializedTypedefs = {}) { |
| 2539 | DeclarationNameInfo Name(DeductionGuideName, Loc); |
| 2540 | ArrayRef<ParmVarDecl *> Params = |
| 2541 | TInfo->getTypeLoc().castAs<FunctionProtoTypeLoc>().getParams(); |
| 2542 | |
| 2543 | // Build the implicit deduction guide template. |
| 2544 | auto *Guide = |
| 2545 | CXXDeductionGuideDecl::Create(SemaRef.Context, DC, LocStart, ES, Name, |
| 2546 | TInfo->getType(), TInfo, LocEnd, Ctor); |
| 2547 | Guide->setImplicit(); |
| 2548 | Guide->setParams(Params); |
| 2549 | |
| 2550 | for (auto *Param : Params) |
| 2551 | Param->setDeclContext(Guide); |
| 2552 | for (auto *TD : MaterializedTypedefs) |
| 2553 | TD->setDeclContext(Guide); |
| 2554 | |
| 2555 | auto *GuideTemplate = FunctionTemplateDecl::Create( |
| 2556 | SemaRef.Context, DC, Loc, DeductionGuideName, TemplateParams, Guide); |
| 2557 | GuideTemplate->setImplicit(); |
| 2558 | Guide->setDescribedFunctionTemplate(GuideTemplate); |
| 2559 | |
| 2560 | if (isa<CXXRecordDecl>(DC)) { |
| 2561 | Guide->setAccess(AS_public); |
| 2562 | GuideTemplate->setAccess(AS_public); |
| 2563 | } |
| 2564 | |
| 2565 | DC->addDecl(GuideTemplate); |
| 2566 | return GuideTemplate; |
| 2567 | } |
| 2568 | }; |
| 2569 | } |
| 2570 | |
| 2571 | void Sema::DeclareImplicitDeductionGuides(TemplateDecl *Template, |
| 2572 | SourceLocation Loc) { |
| 2573 | if (CXXRecordDecl *DefRecord = |
| 2574 | cast<CXXRecordDecl>(Template->getTemplatedDecl())->getDefinition()) { |
| 2575 | TemplateDecl *DescribedTemplate = DefRecord->getDescribedClassTemplate(); |
| 2576 | Template = DescribedTemplate ? DescribedTemplate : Template; |
| 2577 | } |
| 2578 | |
| 2579 | DeclContext *DC = Template->getDeclContext(); |
| 2580 | if (DC->isDependentContext()) |
| 2581 | return; |
| 2582 | |
| 2583 | ConvertConstructorToDeductionGuideTransform Transform( |
| 2584 | *this, cast<ClassTemplateDecl>(Template)); |
| 2585 | if (!isCompleteType(Loc, Transform.DeducedType)) |
| 2586 | return; |
| 2587 | |
| 2588 | // Check whether we've already declared deduction guides for this template. |
| 2589 | // FIXME: Consider storing a flag on the template to indicate this. |
| 2590 | auto Existing = DC->lookup(Transform.DeductionGuideName); |
| 2591 | for (auto *D : Existing) |
| 2592 | if (D->isImplicit()) |
| 2593 | return; |
| 2594 | |
| 2595 | // In case we were expanding a pack when we attempted to declare deduction |
| 2596 | // guides, turn off pack expansion for everything we're about to do. |
| 2597 | ArgumentPackSubstitutionIndexRAII SubstIndex(*this, -1); |
| 2598 | // Create a template instantiation record to track the "instantiation" of |
| 2599 | // constructors into deduction guides. |
| 2600 | // FIXME: Add a kind for this to give more meaningful diagnostics. But can |
| 2601 | // this substitution process actually fail? |
| 2602 | InstantiatingTemplate BuildingDeductionGuides(*this, Loc, Template); |
| 2603 | if (BuildingDeductionGuides.isInvalid()) |
| 2604 | return; |
| 2605 | |
| 2606 | // Convert declared constructors into deduction guide templates. |
| 2607 | // FIXME: Skip constructors for which deduction must necessarily fail (those |
| 2608 | // for which some class template parameter without a default argument never |
| 2609 | // appears in a deduced context). |
| 2610 | llvm::SmallPtrSet<NamedDecl *, 8> ProcessedCtors; |
| 2611 | bool AddedAny = false; |
| 2612 | for (NamedDecl *D : LookupConstructors(Transform.Primary)) { |
| 2613 | D = D->getUnderlyingDecl(); |
| 2614 | if (D->isInvalidDecl() || D->isImplicit()) |
| 2615 | continue; |
| 2616 | |
| 2617 | D = cast<NamedDecl>(D->getCanonicalDecl()); |
| 2618 | |
| 2619 | // Within C++20 modules, we may have multiple same constructors in |
| 2620 | // multiple same RecordDecls. And it doesn't make sense to create |
| 2621 | // duplicated deduction guides for the duplicated constructors. |
| 2622 | if (ProcessedCtors.count(D)) |
| 2623 | continue; |
| 2624 | |
| 2625 | auto *FTD = dyn_cast<FunctionTemplateDecl>(D); |
| 2626 | auto *CD = |
| 2627 | dyn_cast_or_null<CXXConstructorDecl>(FTD ? FTD->getTemplatedDecl() : D); |
| 2628 | // Class-scope explicit specializations (MS extension) do not result in |
| 2629 | // deduction guides. |
| 2630 | if (!CD || (!FTD && CD->isFunctionTemplateSpecialization())) |
| 2631 | continue; |
| 2632 | |
| 2633 | // Cannot make a deduction guide when unparsed arguments are present. |
| 2634 | if (llvm::any_of(CD->parameters(), [](ParmVarDecl *P) { |
| 2635 | return !P || P->hasUnparsedDefaultArg(); |
| 2636 | })) |
| 2637 | continue; |
| 2638 | |
| 2639 | ProcessedCtors.insert(D); |
| 2640 | Transform.transformConstructor(FTD, CD); |
| 2641 | AddedAny = true; |
| 2642 | } |
| 2643 | |
| 2644 | // C++17 [over.match.class.deduct] |
| 2645 | // -- If C is not defined or does not declare any constructors, an |
| 2646 | // additional function template derived as above from a hypothetical |
| 2647 | // constructor C(). |
| 2648 | if (!AddedAny) |
| 2649 | Transform.buildSimpleDeductionGuide(std::nullopt); |
| 2650 | |
| 2651 | // -- An additional function template derived as above from a hypothetical |
| 2652 | // constructor C(C), called the copy deduction candidate. |
| 2653 | cast<CXXDeductionGuideDecl>( |
| 2654 | cast<FunctionTemplateDecl>( |
| 2655 | Transform.buildSimpleDeductionGuide(Transform.DeducedType)) |
| 2656 | ->getTemplatedDecl()) |
| 2657 | ->setIsCopyDeductionCandidate(); |
| 2658 | } |
| 2659 | |
| 2660 | /// Diagnose the presence of a default template argument on a |
| 2661 | /// template parameter, which is ill-formed in certain contexts. |
| 2662 | /// |
| 2663 | /// \returns true if the default template argument should be dropped. |
| 2664 | static bool DiagnoseDefaultTemplateArgument(Sema &S, |
| 2665 | Sema::TemplateParamListContext TPC, |
| 2666 | SourceLocation ParamLoc, |
| 2667 | SourceRange DefArgRange) { |
| 2668 | switch (TPC) { |
| 2669 | case Sema::TPC_ClassTemplate: |
| 2670 | case Sema::TPC_VarTemplate: |
| 2671 | case Sema::TPC_TypeAliasTemplate: |
| 2672 | return false; |
| 2673 | |
| 2674 | case Sema::TPC_FunctionTemplate: |
| 2675 | case Sema::TPC_FriendFunctionTemplateDefinition: |
| 2676 | // C++ [temp.param]p9: |
| 2677 | // A default template-argument shall not be specified in a |
| 2678 | // function template declaration or a function template |
| 2679 | // definition [...] |
| 2680 | // If a friend function template declaration specifies a default |
| 2681 | // template-argument, that declaration shall be a definition and shall be |
| 2682 | // the only declaration of the function template in the translation unit. |
| 2683 | // (C++98/03 doesn't have this wording; see DR226). |
| 2684 | S.Diag(ParamLoc, S.getLangOpts().CPlusPlus11 ? |
| 2685 | diag::warn_cxx98_compat_template_parameter_default_in_function_template |
| 2686 | : diag::ext_template_parameter_default_in_function_template) |
| 2687 | << DefArgRange; |
| 2688 | return false; |
| 2689 | |
| 2690 | case Sema::TPC_ClassTemplateMember: |
| 2691 | // C++0x [temp.param]p9: |
| 2692 | // A default template-argument shall not be specified in the |
| 2693 | // template-parameter-lists of the definition of a member of a |
| 2694 | // class template that appears outside of the member's class. |
| 2695 | S.Diag(ParamLoc, diag::err_template_parameter_default_template_member) |
| 2696 | << DefArgRange; |
| 2697 | return true; |
| 2698 | |
| 2699 | case Sema::TPC_FriendClassTemplate: |
| 2700 | case Sema::TPC_FriendFunctionTemplate: |
| 2701 | // C++ [temp.param]p9: |
| 2702 | // A default template-argument shall not be specified in a |
| 2703 | // friend template declaration. |
| 2704 | S.Diag(ParamLoc, diag::err_template_parameter_default_friend_template) |
| 2705 | << DefArgRange; |
| 2706 | return true; |
| 2707 | |
| 2708 | // FIXME: C++0x [temp.param]p9 allows default template-arguments |
| 2709 | // for friend function templates if there is only a single |
| 2710 | // declaration (and it is a definition). Strange! |
| 2711 | } |
| 2712 | |
| 2713 | llvm_unreachable("Invalid TemplateParamListContext!")::llvm::llvm_unreachable_internal("Invalid TemplateParamListContext!" , "clang/lib/Sema/SemaTemplate.cpp", 2713); |
| 2714 | } |
| 2715 | |
| 2716 | /// Check for unexpanded parameter packs within the template parameters |
| 2717 | /// of a template template parameter, recursively. |
| 2718 | static bool DiagnoseUnexpandedParameterPacks(Sema &S, |
| 2719 | TemplateTemplateParmDecl *TTP) { |
| 2720 | // A template template parameter which is a parameter pack is also a pack |
| 2721 | // expansion. |
| 2722 | if (TTP->isParameterPack()) |
| 2723 | return false; |
| 2724 | |
| 2725 | TemplateParameterList *Params = TTP->getTemplateParameters(); |
| 2726 | for (unsigned I = 0, N = Params->size(); I != N; ++I) { |
| 2727 | NamedDecl *P = Params->getParam(I); |
| 2728 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(P)) { |
| 2729 | if (!TTP->isParameterPack()) |
| 2730 | if (const TypeConstraint *TC = TTP->getTypeConstraint()) |
| 2731 | if (TC->hasExplicitTemplateArgs()) |
| 2732 | for (auto &ArgLoc : TC->getTemplateArgsAsWritten()->arguments()) |
| 2733 | if (S.DiagnoseUnexpandedParameterPack(ArgLoc, |
| 2734 | Sema::UPPC_TypeConstraint)) |
| 2735 | return true; |
| 2736 | continue; |
| 2737 | } |
| 2738 | |
| 2739 | if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P)) { |
| 2740 | if (!NTTP->isParameterPack() && |
| 2741 | S.DiagnoseUnexpandedParameterPack(NTTP->getLocation(), |
| 2742 | NTTP->getTypeSourceInfo(), |
| 2743 | Sema::UPPC_NonTypeTemplateParameterType)) |
| 2744 | return true; |
| 2745 | |
| 2746 | continue; |
| 2747 | } |
| 2748 | |
| 2749 | if (TemplateTemplateParmDecl *InnerTTP |
| 2750 | = dyn_cast<TemplateTemplateParmDecl>(P)) |
| 2751 | if (DiagnoseUnexpandedParameterPacks(S, InnerTTP)) |
| 2752 | return true; |
| 2753 | } |
| 2754 | |
| 2755 | return false; |
| 2756 | } |
| 2757 | |
| 2758 | /// Checks the validity of a template parameter list, possibly |
| 2759 | /// considering the template parameter list from a previous |
| 2760 | /// declaration. |
| 2761 | /// |
| 2762 | /// If an "old" template parameter list is provided, it must be |
| 2763 | /// equivalent (per TemplateParameterListsAreEqual) to the "new" |
| 2764 | /// template parameter list. |
| 2765 | /// |
| 2766 | /// \param NewParams Template parameter list for a new template |
| 2767 | /// declaration. This template parameter list will be updated with any |
| 2768 | /// default arguments that are carried through from the previous |
| 2769 | /// template parameter list. |
| 2770 | /// |
| 2771 | /// \param OldParams If provided, template parameter list from a |
| 2772 | /// previous declaration of the same template. Default template |
| 2773 | /// arguments will be merged from the old template parameter list to |
| 2774 | /// the new template parameter list. |
| 2775 | /// |
| 2776 | /// \param TPC Describes the context in which we are checking the given |
| 2777 | /// template parameter list. |
| 2778 | /// |
| 2779 | /// \param SkipBody If we might have already made a prior merged definition |
| 2780 | /// of this template visible, the corresponding body-skipping information. |
| 2781 | /// Default argument redefinition is not an error when skipping such a body, |
| 2782 | /// because (under the ODR) we can assume the default arguments are the same |
| 2783 | /// as the prior merged definition. |
| 2784 | /// |
| 2785 | /// \returns true if an error occurred, false otherwise. |
| 2786 | bool Sema::CheckTemplateParameterList(TemplateParameterList *NewParams, |
| 2787 | TemplateParameterList *OldParams, |
| 2788 | TemplateParamListContext TPC, |
| 2789 | SkipBodyInfo *SkipBody) { |
| 2790 | bool Invalid = false; |
| 2791 | |
| 2792 | // C++ [temp.param]p10: |
| 2793 | // The set of default template-arguments available for use with a |
| 2794 | // template declaration or definition is obtained by merging the |
| 2795 | // default arguments from the definition (if in scope) and all |
| 2796 | // declarations in scope in the same way default function |
| 2797 | // arguments are (8.3.6). |
| 2798 | bool SawDefaultArgument = false; |
| 2799 | SourceLocation PreviousDefaultArgLoc; |
| 2800 | |
| 2801 | // Dummy initialization to avoid warnings. |
| 2802 | TemplateParameterList::iterator OldParam = NewParams->end(); |
| 2803 | if (OldParams) |
| 2804 | OldParam = OldParams->begin(); |
| 2805 | |
| 2806 | bool RemoveDefaultArguments = false; |
| 2807 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
| 2808 | NewParamEnd = NewParams->end(); |
| 2809 | NewParam != NewParamEnd; ++NewParam) { |
| 2810 | // Whether we've seen a duplicate default argument in the same translation |
| 2811 | // unit. |
| 2812 | bool RedundantDefaultArg = false; |
| 2813 | // Whether we've found inconsis inconsitent default arguments in different |
| 2814 | // translation unit. |
| 2815 | bool InconsistentDefaultArg = false; |
| 2816 | // The name of the module which contains the inconsistent default argument. |
| 2817 | std::string PrevModuleName; |
| 2818 | |
| 2819 | SourceLocation OldDefaultLoc; |
| 2820 | SourceLocation NewDefaultLoc; |
| 2821 | |
| 2822 | // Variable used to diagnose missing default arguments |
| 2823 | bool MissingDefaultArg = false; |
| 2824 | |
| 2825 | // Variable used to diagnose non-final parameter packs |
| 2826 | bool SawParameterPack = false; |
| 2827 | |
| 2828 | if (TemplateTypeParmDecl *NewTypeParm |
| 2829 | = dyn_cast<TemplateTypeParmDecl>(*NewParam)) { |
| 2830 | // Check the presence of a default argument here. |
| 2831 | if (NewTypeParm->hasDefaultArgument() && |
| 2832 | DiagnoseDefaultTemplateArgument(*this, TPC, |
| 2833 | NewTypeParm->getLocation(), |
| 2834 | NewTypeParm->getDefaultArgumentInfo()->getTypeLoc() |
| 2835 | .getSourceRange())) |
| 2836 | NewTypeParm->removeDefaultArgument(); |
| 2837 | |
| 2838 | // Merge default arguments for template type parameters. |
| 2839 | TemplateTypeParmDecl *OldTypeParm |
| 2840 | = OldParams? cast<TemplateTypeParmDecl>(*OldParam) : nullptr; |
| 2841 | if (NewTypeParm->isParameterPack()) { |
| 2842 | assert(!NewTypeParm->hasDefaultArgument() &&(static_cast <bool> (!NewTypeParm->hasDefaultArgument () && "Parameter packs can't have a default argument!" ) ? void (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2843, __extension__ __PRETTY_FUNCTION__ )) |
| 2843 | "Parameter packs can't have a default argument!")(static_cast <bool> (!NewTypeParm->hasDefaultArgument () && "Parameter packs can't have a default argument!" ) ? void (0) : __assert_fail ("!NewTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2843, __extension__ __PRETTY_FUNCTION__ )); |
| 2844 | SawParameterPack = true; |
| 2845 | } else if (OldTypeParm && hasVisibleDefaultArgument(OldTypeParm) && |
| 2846 | NewTypeParm->hasDefaultArgument() && |
| 2847 | (!SkipBody || !SkipBody->ShouldSkip)) { |
| 2848 | OldDefaultLoc = OldTypeParm->getDefaultArgumentLoc(); |
| 2849 | NewDefaultLoc = NewTypeParm->getDefaultArgumentLoc(); |
| 2850 | SawDefaultArgument = true; |
| 2851 | |
| 2852 | if (!OldTypeParm->getOwningModule() || |
| 2853 | isModuleUnitOfCurrentTU(OldTypeParm->getOwningModule())) |
| 2854 | RedundantDefaultArg = true; |
| 2855 | else if (!getASTContext().isSameDefaultTemplateArgument(OldTypeParm, |
| 2856 | NewTypeParm)) { |
| 2857 | InconsistentDefaultArg = true; |
| 2858 | PrevModuleName = |
| 2859 | OldTypeParm->getImportedOwningModule()->getFullModuleName(); |
| 2860 | } |
| 2861 | PreviousDefaultArgLoc = NewDefaultLoc; |
| 2862 | } else if (OldTypeParm && OldTypeParm->hasDefaultArgument()) { |
| 2863 | // Merge the default argument from the old declaration to the |
| 2864 | // new declaration. |
| 2865 | NewTypeParm->setInheritedDefaultArgument(Context, OldTypeParm); |
| 2866 | PreviousDefaultArgLoc = OldTypeParm->getDefaultArgumentLoc(); |
| 2867 | } else if (NewTypeParm->hasDefaultArgument()) { |
| 2868 | SawDefaultArgument = true; |
| 2869 | PreviousDefaultArgLoc = NewTypeParm->getDefaultArgumentLoc(); |
| 2870 | } else if (SawDefaultArgument) |
| 2871 | MissingDefaultArg = true; |
| 2872 | } else if (NonTypeTemplateParmDecl *NewNonTypeParm |
| 2873 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) { |
| 2874 | // Check for unexpanded parameter packs. |
| 2875 | if (!NewNonTypeParm->isParameterPack() && |
| 2876 | DiagnoseUnexpandedParameterPack(NewNonTypeParm->getLocation(), |
| 2877 | NewNonTypeParm->getTypeSourceInfo(), |
| 2878 | UPPC_NonTypeTemplateParameterType)) { |
| 2879 | Invalid = true; |
| 2880 | continue; |
| 2881 | } |
| 2882 | |
| 2883 | // Check the presence of a default argument here. |
| 2884 | if (NewNonTypeParm->hasDefaultArgument() && |
| 2885 | DiagnoseDefaultTemplateArgument(*this, TPC, |
| 2886 | NewNonTypeParm->getLocation(), |
| 2887 | NewNonTypeParm->getDefaultArgument()->getSourceRange())) { |
| 2888 | NewNonTypeParm->removeDefaultArgument(); |
| 2889 | } |
| 2890 | |
| 2891 | // Merge default arguments for non-type template parameters |
| 2892 | NonTypeTemplateParmDecl *OldNonTypeParm |
| 2893 | = OldParams? cast<NonTypeTemplateParmDecl>(*OldParam) : nullptr; |
| 2894 | if (NewNonTypeParm->isParameterPack()) { |
| 2895 | assert(!NewNonTypeParm->hasDefaultArgument() &&(static_cast <bool> (!NewNonTypeParm->hasDefaultArgument () && "Parameter packs can't have a default argument!" ) ? void (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2896, __extension__ __PRETTY_FUNCTION__ )) |
| 2896 | "Parameter packs can't have a default argument!")(static_cast <bool> (!NewNonTypeParm->hasDefaultArgument () && "Parameter packs can't have a default argument!" ) ? void (0) : __assert_fail ("!NewNonTypeParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2896, __extension__ __PRETTY_FUNCTION__ )); |
| 2897 | if (!NewNonTypeParm->isPackExpansion()) |
| 2898 | SawParameterPack = true; |
| 2899 | } else if (OldNonTypeParm && hasVisibleDefaultArgument(OldNonTypeParm) && |
| 2900 | NewNonTypeParm->hasDefaultArgument() && |
| 2901 | (!SkipBody || !SkipBody->ShouldSkip)) { |
| 2902 | OldDefaultLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
| 2903 | NewDefaultLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
| 2904 | SawDefaultArgument = true; |
| 2905 | if (!OldNonTypeParm->getOwningModule() || |
| 2906 | isModuleUnitOfCurrentTU(OldNonTypeParm->getOwningModule())) |
| 2907 | RedundantDefaultArg = true; |
| 2908 | else if (!getASTContext().isSameDefaultTemplateArgument( |
| 2909 | OldNonTypeParm, NewNonTypeParm)) { |
| 2910 | InconsistentDefaultArg = true; |
| 2911 | PrevModuleName = |
| 2912 | OldNonTypeParm->getImportedOwningModule()->getFullModuleName(); |
| 2913 | } |
| 2914 | PreviousDefaultArgLoc = NewDefaultLoc; |
| 2915 | } else if (OldNonTypeParm && OldNonTypeParm->hasDefaultArgument()) { |
| 2916 | // Merge the default argument from the old declaration to the |
| 2917 | // new declaration. |
| 2918 | NewNonTypeParm->setInheritedDefaultArgument(Context, OldNonTypeParm); |
| 2919 | PreviousDefaultArgLoc = OldNonTypeParm->getDefaultArgumentLoc(); |
| 2920 | } else if (NewNonTypeParm->hasDefaultArgument()) { |
| 2921 | SawDefaultArgument = true; |
| 2922 | PreviousDefaultArgLoc = NewNonTypeParm->getDefaultArgumentLoc(); |
| 2923 | } else if (SawDefaultArgument) |
| 2924 | MissingDefaultArg = true; |
| 2925 | } else { |
| 2926 | TemplateTemplateParmDecl *NewTemplateParm |
| 2927 | = cast<TemplateTemplateParmDecl>(*NewParam); |
| 2928 | |
| 2929 | // Check for unexpanded parameter packs, recursively. |
| 2930 | if (::DiagnoseUnexpandedParameterPacks(*this, NewTemplateParm)) { |
| 2931 | Invalid = true; |
| 2932 | continue; |
| 2933 | } |
| 2934 | |
| 2935 | // Check the presence of a default argument here. |
| 2936 | if (NewTemplateParm->hasDefaultArgument() && |
| 2937 | DiagnoseDefaultTemplateArgument(*this, TPC, |
| 2938 | NewTemplateParm->getLocation(), |
| 2939 | NewTemplateParm->getDefaultArgument().getSourceRange())) |
| 2940 | NewTemplateParm->removeDefaultArgument(); |
| 2941 | |
| 2942 | // Merge default arguments for template template parameters |
| 2943 | TemplateTemplateParmDecl *OldTemplateParm |
| 2944 | = OldParams? cast<TemplateTemplateParmDecl>(*OldParam) : nullptr; |
| 2945 | if (NewTemplateParm->isParameterPack()) { |
| 2946 | assert(!NewTemplateParm->hasDefaultArgument() &&(static_cast <bool> (!NewTemplateParm->hasDefaultArgument () && "Parameter packs can't have a default argument!" ) ? void (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2947, __extension__ __PRETTY_FUNCTION__ )) |
| 2947 | "Parameter packs can't have a default argument!")(static_cast <bool> (!NewTemplateParm->hasDefaultArgument () && "Parameter packs can't have a default argument!" ) ? void (0) : __assert_fail ("!NewTemplateParm->hasDefaultArgument() && \"Parameter packs can't have a default argument!\"" , "clang/lib/Sema/SemaTemplate.cpp", 2947, __extension__ __PRETTY_FUNCTION__ )); |
| 2948 | if (!NewTemplateParm->isPackExpansion()) |
| 2949 | SawParameterPack = true; |
| 2950 | } else if (OldTemplateParm && |
| 2951 | hasVisibleDefaultArgument(OldTemplateParm) && |
| 2952 | NewTemplateParm->hasDefaultArgument() && |
| 2953 | (!SkipBody || !SkipBody->ShouldSkip)) { |
| 2954 | OldDefaultLoc = OldTemplateParm->getDefaultArgument().getLocation(); |
| 2955 | NewDefaultLoc = NewTemplateParm->getDefaultArgument().getLocation(); |
| 2956 | SawDefaultArgument = true; |
| 2957 | if (!OldTemplateParm->getOwningModule() || |
| 2958 | isModuleUnitOfCurrentTU(OldTemplateParm->getOwningModule())) |
| 2959 | RedundantDefaultArg = true; |
| 2960 | else if (!getASTContext().isSameDefaultTemplateArgument( |
| 2961 | OldTemplateParm, NewTemplateParm)) { |
| 2962 | InconsistentDefaultArg = true; |
| 2963 | PrevModuleName = |
| 2964 | OldTemplateParm->getImportedOwningModule()->getFullModuleName(); |
| 2965 | } |
| 2966 | PreviousDefaultArgLoc = NewDefaultLoc; |
| 2967 | } else if (OldTemplateParm && OldTemplateParm->hasDefaultArgument()) { |
| 2968 | // Merge the default argument from the old declaration to the |
| 2969 | // new declaration. |
| 2970 | NewTemplateParm->setInheritedDefaultArgument(Context, OldTemplateParm); |
| 2971 | PreviousDefaultArgLoc |
| 2972 | = OldTemplateParm->getDefaultArgument().getLocation(); |
| 2973 | } else if (NewTemplateParm->hasDefaultArgument()) { |
| 2974 | SawDefaultArgument = true; |
| 2975 | PreviousDefaultArgLoc |
| 2976 | = NewTemplateParm->getDefaultArgument().getLocation(); |
| 2977 | } else if (SawDefaultArgument) |
| 2978 | MissingDefaultArg = true; |
| 2979 | } |
| 2980 | |
| 2981 | // C++11 [temp.param]p11: |
| 2982 | // If a template parameter of a primary class template or alias template |
| 2983 | // is a template parameter pack, it shall be the last template parameter. |
| 2984 | if (SawParameterPack && (NewParam + 1) != NewParamEnd && |
| 2985 | (TPC == TPC_ClassTemplate || TPC == TPC_VarTemplate || |
| 2986 | TPC == TPC_TypeAliasTemplate)) { |
| 2987 | Diag((*NewParam)->getLocation(), |
| 2988 | diag::err_template_param_pack_must_be_last_template_parameter); |
| 2989 | Invalid = true; |
| 2990 | } |
| 2991 | |
| 2992 | // [basic.def.odr]/13: |
| 2993 | // There can be more than one definition of a |
| 2994 | // ... |
| 2995 | // default template argument |
| 2996 | // ... |
| 2997 | // in a program provided that each definition appears in a different |
| 2998 | // translation unit and the definitions satisfy the [same-meaning |
| 2999 | // criteria of the ODR]. |
| 3000 | // |
| 3001 | // Simply, the design of modules allows the definition of template default |
| 3002 | // argument to be repeated across translation unit. Note that the ODR is |
| 3003 | // checked elsewhere. But it is still not allowed to repeat template default |
| 3004 | // argument in the same translation unit. |
| 3005 | if (RedundantDefaultArg) { |
| 3006 | Diag(NewDefaultLoc, diag::err_template_param_default_arg_redefinition); |
| 3007 | Diag(OldDefaultLoc, diag::note_template_param_prev_default_arg); |
| 3008 | Invalid = true; |
| 3009 | } else if (InconsistentDefaultArg) { |
| 3010 | // We could only diagnose about the case that the OldParam is imported. |
| 3011 | // The case NewParam is imported should be handled in ASTReader. |
| 3012 | Diag(NewDefaultLoc, |
| 3013 | diag::err_template_param_default_arg_inconsistent_redefinition); |
| 3014 | Diag(OldDefaultLoc, |
| 3015 | diag::note_template_param_prev_default_arg_in_other_module) |
| 3016 | << PrevModuleName; |
| 3017 | Invalid = true; |
| 3018 | } else if (MissingDefaultArg && TPC != TPC_FunctionTemplate) { |
| 3019 | // C++ [temp.param]p11: |
| 3020 | // If a template-parameter of a class template has a default |
| 3021 | // template-argument, each subsequent template-parameter shall either |
| 3022 | // have a default template-argument supplied or be a template parameter |
| 3023 | // pack. |
| 3024 | Diag((*NewParam)->getLocation(), |
| 3025 | diag::err_template_param_default_arg_missing); |
| 3026 | Diag(PreviousDefaultArgLoc, diag::note_template_param_prev_default_arg); |
| 3027 | Invalid = true; |
| 3028 | RemoveDefaultArguments = true; |
| 3029 | } |
| 3030 | |
| 3031 | // If we have an old template parameter list that we're merging |
| 3032 | // in, move on to the next parameter. |
| 3033 | if (OldParams) |
| 3034 | ++OldParam; |
| 3035 | } |
| 3036 | |
| 3037 | // We were missing some default arguments at the end of the list, so remove |
| 3038 | // all of the default arguments. |
| 3039 | if (RemoveDefaultArguments) { |
| 3040 | for (TemplateParameterList::iterator NewParam = NewParams->begin(), |
| 3041 | NewParamEnd = NewParams->end(); |
| 3042 | NewParam != NewParamEnd; ++NewParam) { |
| 3043 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(*NewParam)) |
| 3044 | TTP->removeDefaultArgument(); |
| 3045 | else if (NonTypeTemplateParmDecl *NTTP |
| 3046 | = dyn_cast<NonTypeTemplateParmDecl>(*NewParam)) |
| 3047 | NTTP->removeDefaultArgument(); |
| 3048 | else |
| 3049 | cast<TemplateTemplateParmDecl>(*NewParam)->removeDefaultArgument(); |
| 3050 | } |
| 3051 | } |
| 3052 | |
| 3053 | return Invalid; |
| 3054 | } |
| 3055 | |
| 3056 | namespace { |
| 3057 | |
| 3058 | /// A class which looks for a use of a certain level of template |
| 3059 | /// parameter. |
| 3060 | struct DependencyChecker : RecursiveASTVisitor<DependencyChecker> { |
| 3061 | typedef RecursiveASTVisitor<DependencyChecker> super; |
| 3062 | |
| 3063 | unsigned Depth; |
| 3064 | |
| 3065 | // Whether we're looking for a use of a template parameter that makes the |
| 3066 | // overall construct type-dependent / a dependent type. This is strictly |
| 3067 | // best-effort for now; we may fail to match at all for a dependent type |
| 3068 | // in some cases if this is set. |
| 3069 | bool IgnoreNonTypeDependent; |
| 3070 | |
| 3071 | bool Match; |
| 3072 | SourceLocation MatchLoc; |
| 3073 | |
| 3074 | DependencyChecker(unsigned Depth, bool IgnoreNonTypeDependent) |
| 3075 | : Depth(Depth), IgnoreNonTypeDependent(IgnoreNonTypeDependent), |
| 3076 | Match(false) {} |
| 3077 | |
| 3078 | DependencyChecker(TemplateParameterList *Params, bool IgnoreNonTypeDependent) |
| 3079 | : IgnoreNonTypeDependent(IgnoreNonTypeDependent), Match(false) { |
| 3080 | NamedDecl *ND = Params->getParam(0); |
| 3081 | if (TemplateTypeParmDecl *PD = dyn_cast<TemplateTypeParmDecl>(ND)) { |
| 3082 | Depth = PD->getDepth(); |
| 3083 | } else if (NonTypeTemplateParmDecl *PD = |
| 3084 | dyn_cast<NonTypeTemplateParmDecl>(ND)) { |
| 3085 | Depth = PD->getDepth(); |
| 3086 | } else { |
| 3087 | Depth = cast<TemplateTemplateParmDecl>(ND)->getDepth(); |
| 3088 | } |
| 3089 | } |
| 3090 | |
| 3091 | bool Matches(unsigned ParmDepth, SourceLocation Loc = SourceLocation()) { |
| 3092 | if (ParmDepth >= Depth) { |
| 3093 | Match = true; |
| 3094 | MatchLoc = Loc; |
| 3095 | return true; |
| 3096 | } |
| 3097 | return false; |
| 3098 | } |
| 3099 | |
| 3100 | bool TraverseStmt(Stmt *S, DataRecursionQueue *Q = nullptr) { |
| 3101 | // Prune out non-type-dependent expressions if requested. This can |
| 3102 | // sometimes result in us failing to find a template parameter reference |
| 3103 | // (if a value-dependent expression creates a dependent type), but this |
| 3104 | // mode is best-effort only. |
| 3105 | if (auto *E = dyn_cast_or_null<Expr>(S)) |
| 3106 | if (IgnoreNonTypeDependent && !E->isTypeDependent()) |
| 3107 | return true; |
| 3108 | return super::TraverseStmt(S, Q); |
| 3109 | } |
| 3110 | |
| 3111 | bool TraverseTypeLoc(TypeLoc TL) { |
| 3112 | if (IgnoreNonTypeDependent && !TL.isNull() && |
| 3113 | !TL.getType()->isDependentType()) |
| 3114 | return true; |
| 3115 | return super::TraverseTypeLoc(TL); |
| 3116 | } |
| 3117 | |
| 3118 | bool VisitTemplateTypeParmTypeLoc(TemplateTypeParmTypeLoc TL) { |
| 3119 | return !Matches(TL.getTypePtr()->getDepth(), TL.getNameLoc()); |
| 3120 | } |
| 3121 | |
| 3122 | bool VisitTemplateTypeParmType(const TemplateTypeParmType *T) { |
| 3123 | // For a best-effort search, keep looking until we find a location. |
| 3124 | return IgnoreNonTypeDependent || !Matches(T->getDepth()); |
| 3125 | } |
| 3126 | |
| 3127 | bool TraverseTemplateName(TemplateName N) { |
| 3128 | if (TemplateTemplateParmDecl *PD = |
| 3129 | dyn_cast_or_null<TemplateTemplateParmDecl>(N.getAsTemplateDecl())) |
| 3130 | if (Matches(PD->getDepth())) |
| 3131 | return false; |
| 3132 | return super::TraverseTemplateName(N); |
| 3133 | } |
| 3134 | |
| 3135 | bool VisitDeclRefExpr(DeclRefExpr *E) { |
| 3136 | if (NonTypeTemplateParmDecl *PD = |
| 3137 | dyn_cast<NonTypeTemplateParmDecl>(E->getDecl())) |
| 3138 | if (Matches(PD->getDepth(), E->getExprLoc())) |
| 3139 | return false; |
| 3140 | return super::VisitDeclRefExpr(E); |
| 3141 | } |
| 3142 | |
| 3143 | bool VisitSubstTemplateTypeParmType(const SubstTemplateTypeParmType *T) { |
| 3144 | return TraverseType(T->getReplacementType()); |
| 3145 | } |
| 3146 | |
| 3147 | bool |
| 3148 | VisitSubstTemplateTypeParmPackType(const SubstTemplateTypeParmPackType *T) { |
| 3149 | return TraverseTemplateArgument(T->getArgumentPack()); |
| 3150 | } |
| 3151 | |
| 3152 | bool TraverseInjectedClassNameType(const InjectedClassNameType *T) { |
| 3153 | return TraverseType(T->getInjectedSpecializationType()); |
| 3154 | } |
| 3155 | }; |
| 3156 | } // end anonymous namespace |
| 3157 | |
| 3158 | /// Determines whether a given type depends on the given parameter |
| 3159 | /// list. |
| 3160 | static bool |
| 3161 | DependsOnTemplateParameters(QualType T, TemplateParameterList *Params) { |
| 3162 | if (!Params->size()) |
| 3163 | return false; |
| 3164 | |
| 3165 | DependencyChecker Checker(Params, /*IgnoreNonTypeDependent*/false); |
| 3166 | Checker.TraverseType(T); |
| 3167 | return Checker.Match; |
| 3168 | } |
| 3169 | |
| 3170 | // Find the source range corresponding to the named type in the given |
| 3171 | // nested-name-specifier, if any. |
| 3172 | static SourceRange getRangeOfTypeInNestedNameSpecifier(ASTContext &Context, |
| 3173 | QualType T, |
| 3174 | const CXXScopeSpec &SS) { |
| 3175 | NestedNameSpecifierLoc NNSLoc(SS.getScopeRep(), SS.location_data()); |
| 3176 | while (NestedNameSpecifier *NNS = NNSLoc.getNestedNameSpecifier()) { |
| 3177 | if (const Type *CurType = NNS->getAsType()) { |
| 3178 | if (Context.hasSameUnqualifiedType(T, QualType(CurType, 0))) |
| 3179 | return NNSLoc.getTypeLoc().getSourceRange(); |
| 3180 | } else |
| 3181 | break; |
| 3182 | |
| 3183 | NNSLoc = NNSLoc.getPrefix(); |
| 3184 | } |
| 3185 | |
| 3186 | return SourceRange(); |
| 3187 | } |
| 3188 | |
| 3189 | /// Match the given template parameter lists to the given scope |
| 3190 | /// specifier, returning the template parameter list that applies to the |
| 3191 | /// name. |
| 3192 | /// |
| 3193 | /// \param DeclStartLoc the start of the declaration that has a scope |
| 3194 | /// specifier or a template parameter list. |
| 3195 | /// |
| 3196 | /// \param DeclLoc The location of the declaration itself. |
| 3197 | /// |
| 3198 | /// \param SS the scope specifier that will be matched to the given template |
| 3199 | /// parameter lists. This scope specifier precedes a qualified name that is |
| 3200 | /// being declared. |
| 3201 | /// |
| 3202 | /// \param TemplateId The template-id following the scope specifier, if there |
| 3203 | /// is one. Used to check for a missing 'template<>'. |
| 3204 | /// |
| 3205 | /// \param ParamLists the template parameter lists, from the outermost to the |
| 3206 | /// innermost template parameter lists. |
| 3207 | /// |
| 3208 | /// \param IsFriend Whether to apply the slightly different rules for |
| 3209 | /// matching template parameters to scope specifiers in friend |
| 3210 | /// declarations. |
| 3211 | /// |
| 3212 | /// \param IsMemberSpecialization will be set true if the scope specifier |
| 3213 | /// denotes a fully-specialized type, and therefore this is a declaration of |
| 3214 | /// a member specialization. |
| 3215 | /// |
| 3216 | /// \returns the template parameter list, if any, that corresponds to the |
| 3217 | /// name that is preceded by the scope specifier @p SS. This template |
| 3218 | /// parameter list may have template parameters (if we're declaring a |
| 3219 | /// template) or may have no template parameters (if we're declaring a |
| 3220 | /// template specialization), or may be NULL (if what we're declaring isn't |
| 3221 | /// itself a template). |
| 3222 | TemplateParameterList *Sema::MatchTemplateParametersToScopeSpecifier( |
| 3223 | SourceLocation DeclStartLoc, SourceLocation DeclLoc, const CXXScopeSpec &SS, |
| 3224 | TemplateIdAnnotation *TemplateId, |
| 3225 | ArrayRef<TemplateParameterList *> ParamLists, bool IsFriend, |
| 3226 | bool &IsMemberSpecialization, bool &Invalid, bool SuppressDiagnostic) { |
| 3227 | IsMemberSpecialization = false; |
| 3228 | Invalid = false; |
| 3229 | |
| 3230 | // The sequence of nested types to which we will match up the template |
| 3231 | // parameter lists. We first build this list by starting with the type named |
| 3232 | // by the nested-name-specifier and walking out until we run out of types. |
| 3233 | SmallVector<QualType, 4> NestedTypes; |
| 3234 | QualType T; |
| 3235 | if (SS.getScopeRep()) { |
| 3236 | if (CXXRecordDecl *Record |
| 3237 | = dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS, true))) |
| 3238 | T = Context.getTypeDeclType(Record); |
| 3239 | else |
| 3240 | T = QualType(SS.getScopeRep()->getAsType(), 0); |
| 3241 | } |
| 3242 | |
| 3243 | // If we found an explicit specialization that prevents us from needing |
| 3244 | // 'template<>' headers, this will be set to the location of that |
| 3245 | // explicit specialization. |
| 3246 | SourceLocation ExplicitSpecLoc; |
| 3247 | |
| 3248 | while (!T.isNull()) { |
| 3249 | NestedTypes.push_back(T); |
| 3250 | |
| 3251 | // Retrieve the parent of a record type. |
| 3252 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
| 3253 | // If this type is an explicit specialization, we're done. |
| 3254 | if (ClassTemplateSpecializationDecl *Spec |
| 3255 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
| 3256 | if (!isa<ClassTemplatePartialSpecializationDecl>(Spec) && |
| 3257 | Spec->getSpecializationKind() == TSK_ExplicitSpecialization) { |
| 3258 | ExplicitSpecLoc = Spec->getLocation(); |
| 3259 | break; |
| 3260 | } |
| 3261 | } else if (Record->getTemplateSpecializationKind() |
| 3262 | == TSK_ExplicitSpecialization) { |
| 3263 | ExplicitSpecLoc = Record->getLocation(); |
| 3264 | break; |
| 3265 | } |
| 3266 | |
| 3267 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Record->getParent())) |
| 3268 | T = Context.getTypeDeclType(Parent); |
| 3269 | else |
| 3270 | T = QualType(); |
| 3271 | continue; |
| 3272 | } |
| 3273 | |
| 3274 | if (const TemplateSpecializationType *TST |
| 3275 | = T->getAs<TemplateSpecializationType>()) { |
| 3276 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
| 3277 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Template->getDeclContext())) |
| 3278 | T = Context.getTypeDeclType(Parent); |
| 3279 | else |
| 3280 | T = QualType(); |
| 3281 | continue; |
| 3282 | } |
| 3283 | } |
| 3284 | |
| 3285 | // Look one step prior in a dependent template specialization type. |
| 3286 | if (const DependentTemplateSpecializationType *DependentTST |
| 3287 | = T->getAs<DependentTemplateSpecializationType>()) { |
| 3288 | if (NestedNameSpecifier *NNS = DependentTST->getQualifier()) |
| 3289 | T = QualType(NNS->getAsType(), 0); |
| 3290 | else |
| 3291 | T = QualType(); |
| 3292 | continue; |
| 3293 | } |
| 3294 | |
| 3295 | // Look one step prior in a dependent name type. |
| 3296 | if (const DependentNameType *DependentName = T->getAs<DependentNameType>()){ |
| 3297 | if (NestedNameSpecifier *NNS = DependentName->getQualifier()) |
| 3298 | T = QualType(NNS->getAsType(), 0); |
| 3299 | else |
| 3300 | T = QualType(); |
| 3301 | continue; |
| 3302 | } |
| 3303 | |
| 3304 | // Retrieve the parent of an enumeration type. |
| 3305 | if (const EnumType *EnumT = T->getAs<EnumType>()) { |
| 3306 | // FIXME: Forward-declared enums require a TSK_ExplicitSpecialization |
| 3307 | // check here. |
| 3308 | EnumDecl *Enum = EnumT->getDecl(); |
| 3309 | |
| 3310 | // Get to the parent type. |
| 3311 | if (TypeDecl *Parent = dyn_cast<TypeDecl>(Enum->getParent())) |
| 3312 | T = Context.getTypeDeclType(Parent); |
| 3313 | else |
| 3314 | T = QualType(); |
| 3315 | continue; |
| 3316 | } |
| 3317 | |
| 3318 | T = QualType(); |
| 3319 | } |
| 3320 | // Reverse the nested types list, since we want to traverse from the outermost |
| 3321 | // to the innermost while checking template-parameter-lists. |
| 3322 | std::reverse(NestedTypes.begin(), NestedTypes.end()); |
| 3323 | |
| 3324 | // C++0x [temp.expl.spec]p17: |
| 3325 | // A member or a member template may be nested within many |
| 3326 | // enclosing class templates. In an explicit specialization for |
| 3327 | // such a member, the member declaration shall be preceded by a |
| 3328 | // template<> for each enclosing class template that is |
| 3329 | // explicitly specialized. |
| 3330 | bool SawNonEmptyTemplateParameterList = false; |
| 3331 | |
| 3332 | auto CheckExplicitSpecialization = [&](SourceRange Range, bool Recovery) { |
| 3333 | if (SawNonEmptyTemplateParameterList) { |
| 3334 | if (!SuppressDiagnostic) |
| 3335 | Diag(DeclLoc, diag::err_specialize_member_of_template) |
| 3336 | << !Recovery << Range; |
| 3337 | Invalid = true; |
| 3338 | IsMemberSpecialization = false; |
| 3339 | return true; |
| 3340 | } |
| 3341 | |
| 3342 | return false; |
| 3343 | }; |
| 3344 | |
| 3345 | auto DiagnoseMissingExplicitSpecialization = [&] (SourceRange Range) { |
| 3346 | // Check that we can have an explicit specialization here. |
| 3347 | if (CheckExplicitSpecialization(Range, true)) |
| 3348 | return true; |
| 3349 | |
| 3350 | // We don't have a template header, but we should. |
| 3351 | SourceLocation ExpectedTemplateLoc; |
| 3352 | if (!ParamLists.empty()) |
| 3353 | ExpectedTemplateLoc = ParamLists[0]->getTemplateLoc(); |
| 3354 | else |
| 3355 | ExpectedTemplateLoc = DeclStartLoc; |
| 3356 | |
| 3357 | if (!SuppressDiagnostic) |
| 3358 | Diag(DeclLoc, diag::err_template_spec_needs_header) |
| 3359 | << Range |
| 3360 | << FixItHint::CreateInsertion(ExpectedTemplateLoc, "template<> "); |
| 3361 | return false; |
| 3362 | }; |
| 3363 | |
| 3364 | unsigned ParamIdx = 0; |
| 3365 | for (unsigned TypeIdx = 0, NumTypes = NestedTypes.size(); TypeIdx != NumTypes; |
| 3366 | ++TypeIdx) { |
| 3367 | T = NestedTypes[TypeIdx]; |
| 3368 | |
| 3369 | // Whether we expect a 'template<>' header. |
| 3370 | bool NeedEmptyTemplateHeader = false; |
| 3371 | |
| 3372 | // Whether we expect a template header with parameters. |
| 3373 | bool NeedNonemptyTemplateHeader = false; |
| 3374 | |
| 3375 | // For a dependent type, the set of template parameters that we |
| 3376 | // expect to see. |
| 3377 | TemplateParameterList *ExpectedTemplateParams = nullptr; |
| 3378 | |
| 3379 | // C++0x [temp.expl.spec]p15: |
| 3380 | // A member or a member template may be nested within many enclosing |
| 3381 | // class templates. In an explicit specialization for such a member, the |
| 3382 | // member declaration shall be preceded by a template<> for each |
| 3383 | // enclosing class template that is explicitly specialized. |
| 3384 | if (CXXRecordDecl *Record = T->getAsCXXRecordDecl()) { |
| 3385 | if (ClassTemplatePartialSpecializationDecl *Partial |
| 3386 | = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record)) { |
| 3387 | ExpectedTemplateParams = Partial->getTemplateParameters(); |
| 3388 | NeedNonemptyTemplateHeader = true; |
| 3389 | } else if (Record->isDependentType()) { |
| 3390 | if (Record->getDescribedClassTemplate()) { |
| 3391 | ExpectedTemplateParams = Record->getDescribedClassTemplate() |
| 3392 | ->getTemplateParameters(); |
| 3393 | NeedNonemptyTemplateHeader = true; |
| 3394 | } |
| 3395 | } else if (ClassTemplateSpecializationDecl *Spec |
| 3396 | = dyn_cast<ClassTemplateSpecializationDecl>(Record)) { |
| 3397 | // C++0x [temp.expl.spec]p4: |
| 3398 | // Members of an explicitly specialized class template are defined |
| 3399 | // in the same manner as members of normal classes, and not using |
| 3400 | // the template<> syntax. |
| 3401 | if (Spec->getSpecializationKind() != TSK_ExplicitSpecialization) |
| 3402 | NeedEmptyTemplateHeader = true; |
| 3403 | else |
| 3404 | continue; |
| 3405 | } else if (Record->getTemplateSpecializationKind()) { |
| 3406 | if (Record->getTemplateSpecializationKind() |
| 3407 | != TSK_ExplicitSpecialization && |
| 3408 | TypeIdx == NumTypes - 1) |
| 3409 | IsMemberSpecialization = true; |
| 3410 | |
| 3411 | continue; |
| 3412 | } |
| 3413 | } else if (const TemplateSpecializationType *TST |
| 3414 | = T->getAs<TemplateSpecializationType>()) { |
| 3415 | if (TemplateDecl *Template = TST->getTemplateName().getAsTemplateDecl()) { |
| 3416 | ExpectedTemplateParams = Template->getTemplateParameters(); |
| 3417 | NeedNonemptyTemplateHeader = true; |
| 3418 | } |
| 3419 | } else if (T->getAs<DependentTemplateSpecializationType>()) { |
| 3420 | // FIXME: We actually could/should check the template arguments here |
| 3421 | // against the corresponding template parameter list. |
| 3422 | NeedNonemptyTemplateHeader = false; |
| 3423 | } |
| 3424 | |
| 3425 | // C++ [temp.expl.spec]p16: |
| 3426 | // In an explicit specialization declaration for a member of a class |
| 3427 | // template or a member template that ap- pears in namespace scope, the |
| 3428 | // member template and some of its enclosing class templates may remain |
| 3429 | // unspecialized, except that the declaration shall not explicitly |
| 3430 | // specialize a class member template if its en- closing class templates |
| 3431 | // are not explicitly specialized as well. |
| 3432 | if (ParamIdx < ParamLists.size()) { |
| 3433 | if (ParamLists[ParamIdx]->size() == 0) { |
| 3434 | if (CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), |
| 3435 | false)) |
| 3436 | return nullptr; |
| 3437 | } else |
| 3438 | SawNonEmptyTemplateParameterList = true; |
| 3439 | } |
| 3440 | |
| 3441 | if (NeedEmptyTemplateHeader) { |
| 3442 | // If we're on the last of the types, and we need a 'template<>' header |
| 3443 | // here, then it's a member specialization. |
| 3444 | if (TypeIdx == NumTypes - 1) |
| 3445 | IsMemberSpecialization = true; |
| 3446 | |
| 3447 | if (ParamIdx < ParamLists.size()) { |
| 3448 | if (ParamLists[ParamIdx]->size() > 0) { |
| 3449 | // The header has template parameters when it shouldn't. Complain. |
| 3450 | if (!SuppressDiagnostic) |
| 3451 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
| 3452 | diag::err_template_param_list_matches_nontemplate) |
| 3453 | << T |
| 3454 | << SourceRange(ParamLists[ParamIdx]->getLAngleLoc(), |
| 3455 | ParamLists[ParamIdx]->getRAngleLoc()) |
| 3456 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
| 3457 | Invalid = true; |
| 3458 | return nullptr; |
| 3459 | } |
| 3460 | |
| 3461 | // Consume this template header. |
| 3462 | ++ParamIdx; |
| 3463 | continue; |
| 3464 | } |
| 3465 | |
| 3466 | if (!IsFriend) |
| 3467 | if (DiagnoseMissingExplicitSpecialization( |
| 3468 | getRangeOfTypeInNestedNameSpecifier(Context, T, SS))) |
| 3469 | return nullptr; |
| 3470 | |
| 3471 | continue; |
| 3472 | } |
| 3473 | |
| 3474 | if (NeedNonemptyTemplateHeader) { |
| 3475 | // In friend declarations we can have template-ids which don't |
| 3476 | // depend on the corresponding template parameter lists. But |
| 3477 | // assume that empty parameter lists are supposed to match this |
| 3478 | // template-id. |
| 3479 | if (IsFriend && T->isDependentType()) { |
| 3480 | if (ParamIdx < ParamLists.size() && |
| 3481 | DependsOnTemplateParameters(T, ParamLists[ParamIdx])) |
| 3482 | ExpectedTemplateParams = nullptr; |
| 3483 | else |
| 3484 | continue; |
| 3485 | } |
| 3486 | |
| 3487 | if (ParamIdx < ParamLists.size()) { |
| 3488 | // Check the template parameter list, if we can. |
| 3489 | if (ExpectedTemplateParams && |
| 3490 | !TemplateParameterListsAreEqual(ParamLists[ParamIdx], |
| 3491 | ExpectedTemplateParams, |
| 3492 | !SuppressDiagnostic, TPL_TemplateMatch)) |
| 3493 | Invalid = true; |
| 3494 | |
| 3495 | if (!Invalid && |
| 3496 | CheckTemplateParameterList(ParamLists[ParamIdx], nullptr, |
| 3497 | TPC_ClassTemplateMember)) |
| 3498 | Invalid = true; |
| 3499 | |
| 3500 | ++ParamIdx; |
| 3501 | continue; |
| 3502 | } |
| 3503 | |
| 3504 | if (!SuppressDiagnostic) |
| 3505 | Diag(DeclLoc, diag::err_template_spec_needs_template_parameters) |
| 3506 | << T |
| 3507 | << getRangeOfTypeInNestedNameSpecifier(Context, T, SS); |
| 3508 | Invalid = true; |
| 3509 | continue; |
| 3510 | } |
| 3511 | } |
| 3512 | |
| 3513 | // If there were at least as many template-ids as there were template |
| 3514 | // parameter lists, then there are no template parameter lists remaining for |
| 3515 | // the declaration itself. |
| 3516 | if (ParamIdx >= ParamLists.size()) { |
| 3517 | if (TemplateId && !IsFriend) { |
| 3518 | // We don't have a template header for the declaration itself, but we |
| 3519 | // should. |
| 3520 | DiagnoseMissingExplicitSpecialization(SourceRange(TemplateId->LAngleLoc, |
| 3521 | TemplateId->RAngleLoc)); |
| 3522 | |
| 3523 | // Fabricate an empty template parameter list for the invented header. |
| 3524 | return TemplateParameterList::Create(Context, SourceLocation(), |
| 3525 | SourceLocation(), std::nullopt, |
| 3526 | SourceLocation(), nullptr); |
| 3527 | } |
| 3528 | |
| 3529 | return nullptr; |
| 3530 | } |
| 3531 | |
| 3532 | // If there were too many template parameter lists, complain about that now. |
| 3533 | if (ParamIdx < ParamLists.size() - 1) { |
| 3534 | bool HasAnyExplicitSpecHeader = false; |
| 3535 | bool AllExplicitSpecHeaders = true; |
| 3536 | for (unsigned I = ParamIdx, E = ParamLists.size() - 1; I != E; ++I) { |
| 3537 | if (ParamLists[I]->size() == 0) |
| 3538 | HasAnyExplicitSpecHeader = true; |
| 3539 | else |
| 3540 | AllExplicitSpecHeaders = false; |
| 3541 | } |
| 3542 | |
| 3543 | if (!SuppressDiagnostic) |
| 3544 | Diag(ParamLists[ParamIdx]->getTemplateLoc(), |
| 3545 | AllExplicitSpecHeaders ? diag::warn_template_spec_extra_headers |
| 3546 | : diag::err_template_spec_extra_headers) |
| 3547 | << SourceRange(ParamLists[ParamIdx]->getTemplateLoc(), |
| 3548 | ParamLists[ParamLists.size() - 2]->getRAngleLoc()); |
| 3549 | |
| 3550 | // If there was a specialization somewhere, such that 'template<>' is |
| 3551 | // not required, and there were any 'template<>' headers, note where the |
| 3552 | // specialization occurred. |
| 3553 | if (ExplicitSpecLoc.isValid() && HasAnyExplicitSpecHeader && |
| 3554 | !SuppressDiagnostic) |
| 3555 | Diag(ExplicitSpecLoc, |
| 3556 | diag::note_explicit_template_spec_does_not_need_header) |
| 3557 | << NestedTypes.back(); |
| 3558 | |
| 3559 | // We have a template parameter list with no corresponding scope, which |
| 3560 | // means that the resulting template declaration can't be instantiated |
| 3561 | // properly (we'll end up with dependent nodes when we shouldn't). |
| 3562 | if (!AllExplicitSpecHeaders) |
| 3563 | Invalid = true; |
| 3564 | } |
| 3565 | |
| 3566 | // C++ [temp.expl.spec]p16: |
| 3567 | // In an explicit specialization declaration for a member of a class |
| 3568 | // template or a member template that ap- pears in namespace scope, the |
| 3569 | // member template and some of its enclosing class templates may remain |
| 3570 | // unspecialized, except that the declaration shall not explicitly |
| 3571 | // specialize a class member template if its en- closing class templates |
| 3572 | // are not explicitly specialized as well. |
| 3573 | if (ParamLists.back()->size() == 0 && |
| 3574 | CheckExplicitSpecialization(ParamLists[ParamIdx]->getSourceRange(), |
| 3575 | false)) |
| 3576 | return nullptr; |
| 3577 | |
| 3578 | // Return the last template parameter list, which corresponds to the |
| 3579 | // entity being declared. |
| 3580 | return ParamLists.back(); |
| 3581 | } |
| 3582 | |
| 3583 | void Sema::NoteAllFoundTemplates(TemplateName Name) { |
| 3584 | if (TemplateDecl *Template = Name.getAsTemplateDecl()) { |
| 3585 | Diag(Template->getLocation(), diag::note_template_declared_here) |
| 3586 | << (isa<FunctionTemplateDecl>(Template) |
| 3587 | ? 0 |
| 3588 | : isa<ClassTemplateDecl>(Template) |
| 3589 | ? 1 |
| 3590 | : isa<VarTemplateDecl>(Template) |
| 3591 | ? 2 |
| 3592 | : isa<TypeAliasTemplateDecl>(Template) ? 3 : 4) |
| 3593 | << Template->getDeclName(); |
| 3594 | return; |
| 3595 | } |
| 3596 | |
| 3597 | if (OverloadedTemplateStorage *OST = Name.getAsOverloadedTemplate()) { |
| 3598 | for (OverloadedTemplateStorage::iterator I = OST->begin(), |
| 3599 | IEnd = OST->end(); |
| 3600 | I != IEnd; ++I) |
| 3601 | Diag((*I)->getLocation(), diag::note_template_declared_here) |
| 3602 | << 0 << (*I)->getDeclName(); |
| 3603 | |
| 3604 | return; |
| 3605 | } |
| 3606 | } |
| 3607 | |
| 3608 | static QualType |
| 3609 | checkBuiltinTemplateIdType(Sema &SemaRef, BuiltinTemplateDecl *BTD, |
| 3610 | ArrayRef<TemplateArgument> Converted, |
| 3611 | SourceLocation TemplateLoc, |
| 3612 | TemplateArgumentListInfo &TemplateArgs) { |
| 3613 | ASTContext &Context = SemaRef.getASTContext(); |
| 3614 | |
| 3615 | switch (BTD->getBuiltinTemplateKind()) { |
| 3616 | case BTK__make_integer_seq: { |
| 3617 | // Specializations of __make_integer_seq<S, T, N> are treated like |
| 3618 | // S<T, 0, ..., N-1>. |
| 3619 | |
| 3620 | QualType OrigType = Converted[1].getAsType(); |
| 3621 | // C++14 [inteseq.intseq]p1: |
| 3622 | // T shall be an integer type. |
| 3623 | if (!OrigType->isDependentType() && !OrigType->isIntegralType(Context)) { |
| 3624 | SemaRef.Diag(TemplateArgs[1].getLocation(), |
| 3625 | diag::err_integer_sequence_integral_element_type); |
| 3626 | return QualType(); |
| 3627 | } |
| 3628 | |
| 3629 | TemplateArgument NumArgsArg = Converted[2]; |
| 3630 | if (NumArgsArg.isDependent()) |
| 3631 | return Context.getCanonicalTemplateSpecializationType(TemplateName(BTD), |
| 3632 | Converted); |
| 3633 | |
| 3634 | TemplateArgumentListInfo SyntheticTemplateArgs; |
| 3635 | // The type argument, wrapped in substitution sugar, gets reused as the |
| 3636 | // first template argument in the synthetic template argument list. |
| 3637 | SyntheticTemplateArgs.addArgument( |
| 3638 | TemplateArgumentLoc(TemplateArgument(OrigType), |
| 3639 | SemaRef.Context.getTrivialTypeSourceInfo( |
| 3640 | OrigType, TemplateArgs[1].getLocation()))); |
| 3641 | |
| 3642 | if (llvm::APSInt NumArgs = NumArgsArg.getAsIntegral(); NumArgs >= 0) { |
| 3643 | // Expand N into 0 ... N-1. |
| 3644 | for (llvm::APSInt I(NumArgs.getBitWidth(), NumArgs.isUnsigned()); |
| 3645 | I < NumArgs; ++I) { |
| 3646 | TemplateArgument TA(Context, I, OrigType); |
| 3647 | SyntheticTemplateArgs.addArgument(SemaRef.getTrivialTemplateArgumentLoc( |
| 3648 | TA, OrigType, TemplateArgs[2].getLocation())); |
| 3649 | } |
| 3650 | } else { |
| 3651 | // C++14 [inteseq.make]p1: |
| 3652 | // If N is negative the program is ill-formed. |
| 3653 | SemaRef.Diag(TemplateArgs[2].getLocation(), |
| 3654 | diag::err_integer_sequence_negative_length); |
| 3655 | return QualType(); |
| 3656 | } |
| 3657 | |
| 3658 | // The first template argument will be reused as the template decl that |
| 3659 | // our synthetic template arguments will be applied to. |
| 3660 | return SemaRef.CheckTemplateIdType(Converted[0].getAsTemplate(), |
| 3661 | TemplateLoc, SyntheticTemplateArgs); |
| 3662 | } |
| 3663 | |
| 3664 | case BTK__type_pack_element: |
| 3665 | // Specializations of |
| 3666 | // __type_pack_element<Index, T_1, ..., T_N> |
| 3667 | // are treated like T_Index. |
| 3668 | assert(Converted.size() == 2 &&(static_cast <bool> (Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack" ) ? void (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\"" , "clang/lib/Sema/SemaTemplate.cpp", 3669, __extension__ __PRETTY_FUNCTION__ )) |
| 3669 | "__type_pack_element should be given an index and a parameter pack")(static_cast <bool> (Converted.size() == 2 && "__type_pack_element should be given an index and a parameter pack" ) ? void (0) : __assert_fail ("Converted.size() == 2 && \"__type_pack_element should be given an index and a parameter pack\"" , "clang/lib/Sema/SemaTemplate.cpp", 3669, __extension__ __PRETTY_FUNCTION__ )); |
| 3670 | |
| 3671 | TemplateArgument IndexArg = Converted[0], Ts = Converted[1]; |
| 3672 | if (IndexArg.isDependent() || Ts.isDependent()) |
| 3673 | return Context.getCanonicalTemplateSpecializationType(TemplateName(BTD), |
| 3674 | Converted); |
| 3675 | |
| 3676 | llvm::APSInt Index = IndexArg.getAsIntegral(); |
| 3677 | assert(Index >= 0 && "the index used with __type_pack_element should be of "(static_cast <bool> (Index >= 0 && "the index used with __type_pack_element should be of " "type std::size_t, and hence be non-negative") ? void (0) : __assert_fail ("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\"" , "clang/lib/Sema/SemaTemplate.cpp", 3678, __extension__ __PRETTY_FUNCTION__ )) |
| 3678 | "type std::size_t, and hence be non-negative")(static_cast <bool> (Index >= 0 && "the index used with __type_pack_element should be of " "type std::size_t, and hence be non-negative") ? void (0) : __assert_fail ("Index >= 0 && \"the index used with __type_pack_element should be of \" \"type std::size_t, and hence be non-negative\"" , "clang/lib/Sema/SemaTemplate.cpp", 3678, __extension__ __PRETTY_FUNCTION__ )); |
| 3679 | // If the Index is out of bounds, the program is ill-formed. |
| 3680 | if (Index >= Ts.pack_size()) { |
| 3681 | SemaRef.Diag(TemplateArgs[0].getLocation(), |
| 3682 | diag::err_type_pack_element_out_of_bounds); |
| 3683 | return QualType(); |
| 3684 | } |
| 3685 | |
| 3686 | // We simply return the type at index `Index`. |
| 3687 | int64_t N = Index.getExtValue(); |
| 3688 | return Ts.getPackAsArray()[N].getAsType(); |
| 3689 | } |
| 3690 | llvm_unreachable("unexpected BuiltinTemplateDecl!")::llvm::llvm_unreachable_internal("unexpected BuiltinTemplateDecl!" , "clang/lib/Sema/SemaTemplate.cpp", 3690); |
| 3691 | } |
| 3692 | |
| 3693 | /// Determine whether this alias template is "enable_if_t". |
| 3694 | /// libc++ >=14 uses "__enable_if_t" in C++11 mode. |
| 3695 | static bool isEnableIfAliasTemplate(TypeAliasTemplateDecl *AliasTemplate) { |
| 3696 | return AliasTemplate->getName().equals("enable_if_t") || |
| 3697 | AliasTemplate->getName().equals("__enable_if_t"); |
| 3698 | } |
| 3699 | |
| 3700 | /// Collect all of the separable terms in the given condition, which |
| 3701 | /// might be a conjunction. |
| 3702 | /// |
| 3703 | /// FIXME: The right answer is to convert the logical expression into |
| 3704 | /// disjunctive normal form, so we can find the first failed term |
| 3705 | /// within each possible clause. |
| 3706 | static void collectConjunctionTerms(Expr *Clause, |
| 3707 | SmallVectorImpl<Expr *> &Terms) { |
| 3708 | if (auto BinOp = dyn_cast<BinaryOperator>(Clause->IgnoreParenImpCasts())) { |
| 3709 | if (BinOp->getOpcode() == BO_LAnd) { |
| 3710 | collectConjunctionTerms(BinOp->getLHS(), Terms); |
| 3711 | collectConjunctionTerms(BinOp->getRHS(), Terms); |
| 3712 | return; |
| 3713 | } |
| 3714 | } |
| 3715 | |
| 3716 | Terms.push_back(Clause); |
| 3717 | } |
| 3718 | |
| 3719 | // The ranges-v3 library uses an odd pattern of a top-level "||" with |
| 3720 | // a left-hand side that is value-dependent but never true. Identify |
| 3721 | // the idiom and ignore that term. |
| 3722 | static Expr *lookThroughRangesV3Condition(Preprocessor &PP, Expr *Cond) { |
| 3723 | // Top-level '||'. |
| 3724 | auto *BinOp = dyn_cast<BinaryOperator>(Cond->IgnoreParenImpCasts()); |
| 3725 | if (!BinOp) return Cond; |
| 3726 | |
| 3727 | if (BinOp->getOpcode() != BO_LOr) return Cond; |
| 3728 | |
| 3729 | // With an inner '==' that has a literal on the right-hand side. |
| 3730 | Expr *LHS = BinOp->getLHS(); |
| 3731 | auto *InnerBinOp = dyn_cast<BinaryOperator>(LHS->IgnoreParenImpCasts()); |
| 3732 | if (!InnerBinOp) return Cond; |
| 3733 | |
| 3734 | if (InnerBinOp->getOpcode() != BO_EQ || |
| 3735 | !isa<IntegerLiteral>(InnerBinOp->getRHS())) |
| 3736 | return Cond; |
| 3737 | |
| 3738 | // If the inner binary operation came from a macro expansion named |
| 3739 | // CONCEPT_REQUIRES or CONCEPT_REQUIRES_, return the right-hand side |
| 3740 | // of the '||', which is the real, user-provided condition. |
| 3741 | SourceLocation Loc = InnerBinOp->getExprLoc(); |
| 3742 | if (!Loc.isMacroID()) return Cond; |
| 3743 | |
| 3744 | StringRef MacroName = PP.getImmediateMacroName(Loc); |
| 3745 | if (MacroName == "CONCEPT_REQUIRES" || MacroName == "CONCEPT_REQUIRES_") |
| 3746 | return BinOp->getRHS(); |
| 3747 | |
| 3748 | return Cond; |
| 3749 | } |
| 3750 | |
| 3751 | namespace { |
| 3752 | |
| 3753 | // A PrinterHelper that prints more helpful diagnostics for some sub-expressions |
| 3754 | // within failing boolean expression, such as substituting template parameters |
| 3755 | // for actual types. |
| 3756 | class FailedBooleanConditionPrinterHelper : public PrinterHelper { |
| 3757 | public: |
| 3758 | explicit FailedBooleanConditionPrinterHelper(const PrintingPolicy &P) |
| 3759 | : Policy(P) {} |
| 3760 | |
| 3761 | bool handledStmt(Stmt *E, raw_ostream &OS) override { |
| 3762 | const auto *DR = dyn_cast<DeclRefExpr>(E); |
| 3763 | if (DR && DR->getQualifier()) { |
| 3764 | // If this is a qualified name, expand the template arguments in nested |
| 3765 | // qualifiers. |
| 3766 | DR->getQualifier()->print(OS, Policy, true); |
| 3767 | // Then print the decl itself. |
| 3768 | const ValueDecl *VD = DR->getDecl(); |
| 3769 | OS << VD->getName(); |
| 3770 | if (const auto *IV = dyn_cast<VarTemplateSpecializationDecl>(VD)) { |
| 3771 | // This is a template variable, print the expanded template arguments. |
| 3772 | printTemplateArgumentList( |
| 3773 | OS, IV->getTemplateArgs().asArray(), Policy, |
| 3774 | IV->getSpecializedTemplate()->getTemplateParameters()); |
| 3775 | } |
| 3776 | return true; |
| 3777 | } |
| 3778 | return false; |
| 3779 | } |
| 3780 | |
| 3781 | private: |
| 3782 | const PrintingPolicy Policy; |
| 3783 | }; |
| 3784 | |
| 3785 | } // end anonymous namespace |
| 3786 | |
| 3787 | std::pair<Expr *, std::string> |
| 3788 | Sema::findFailedBooleanCondition(Expr *Cond) { |
| 3789 | Cond = lookThroughRangesV3Condition(PP, Cond); |
| 3790 | |
| 3791 | // Separate out all of the terms in a conjunction. |
| 3792 | SmallVector<Expr *, 4> Terms; |
| 3793 | collectConjunctionTerms(Cond, Terms); |
| 3794 | |
| 3795 | // Determine which term failed. |
| 3796 | Expr *FailedCond = nullptr; |
| 3797 | for (Expr *Term : Terms) { |
| 3798 | Expr *TermAsWritten = Term->IgnoreParenImpCasts(); |
| 3799 | |
| 3800 | // Literals are uninteresting. |
| 3801 | if (isa<CXXBoolLiteralExpr>(TermAsWritten) || |
| 3802 | isa<IntegerLiteral>(TermAsWritten)) |
| 3803 | continue; |
| 3804 | |
| 3805 | // The initialization of the parameter from the argument is |
| 3806 | // a constant-evaluated context. |
| 3807 | EnterExpressionEvaluationContext ConstantEvaluated( |
| 3808 | *this, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
| 3809 | |
| 3810 | bool Succeeded; |
| 3811 | if (Term->EvaluateAsBooleanCondition(Succeeded, Context) && |
| 3812 | !Succeeded) { |
| 3813 | FailedCond = TermAsWritten; |
| 3814 | break; |
| 3815 | } |
| 3816 | } |
| 3817 | if (!FailedCond) |
| 3818 | FailedCond = Cond->IgnoreParenImpCasts(); |
| 3819 | |
| 3820 | std::string Description; |
| 3821 | { |
| 3822 | llvm::raw_string_ostream Out(Description); |
| 3823 | PrintingPolicy Policy = getPrintingPolicy(); |
| 3824 | Policy.PrintCanonicalTypes = true; |
| 3825 | FailedBooleanConditionPrinterHelper Helper(Policy); |
| 3826 | FailedCond->printPretty(Out, &Helper, Policy, 0, "\n", nullptr); |
| 3827 | } |
| 3828 | return { FailedCond, Description }; |
| 3829 | } |
| 3830 | |
| 3831 | QualType Sema::CheckTemplateIdType(TemplateName Name, |
| 3832 | SourceLocation TemplateLoc, |
| 3833 | TemplateArgumentListInfo &TemplateArgs) { |
| 3834 | DependentTemplateName *DTN |
| 3835 | = Name.getUnderlying().getAsDependentTemplateName(); |
| 3836 | if (DTN && DTN->isIdentifier()) |
| 3837 | // When building a template-id where the template-name is dependent, |
| 3838 | // assume the template is a type template. Either our assumption is |
| 3839 | // correct, or the code is ill-formed and will be diagnosed when the |
| 3840 | // dependent name is substituted. |
| 3841 | return Context.getDependentTemplateSpecializationType( |
| 3842 | ETK_None, DTN->getQualifier(), DTN->getIdentifier(), |
| 3843 | TemplateArgs.arguments()); |
| 3844 | |
| 3845 | if (Name.getAsAssumedTemplateName() && |
| 3846 | resolveAssumedTemplateNameAsType(/*Scope*/nullptr, Name, TemplateLoc)) |
| 3847 | return QualType(); |
| 3848 | |
| 3849 | TemplateDecl *Template = Name.getAsTemplateDecl(); |
| 3850 | if (!Template || isa<FunctionTemplateDecl>(Template) || |
| 3851 | isa<VarTemplateDecl>(Template) || isa<ConceptDecl>(Template)) { |
| 3852 | // We might have a substituted template template parameter pack. If so, |
| 3853 | // build a template specialization type for it. |
| 3854 | if (Name.getAsSubstTemplateTemplateParmPack()) |
| 3855 | return Context.getTemplateSpecializationType(Name, |
| 3856 | TemplateArgs.arguments()); |
| 3857 | |
| 3858 | Diag(TemplateLoc, diag::err_template_id_not_a_type) |
| 3859 | << Name; |
| 3860 | NoteAllFoundTemplates(Name); |
| 3861 | return QualType(); |
| 3862 | } |
| 3863 | |
| 3864 | // Check that the template argument list is well-formed for this |
| 3865 | // template. |
| 3866 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
| 3867 | if (CheckTemplateArgumentList(Template, TemplateLoc, TemplateArgs, false, |
| 3868 | SugaredConverted, CanonicalConverted, |
| 3869 | /*UpdateArgsWithConversions=*/true)) |
| 3870 | return QualType(); |
| 3871 | |
| 3872 | QualType CanonType; |
| 3873 | |
| 3874 | if (TypeAliasTemplateDecl *AliasTemplate = |
| 3875 | dyn_cast<TypeAliasTemplateDecl>(Template)) { |
| 3876 | |
| 3877 | // Find the canonical type for this type alias template specialization. |
| 3878 | TypeAliasDecl *Pattern = AliasTemplate->getTemplatedDecl(); |
| 3879 | if (Pattern->isInvalidDecl()) |
| 3880 | return QualType(); |
| 3881 | |
| 3882 | // Only substitute for the innermost template argument list. |
| 3883 | MultiLevelTemplateArgumentList TemplateArgLists; |
| 3884 | TemplateArgLists.addOuterTemplateArguments(Template, CanonicalConverted, |
| 3885 | /*Final=*/false); |
| 3886 | TemplateArgLists.addOuterRetainedLevels( |
| 3887 | AliasTemplate->getTemplateParameters()->getDepth()); |
| 3888 | |
| 3889 | LocalInstantiationScope Scope(*this); |
| 3890 | InstantiatingTemplate Inst(*this, TemplateLoc, Template); |
| 3891 | if (Inst.isInvalid()) |
| 3892 | return QualType(); |
| 3893 | |
| 3894 | CanonType = SubstType(Pattern->getUnderlyingType(), |
| 3895 | TemplateArgLists, AliasTemplate->getLocation(), |
| 3896 | AliasTemplate->getDeclName()); |
| 3897 | if (CanonType.isNull()) { |
| 3898 | // If this was enable_if and we failed to find the nested type |
| 3899 | // within enable_if in a SFINAE context, dig out the specific |
| 3900 | // enable_if condition that failed and present that instead. |
| 3901 | if (isEnableIfAliasTemplate(AliasTemplate)) { |
| 3902 | if (auto DeductionInfo = isSFINAEContext()) { |
| 3903 | if (*DeductionInfo && |
| 3904 | (*DeductionInfo)->hasSFINAEDiagnostic() && |
| 3905 | (*DeductionInfo)->peekSFINAEDiagnostic().second.getDiagID() == |
| 3906 | diag::err_typename_nested_not_found_enable_if && |
| 3907 | TemplateArgs[0].getArgument().getKind() |
| 3908 | == TemplateArgument::Expression) { |
| 3909 | Expr *FailedCond; |
| 3910 | std::string FailedDescription; |
| 3911 | std::tie(FailedCond, FailedDescription) = |
| 3912 | findFailedBooleanCondition(TemplateArgs[0].getSourceExpression()); |
| 3913 | |
| 3914 | // Remove the old SFINAE diagnostic. |
| 3915 | PartialDiagnosticAt OldDiag = |
| 3916 | {SourceLocation(), PartialDiagnostic::NullDiagnostic()}; |
| 3917 | (*DeductionInfo)->takeSFINAEDiagnostic(OldDiag); |
| 3918 | |
| 3919 | // Add a new SFINAE diagnostic specifying which condition |
| 3920 | // failed. |
| 3921 | (*DeductionInfo)->addSFINAEDiagnostic( |
| 3922 | OldDiag.first, |
| 3923 | PDiag(diag::err_typename_nested_not_found_requirement) |
| 3924 | << FailedDescription |
| 3925 | << FailedCond->getSourceRange()); |
| 3926 | } |
| 3927 | } |
| 3928 | } |
| 3929 | |
| 3930 | return QualType(); |
| 3931 | } |
| 3932 | } else if (auto *BTD = dyn_cast<BuiltinTemplateDecl>(Template)) { |
| 3933 | CanonType = checkBuiltinTemplateIdType(*this, BTD, SugaredConverted, |
| 3934 | TemplateLoc, TemplateArgs); |
| 3935 | } else if (Name.isDependent() || |
| 3936 | TemplateSpecializationType::anyDependentTemplateArguments( |
| 3937 | TemplateArgs, CanonicalConverted)) { |
| 3938 | // This class template specialization is a dependent |
| 3939 | // type. Therefore, its canonical type is another class template |
| 3940 | // specialization type that contains all of the converted |
| 3941 | // arguments in canonical form. This ensures that, e.g., A<T> and |
| 3942 | // A<T, T> have identical types when A is declared as: |
| 3943 | // |
| 3944 | // template<typename T, typename U = T> struct A; |
| 3945 | CanonType = Context.getCanonicalTemplateSpecializationType( |
| 3946 | Name, CanonicalConverted); |
| 3947 | |
| 3948 | // This might work out to be a current instantiation, in which |
| 3949 | // case the canonical type needs to be the InjectedClassNameType. |
| 3950 | // |
| 3951 | // TODO: in theory this could be a simple hashtable lookup; most |
| 3952 | // changes to CurContext don't change the set of current |
| 3953 | // instantiations. |
| 3954 | if (isa<ClassTemplateDecl>(Template)) { |
| 3955 | for (DeclContext *Ctx = CurContext; Ctx; Ctx = Ctx->getLookupParent()) { |
| 3956 | // If we get out to a namespace, we're done. |
| 3957 | if (Ctx->isFileContext()) break; |
| 3958 | |
| 3959 | // If this isn't a record, keep looking. |
| 3960 | CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Ctx); |
| 3961 | if (!Record) continue; |
| 3962 | |
| 3963 | // Look for one of the two cases with InjectedClassNameTypes |
| 3964 | // and check whether it's the same template. |
| 3965 | if (!isa<ClassTemplatePartialSpecializationDecl>(Record) && |
| 3966 | !Record->getDescribedClassTemplate()) |
| 3967 | continue; |
| 3968 | |
| 3969 | // Fetch the injected class name type and check whether its |
| 3970 | // injected type is equal to the type we just built. |
| 3971 | QualType ICNT = Context.getTypeDeclType(Record); |
| 3972 | QualType Injected = cast<InjectedClassNameType>(ICNT) |
| 3973 | ->getInjectedSpecializationType(); |
| 3974 | |
| 3975 | if (CanonType != Injected->getCanonicalTypeInternal()) |
| 3976 | continue; |
| 3977 | |
| 3978 | // If so, the canonical type of this TST is the injected |
| 3979 | // class name type of the record we just found. |
| 3980 | assert(ICNT.isCanonical())(static_cast <bool> (ICNT.isCanonical()) ? void (0) : __assert_fail ("ICNT.isCanonical()", "clang/lib/Sema/SemaTemplate.cpp", 3980 , __extension__ __PRETTY_FUNCTION__)); |
| 3981 | CanonType = ICNT; |
| 3982 | break; |
| 3983 | } |
| 3984 | } |
| 3985 | } else if (ClassTemplateDecl *ClassTemplate = |
| 3986 | dyn_cast<ClassTemplateDecl>(Template)) { |
| 3987 | // Find the class template specialization declaration that |
| 3988 | // corresponds to these arguments. |
| 3989 | void *InsertPos = nullptr; |
| 3990 | ClassTemplateSpecializationDecl *Decl = |
| 3991 | ClassTemplate->findSpecialization(CanonicalConverted, InsertPos); |
| 3992 | if (!Decl) { |
| 3993 | // This is the first time we have referenced this class template |
| 3994 | // specialization. Create the canonical declaration and add it to |
| 3995 | // the set of specializations. |
| 3996 | Decl = ClassTemplateSpecializationDecl::Create( |
| 3997 | Context, ClassTemplate->getTemplatedDecl()->getTagKind(), |
| 3998 | ClassTemplate->getDeclContext(), |
| 3999 | ClassTemplate->getTemplatedDecl()->getBeginLoc(), |
| 4000 | ClassTemplate->getLocation(), ClassTemplate, CanonicalConverted, |
| 4001 | nullptr); |
| 4002 | ClassTemplate->AddSpecialization(Decl, InsertPos); |
| 4003 | if (ClassTemplate->isOutOfLine()) |
| 4004 | Decl->setLexicalDeclContext(ClassTemplate->getLexicalDeclContext()); |
| 4005 | } |
| 4006 | |
| 4007 | if (Decl->getSpecializationKind() == TSK_Undeclared && |
| 4008 | ClassTemplate->getTemplatedDecl()->hasAttrs()) { |
| 4009 | InstantiatingTemplate Inst(*this, TemplateLoc, Decl); |
| 4010 | if (!Inst.isInvalid()) { |
| 4011 | MultiLevelTemplateArgumentList TemplateArgLists(Template, |
| 4012 | CanonicalConverted, |
| 4013 | /*Final=*/false); |
| 4014 | InstantiateAttrsForDecl(TemplateArgLists, |
| 4015 | ClassTemplate->getTemplatedDecl(), Decl); |
| 4016 | } |
| 4017 | } |
| 4018 | |
| 4019 | // Diagnose uses of this specialization. |
| 4020 | (void)DiagnoseUseOfDecl(Decl, TemplateLoc); |
| 4021 | |
| 4022 | CanonType = Context.getTypeDeclType(Decl); |
| 4023 | assert(isa<RecordType>(CanonType) &&(static_cast <bool> (isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType") ? void (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\"" , "clang/lib/Sema/SemaTemplate.cpp", 4024, __extension__ __PRETTY_FUNCTION__ )) |
| 4024 | "type of non-dependent specialization is not a RecordType")(static_cast <bool> (isa<RecordType>(CanonType) && "type of non-dependent specialization is not a RecordType") ? void (0) : __assert_fail ("isa<RecordType>(CanonType) && \"type of non-dependent specialization is not a RecordType\"" , "clang/lib/Sema/SemaTemplate.cpp", 4024, __extension__ __PRETTY_FUNCTION__ )); |
| 4025 | } else { |
| 4026 | llvm_unreachable("Unhandled template kind")::llvm::llvm_unreachable_internal("Unhandled template kind", "clang/lib/Sema/SemaTemplate.cpp" , 4026); |
| 4027 | } |
| 4028 | |
| 4029 | // Build the fully-sugared type for this class template |
| 4030 | // specialization, which refers back to the class template |
| 4031 | // specialization we created or found. |
| 4032 | return Context.getTemplateSpecializationType(Name, TemplateArgs.arguments(), |
| 4033 | CanonType); |
| 4034 | } |
| 4035 | |
| 4036 | void Sema::ActOnUndeclaredTypeTemplateName(Scope *S, TemplateTy &ParsedName, |
| 4037 | TemplateNameKind &TNK, |
| 4038 | SourceLocation NameLoc, |
| 4039 | IdentifierInfo *&II) { |
| 4040 | assert(TNK == TNK_Undeclared_template && "not an undeclared template name")(static_cast <bool> (TNK == TNK_Undeclared_template && "not an undeclared template name") ? void (0) : __assert_fail ("TNK == TNK_Undeclared_template && \"not an undeclared template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 4040, __extension__ __PRETTY_FUNCTION__ )); |
| 4041 | |
| 4042 | TemplateName Name = ParsedName.get(); |
| 4043 | auto *ATN = Name.getAsAssumedTemplateName(); |
| 4044 | assert(ATN && "not an assumed template name")(static_cast <bool> (ATN && "not an assumed template name" ) ? void (0) : __assert_fail ("ATN && \"not an assumed template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 4044, __extension__ __PRETTY_FUNCTION__ )); |
| 4045 | II = ATN->getDeclName().getAsIdentifierInfo(); |
| 4046 | |
| 4047 | if (!resolveAssumedTemplateNameAsType(S, Name, NameLoc, /*Diagnose*/false)) { |
| 4048 | // Resolved to a type template name. |
| 4049 | ParsedName = TemplateTy::make(Name); |
| 4050 | TNK = TNK_Type_template; |
| 4051 | } |
| 4052 | } |
| 4053 | |
| 4054 | bool Sema::resolveAssumedTemplateNameAsType(Scope *S, TemplateName &Name, |
| 4055 | SourceLocation NameLoc, |
| 4056 | bool Diagnose) { |
| 4057 | // We assumed this undeclared identifier to be an (ADL-only) function |
| 4058 | // template name, but it was used in a context where a type was required. |
| 4059 | // Try to typo-correct it now. |
| 4060 | AssumedTemplateStorage *ATN = Name.getAsAssumedTemplateName(); |
| 4061 | assert(ATN && "not an assumed template name")(static_cast <bool> (ATN && "not an assumed template name" ) ? void (0) : __assert_fail ("ATN && \"not an assumed template name\"" , "clang/lib/Sema/SemaTemplate.cpp", 4061, __extension__ __PRETTY_FUNCTION__ )); |
| 4062 | |
| 4063 | LookupResult R(*this, ATN->getDeclName(), NameLoc, LookupOrdinaryName); |
| 4064 | struct CandidateCallback : CorrectionCandidateCallback { |
| 4065 | bool ValidateCandidate(const TypoCorrection &TC) override { |
| 4066 | return TC.getCorrectionDecl() && |
| 4067 | getAsTypeTemplateDecl(TC.getCorrectionDecl()); |
| 4068 | } |
| 4069 | std::unique_ptr<CorrectionCandidateCallback> clone() override { |
| 4070 | return std::make_unique<CandidateCallback>(*this); |
| 4071 | } |
| 4072 | } FilterCCC; |
| 4073 | |
| 4074 | TypoCorrection Corrected = |
| 4075 | CorrectTypo(R.getLookupNameInfo(), R.getLookupKind(), S, nullptr, |
| 4076 | FilterCCC, CTK_ErrorRecovery); |
| 4077 | if (Corrected && Corrected.getFoundDecl()) { |
| 4078 | diagnoseTypo(Corrected, PDiag(diag::err_no_template_suggest) |
| 4079 | << ATN->getDeclName()); |
| 4080 | Name = TemplateName(Corrected.getCorrectionDeclAs<TemplateDecl>()); |
| 4081 | return false; |
| 4082 | } |
| 4083 | |
| 4084 | if (Diagnose) |
| 4085 | Diag(R.getNameLoc(), diag::err_no_template) << R.getLookupName(); |
| 4086 | return true; |
| 4087 | } |
| 4088 | |
| 4089 | TypeResult Sema::ActOnTemplateIdType( |
| 4090 | Scope *S, CXXScopeSpec &SS, SourceLocation TemplateKWLoc, |
| 4091 | TemplateTy TemplateD, IdentifierInfo *TemplateII, |
| 4092 | SourceLocation TemplateIILoc, SourceLocation LAngleLoc, |
| 4093 | ASTTemplateArgsPtr TemplateArgsIn, SourceLocation RAngleLoc, |
| 4094 | bool IsCtorOrDtorName, bool IsClassName, |
| 4095 | ImplicitTypenameContext AllowImplicitTypename) { |
| 4096 | if (SS.isInvalid()) |
| 4097 | return true; |
| 4098 | |
| 4099 | if (!IsCtorOrDtorName && !IsClassName && SS.isSet()) { |
| 4100 | DeclContext *LookupCtx = computeDeclContext(SS, /*EnteringContext*/false); |
| 4101 | |
| 4102 | // C++ [temp.res]p3: |
| 4103 | // A qualified-id that refers to a type and in which the |
| 4104 | // nested-name-specifier depends on a template-parameter (14.6.2) |
| 4105 | // shall be prefixed by the keyword typename to indicate that the |
| 4106 | // qualified-id denotes a type, forming an |
| 4107 | // elaborated-type-specifier (7.1.5.3). |
| 4108 | if (!LookupCtx && isDependentScopeSpecifier(SS)) { |
| 4109 | // C++2a relaxes some of those restrictions in [temp.res]p5. |
| 4110 | if (AllowImplicitTypename == ImplicitTypenameContext::Yes) { |
| 4111 | if (getLangOpts().CPlusPlus20) |
| 4112 | Diag(SS.getBeginLoc(), diag::warn_cxx17_compat_implicit_typename); |
| 4113 | else |
| 4114 | Diag(SS.getBeginLoc(), diag::ext_implicit_typename) |
| 4115 | << SS.getScopeRep() << TemplateII->getName() |
| 4116 | << FixItHint::CreateInsertion(SS.getBeginLoc(), "typename "); |
| 4117 | } else |
| 4118 | Diag(SS.getBeginLoc(), diag::err_typename_missing_template) |
| 4119 | << SS.getScopeRep() << TemplateII->getName(); |
| 4120 | |
| 4121 | // FIXME: This is not quite correct recovery as we don't transform SS |
| 4122 | // into the corresponding dependent form (and we don't diagnose missing |
| 4123 | // 'template' keywords within SS as a result). |
| 4124 | return ActOnTypenameType(nullptr, SourceLocation(), SS, TemplateKWLoc, |
| 4125 | TemplateD, TemplateII, TemplateIILoc, LAngleLoc, |
| 4126 | TemplateArgsIn, RAngleLoc); |
| 4127 | } |
| 4128 | |
| 4129 | // Per C++ [class.qual]p2, if the template-id was an injected-class-name, |
| 4130 | // it's not actually allowed to be used as a type in most cases. Because |
| 4131 | // we annotate it before we know whether it's valid, we have to check for |
| 4132 | // this case here. |
| 4133 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); |
| 4134 | if (LookupRD && LookupRD->getIdentifier() == TemplateII) { |
| 4135 | Diag(TemplateIILoc, |
| 4136 | TemplateKWLoc.isInvalid() |
| 4137 | ? diag::err_out_of_line_qualified_id_type_names_constructor |
| 4138 | : diag::ext_out_of_line_qualified_id_type_names_constructor) |
| 4139 | << TemplateII << 0 /*injected-class-name used as template name*/ |
| 4140 | << 1 /*if any keyword was present, it was 'template'*/; |
| 4141 | } |
| 4142 | } |
| 4143 | |
| 4144 | TemplateName Template = TemplateD.get(); |
| 4145 | if (Template.getAsAssumedTemplateName() && |
| 4146 | resolveAssumedTemplateNameAsType(S, Template, TemplateIILoc)) |
| 4147 | return true; |
| 4148 | |
| 4149 | // Translate the parser's template argument list in our AST format. |
| 4150 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
| 4151 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| 4152 | |
| 4153 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
| 4154 | assert(SS.getScopeRep() == DTN->getQualifier())(static_cast <bool> (SS.getScopeRep() == DTN->getQualifier ()) ? void (0) : __assert_fail ("SS.getScopeRep() == DTN->getQualifier()" , "clang/lib/Sema/SemaTemplate.cpp", 4154, __extension__ __PRETTY_FUNCTION__ )); |
| 4155 | QualType T = Context.getDependentTemplateSpecializationType( |
| 4156 | ETK_None, DTN->getQualifier(), DTN->getIdentifier(), |
| 4157 | TemplateArgs.arguments()); |
| 4158 | // Build type-source information. |
| 4159 | TypeLocBuilder TLB; |
| 4160 | DependentTemplateSpecializationTypeLoc SpecTL |
| 4161 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
| 4162 | SpecTL.setElaboratedKeywordLoc(SourceLocation()); |
| 4163 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 4164 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
| 4165 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
| 4166 | SpecTL.setLAngleLoc(LAngleLoc); |
| 4167 | SpecTL.setRAngleLoc(RAngleLoc); |
| 4168 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
| 4169 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| 4170 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
| 4171 | } |
| 4172 | |
| 4173 | QualType SpecTy = CheckTemplateIdType(Template, TemplateIILoc, TemplateArgs); |
| 4174 | if (SpecTy.isNull()) |
| 4175 | return true; |
| 4176 | |
| 4177 | // Build type-source information. |
| 4178 | TypeLocBuilder TLB; |
| 4179 | TemplateSpecializationTypeLoc SpecTL = |
| 4180 | TLB.push<TemplateSpecializationTypeLoc>(SpecTy); |
| 4181 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
| 4182 | SpecTL.setTemplateNameLoc(TemplateIILoc); |
| 4183 | SpecTL.setLAngleLoc(LAngleLoc); |
| 4184 | SpecTL.setRAngleLoc(RAngleLoc); |
| 4185 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
| 4186 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
| 4187 | |
| 4188 | // Create an elaborated-type-specifier containing the nested-name-specifier. |
| 4189 | QualType ElTy = getElaboratedType( |
| 4190 | ETK_None, !IsCtorOrDtorName ? SS : CXXScopeSpec(), SpecTy); |
| 4191 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(ElTy); |
| 4192 | ElabTL.setElaboratedKeywordLoc(SourceLocation()); |
| 4193 | if (!ElabTL.isEmpty()) |
| 4194 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 4195 | return CreateParsedType(ElTy, TLB.getTypeSourceInfo(Context, ElTy)); |
| 4196 | } |
| 4197 | |
| 4198 | TypeResult Sema::ActOnTagTemplateIdType(TagUseKind TUK, |
| 4199 | TypeSpecifierType TagSpec, |
| 4200 | SourceLocation TagLoc, |
| 4201 | CXXScopeSpec &SS, |
| 4202 | SourceLocation TemplateKWLoc, |
| 4203 | TemplateTy TemplateD, |
| 4204 | SourceLocation TemplateLoc, |
| 4205 | SourceLocation LAngleLoc, |
| 4206 | ASTTemplateArgsPtr TemplateArgsIn, |
| 4207 | SourceLocation RAngleLoc) { |
| 4208 | if (SS.isInvalid()) |
| 4209 | return TypeResult(true); |
| 4210 | |
| 4211 | TemplateName Template = TemplateD.get(); |
| 4212 | |
| 4213 | // Translate the parser's template argument list in our AST format. |
| 4214 | TemplateArgumentListInfo TemplateArgs(LAngleLoc, RAngleLoc); |
| 4215 | translateTemplateArguments(TemplateArgsIn, TemplateArgs); |
| 4216 | |
| 4217 | // Determine the tag kind |
| 4218 | TagTypeKind TagKind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); |
| 4219 | ElaboratedTypeKeyword Keyword |
| 4220 | = TypeWithKeyword::getKeywordForTagTypeKind(TagKind); |
| 4221 | |
| 4222 | if (DependentTemplateName *DTN = Template.getAsDependentTemplateName()) { |
| 4223 | assert(SS.getScopeRep() == DTN->getQualifier())(static_cast <bool> (SS.getScopeRep() == DTN->getQualifier ()) ? void (0) : __assert_fail ("SS.getScopeRep() == DTN->getQualifier()" , "clang/lib/Sema/SemaTemplate.cpp", 4223, __extension__ __PRETTY_FUNCTION__ )); |
| 4224 | QualType T = Context.getDependentTemplateSpecializationType( |
| 4225 | Keyword, DTN->getQualifier(), DTN->getIdentifier(), |
| 4226 | TemplateArgs.arguments()); |
| 4227 | |
| 4228 | // Build type-source information. |
| 4229 | TypeLocBuilder TLB; |
| 4230 | DependentTemplateSpecializationTypeLoc SpecTL |
| 4231 | = TLB.push<DependentTemplateSpecializationTypeLoc>(T); |
| 4232 | SpecTL.setElaboratedKeywordLoc(TagLoc); |
| 4233 | SpecTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 4234 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
| 4235 | SpecTL.setTemplateNameLoc(TemplateLoc); |
| 4236 | SpecTL.setLAngleLoc(LAngleLoc); |
| 4237 | SpecTL.setRAngleLoc(RAngleLoc); |
| 4238 | for (unsigned I = 0, N = SpecTL.getNumArgs(); I != N; ++I) |
| 4239 | SpecTL.setArgLocInfo(I, TemplateArgs[I].getLocInfo()); |
| 4240 | return CreateParsedType(T, TLB.getTypeSourceInfo(Context, T)); |
| 4241 | } |
| 4242 | |
| 4243 | if (TypeAliasTemplateDecl *TAT = |
| 4244 | dyn_cast_or_null<TypeAliasTemplateDecl>(Template.getAsTemplateDecl())) { |
| 4245 | // C++0x [dcl.type.elab]p2: |
| 4246 | // If the identifier resolves to a typedef-name or the simple-template-id |
| 4247 | // resolves to an alias template specialization, the |
| 4248 | // elaborated-type-specifier is ill-formed. |
| 4249 | Diag(TemplateLoc, diag::err_tag_reference_non_tag) |
| 4250 | << TAT << NTK_TypeAliasTemplate << TagKind; |
| 4251 | Diag(TAT->getLocation(), diag::note_declared_at); |
| 4252 | } |
| 4253 | |
| 4254 | QualType Result = CheckTemplateIdType(Template, TemplateLoc, TemplateArgs); |
| 4255 | if (Result.isNull()) |
| 4256 | return TypeResult(true); |
| 4257 | |
| 4258 | // Check the tag kind |
| 4259 | if (const RecordType *RT = Result->getAs<RecordType>()) { |
| 4260 | RecordDecl *D = RT->getDecl(); |
| 4261 | |
| 4262 | IdentifierInfo *Id = D->getIdentifier(); |
| 4263 | assert(Id && "templated class must have an identifier")(static_cast <bool> (Id && "templated class must have an identifier" ) ? void (0) : __assert_fail ("Id && \"templated class must have an identifier\"" , "clang/lib/Sema/SemaTemplate.cpp", 4263, __extension__ __PRETTY_FUNCTION__ )); |
| 4264 | |
| 4265 | if (!isAcceptableTagRedeclaration(D, TagKind, TUK == TUK_Definition, |
| 4266 | TagLoc, Id)) { |
| 4267 | Diag(TagLoc, diag::err_use_with_wrong_tag) |
| 4268 | << Result |
| 4269 | << FixItHint::CreateReplacement(SourceRange(TagLoc), D->getKindName()); |
| 4270 | Diag(D->getLocation(), diag::note_previous_use); |
| 4271 | } |
| 4272 | } |
| 4273 | |
| 4274 | // Provide source-location information for the template specialization. |
| 4275 | TypeLocBuilder TLB; |
| 4276 | TemplateSpecializationTypeLoc SpecTL |
| 4277 | = TLB.push<TemplateSpecializationTypeLoc>(Result); |
| 4278 | SpecTL.setTemplateKeywordLoc(TemplateKWLoc); |
| 4279 | SpecTL.setTemplateNameLoc(TemplateLoc); |
| 4280 | SpecTL.setLAngleLoc(LAngleLoc); |
| 4281 | SpecTL.setRAngleLoc(RAngleLoc); |
| 4282 | for (unsigned i = 0, e = SpecTL.getNumArgs(); i != e; ++i) |
| 4283 | SpecTL.setArgLocInfo(i, TemplateArgs[i].getLocInfo()); |
| 4284 | |
| 4285 | // Construct an elaborated type containing the nested-name-specifier (if any) |
| 4286 | // and tag keyword. |
| 4287 | Result = Context.getElaboratedType(Keyword, SS.getScopeRep(), Result); |
| 4288 | ElaboratedTypeLoc ElabTL = TLB.push<ElaboratedTypeLoc>(Result); |
| 4289 | ElabTL.setElaboratedKeywordLoc(TagLoc); |
| 4290 | ElabTL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 4291 | return CreateParsedType(Result, TLB.getTypeSourceInfo(Context, Result)); |
| 4292 | } |
| 4293 | |
| 4294 | static bool CheckTemplateSpecializationScope(Sema &S, NamedDecl *Specialized, |
| 4295 | NamedDecl *PrevDecl, |
| 4296 | SourceLocation Loc, |
| 4297 | bool IsPartialSpecialization); |
| 4298 | |
| 4299 | static TemplateSpecializationKind getTemplateSpecializationKind(Decl *D); |
| 4300 | |
| 4301 | static bool isTemplateArgumentTemplateParameter( |
| 4302 | const TemplateArgument &Arg, unsigned Depth, unsigned Index) { |
| 4303 | switch (Arg.getKind()) { |
| 4304 | case TemplateArgument::Null: |
| 4305 | case TemplateArgument::NullPtr: |
| 4306 | case TemplateArgument::Integral: |
| 4307 | case TemplateArgument::Declaration: |
| 4308 | case TemplateArgument::Pack: |
| 4309 | case TemplateArgument::TemplateExpansion: |
| 4310 | return false; |
| 4311 | |
| 4312 | case TemplateArgument::Type: { |
| 4313 | QualType Type = Arg.getAsType(); |
| 4314 | const TemplateTypeParmType *TPT = |
| 4315 | Arg.getAsType()->getAs<TemplateTypeParmType>(); |
| 4316 | return TPT && !Type.hasQualifiers() && |
| 4317 | TPT->getDepth() == Depth && TPT->getIndex() == Index; |
| 4318 | } |
| 4319 | |
| 4320 | case TemplateArgument::Expression: { |
| 4321 | DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Arg.getAsExpr()); |
| 4322 | if (!DRE || !DRE->getDecl()) |
| 4323 | return false; |
| 4324 | const NonTypeTemplateParmDecl *NTTP = |
| 4325 | dyn_cast<NonTypeTemplateParmDecl>(DRE->getDecl()); |
| 4326 | return NTTP && NTTP->getDepth() == Depth && NTTP->getIndex() == Index; |
| 4327 | } |
| 4328 | |
| 4329 | case TemplateArgument::Template: |
| 4330 | const TemplateTemplateParmDecl *TTP = |
| 4331 | dyn_cast_or_null<TemplateTemplateParmDecl>( |
| 4332 | Arg.getAsTemplateOrTemplatePattern().getAsTemplateDecl()); |
| 4333 | return TTP && TTP->getDepth() == Depth && TTP->getIndex() == Index; |
| 4334 | } |
| 4335 | llvm_unreachable("unexpected kind of template argument")::llvm::llvm_unreachable_internal("unexpected kind of template argument" , "clang/lib/Sema/SemaTemplate.cpp", 4335); |
| 4336 | } |
| 4337 | |
| 4338 | static bool isSameAsPrimaryTemplate(TemplateParameterList *Params, |
| 4339 | ArrayRef<TemplateArgument> Args) { |
| 4340 | if (Params->size() != Args.size()) |
| 4341 | return false; |
| 4342 | |
| 4343 | unsigned Depth = Params->getDepth(); |
| 4344 | |
| 4345 | for (unsigned I = 0, N = Args.size(); I != N; ++I) { |
| 4346 | TemplateArgument Arg = Args[I]; |
| 4347 | |
| 4348 | // If the parameter is a pack expansion, the argument must be a pack |
| 4349 | // whose only element is a pack expansion. |
| 4350 | if (Params->getParam(I)->isParameterPack()) { |
| 4351 | if (Arg.getKind() != TemplateArgument::Pack || Arg.pack_size() != 1 || |
| 4352 | !Arg.pack_begin()->isPackExpansion()) |
| 4353 | return false; |
| 4354 | Arg = Arg.pack_begin()->getPackExpansionPattern(); |
| 4355 | } |
| 4356 | |
| 4357 | if (!isTemplateArgumentTemplateParameter(Arg, Depth, I)) |
| 4358 | return false; |
| 4359 | } |
| 4360 | |
| 4361 | return true; |
| 4362 | } |
| 4363 | |
| 4364 | template<typename PartialSpecDecl> |
| 4365 | static void checkMoreSpecializedThanPrimary(Sema &S, PartialSpecDecl *Partial) { |
| 4366 | if (Partial->getDeclContext()->isDependentContext()) |
| 4367 | return; |
| 4368 | |
| 4369 | // FIXME: Get the TDK from deduction in order to provide better diagnostics |
| 4370 | // for non-substitution-failure issues? |
| 4371 | TemplateDeductionInfo Info(Partial->getLocation()); |
| 4372 | if (S.isMoreSpecializedThanPrimary(Partial, Info)) |
| 4373 | return; |
| 4374 | |
| 4375 | auto *Template = Partial->getSpecializedTemplate(); |
| 4376 | S.Diag(Partial->getLocation(), |
| 4377 | diag::ext_partial_spec_not_more_specialized_than_primary) |
| 4378 | << isa<VarTemplateDecl>(Template); |
| 4379 | |
| 4380 | if (Info.hasSFINAEDiagnostic()) { |
| 4381 | PartialDiagnosticAt Diag = {SourceLocation(), |
| 4382 | PartialDiagnostic::NullDiagnostic()}; |
| 4383 | Info.takeSFINAEDiagnostic(Diag); |
| 4384 | SmallString<128> SFINAEArgString; |
| 4385 | Diag.second.EmitToString(S.getDiagnostics(), SFINAEArgString); |
| 4386 | S.Diag(Diag.first, |
| 4387 | diag::note_partial_spec_not_more_specialized_than_primary) |
| 4388 | << SFINAEArgString; |
| 4389 | } |
| 4390 | |
| 4391 | S.Diag(Template->getLocation(), diag::note_template_decl_here); |
| 4392 | SmallVector<const Expr *, 3> PartialAC, TemplateAC; |
| 4393 | Template->getAssociatedConstraints(TemplateAC); |
| 4394 | Partial->getAssociatedConstraints(PartialAC); |
| 4395 | S.MaybeEmitAmbiguousAtomicConstraintsDiagnostic(Partial, PartialAC, Template, |
| 4396 | TemplateAC); |
| 4397 | } |
| 4398 | |
| 4399 | static void |
| 4400 | noteNonDeducibleParameters(Sema &S, TemplateParameterList *TemplateParams, |
| 4401 | const llvm::SmallBitVector &DeducibleParams) { |
| 4402 | for (unsigned I = 0, N = DeducibleParams.size(); I != N; ++I) { |
| 4403 | if (!DeducibleParams[I]) { |
| 4404 | NamedDecl *Param = TemplateParams->getParam(I); |
| 4405 | if (Param->getDeclName()) |
| 4406 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) |
| 4407 | << Param->getDeclName(); |
| 4408 | else |
| 4409 | S.Diag(Param->getLocation(), diag::note_non_deducible_parameter) |
| 4410 | << "(anonymous)"; |
| 4411 | } |
| 4412 | } |
| 4413 | } |
| 4414 | |
| 4415 | |
| 4416 | template<typename PartialSpecDecl> |
| 4417 | static void checkTemplatePartialSpecialization(Sema &S, |
| 4418 | PartialSpecDecl *Partial) { |
| 4419 | // C++1z [temp.class.spec]p8: (DR1495) |
| 4420 | // - The specialization shall be more specialized than the primary |
| 4421 | // template (14.5.5.2). |
| 4422 | checkMoreSpecializedThanPrimary(S, Partial); |
| 4423 | |
| 4424 | // C++ [temp.class.spec]p8: (DR1315) |
| 4425 | // - Each template-parameter shall appear at least once in the |
| 4426 | // template-id outside a non-deduced context. |
| 4427 | // C++1z [temp.class.spec.match]p3 (P0127R2) |
| 4428 | // If the template arguments of a partial specialization cannot be |
| 4429 | // deduced because of the structure of its template-parameter-list |
| 4430 | // and the template-id, the program is ill-formed. |
| 4431 | auto *TemplateParams = Partial->getTemplateParameters(); |
| 4432 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); |
| 4433 | S.MarkUsedTemplateParameters(Partial->getTemplateArgs(), true, |
| 4434 | TemplateParams->getDepth(), DeducibleParams); |
| 4435 | |
| 4436 | if (!DeducibleParams.all()) { |
| 4437 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); |
| 4438 | S.Diag(Partial->getLocation(), diag::ext_partial_specs_not_deducible) |
| 4439 | << isa<VarTemplatePartialSpecializationDecl>(Partial) |
| 4440 | << (NumNonDeducible > 1) |
| 4441 | << SourceRange(Partial->getLocation(), |
| 4442 | Partial->getTemplateArgsAsWritten()->RAngleLoc); |
| 4443 | noteNonDeducibleParameters(S, TemplateParams, DeducibleParams); |
| 4444 | } |
| 4445 | } |
| 4446 | |
| 4447 | void Sema::CheckTemplatePartialSpecialization( |
| 4448 | ClassTemplatePartialSpecializationDecl *Partial) { |
| 4449 | checkTemplatePartialSpecialization(*this, Partial); |
| 4450 | } |
| 4451 | |
| 4452 | void Sema::CheckTemplatePartialSpecialization( |
| 4453 | VarTemplatePartialSpecializationDecl *Partial) { |
| 4454 | checkTemplatePartialSpecialization(*this, Partial); |
| 4455 | } |
| 4456 | |
| 4457 | void Sema::CheckDeductionGuideTemplate(FunctionTemplateDecl *TD) { |
| 4458 | // C++1z [temp.param]p11: |
| 4459 | // A template parameter of a deduction guide template that does not have a |
| 4460 | // default-argument shall be deducible from the parameter-type-list of the |
| 4461 | // deduction guide template. |
| 4462 | auto *TemplateParams = TD->getTemplateParameters(); |
| 4463 | llvm::SmallBitVector DeducibleParams(TemplateParams->size()); |
| 4464 | MarkDeducedTemplateParameters(TD, DeducibleParams); |
| 4465 | for (unsigned I = 0; I != TemplateParams->size(); ++I) { |
| 4466 | // A parameter pack is deducible (to an empty pack). |
| 4467 | auto *Param = TemplateParams->getParam(I); |
| 4468 | if (Param->isParameterPack() || hasVisibleDefaultArgument(Param)) |
| 4469 | DeducibleParams[I] = true; |
| 4470 | } |
| 4471 | |
| 4472 | if (!DeducibleParams.all()) { |
| 4473 | unsigned NumNonDeducible = DeducibleParams.size() - DeducibleParams.count(); |
| 4474 | Diag(TD->getLocation(), diag::err_deduction_guide_template_not_deducible) |
| 4475 | << (NumNonDeducible > 1); |
| 4476 | noteNonDeducibleParameters(*this, TemplateParams, DeducibleParams); |
| 4477 | } |
| 4478 | } |
| 4479 | |
| 4480 | DeclResult Sema::ActOnVarTemplateSpecialization( |
| 4481 | Scope *S, Declarator &D, TypeSourceInfo *DI, SourceLocation TemplateKWLoc, |
| 4482 | TemplateParameterList *TemplateParams, StorageClass SC, |
| 4483 | bool IsPartialSpecialization) { |
| 4484 | // D must be variable template id. |
| 4485 | assert(D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId &&(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind ::IK_TemplateId && "Variable template specialization is declared with a template id." ) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template id.\"" , "clang/lib/Sema/SemaTemplate.cpp", 4486, __extension__ __PRETTY_FUNCTION__ )) |
| 4486 | "Variable template specialization is declared with a template id.")(static_cast <bool> (D.getName().getKind() == UnqualifiedIdKind ::IK_TemplateId && "Variable template specialization is declared with a template id." ) ? void (0) : __assert_fail ("D.getName().getKind() == UnqualifiedIdKind::IK_TemplateId && \"Variable template specialization is declared with a template id.\"" , "clang/lib/Sema/SemaTemplate.cpp", 4486, __extension__ __PRETTY_FUNCTION__ )); |
| 4487 | |
| 4488 | TemplateIdAnnotation *TemplateId = D.getName().TemplateId; |
| 4489 | TemplateArgumentListInfo TemplateArgs = |
| 4490 | makeTemplateArgumentListInfo(*this, *TemplateId); |
| 4491 | SourceLocation TemplateNameLoc = D.getIdentifierLoc(); |
| 4492 | SourceLocation LAngleLoc = TemplateId->LAngleLoc; |
| 4493 | SourceLocation RAngleLoc = TemplateId->RAngleLoc; |
| 4494 | |
| 4495 | TemplateName Name = TemplateId->Template.get(); |
| 4496 | |
| 4497 | // The template-id must name a variable template. |
| 4498 | VarTemplateDecl *VarTemplate = |
| 4499 | dyn_cast_or_null<VarTemplateDecl>(Name.getAsTemplateDecl()); |
| 4500 | if (!VarTemplate) { |
| 4501 | NamedDecl *FnTemplate; |
| 4502 | if (auto *OTS = Name.getAsOverloadedTemplate()) |
| 4503 | FnTemplate = *OTS->begin(); |
| 4504 | else |
| 4505 | FnTemplate = dyn_cast_or_null<FunctionTemplateDecl>(Name.getAsTemplateDecl()); |
| 4506 | if (FnTemplate) |
| 4507 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template_but_method) |
| 4508 | << FnTemplate->getDeclName(); |
| 4509 | return Diag(D.getIdentifierLoc(), diag::err_var_spec_no_template) |
| 4510 | << IsPartialSpecialization; |
| 4511 | } |
| 4512 | |
| 4513 | // Check for unexpanded parameter packs in any of the template arguments. |
| 4514 | for (unsigned I = 0, N = TemplateArgs.size(); I != N; ++I) |
| 4515 | if (DiagnoseUnexpandedParameterPack(TemplateArgs[I], |
| 4516 | UPPC_PartialSpecialization)) |
| 4517 | return true; |
| 4518 | |
| 4519 | // Check that the template argument list is well-formed for this |
| 4520 | // template. |
| 4521 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
| 4522 | if (CheckTemplateArgumentList(VarTemplate, TemplateNameLoc, TemplateArgs, |
| 4523 | false, SugaredConverted, CanonicalConverted, |
| 4524 | /*UpdateArgsWithConversions=*/true)) |
| 4525 | return true; |
| 4526 | |
| 4527 | // Find the variable template (partial) specialization declaration that |
| 4528 | // corresponds to these arguments. |
| 4529 | if (IsPartialSpecialization) { |
| 4530 | if (CheckTemplatePartialSpecializationArgs(TemplateNameLoc, VarTemplate, |
| 4531 | TemplateArgs.size(), |
| 4532 | CanonicalConverted)) |
| 4533 | return true; |
| 4534 | |
| 4535 | // FIXME: Move these checks to CheckTemplatePartialSpecializationArgs so we |
| 4536 | // also do them during instantiation. |
| 4537 | if (!Name.isDependent() && |
| 4538 | !TemplateSpecializationType::anyDependentTemplateArguments( |
| 4539 | TemplateArgs, CanonicalConverted)) { |
| 4540 | Diag(TemplateNameLoc, diag::err_partial_spec_fully_specialized) |
| 4541 | << VarTemplate->getDeclName(); |
| 4542 | IsPartialSpecialization = false; |
| 4543 | } |
| 4544 | |
| 4545 | if (isSameAsPrimaryTemplate(VarTemplate->getTemplateParameters(), |
| 4546 | CanonicalConverted) && |
| 4547 | (!Context.getLangOpts().CPlusPlus20 || |
| 4548 | !TemplateParams->hasAssociatedConstraints())) { |
| 4549 | // C++ [temp.class.spec]p9b3: |
| 4550 | // |
| 4551 | // -- The argument list of the specialization shall not be identical |
| 4552 | // to the implicit argument list of the primary template. |
| 4553 | Diag(TemplateNameLoc, diag::err_partial_spec_args_match_primary_template) |
| 4554 | << /*variable template*/ 1 |
| 4555 | << /*is definition*/(SC != SC_Extern && !CurContext->isRecord()) |
| 4556 | << FixItHint::CreateRemoval(SourceRange(LAngleLoc, RAngleLoc)); |
| 4557 | // FIXME: Recover from this by treating the declaration as a redeclaration |
| 4558 | // of the primary template. |
| 4559 | return true; |
| 4560 | } |
| 4561 | } |
| 4562 | |
| 4563 | void *InsertPos = nullptr; |
| 4564 | VarTemplateSpecializationDecl *PrevDecl = nullptr; |
| 4565 | |
| 4566 | if (IsPartialSpecialization) |
| 4567 | PrevDecl = VarTemplate->findPartialSpecialization( |
| 4568 | CanonicalConverted, TemplateParams, InsertPos); |
| 4569 | else |
| 4570 | PrevDecl = VarTemplate->findSpecialization(CanonicalConverted, InsertPos); |
| 4571 | |
| 4572 | VarTemplateSpecializationDecl *Specialization = nullptr; |
| 4573 | |
| 4574 | // Check whether we can declare a variable template specialization in |
| 4575 | // the current scope. |
| 4576 | if (CheckTemplateSpecializationScope(*this, VarTemplate, PrevDecl, |
| 4577 | TemplateNameLoc, |
| 4578 | IsPartialSpecialization)) |
| 4579 | return true; |
| 4580 | |
| 4581 | if (PrevDecl && PrevDecl->getSpecializationKind() == TSK_Undeclared) { |
| 4582 | // Since the only prior variable template specialization with these |
| 4583 | // arguments was referenced but not declared, reuse that |
| 4584 | // declaration node as our own, updating its source location and |
| 4585 | // the list of outer template parameters to reflect our new declaration. |
| 4586 | Specialization = PrevDecl; |
| 4587 | Specialization->setLocation(TemplateNameLoc); |
| 4588 | PrevDecl = nullptr; |
| 4589 | } else if (IsPartialSpecialization) { |
| 4590 | // Create a new class template partial specialization declaration node. |
| 4591 | VarTemplatePartialSpecializationDecl *PrevPartial = |
| 4592 | cast_or_null<VarTemplatePartialSpecializationDecl>(PrevDecl); |
| 4593 | VarTemplatePartialSpecializationDecl *Partial = |
| 4594 | VarTemplatePartialSpecializationDecl::Create( |
| 4595 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, |
| 4596 | TemplateNameLoc, TemplateParams, VarTemplate, DI->getType(), DI, SC, |
| 4597 | CanonicalConverted, TemplateArgs); |
| 4598 | |
| 4599 | if (!PrevPartial) |
| 4600 | VarTemplate->AddPartialSpecialization(Partial, InsertPos); |
| 4601 | Specialization = Partial; |
| 4602 | |
| 4603 | // If we are providing an explicit specialization of a member variable |
| 4604 | // template specialization, make a note of that. |
| 4605 | if (PrevPartial && PrevPartial->getInstantiatedFromMember()) |
| 4606 | PrevPartial->setMemberSpecialization(); |
| 4607 | |
| 4608 | CheckTemplatePartialSpecialization(Partial); |
| 4609 | } else { |
| 4610 | // Create a new class template specialization declaration node for |
| 4611 | // this explicit specialization or friend declaration. |
| 4612 | Specialization = VarTemplateSpecializationDecl::Create( |
| 4613 | Context, VarTemplate->getDeclContext(), TemplateKWLoc, TemplateNameLoc, |
| 4614 | VarTemplate, DI->getType(), DI, SC, CanonicalConverted); |
| 4615 | Specialization->setTemplateArgsInfo(TemplateArgs); |
| 4616 | |
| 4617 | if (!PrevDecl) |
| 4618 | VarTemplate->AddSpecialization(Specialization, InsertPos); |
| 4619 | } |
| 4620 | |
| 4621 | // C++ [temp.expl.spec]p6: |
| 4622 | // If a template, a member template or the member of a class template is |
| 4623 | // explicitly specialized then that specialization shall be declared |
| 4624 | // before the first use of that specialization that would cause an implicit |
| 4625 | // instantiation to take place, in every translation unit in which such a |
| 4626 | // use occurs; no diagnostic is required. |
| 4627 | if (PrevDecl && PrevDecl->getPointOfInstantiation().isValid()) { |
| 4628 | bool Okay = false; |
| 4629 | for (Decl *Prev = PrevDecl; Prev; Prev = Prev->getPreviousDecl()) { |
| 4630 | // Is there any previous explicit specialization declaration? |
| 4631 | if (getTemplateSpecializationKind(Prev) == TSK_ExplicitSpecialization) { |
| 4632 | Okay = true; |
| 4633 | break; |
| 4634 | } |
| 4635 | } |
| 4636 | |
| 4637 | if (!Okay) { |
| 4638 | SourceRange Range(TemplateNameLoc, RAngleLoc); |
| 4639 | Diag(TemplateNameLoc, diag::err_specialization_after_instantiation) |
| 4640 | << Name << Range; |
| 4641 | |
| 4642 | Diag(PrevDecl->getPointOfInstantiation(), |
| 4643 | diag::note_instantiation_required_here) |
| 4644 | << (PrevDecl->getTemplateSpecializationKind() != |
| 4645 | TSK_ImplicitInstantiation); |
| 4646 | return true; |
| 4647 | } |
| 4648 | } |
| 4649 | |
| 4650 | Specialization->setTemplateKeywordLoc(TemplateKWLoc); |
| 4651 | Specialization->setLexicalDeclContext(CurContext); |
| 4652 | |
| 4653 | // Add the specialization into its lexical context, so that it can |
| 4654 | // be seen when iterating through the list of declarations in that |
| 4655 | // context. However, specializations are not found by name lookup. |
| 4656 | CurContext->addDecl(Specialization); |
| 4657 | |
| 4658 | // Note that this is an explicit specialization. |
| 4659 | Specialization->setSpecializationKind(TSK_ExplicitSpecialization); |
| 4660 | |
| 4661 | if (PrevDecl) { |
| 4662 | // Check that this isn't a redefinition of this specialization, |
| 4663 | // merging with previous declarations. |
| 4664 | LookupResult PrevSpec(*this, GetNameForDeclarator(D), LookupOrdinaryName, |
| 4665 | forRedeclarationInCurContext()); |
| 4666 | PrevSpec.addDecl(PrevDecl); |
| 4667 | D.setRedeclaration(CheckVariableDeclaration(Specialization, PrevSpec)); |
| 4668 | } else if (Specialization->isStaticDataMember() && |
| 4669 | Specialization->isOutOfLine()) { |
| 4670 | Specialization->setAccess(VarTemplate->getAccess()); |
| 4671 | } |
| 4672 | |
| 4673 | return Specialization; |
| 4674 | } |
| 4675 | |
| 4676 | namespace { |
| 4677 | /// A partial specialization whose template arguments have matched |
| 4678 | /// a given template-id. |
| 4679 | struct PartialSpecMatchResult { |
| 4680 | VarTemplatePartialSpecializationDecl *Partial; |
| 4681 | TemplateArgumentList *Args; |
| 4682 | }; |
| 4683 | } // end anonymous namespace |
| 4684 | |
| 4685 | DeclResult |
| 4686 | Sema::CheckVarTemplateId(VarTemplateDecl *Template, SourceLocation TemplateLoc, |
| 4687 | SourceLocation TemplateNameLoc, |
| 4688 | const TemplateArgumentListInfo &TemplateArgs) { |
| 4689 | assert(Template && "A variable template id without template?")(static_cast <bool> (Template && "A variable template id without template?" ) ? void (0) : __assert_fail ("Template && \"A variable template id without template?\"" , "clang/lib/Sema/SemaTemplate.cpp", 4689, __extension__ __PRETTY_FUNCTION__ )); |
| 4690 | |
| 4691 | // Check that the template argument list is well-formed for this template. |
| 4692 | SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
| 4693 | if (CheckTemplateArgumentList( |
| 4694 | Template, TemplateNameLoc, |
| 4695 | const_cast<TemplateArgumentListInfo &>(TemplateArgs), false, |
| 4696 | SugaredConverted, CanonicalConverted, |
| 4697 | /*UpdateArgsWithConversions=*/true)) |
| 4698 | return true; |
| 4699 | |
| 4700 | // Produce a placeholder value if the specialization is dependent. |
| 4701 | if (Template->getDeclContext()->isDependentContext() || |
| 4702 | TemplateSpecializationType::anyDependentTemplateArguments( |
| 4703 | TemplateArgs, CanonicalConverted)) |
| 4704 | return DeclResult(); |
| 4705 | |
| 4706 | // Find the variable template specialization declaration that |
| 4707 | // corresponds to these arguments. |
| 4708 | void *InsertPos = nullptr; |
| 4709 | if (VarTemplateSpecializationDecl *Spec = |
| 4710 | Template->findSpecialization(CanonicalConverted, InsertPos)) { |
| 4711 | checkSpecializationReachability(TemplateNameLoc, Spec); |
| 4712 | // If we already have a variable template specialization, return it. |
| 4713 | return Spec; |
| 4714 | } |
| 4715 | |
| 4716 | // This is the first time we have referenced this variable template |
| 4717 | // specialization. Create the canonical declaration and add it to |
| 4718 | // the set of specializations, based on the closest partial specialization |
| 4719 | // that it represents. That is, |
| 4720 | VarDecl *InstantiationPattern = Template->getTemplatedDecl(); |
| 4721 | TemplateArgumentList TemplateArgList(TemplateArgumentList::OnStack, |
| 4722 | CanonicalConverted); |
| 4723 | TemplateArgumentList *InstantiationArgs = &TemplateArgList; |
| 4724 | bool AmbiguousPartialSpec = false; |
| 4725 | typedef PartialSpecMatchResult MatchResult; |
| 4726 | SmallVector<MatchResult, 4> Matched; |
| 4727 | SourceLocation PointOfInstantiation = TemplateNameLoc; |
| 4728 | TemplateSpecCandidateSet FailedCandidates(PointOfInstantiation, |
| 4729 | /*ForTakingAddress=*/false); |
| 4730 | |
| 4731 | // 1. Attempt to find the closest partial specialization that this |
| 4732 | // specializes, if any. |
| 4733 | // TODO: Unify with InstantiateClassTemplateSpecialization()? |
| 4734 | // Perhaps better after unification of DeduceTemplateArguments() and |
| 4735 | // getMoreSpecializedPartialSpecialization(). |
| 4736 | SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs; |
| 4737 | Template->getPartialSpecializations(PartialSpecs); |
| 4738 | |
| 4739 | for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I) { |
| 4740 | VarTemplatePartialSpecializationDecl *Partial = PartialSpecs[I]; |
| 4741 | TemplateDeductionInfo Info(FailedCandidates.getLocation()); |
| 4742 | |
| 4743 | if (TemplateDeductionResult Result = |
| 4744 | DeduceTemplateArguments(Partial, TemplateArgList, Info)) { |
| 4745 | // Store the failed-deduction information for use in diagnostics, later. |
| 4746 | // TODO: Actually use the failed-deduction info? |
| 4747 | FailedCandidates.addCandidate().set( |
| 4748 | DeclAccessPair::make(Template, AS_public), Partial, |
| 4749 | MakeDeductionFailureInfo(Context, Result, Info)); |
| 4750 | (void)Result; |
| 4751 | } else { |
| 4752 | Matched.push_back(PartialSpecMatchResult()); |
| 4753 | Matched.back().Partial = Partial; |
| 4754 | Matched.back().Args = Info.takeCanonical(); |
| 4755 | } |
| 4756 | } |
| 4757 | |
| 4758 | if (Matched.size() >= 1) { |
| 4759 | SmallVector<MatchResult, 4>::iterator Best = Matched.begin(); |
| 4760 | if (Matched.size() == 1) { |
| 4761 | // -- If exactly one matching specialization is found, the |
| 4762 | // instantiation is generated from that specialization. |
| 4763 | // We don't need to do anything for this. |
| 4764 | } else { |
| 4765 | // -- If more than one matching specialization is found, the |
| 4766 | // partial order rules (14.5.4.2) are used to determine |
| 4767 | // whether one of the specializations is more specialized |
| 4768 | // than the others. If none of the specializations is more |
| 4769 | // specialized than all of the other matching |
| 4770 | // specializations, then the use of the variable template is |
| 4771 | // ambiguous and the program is ill-formed. |
| 4772 | for (SmallVector<MatchResult, 4>::iterator P = Best + 1, |
| 4773 | PEnd = Matched.end(); |
| 4774 | P != PEnd; ++P) { |
| 4775 | if (getMoreSpecializedPartialSpecialization(P->Partial, Best->Partial, |
| 4776 | PointOfInstantiation) == |
| 4777 | P->Partial) |
| 4778 | Best = P; |
| 4779 | } |
| 4780 | |
| 4781 | // Determine if the best partial specialization is more specialized than |
| 4782 | // the others. |
| 4783 | for (SmallVector<MatchResult, 4>::iterator P = Matched.begin(), |
| 4784 | PEnd = Matched.end(); |
| 4785 | P != PEnd; ++P) { |
| 4786 | if (P != Best && getMoreSpecializedPartialSpecialization( |
| 4787 | P->Partial, Best->Partial, |
| 4788 | PointOfInstantiation) != Best->Partial) { |
| 4789 | AmbiguousPartialSpec = true; |
| 4790 | break; |
| 4791 | } |
| 4792 | } |
| 4793 | } |
| 4794 | |
| 4795 | // Instantiate using the best variable template partial specialization. |
| 4796 | InstantiationPattern = Best->Partial; |
| 4797 | InstantiationArgs = Best->Args; |
| 4798 | } else { |
| 4799 | // -- If no match is found, the instantiation is generated |
| 4800 | // from the primary template. |
| 4801 | // InstantiationPattern = Template->getTemplatedDecl(); |
| 4802 | } |
| 4803 | |
| 4804 | // 2. Create the canonical declaration. |
| 4805 | // Note that we do not instantiate a definition until we see an odr-use |
| 4806 | // in DoMarkVarDeclReferenced(). |
| 4807 | // FIXME: LateAttrs et al.? |
| 4808 | VarTemplateSpecializationDecl *Decl = BuildVarTemplateInstantiation( |
| 4809 | Template, InstantiationPattern, *InstantiationArgs, TemplateArgs, |
| 4810 | CanonicalConverted, TemplateNameLoc /*, LateAttrs, StartingScope*/); |
| 4811 | if (!Decl) |
| 4812 | return true; |
| 4813 | |
| 4814 | if (AmbiguousPartialSpec) { |
| 4815 | // Partial ordering did not produce a clear winner. Complain. |
| 4816 | Decl->setInvalidDecl(); |
| 4817 | Diag(PointOfInstantiation, diag::err_partial_spec_ordering_ambiguous) |
| 4818 | << Decl; |
| 4819 | |
| 4820 | // Print the matching partial specializations. |
| 4821 | for (MatchResult P : Matched) |
| 4822 | Diag(P.Partial->getLocation(), diag::note_partial_spec_match) |
| 4823 | << getTemplateArgumentBindingsText(P.Partial->getTemplateParameters(), |
| 4824 | *P.Args); |
| 4825 | return true; |
| 4826 | } |
| 4827 | |
| 4828 | if (VarTemplatePartialSpecializationDecl *D = |
| 4829 | dyn_cast<VarTemplatePartialSpecializationDecl>(InstantiationPattern)) |
| 4830 | Decl->setInstantiationOf(D, InstantiationArgs); |
| 4831 | |
| 4832 | checkSpecializationReachability(TemplateNameLoc, Decl); |
| 4833 | |
| 4834 | assert(Decl && "No variable template specialization?")(static_cast <bool> (Decl && "No variable template specialization?" ) ? void (0) : __assert_fail ("Decl && \"No variable template specialization?\"" , "clang/lib/Sema/SemaTemplate.cpp", 4834, __extension__ __PRETTY_FUNCTION__ )); |
| 4835 | return Decl; |
| 4836 | } |
| 4837 | |
| 4838 | ExprResult |
| 4839 | Sema::CheckVarTemplateId(const CXXScopeSpec &SS, |
| 4840 | const DeclarationNameInfo &NameInfo, |
| 4841 | VarTemplateDecl *Template, SourceLocation TemplateLoc, |
| 4842 | const TemplateArgumentListInfo *TemplateArgs) { |
| 4843 | |
| 4844 | DeclResult Decl = CheckVarTemplateId(Template, TemplateLoc, NameInfo.getLoc(), |
| 4845 | *TemplateArgs); |
| 4846 | if (Decl.isInvalid()) |
| 4847 | return ExprError(); |
| 4848 | |
| 4849 | if (!Decl.get()) |
| 4850 | return ExprResult(); |
| 4851 | |
| 4852 | VarDecl *Var = cast<VarDecl>(Decl.get()); |
| 4853 | if (!Var->getTemplateSpecializationKind()) |
| 4854 | Var->setTemplateSpecializationKind(TSK_ImplicitInstantiation, |
| 4855 | NameInfo.getLoc()); |
| 4856 | |
| 4857 | // Build an ordinary singleton decl ref. |
| 4858 | return BuildDeclarationNameExpr(SS, NameInfo, Var, |
| 4859 | /*FoundD=*/nullptr, TemplateArgs); |
| 4860 | } |
| 4861 | |
| 4862 | void Sema::diagnoseMissingTemplateArguments(TemplateName Name, |
| 4863 | SourceLocation Loc) { |
| 4864 | Diag(Loc, diag::err_template_missing_args) |
| 4865 | << (int)getTemplateNameKindForDiagnostics(Name) << Name; |
| 4866 | if (TemplateDecl *TD = Name.getAsTemplateDecl()) { |
| 4867 | Diag(TD->getLocation(), diag::note_template_decl_here) |
| 4868 | << TD->getTemplateParameters()->getSourceRange(); |
| 4869 | } |
| 4870 | } |
| 4871 | |
| 4872 | ExprResult |
| 4873 | Sema::CheckConceptTemplateId(const CXXScopeSpec &SS, |
| 4874 | SourceLocation TemplateKWLoc, |
| 4875 | const DeclarationNameInfo &ConceptNameInfo, |
| 4876 | NamedDecl *FoundDecl, |
| 4877 | ConceptDecl *NamedConcept, |
| 4878 | const TemplateArgumentListInfo *TemplateArgs) { |
| 4879 | assert(NamedConcept && "A concept template id without a template?")(static_cast <bool> (NamedConcept && "A concept template id without a template?" ) ? void (0) : __assert_fail ("NamedConcept && \"A concept template id without a template?\"" , "clang/lib/Sema/SemaTemplate.cpp", 4879, __extension__ __PRETTY_FUNCTION__ )); |
| 4880 | |
| 4881 | llvm::SmallVector<TemplateArgument, 4> SugaredConverted, CanonicalConverted; |
| 4882 | if (CheckTemplateArgumentList( |
| 4883 | NamedConcept, ConceptNameInfo.getLoc(), |
| 4884 | const_cast<TemplateArgumentListInfo &>(*TemplateArgs), |
| 4885 | /*PartialTemplateArgs=*/false, SugaredConverted, CanonicalConverted, |
| 4886 | /*UpdateArgsWithConversions=*/false)) |
| 4887 | return ExprError(); |
| 4888 | |
| 4889 | auto *CSD = ImplicitConceptSpecializationDecl::Create( |
| 4890 | Context, NamedConcept->getDeclContext(), NamedConcept->getLocation(), |
| 4891 | CanonicalConverted); |
| 4892 | ConstraintSatisfaction Satisfaction; |
| 4893 | bool AreArgsDependent = |
| 4894 | TemplateSpecializationType::anyDependentTemplateArguments( |
| 4895 | *TemplateArgs, CanonicalConverted); |
| 4896 | MultiLevelTemplateArgumentList MLTAL(NamedConcept, CanonicalConverted, |
| 4897 | /*Final=*/false); |
| 4898 | LocalInstantiationScope Scope(*this); |
| 4899 | |
| 4900 | EnterExpressionEvaluationContext EECtx{ |
| 4901 | *this, ExpressionEvaluationContext::ConstantEvaluated, CSD}; |
| 4902 | |
| 4903 | if (!AreArgsDependent && |
| 4904 | CheckConstraintSatisfaction( |
| 4905 | NamedConcept, {NamedConcept->getConstraintExpr()}, MLTAL, |
| 4906 | SourceRange(SS.isSet() ? SS.getBeginLoc() : ConceptNameInfo.getLoc(), |
| 4907 | TemplateArgs->getRAngleLoc()), |
| 4908 | Satisfaction)) |
| 4909 | return ExprError(); |
| 4910 | |
| 4911 | return ConceptSpecializationExpr::Create( |
| 4912 | Context, |
| 4913 | SS.isSet() ? SS.getWithLocInContext(Context) : NestedNameSpecifierLoc{}, |
| 4914 | TemplateKWLoc, ConceptNameInfo, FoundDecl, NamedConcept, |
| 4915 | ASTTemplateArgumentListInfo::Create(Context, *TemplateArgs), CSD, |
| 4916 | AreArgsDependent ? nullptr : &Satisfaction); |
| 4917 | } |
| 4918 | |
| 4919 | ExprResult Sema::BuildTemplateIdExpr(const CXXScopeSpec &SS, |
| 4920 | SourceLocation TemplateKWLoc, |
| 4921 | LookupResult &R, |
| 4922 | bool RequiresADL, |
| 4923 | const TemplateArgumentListInfo *TemplateArgs) { |
| 4924 | // FIXME: Can we do any checking at this point? I guess we could check the |
| 4925 | // template arguments that we have against the template name, if the template |
| 4926 | // name refers to a single template. That's not a terribly common case, |
| 4927 | // though. |
| 4928 | // foo<int> could identify a single function unambiguously |
| 4929 | // This approach does NOT work, since f<int>(1); |
| 4930 | // gets resolved prior to resorting to overload resolution |
| 4931 | // i.e., template<class T> void f(double); |
| 4932 | // vs template<class T, class U> void f(U); |
| 4933 | |
| 4934 | // These should be filtered out by our callers. |
| 4935 | assert(!R.isAmbiguous() && "ambiguous lookup when building templateid")(static_cast <bool> (!R.isAmbiguous() && "ambiguous lookup when building templateid" ) ? void (0) : __assert_fail ("!R.isAmbiguous() && \"ambiguous lookup when building templateid\"" , "clang/lib/Sema/SemaTemplate.cpp", 4935, __extension__ __PRETTY_FUNCTION__ )); |
| 4936 | |
| 4937 | // Non-function templates require a template argument list. |
| 4938 | if (auto *TD = R.getAsSingle<TemplateDecl>()) { |
| 4939 | if (!TemplateArgs && !isa<FunctionTemplateDecl>(TD)) { |
| 4940 | diagnoseMissingTemplateArguments(TemplateName(TD), R.getNameLoc()); |
| 4941 | return ExprError(); |
| 4942 | } |
| 4943 | } |
| 4944 | |
| 4945 | // In C++1y, check variable template ids. |
| 4946 | if (R.getAsSingle<VarTemplateDecl>()) { |
| 4947 | ExprResult Res = CheckVarTemplateId(SS, R.getLookupNameInfo(), |
| 4948 | R.getAsSingle<VarTemplateDecl>(), |
| 4949 | TemplateKWLoc, TemplateArgs); |
| 4950 | if (Res.isInvalid() || Res.isUsable()) |
| 4951 | return Res; |
| 4952 | // Result is dependent. Carry on to build an UnresolvedLookupEpxr. |
| 4953 | } |
| 4954 | |
| 4955 | if (R.getAsSingle<ConceptDecl>()) { |
| 4956 | return CheckConceptTemplateId(SS, TemplateKWLoc, R.getLookupNameInfo(), |
| 4957 | R.getFoundDecl(), |
| 4958 | R.getAsSingle<ConceptDecl>(), TemplateArgs); |
| 4959 | } |
| 4960 | |
| 4961 | // We don't want lookup warnings at this point. |
| 4962 | R.suppressDiagnostics(); |
| 4963 | |
| 4964 | UnresolvedLookupExpr *ULE |
| 4965 | = UnresolvedLookupExpr::Create(Context, R.getNamingClass(), |
| 4966 | SS.getWithLocInContext(Context), |
| 4967 | TemplateKWLoc, |
| 4968 | R.getLookupNameInfo(), |
| 4969 | RequiresADL, TemplateArgs, |
| 4970 | R.begin(), R.end()); |
| 4971 | |
| 4972 | return ULE; |
| 4973 | } |
| 4974 | |
| 4975 | // We actually only call this from template instantiation. |
| 4976 | ExprResult |
| 4977 | Sema::BuildQualifiedTemplateIdExpr(CXXScopeSpec &SS, |
| 4978 | SourceLocation TemplateKWLoc, |
| 4979 | const DeclarationNameInfo &NameInfo, |
| 4980 | const TemplateArgumentListInfo *TemplateArgs) { |
| 4981 | |
| 4982 | assert(TemplateArgs || TemplateKWLoc.isValid())(static_cast <bool> (TemplateArgs || TemplateKWLoc.isValid ()) ? void (0) : __assert_fail ("TemplateArgs || TemplateKWLoc.isValid()" , "clang/lib/Sema/SemaTemplate.cpp", 4982, __extension__ __PRETTY_FUNCTION__ )); |
| 4983 | DeclContext *DC; |
| 4984 | if (!(DC = computeDeclContext(SS, false)) || |
| 4985 | DC->isDependentContext() || |
| 4986 | RequireCompleteDeclContext(SS, DC)) |
| 4987 | return BuildDependentDeclRefExpr(SS, TemplateKWLoc, NameInfo, TemplateArgs); |
| 4988 | |
| 4989 | bool MemberOfUnknownSpecialization; |
| 4990 | LookupResult R(*this, NameInfo, LookupOrdinaryName); |
| 4991 | if (LookupTemplateName(R, (Scope *)nullptr, SS, QualType(), |
| 4992 | /*Entering*/false, MemberOfUnknownSpecialization, |
| 4993 | TemplateKWLoc)) |
| 4994 | return ExprError(); |
| 4995 | |
| 4996 | if (R.isAmbiguous()) |
| 4997 | return ExprError(); |
| 4998 | |
| 4999 | if (R.empty()) { |
| 5000 | Diag(NameInfo.getLoc(), diag::err_no_member) |
| 5001 | << NameInfo.getName() << DC << SS.getRange(); |
| 5002 | return ExprError(); |
| 5003 | } |
| 5004 | |
| 5005 | if (ClassTemplateDecl *Temp = R.getAsSingle<ClassTemplateDecl>()) { |
| 5006 | Diag(NameInfo.getLoc(), diag::err_template_kw_refers_to_class_template) |
| 5007 | << SS.getScopeRep() |
| 5008 | << NameInfo.getName().getAsString() << SS.getRange(); |
| 5009 | Diag(Temp->getLocation(), diag::note_referenced_class_template); |
| 5010 | return ExprError(); |
| 5011 | } |
| 5012 | |
| 5013 | return BuildTemplateIdExpr(SS, TemplateKWLoc, R, /*ADL*/ false, TemplateArgs); |
| 5014 | } |
| 5015 | |
| 5016 | /// Form a template name from a name that is syntactically required to name a |
| 5017 | /// template, either due to use of the 'template' keyword or because a name in |
| 5018 | /// this syntactic context is assumed to name a template (C++ [temp.names]p2-4). |
| 5019 | /// |
| 5020 | /// This action forms a template name given the name of the template and its |
| 5021 | /// optional scope specifier. This is used when the 'template' keyword is used |
| 5022 | /// or when the parsing context unambiguously treats a following '<' as |
| 5023 | /// introducing a template argument list. Note that this may produce a |
| 5024 | /// non-dependent template name if we can perform the lookup now and identify |
| 5025 | /// the named template. |
| 5026 | /// |
| 5027 | /// For example, given "x.MetaFun::template apply", the scope specifier |
| 5028 | /// \p SS will be "MetaFun::", \p TemplateKWLoc contains the location |
| 5029 | /// of the "template" keyword, and "apply" is the \p Name. |
| 5030 | TemplateNameKind Sema::ActOnTemplateName(Scope *S, |
| 5031 | CXXScopeSpec &SS, |
| 5032 | SourceLocation TemplateKWLoc, |
| 5033 | const UnqualifiedId &Name, |
| 5034 | ParsedType ObjectType, |
| 5035 | bool EnteringContext, |
| 5036 | TemplateTy &Result, |
| 5037 | bool AllowInjectedClassName) { |
| 5038 | if (TemplateKWLoc.isValid() && S && !S->getTemplateParamParent()) |
| 5039 | Diag(TemplateKWLoc, |
| 5040 | getLangOpts().CPlusPlus11 ? |
| 5041 | diag::warn_cxx98_compat_template_outside_of_template : |
| 5042 | diag::ext_template_outside_of_template) |
| 5043 | << FixItHint::CreateRemoval(TemplateKWLoc); |
| 5044 | |
| 5045 | if (SS.isInvalid()) |
| 5046 | return TNK_Non_template; |
| 5047 | |
| 5048 | // Figure out where isTemplateName is going to look. |
| 5049 | DeclContext *LookupCtx = nullptr; |
| 5050 | if (SS.isNotEmpty()) |
| 5051 | LookupCtx = computeDeclContext(SS, EnteringContext); |
| 5052 | else if (ObjectType) |
| 5053 | LookupCtx = computeDeclContext(GetTypeFromParser(ObjectType)); |
| 5054 | |
| 5055 | // C++0x [temp.names]p5: |
| 5056 | // If a name prefixed by the keyword template is not the name of |
| 5057 | // a template, the program is ill-formed. [Note: the keyword |
| 5058 | // template may not be applied to non-template members of class |
| 5059 | // templates. -end note ] [ Note: as is the case with the |
| 5060 | // typename prefix, the template prefix is allowed in cases |
| 5061 | // where it is not strictly necessary; i.e., when the |
| 5062 | // nested-name-specifier or the expression on the left of the -> |
| 5063 | // or . is not dependent on a template-parameter, or the use |
| 5064 | // does not appear in the scope of a template. -end note] |
| 5065 | // |
| 5066 | // Note: C++03 was more strict here, because it banned the use of |
| 5067 | // the "template" keyword prior to a template-name that was not a |
| 5068 | // dependent name. C++ DR468 relaxed this requirement (the |
| 5069 | // "template" keyword is now permitted). We follow the C++0x |
| 5070 | // rules, even in C++03 mode with a warning, retroactively applying the DR. |
| 5071 | bool MemberOfUnknownSpecialization; |
| 5072 | TemplateNameKind TNK = isTemplateName(S, SS, TemplateKWLoc.isValid(), Name, |
| 5073 | ObjectType, EnteringContext, Result, |
| 5074 | MemberOfUnknownSpecialization); |
| 5075 | if (TNK != TNK_Non_template) { |
| 5076 | // We resolved this to a (non-dependent) template name. Return it. |
| 5077 | auto *LookupRD = dyn_cast_or_null<CXXRecordDecl>(LookupCtx); |
| 5078 | if (!AllowInjectedClassName && SS.isNotEmpty() && LookupRD && |
| 5079 | Name.getKind() == UnqualifiedIdKind::IK_Identifier && |
| 5080 | Name.Identifier && LookupRD->getIdentifier() == Name.Identifier) { |
| 5081 | // C++14 [class.qual]p2: |
| 5082 | // In a lookup in which function names are not ignored and the |
| 5083 | // nested-name-specifier nominates a class C, if the name specified |
| 5084 | // [...] is the injected-class-name of C, [...] the name is instead |
| 5085 | // considered to name the constructor |
| 5086 | // |
| 5087 | // We don't get here if naming the constructor would be valid, so we |
| 5088 | // just reject immediately and recover by treating the |
| 5089 | // injected-class-name as naming the template. |
| 5090 | Diag(Name.getBeginLoc(), |
| 5091 | diag::ext_out_of_line_qualified_id_type_names_constructor) |
| 5092 | << Name.Identifier |
| 5093 | << 0 /*injected-class-name used as template name*/ |
| 5094 | << TemplateKWLoc.isValid(); |
| 5095 | } |
| 5096 | return TNK; |
| 5097 | } |
| 5098 | |
| 5099 | if (!MemberOfUnknownSpecialization) { |
| 5100 | // Didn't find a template name, and the lookup wasn't dependent. |
| 5101 | // Do the lookup again to determine if this is a "nothing found" case or |
| 5102 | // a "not a template" case. FIXME: Refactor isTemplateName so we don't |
| 5103 | // need to do this. |
| 5104 | DeclarationNameInfo DNI = GetNameFromUnqualifiedId(Name); |
| 5105 | LookupResult R(*this, DNI.getName(), Name.getBeginLoc(), |
| 5106 | LookupOrdinaryName); |
| 5107 | bool MOUS; |
| 5108 | // Tell LookupTemplateName that we require a template so that it diagnoses |
| 5109 | // cases where it finds a non-template. |
| 5110 | RequiredTemplateKind RTK = TemplateKWLoc.isValid() |
| 5111 | ? RequiredTemplateKind(TemplateKWLoc) |
| 5112 | : TemplateNameIsRequired; |
| 5113 | if (!LookupTemplateName(R, S, SS, ObjectType.get(), EnteringContext, MOUS, |
| 5114 | RTK, nullptr, /*AllowTypoCorrection=*/false) && |
| 5115 | !R.isAmbiguous()) { |
| 5116 | if (LookupCtx) |
| 5117 | Diag(Name.getBeginLoc(), diag::err_no_member) |
| 5118 | << DNI.getName() << LookupCtx << SS.getRange(); |
| 5119 | else |
| 5120 | Diag(Name.getBeginLoc(), diag::err_undeclared_use) |
| 5121 | << DNI.getName() << SS.getRange(); |
| 5122 | } |
| 5123 | return TNK_Non_template; |
| 5124 | } |
| 5125 | |
| 5126 | NestedNameSpecifier *Qualifier = SS.getScopeRep(); |
| 5127 | |
| 5128 | switch (Name.getKind()) { |
| 5129 | case UnqualifiedIdKind::IK_Identifier: |
| 5130 | Result = TemplateTy::make( |
| 5131 | Context.getDependentTemplateName(Qualifier, Name.Identifier)); |
| 5132 | return TNK_Dependent_template_name; |
| 5133 | |
| 5134 | case UnqualifiedIdKind::IK_OperatorFunctionId: |
| 5135 | Result = TemplateTy::make(Context.getDependentTemplateName( |
| 5136 | Qualifier, Name.OperatorFunctionId.Operator)); |
| 5137 | return TNK_Function_template; |
| 5138 | |
| 5139 | case UnqualifiedIdKind::IK_LiteralOperatorId: |
| 5140 | // This is a kind of template name, but can never occur in a dependent |
| 5141 | // scope (literal operators can only be declared at namespace scope). |
| 5142 | break; |
| 5143 | |
| 5144 | default: |
| 5145 | break; |
| 5146 | } |
| 5147 | |
| 5148 | // This name cannot possibly name a dependent template. Diagnose this now |
| 5149 | // rather than building a dependent template name that can never be valid. |
| 5150 | Diag(Name.getBeginLoc(), |
| 5151 | diag::err_template_kw_refers_to_dependent_non_template) |
| 5152 | << GetNameFromUnqualifiedId(Name).getName() << Name.getSourceRange() |
| 5153 | << TemplateKWLoc.isValid() << TemplateKWLoc; |
| 5154 | return TNK_Non_template; |
| 5155 | } |
| 5156 | |
| 5157 | bool Sema::CheckTemplateTypeArgument( |
| 5158 | TemplateTypeParmDecl *Param, TemplateArgumentLoc &AL, |
| 5159 | SmallVectorImpl<TemplateArgument> &SugaredConverted, |
| 5160 | SmallVectorImpl<TemplateArgument> &CanonicalConverted) { |
| 5161 | const TemplateArgument &Arg = AL.getArgument(); |
| 5162 | QualType ArgType; |
| 5163 | TypeSourceInfo *TSI = nullptr; |
| 5164 | |
| 5165 | // Check template type parameter. |
| 5166 | switch(Arg.getKind()) { |
| 5167 | case TemplateArgument::Type: |
| 5168 | // C++ [temp.arg.type]p1: |
| 5169 | // A template-argument for a template-parameter which is a |
| 5170 | // type shall be a type-id. |
| 5171 | ArgType = Arg.getAsType(); |
| 5172 | TSI = AL.getTypeSourceInfo(); |
| 5173 | break; |
| 5174 | case TemplateArgument::Template: |
| 5175 | case TemplateArgument::TemplateExpansion: { |
| 5176 | // We have a template type parameter but the template argument |
| 5177 | // is a template without any arguments. |
| 5178 | SourceRange SR = AL.getSourceRange(); |
| 5179 | TemplateName Name = Arg.getAsTemplateOrTemplatePattern(); |
| 5180 | diagnoseMissingTemplateArguments(Name, SR.getEnd()); |
| 5181 | return true; |
| 5182 | } |
| 5183 | case TemplateArgument::Expression: { |
| 5184 | // We have a template type parameter but the template argument is an |
| 5185 | // expression; see if maybe it is missing the "typename" keyword. |
| 5186 | CXXScopeSpec SS; |
| 5187 | DeclarationNameInfo NameInfo; |
| 5188 | |
| 5189 | if (DependentScopeDeclRefExpr *ArgExpr = |
| 5190 | dyn_cast<DependentScopeDeclRefExpr>(Arg.getAsExpr())) { |
| 5191 | SS.Adopt(ArgExpr->getQualifierLoc()); |
| 5192 | NameInfo = ArgExpr->getNameInfo(); |
| 5193 | } else if (CXXDependentScopeMemberExpr *ArgExpr = |
| 5194 | dyn_cast<CXXDependentScopeMemberExpr>(Arg.getAsExpr())) { |
| 5195 | if (ArgExpr->isImplicitAccess()) { |
| 5196 | SS.Adopt(ArgExpr->getQualifierLoc()); |
| 5197 | NameInfo = ArgExpr->getMemberNameInfo(); |
| 5198 | } |
| 5199 | } |
| 5200 | |
| 5201 | if (auto *II = NameInfo.getName().getAsIdentifierInfo()) { |
| 5202 | LookupResult Result(*this, NameInfo, LookupOrdinaryName); |
| 5203 | LookupParsedName(Result, CurScope, &SS); |
| 5204 | |
| 5205 | if (Result.getAsSingle<TypeDecl>() || |
| 5206 | Result.getResultKind() == |
| 5207 | LookupResult::NotFoundInCurrentInstantiation) { |
| 5208 | assert(SS.getScopeRep() && "dependent scope expr must has a scope!")(static_cast <bool> (SS.getScopeRep() && "dependent scope expr must has a scope!" ) ? void (0) : __assert_fail ("SS.getScopeRep() && \"dependent scope expr must has a scope!\"" , "clang/lib/Sema/SemaTemplate.cpp", 5208, __extension__ __PRETTY_FUNCTION__ )); |
| 5209 | // Suggest that the user add 'typename' before the NNS. |
| 5210 | SourceLocation Loc = AL.getSourceRange().getBegin(); |
| 5211 | Diag(Loc, getLangOpts().MSVCCompat |
| 5212 | ? diag::ext_ms_template_type_arg_missing_typename |
| 5213 | : diag::err_template_arg_must_be_type_suggest) |
| 5214 | << FixItHint::CreateInsertion(Loc, "typename "); |
| 5215 | Diag(Param->getLocation(), diag::note_template_param_here); |
| 5216 | |
| 5217 | // Recover by synthesizing a type using the location information that we |
| 5218 | // already have. |
| 5219 | ArgType = |
| 5220 | Context.getDependentNameType(ETK_Typename, SS.getScopeRep(), II); |
| 5221 | TypeLocBuilder TLB; |
| 5222 | DependentNameTypeLoc TL = TLB.push<DependentNameTypeLoc>(ArgType); |
| 5223 | TL.setElaboratedKeywordLoc(SourceLocation(/*synthesized*/)); |
| 5224 | TL.setQualifierLoc(SS.getWithLocInContext(Context)); |
| 5225 | TL.setNameLoc(NameInfo.getLoc()); |
| 5226 | TSI = TLB.getTypeSourceInfo(Context, ArgType); |
| 5227 | |
| 5228 | // Overwrite our input TemplateArgumentLoc so that we can recover |
| 5229 | // properly. |
| 5230 | AL = TemplateArgumentLoc(TemplateArgument(ArgType), |
| 5231 | TemplateArgumentLocInfo(TSI)); |
| 5232 | |
| 5233 | break; |
| 5234 | } |
| 5235 | } |
| 5236 | // fallthrough |
| 5237 | [[fallthrough]]; |
| 5238 | } |
| 5239 | default: { |
| 5240 | // We have a template type parameter but the template argument |
| 5241 | // is not a type. |
| 5242 | SourceRange SR = AL.getSourceRange(); |
| 5243 | Diag(SR.getBegin(), diag::err_template_arg_must_be_type) << SR; |
| 5244 | Diag(Param->getLocation(), diag::note_template_param_here); |
| 5245 | |
| 5246 | return true; |
| 5247 | } |
| 5248 | } |
| 5249 | |
| 5250 | if (CheckTemplateArgument(TSI)) |
| 5251 | return true; |
| 5252 | |
| 5253 | // Objective-C ARC: |
| 5254 | // If an explicitly-specified template argument type is a lifetime type |
| 5255 | // with no lifetime qualifier, the __strong lifetime qualifier is inferred. |
| 5256 | if (getLangOpts().ObjCAutoRefCount && |
| 5257 | ArgType->isObjCLifetimeType() && |
| 5258 | !ArgType.getObjCLifetime()) { |
| 5259 | Qualifiers Qs; |
| 5260 | Qs.setObjCLifetime(Qualifiers::OCL_Strong); |
| 5261 | ArgType = Context.getQualifiedType(ArgType, Qs); |
| 5262 | } |
| 5263 | |
| 5264 | SugaredConverted.push_back(TemplateArgument(ArgType)); |
| 5265 | CanonicalConverted.push_back( |
| 5266 | TemplateArgument(Context.getCanonicalType(ArgType))); |
| 5267 | return false; |
| 5268 | } |
| 5269 | |
| 5270 | /// Substitute template arguments into the default template argument for |
| 5271 | /// the given template type parameter. |
| 5272 | /// |
| 5273 | /// \param SemaRef the semantic analysis object for which we are performing |
| 5274 | /// the substitution. |
| 5275 | /// |
| 5276 | /// \param Template the template that we are synthesizing template arguments |
| 5277 | /// for. |
| 5278 | /// |
| 5279 | /// \param TemplateLoc the location of the template name that started the |
| 5280 | /// template-id we are checking. |
| 5281 | /// |
| 5282 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
| 5283 | /// terminates the template-id. |
| 5284 | /// |
| 5285 | /// \param Param the template template parameter whose default we are |
| 5286 | /// substituting into. |
| 5287 | /// |
| 5288 | /// \param Converted the list of template arguments provided for template |
| 5289 | /// parameters that precede \p Param in the template parameter list. |
| 5290 | /// \returns the substituted template argument, or NULL if an error occurred. |
| 5291 | static TypeSourceInfo *SubstDefaultTemplateArgument( |
| 5292 | Sema &SemaRef, TemplateDecl *Template, SourceLocation TemplateLoc, |
| 5293 | SourceLocation RAngleLoc, TemplateTypeParmDecl *Param, |
| 5294 | ArrayRef<TemplateArgument> SugaredConverted, |
| 5295 | ArrayRef<TemplateArgument> CanonicalConverted) { |
| 5296 | TypeSourceInfo *ArgType = Param->getDefaultArgumentInfo(); |
| 5297 | |
| 5298 | // If the argument type is dependent, instantiate it now based |
| 5299 | // on the previously-computed template arguments. |
| 5300 | if (ArgType->getType()->isInstantiationDependentType()) { |
| 5301 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, Param, Template, |
| 5302 | SugaredConverted, |
| 5303 | SourceRange(TemplateLoc, RAngleLoc)); |
| 5304 | if (Inst.isInvalid()) |
| 5305 | return nullptr; |
| 5306 | |
| 5307 | // Only substitute for the innermost template argument list. |
| 5308 | MultiLevelTemplateArgumentList TemplateArgLists(Template, SugaredConverted, |
| 5309 | /*Final=*/true); |
| 5310 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
| 5311 | TemplateArgLists.addOuterTemplateArguments(std::nullopt); |
| 5312 | |
| 5313 | bool ForLambdaCallOperator = false; |
| 5314 | if (const auto *Rec = dyn_cast<CXXRecordDecl>(Template->getDeclContext())) |
| 5315 | ForLambdaCallOperator = Rec->isLambda(); |
| 5316 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext(), |
| 5317 | !ForLambdaCallOperator); |
| 5318 | ArgType = |
| 5319 | SemaRef.SubstType(ArgType, TemplateArgLists, |
| 5320 | Param->getDefaultArgumentLoc(), Param->getDeclName()); |
| 5321 | } |
| 5322 | |
| 5323 | return ArgType; |
| 5324 | } |
| 5325 | |
| 5326 | /// Substitute template arguments into the default template argument for |
| 5327 | /// the given non-type template parameter. |
| 5328 | /// |
| 5329 | /// \param SemaRef the semantic analysis object for which we are performing |
| 5330 | /// the substitution. |
| 5331 | /// |
| 5332 | /// \param Template the template that we are synthesizing template arguments |
| 5333 | /// for. |
| 5334 | /// |
| 5335 | /// \param TemplateLoc the location of the template name that started the |
| 5336 | /// template-id we are checking. |
| 5337 | /// |
| 5338 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
| 5339 | /// terminates the template-id. |
| 5340 | /// |
| 5341 | /// \param Param the non-type template parameter whose default we are |
| 5342 | /// substituting into. |
| 5343 | /// |
| 5344 | /// \param Converted the list of template arguments provided for template |
| 5345 | /// parameters that precede \p Param in the template parameter list. |
| 5346 | /// |
| 5347 | /// \returns the substituted template argument, or NULL if an error occurred. |
| 5348 | static ExprResult SubstDefaultTemplateArgument( |
| 5349 | Sema &SemaRef, TemplateDecl *Template, SourceLocation TemplateLoc, |
| 5350 | SourceLocation RAngleLoc, NonTypeTemplateParmDecl *Param, |
| 5351 | ArrayRef<TemplateArgument> SugaredConverted, |
| 5352 | ArrayRef<TemplateArgument> CanonicalConverted) { |
| 5353 | Sema::InstantiatingTemplate Inst(SemaRef, TemplateLoc, Param, Template, |
| 5354 | SugaredConverted, |
| 5355 | SourceRange(TemplateLoc, RAngleLoc)); |
| 5356 | if (Inst.isInvalid()) |
| 5357 | return ExprError(); |
| 5358 | |
| 5359 | // Only substitute for the innermost template argument list. |
| 5360 | MultiLevelTemplateArgumentList TemplateArgLists(Template, SugaredConverted, |
| 5361 | /*Final=*/true); |
| 5362 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
| 5363 | TemplateArgLists.addOuterTemplateArguments(std::nullopt); |
| 5364 | |
| 5365 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); |
| 5366 | EnterExpressionEvaluationContext ConstantEvaluated( |
| 5367 | SemaRef, Sema::ExpressionEvaluationContext::ConstantEvaluated); |
| 5368 | return SemaRef.SubstExpr(Param->getDefaultArgument(), TemplateArgLists); |
| 5369 | } |
| 5370 | |
| 5371 | /// Substitute template arguments into the default template argument for |
| 5372 | /// the given template template parameter. |
| 5373 | /// |
| 5374 | /// \param SemaRef the semantic analysis object for which we are performing |
| 5375 | /// the substitution. |
| 5376 | /// |
| 5377 | /// \param Template the template that we are synthesizing template arguments |
| 5378 | /// for. |
| 5379 | /// |
| 5380 | /// \param TemplateLoc the location of the template name that started the |
| 5381 | /// template-id we are checking. |
| 5382 | /// |
| 5383 | /// \param RAngleLoc the location of the right angle bracket ('>') that |
| 5384 | /// terminates the template-id. |
| 5385 | /// |
| 5386 | /// \param Param the template template parameter whose default we are |
| 5387 | /// substituting into. |
| 5388 | /// |
| 5389 | /// \param Converted the list of template arguments provided for template |
| 5390 | /// parameters that precede \p Param in the template parameter list. |
| 5391 | /// |
| 5392 | /// \param QualifierLoc Will be set to the nested-name-specifier (with |
| 5393 | /// source-location information) that precedes the template name. |
| 5394 | /// |
| 5395 | /// \returns the substituted template argument, or NULL if an error occurred. |
| 5396 | static TemplateName SubstDefaultTemplateArgument( |
| 5397 | Sema &SemaRef, TemplateDecl *Template, SourceLocation TemplateLoc, |
| 5398 | SourceLocation RAngleLoc, TemplateTemplateParmDecl *Param, |
| 5399 | ArrayRef<TemplateArgument> SugaredConverted, |
| 5400 | ArrayRef<TemplateArgument> CanonicalConverted, |
| 5401 | NestedNameSpecifierLoc &QualifierLoc) { |
| 5402 | Sema::InstantiatingTemplate Inst( |
| 5403 | SemaRef, TemplateLoc, TemplateParameter(Param), Template, |
| 5404 | SugaredConverted, SourceRange(TemplateLoc, RAngleLoc)); |
| 5405 | if (Inst.isInvalid()) |
| 5406 | return TemplateName(); |
| 5407 | |
| 5408 | // Only substitute for the innermost template argument list. |
| 5409 | MultiLevelTemplateArgumentList TemplateArgLists(Template, SugaredConverted, |
| 5410 | /*Final=*/true); |
| 5411 | for (unsigned i = 0, e = Param->getDepth(); i != e; ++i) |
| 5412 | TemplateArgLists.addOuterTemplateArguments(std::nullopt); |
| 5413 | |
| 5414 | Sema::ContextRAII SavedContext(SemaRef, Template->getDeclContext()); |
| 5415 | // Substitute into the nested-name-specifier first, |
| 5416 | QualifierLoc = Param->getDefaultArgument().getTemplateQualifierLoc(); |
| 5417 | if (QualifierLoc) { |
| 5418 | QualifierLoc = |
| 5419 | SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgLists); |
| 5420 | if (!QualifierLoc) |
| 5421 | return TemplateName(); |
| 5422 | } |
| 5423 | |
| 5424 | return SemaRef.SubstTemplateName( |
| 5425 | QualifierLoc, |
| 5426 | Param->getDefaultArgument().getArgument().getAsTemplate(), |
| 5427 | Param->getDefaultArgument().getTemplateNameLoc(), |
| 5428 | TemplateArgLists); |
| 5429 | } |
| 5430 | |
| 5431 | /// If the given template parameter has a default template |
| 5432 | /// argument, substitute into that default template argument and |
| 5433 | /// return the corresponding template argument. |
| 5434 | TemplateArgumentLoc Sema::SubstDefaultTemplateArgumentIfAvailable( |
| 5435 | TemplateDecl *Template, SourceLocation TemplateLoc, |
| 5436 | SourceLocation RAngleLoc, Decl *Param, |
| 5437 | ArrayRef<TemplateArgument> SugaredConverted, |
| 5438 | ArrayRef<TemplateArgument> CanonicalConverted, bool &HasDefaultArg) { |
| 5439 | HasDefaultArg = false; |
| 5440 | |
| 5441 | if (TemplateTypeParmDecl *TypeParm = dyn_cast<TemplateTypeParmDecl>(Param)) { |
| 5442 | if (!hasReachableDefaultArgument(TypeParm)) |
| 5443 | return TemplateArgumentLoc(); |
| 5444 | |
| 5445 | HasDefaultArg = true; |
| 5446 | TypeSourceInfo *DI = SubstDefaultTemplateArgument( |
| 5447 | *this, Template, TemplateLoc, RAngleLoc, TypeParm, SugaredConverted, |
| 5448 | CanonicalConverted); |
| 5449 | if (DI) |
| 5450 | return TemplateArgumentLoc(TemplateArgument(DI->getType()), DI); |
| 5451 | |
| 5452 | return TemplateArgumentLoc(); |
| 5453 | } |
| 5454 | |
| 5455 | if (NonTypeTemplateParmDecl *NonTypeParm |
| 5456 | = dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
| 5457 | if (!hasReachableDefaultArgument(NonTypeParm)) |
| 5458 | return TemplateArgumentLoc(); |
| 5459 | |
| 5460 | HasDefaultArg = true; |
| 5461 | ExprResult Arg = SubstDefaultTemplateArgument( |
| 5462 | *this, Template, TemplateLoc, RAngleLoc, NonTypeParm, SugaredConverted, |
| 5463 | CanonicalConverted); |
| 5464 | if (Arg.isInvalid()) |
| 5465 | return TemplateArgumentLoc(); |
| 5466 | |
| 5467 | Expr *ArgE = Arg.getAs<Expr>(); |
| 5468 | return TemplateArgumentLoc(TemplateArgument(ArgE), ArgE); |
| 5469 | } |
| 5470 | |
| 5471 | TemplateTemplateParmDecl *TempTempParm |
| 5472 | = cast<TemplateTemplateParmDecl>(Param); |
| 5473 | if (!hasReachableDefaultArgument(TempTempParm)) |
| 5474 | return TemplateArgumentLoc(); |
| 5475 | |
| 5476 | HasDefaultArg = true; |
| 5477 | NestedNameSpecifierLoc QualifierLoc; |
| 5478 | TemplateName TName = SubstDefaultTemplateArgument( |
| 5479 | *this, Template, TemplateLoc, RAngleLoc, TempTempParm, SugaredConverted, |
| 5480 | CanonicalConverted, QualifierLoc); |
| 5481 | if (TName.isNull()) |
| 5482 | return TemplateArgumentLoc(); |
| 5483 | |
| 5484 | return TemplateArgumentLoc( |
| 5485 | Context, TemplateArgument(TName), |
| 5486 | TempTempParm->getDefaultArgument().getTemplateQualifierLoc(), |
| 5487 | TempTempParm->getDefaultArgument().getTemplateNameLoc()); |
| 5488 | } |
| 5489 | |
| 5490 | /// Convert a template-argument that we parsed as a type into a template, if |
| 5491 | /// possible. C++ permits injected-class-names to perform dual service as |
| 5492 | /// template template arguments and as template type arguments. |
| 5493 | static TemplateArgumentLoc |
| 5494 | convertTypeTemplateArgumentToTemplate(ASTContext &Context, TypeLoc TLoc) { |
| 5495 | // Extract and step over any surrounding nested-name-specifier. |
| 5496 | NestedNameSpecifierLoc QualLoc; |
| 5497 | if (auto ETLoc = TLoc.getAs<ElaboratedTypeLoc>()) { |
| 5498 | if (ETLoc.getTypePtr()->getKeyword() != ETK_None) |
| 5499 | return TemplateArgumentLoc(); |
| 5500 | |
| 5501 | QualLoc = ETLoc.getQualifierLoc(); |
| 5502 | TLoc = ETLoc.getNamedTypeLoc(); |
| 5503 | } |
| 5504 | // If this type was written as an injected-class-name, it can be used as a |
| 5505 | // template template argument. |
| 5506 | if (auto InjLoc = TLoc.getAs<InjectedClassNameTypeLoc>()) |
| 5507 | return TemplateArgumentLoc(Context, InjLoc.getTypePtr()->getTemplateName(), |
| 5508 | QualLoc, InjLoc.getNameLoc()); |
| 5509 | |
| 5510 | // If this type was written as an injected-class-name, it may have been |
| 5511 | // converted to a RecordType during instantiation. If the RecordType is |
| 5512 | // *not* wrapped in a TemplateSpecializationType and denotes a class |
| 5513 | // template specialization, it must have come from an injected-class-name. |
| 5514 | if (auto RecLoc = TLoc.getAs<RecordTypeLoc>()) |
| 5515 | if (auto *CTSD = |
| 5516 | dyn_cast<ClassTemplateSpecializationDecl>(RecLoc.getDecl())) |
| 5517 | return TemplateArgumentLoc(Context, |
| 5518 | TemplateName(CTSD->getSpecializedTemplate()), |
| 5519 | QualLoc, RecLoc.getNameLoc()); |
| 5520 | |
| 5521 | return TemplateArgumentLoc(); |
| 5522 | } |
| 5523 | |
| 5524 | /// Check that the given template argument corresponds to the given |
| 5525 | /// template parameter. |
| 5526 | /// |
| 5527 | /// \param Param The template parameter against which the argument will be |
| 5528 | /// checked. |
| 5529 | /// |
| 5530 | /// \param Arg The template argument, which may be updated due to conversions. |
| 5531 | /// |
| 5532 | /// \param Template The template in which the template argument resides. |
| 5533 | /// |
| 5534 | /// \param TemplateLoc The location of the template name for the template |
| 5535 | /// whose argument list we're matching. |
| 5536 | /// |
| 5537 | /// \param RAngleLoc The location of the right angle bracket ('>') that closes |
| 5538 | /// the template argument list. |
| 5539 | /// |
| 5540 | /// \param ArgumentPackIndex The index into the argument pack where this |
| 5541 | /// argument will be placed. Only valid if the parameter is a parameter pack. |
| 5542 | /// |
| 5543 | /// \param Converted The checked, converted argument will be added to the |
| 5544 | /// end of this small vector. |
| 5545 | /// |
| 5546 | /// \param CTAK Describes how we arrived at this particular template argument: |
| 5547 | /// explicitly written, deduced, etc. |
| 5548 | /// |
| 5549 | /// \returns true on error, false otherwise. |
| 5550 | bool Sema::CheckTemplateArgument( |
| 5551 | NamedDecl *Param, TemplateArgumentLoc &Arg, NamedDecl *Template, |
| 5552 | SourceLocation TemplateLoc, SourceLocation RAngleLoc, |
| 5553 | unsigned ArgumentPackIndex, |
| 5554 | SmallVectorImpl<TemplateArgument> &SugaredConverted, |
| 5555 | SmallVectorImpl<TemplateArgument> &CanonicalConverted, |
| 5556 | CheckTemplateArgumentKind CTAK) { |
| 5557 | // Check template type parameters. |
| 5558 | if (TemplateTypeParmDecl *TTP = dyn_cast<TemplateTypeParmDecl>(Param)) |
| 5559 | return CheckTemplateTypeArgument(TTP, Arg, SugaredConverted, |
| 5560 | CanonicalConverted); |
| 5561 | |
| 5562 | // Check non-type template parameters. |
| 5563 | if (NonTypeTemplateParmDecl *NTTP =dyn_cast<NonTypeTemplateParmDecl>(Param)) { |
| 5564 | // Do substitution on the type of the non-type template parameter |
| 5565 | // with the template arguments we've seen thus far. But if the |
| 5566 | // template has a dependent context then we cannot substitute yet. |
| 5567 | QualType NTTPType = NTTP->getType(); |
| 5568 | if (NTTP->isParameterPack() && NTTP->isExpandedParameterPack()) |
| 5569 | NTTPType = NTTP->getExpansionType(ArgumentPackIndex); |
| 5570 | |
| 5571 | if (NTTPType->isInstantiationDependentType() && |
| 5572 | !isa<TemplateTemplateParmDecl>(Template) && |
| 5573 | !Template->getDeclContext()->isDependentContext()) { |
| 5574 | // Do substitution on the type of the non-type template parameter. |
| 5575 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, NTTP, |
| 5576 | SugaredConverted, |
| 5577 | SourceRange(TemplateLoc, RAngleLoc)); |
| 5578 | if (Inst.isInvalid()) |
| 5579 | return true; |
| 5580 | |
| 5581 | MultiLevelTemplateArgumentList MLTAL(Template, SugaredConverted, |
| 5582 | /*Final=*/true); |
| 5583 | // If the parameter is a pack expansion, expand this slice of the pack. |
| 5584 | if (auto *PET = NTTPType->getAs<PackExpansionType>()) { |
| 5585 | Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, |
| 5586 | ArgumentPackIndex); |
| 5587 | NTTPType = SubstType(PET->getPattern(), MLTAL, NTTP->getLocation(), |
| 5588 | NTTP->getDeclName()); |
| 5589 | } else { |
| 5590 | NTTPType = SubstType(NTTPType, MLTAL, NTTP->getLocation(), |
| 5591 | NTTP->getDeclName()); |
| 5592 | } |
| 5593 | |
| 5594 | // If that worked, check the non-type template parameter type |
| 5595 | // for validity. |
| 5596 | if (!NTTPType.isNull()) |
| 5597 | NTTPType = CheckNonTypeTemplateParameterType(NTTPType, |
| 5598 | NTTP->getLocation()); |
| 5599 | if (NTTPType.isNull()) |
| 5600 | return true; |
| 5601 | } |
| 5602 | |
| 5603 | switch (Arg.getArgument().getKind()) { |
| 5604 | case TemplateArgument::Null: |
| 5605 | llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here" , "clang/lib/Sema/SemaTemplate.cpp", 5605); |
| 5606 | |
| 5607 | case TemplateArgument::Expression: { |
| 5608 | Expr *E = Arg.getArgument().getAsExpr(); |
| 5609 | TemplateArgument SugaredResult, CanonicalResult; |
| 5610 | unsigned CurSFINAEErrors = NumSFINAEErrors; |
| 5611 | ExprResult Res = CheckTemplateArgument(NTTP, NTTPType, E, SugaredResult, |
| 5612 | CanonicalResult, CTAK); |
| 5613 | if (Res.isInvalid()) |
| 5614 | return true; |
| 5615 | // If the current template argument causes an error, give up now. |
| 5616 | if (CurSFINAEErrors < NumSFINAEErrors) |
| 5617 | return true; |
| 5618 | |
| 5619 | // If the resulting expression is new, then use it in place of the |
| 5620 | // old expression in the template argument. |
| 5621 | if (Res.get() != E) { |
| 5622 | TemplateArgument TA(Res.get()); |
| 5623 | Arg = TemplateArgumentLoc(TA, Res.get()); |
| 5624 | } |
| 5625 | |
| 5626 | SugaredConverted.push_back(SugaredResult); |
| 5627 | CanonicalConverted.push_back(CanonicalResult); |
| 5628 | break; |
| 5629 | } |
| 5630 | |
| 5631 | case TemplateArgument::Declaration: |
| 5632 | case TemplateArgument::Integral: |
| 5633 | case TemplateArgument::NullPtr: |
| 5634 | // We've already checked this template argument, so just copy |
| 5635 | // it to the list of converted arguments. |
| 5636 | SugaredConverted.push_back(Arg.getArgument()); |
| 5637 | CanonicalConverted.push_back( |
| 5638 | Context.getCanonicalTemplateArgument(Arg.getArgument())); |
| 5639 | break; |
| 5640 | |
| 5641 | case TemplateArgument::Template: |
| 5642 | case TemplateArgument::TemplateExpansion: |
| 5643 | // We were given a template template argument. It may not be ill-formed; |
| 5644 | // see below. |
| 5645 | if (DependentTemplateName *DTN |
| 5646 | = Arg.getArgument().getAsTemplateOrTemplatePattern() |
| 5647 | .getAsDependentTemplateName()) { |
| 5648 | // We have a template argument such as \c T::template X, which we |
| 5649 | // parsed as a template template argument. However, since we now |
| 5650 | // know that we need a non-type template argument, convert this |
| 5651 | // template name into an expression. |
| 5652 | |
| 5653 | DeclarationNameInfo NameInfo(DTN->getIdentifier(), |
| 5654 | Arg.getTemplateNameLoc()); |
| 5655 | |
| 5656 | CXXScopeSpec SS; |
| 5657 | SS.Adopt(Arg.getTemplateQualifierLoc()); |
| 5658 | // FIXME: the template-template arg was a DependentTemplateName, |
| 5659 | // so it was provided with a template keyword. However, its source |
| 5660 | // location is not stored in the template argument structure. |
| 5661 | SourceLocation TemplateKWLoc; |
| 5662 | ExprResult E = DependentScopeDeclRefExpr::Create( |
| 5663 | Context, SS.getWithLocInContext(Context), TemplateKWLoc, NameInfo, |
| 5664 | nullptr); |
| 5665 | |
| 5666 | // If we parsed the template argument as a pack expansion, create a |
| 5667 | // pack expansion expression. |
| 5668 | if (Arg.getArgument().getKind() == TemplateArgument::TemplateExpansion){ |
| 5669 | E = ActOnPackExpansion(E.get(), Arg.getTemplateEllipsisLoc()); |
| 5670 | if (E.isInvalid()) |
| 5671 | return true; |
| 5672 | } |
| 5673 | |
| 5674 | TemplateArgument SugaredResult, CanonicalResult; |
| 5675 | E = CheckTemplateArgument(NTTP, NTTPType, E.get(), SugaredResult, |
| 5676 | CanonicalResult, CTAK_Specified); |
| 5677 | if (E.isInvalid()) |
| 5678 | return true; |
| 5679 | |
| 5680 | SugaredConverted.push_back(SugaredResult); |
| 5681 | CanonicalConverted.push_back(CanonicalResult); |
| 5682 | break; |
| 5683 | } |
| 5684 | |
| 5685 | // We have a template argument that actually does refer to a class |
| 5686 | // template, alias template, or template template parameter, and |
| 5687 | // therefore cannot be a non-type template argument. |
| 5688 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_expr) |
| 5689 | << Arg.getSourceRange(); |
| 5690 | |
| 5691 | Diag(Param->getLocation(), diag::note_template_param_here); |
| 5692 | return true; |
| 5693 | |
| 5694 | case TemplateArgument::Type: { |
| 5695 | // We have a non-type template parameter but the template |
| 5696 | // argument is a type. |
| 5697 | |
| 5698 | // C++ [temp.arg]p2: |
| 5699 | // In a template-argument, an ambiguity between a type-id and |
| 5700 | // an expression is resolved to a type-id, regardless of the |
| 5701 | // form of the corresponding template-parameter. |
| 5702 | // |
| 5703 | // We warn specifically about this case, since it can be rather |
| 5704 | // confusing for users. |
| 5705 | QualType T = Arg.getArgument().getAsType(); |
| 5706 | SourceRange SR = Arg.getSourceRange(); |
| 5707 | if (T->isFunctionType()) |
| 5708 | Diag(SR.getBegin(), diag::err_template_arg_nontype_ambig) << SR << T; |
| 5709 | else |
| 5710 | Diag(SR.getBegin(), diag::err_template_arg_must_be_expr) << SR; |
| 5711 | Diag(Param->getLocation(), diag::note_template_param_here); |
| 5712 | return true; |
| 5713 | } |
| 5714 | |
| 5715 | case TemplateArgument::Pack: |
| 5716 | llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs" , "clang/lib/Sema/SemaTemplate.cpp", 5716); |
| 5717 | } |
| 5718 | |
| 5719 | return false; |
| 5720 | } |
| 5721 | |
| 5722 | |
| 5723 | // Check template template parameters. |
| 5724 | TemplateTemplateParmDecl *TempParm = cast<TemplateTemplateParmDecl>(Param); |
| 5725 | |
| 5726 | TemplateParameterList *Params = TempParm->getTemplateParameters(); |
| 5727 | if (TempParm->isExpandedParameterPack()) |
| 5728 | Params = TempParm->getExpansionTemplateParameters(ArgumentPackIndex); |
| 5729 | |
| 5730 | // Substitute into the template parameter list of the template |
| 5731 | // template parameter, since previously-supplied template arguments |
| 5732 | // may appear within the template template parameter. |
| 5733 | // |
| 5734 | // FIXME: Skip this if the parameters aren't instantiation-dependent. |
| 5735 | { |
| 5736 | // Set up a template instantiation context. |
| 5737 | LocalInstantiationScope Scope(*this); |
| 5738 | InstantiatingTemplate Inst(*this, TemplateLoc, Template, TempParm, |
| 5739 | SugaredConverted, |
| 5740 | SourceRange(TemplateLoc, RAngleLoc)); |
| 5741 | if (Inst.isInvalid()) |
| 5742 | return true; |
| 5743 | |
| 5744 | Params = |
| 5745 | SubstTemplateParams(Params, CurContext, |
| 5746 | MultiLevelTemplateArgumentList( |
| 5747 | Template, SugaredConverted, /*Final=*/true), |
| 5748 | /*EvaluateConstraints=*/false); |
| 5749 | if (!Params) |
| 5750 | return true; |
| 5751 | } |
| 5752 | |
| 5753 | // C++1z [temp.local]p1: (DR1004) |
| 5754 | // When [the injected-class-name] is used [...] as a template-argument for |
| 5755 | // a template template-parameter [...] it refers to the class template |
| 5756 | // itself. |
| 5757 | if (Arg.getArgument().getKind() == TemplateArgument::Type) { |
| 5758 | TemplateArgumentLoc ConvertedArg = convertTypeTemplateArgumentToTemplate( |
| 5759 | Context, Arg.getTypeSourceInfo()->getTypeLoc()); |
| 5760 | if (!ConvertedArg.getArgument().isNull()) |
| 5761 | Arg = ConvertedArg; |
| 5762 | } |
| 5763 | |
| 5764 | switch (Arg.getArgument().getKind()) { |
| 5765 | case TemplateArgument::Null: |
| 5766 | llvm_unreachable("Should never see a NULL template argument here")::llvm::llvm_unreachable_internal("Should never see a NULL template argument here" , "clang/lib/Sema/SemaTemplate.cpp", 5766); |
| 5767 | |
| 5768 | case TemplateArgument::Template: |
| 5769 | case TemplateArgument::TemplateExpansion: |
| 5770 | if (CheckTemplateTemplateArgument(TempParm, Params, Arg)) |
| 5771 | return true; |
| 5772 | |
| 5773 | SugaredConverted.push_back(Arg.getArgument()); |
| 5774 | CanonicalConverted.push_back( |
| 5775 | Context.getCanonicalTemplateArgument(Arg.getArgument())); |
| 5776 | break; |
| 5777 | |
| 5778 | case TemplateArgument::Expression: |
| 5779 | case TemplateArgument::Type: |
| 5780 | // We have a template template parameter but the template |
| 5781 | // argument does not refer to a template. |
| 5782 | Diag(Arg.getLocation(), diag::err_template_arg_must_be_template) |
| 5783 | << getLangOpts().CPlusPlus11; |
| 5784 | return true; |
| 5785 | |
| 5786 | case TemplateArgument::Declaration: |
| 5787 | llvm_unreachable("Declaration argument with template template parameter")::llvm::llvm_unreachable_internal("Declaration argument with template template parameter" , "clang/lib/Sema/SemaTemplate.cpp", 5787); |
| 5788 | case TemplateArgument::Integral: |
| 5789 | llvm_unreachable("Integral argument with template template parameter")::llvm::llvm_unreachable_internal("Integral argument with template template parameter" , "clang/lib/Sema/SemaTemplate.cpp", 5789); |
| 5790 | case TemplateArgument::NullPtr: |
| 5791 | llvm_unreachable("Null pointer argument with template template parameter")::llvm::llvm_unreachable_internal("Null pointer argument with template template parameter" , "clang/lib/Sema/SemaTemplate.cpp", 5791); |
| 5792 | |
| 5793 | case TemplateArgument::Pack: |
| 5794 | llvm_unreachable("Caller must expand template argument packs")::llvm::llvm_unreachable_internal("Caller must expand template argument packs" , "clang/lib/Sema/SemaTemplate.cpp", 5794); |
| 5795 | } |
| 5796 | |
| 5797 | return false; |
| 5798 | } |
| 5799 | |
| 5800 | /// Diagnose a missing template argument. |
| 5801 | template<typename TemplateParmDecl> |
| 5802 | static bool diagnoseMissingArgument(Sema &S, SourceLocation Loc, |
| 5803 | TemplateDecl *TD, |
| 5804 | const TemplateParmDecl *D, |
| 5805 | TemplateArgumentListInfo &Args) { |
| 5806 | // Dig out the most recent declaration of the template parameter; there may be |
| 5807 | // declarations of the template that are more recent than TD. |
| 5808 | D = cast<TemplateParmDecl>(cast<TemplateDecl>(TD->getMostRecentDecl()) |
| 5809 | ->getTemplateParameters() |
| 5810 | ->getParam(D->getIndex())); |
| 5811 | |
| 5812 | // If there's a default argument that's not reachable, diagnose that we're |
| 5813 | // missing a module import. |
| 5814 | llvm::SmallVector<Module*, 8> Modules; |
| 5815 | if (D->hasDefaultArgument() && !S.hasReachableDefaultArgument(D, &Modules)) { |
| 5816 | S.diagnoseMissingImport(Loc, cast<NamedDecl>(TD), |
| 5817 | D->getDefaultArgumentLoc(), Modules, |
| 5818 | Sema::MissingImportKind::DefaultArgument, |
| 5819 | /*Recover*/true); |
| 5820 | return true; |
| 5821 | } |
| 5822 | |
| 5823 | // FIXME: If there's a more recent default argument that *is* visible, |
| 5824 | // diagnose that it was declared too late. |
| 5825 | |
| 5826 | TemplateParameterList *Params = TD->getTemplateParameters(); |
| 5827 | |
| 5828 | S.Diag(Loc, diag::err_template_arg_list_different_arity) |
| 5829 | << /*not enough args*/0 |
| 5830 | << (int)S.getTemplateNameKindForDiagnostics(TemplateName(TD)) |
| 5831 | << TD; |
| 5832 | S.Diag(TD->getLocation(), diag::note_template_decl_here) |
| 5833 | << Params->getSourceRange(); |
| 5834 | return true; |
| 5835 | } |
| 5836 | |
| 5837 | /// Check that the given template argument list is well-formed |
| 5838 | /// for specializing the given template. |
| 5839 | bool Sema::CheckTemplateArgumentList( |
| 5840 | TemplateDecl *Template, SourceLocation TemplateLoc, |
| 5841 | TemplateArgumentListInfo &TemplateArgs, bool PartialTemplateArgs, |
| 5842 | SmallVectorImpl<TemplateArgument> &SugaredConverted, |
| 5843 | SmallVectorImpl<TemplateArgument> &CanonicalConverted, |
| 5844 | bool UpdateArgsWithConversions, bool *ConstraintsNotSatisfied) { |
| 5845 | |
| 5846 | if (ConstraintsNotSatisfied) |
| 5847 | *ConstraintsNotSatisfied = false; |
| 5848 | |
| 5849 | // Make a copy of the template arguments for processing. Only make the |
| 5850 | // changes at the end when successful in matching the arguments to the |
| 5851 | // template. |
| 5852 | TemplateArgumentListInfo NewArgs = TemplateArgs; |
| 5853 | |
| 5854 | // Make sure we get the template parameter list from the most |
| 5855 | // recent declaration, since that is the only one that is guaranteed to |
| 5856 | // have all the default template argument information. |
| 5857 | TemplateParameterList *Params = |
| 5858 | cast<TemplateDecl>(Template->getMostRecentDecl()) |
| 5859 | ->getTemplateParameters(); |
| 5860 | |
| 5861 | SourceLocation RAngleLoc = NewArgs.getRAngleLoc(); |
| 5862 | |
| 5863 | // C++ [temp.arg]p1: |
| 5864 | // [...] The type and form of each template-argument specified in |
| 5865 | // a template-id shall match the type and form specified for the |
| 5866 | // corresponding parameter declared by the template in its |
| 5867 | // template-parameter-list. |
| 5868 | bool isTemplateTemplateParameter = isa<TemplateTemplateParmDecl>(Template); |
| 5869 | SmallVector<TemplateArgument, 2> SugaredArgumentPack; |
| 5870 | SmallVector<TemplateArgument, 2> CanonicalArgumentPack; |
| 5871 | unsigned ArgIdx = 0, NumArgs = NewArgs.size(); |
| 5872 | LocalInstantiationScope InstScope(*this, true); |
| 5873 | for (TemplateParameterList::iterator Param = Params->begin(), |
| 5874 | ParamEnd = Params->end(); |
| 5875 | Param != ParamEnd; /* increment in loop */) { |
| 5876 | // If we have an expanded parameter pack, make sure we don't have too |
| 5877 | // many arguments. |
| 5878 | if (std::optional<unsigned> Expansions = getExpandedPackSize(*Param)) { |
| 5879 | if (*Expansions == SugaredArgumentPack.size()) { |
| 5880 | // We're done with this parameter pack. Pack up its arguments and add |
| 5881 | // them to the list. |
| 5882 | SugaredConverted.push_back( |
| 5883 | TemplateArgument::CreatePackCopy(Context, SugaredArgumentPack)); |
| 5884 | SugaredArgumentPack.clear(); |
| 5885 | |
| 5886 | CanonicalConverted.push_back( |
| 5887 | TemplateArgument::CreatePackCopy(Context, CanonicalArgumentPack)); |
| 5888 | CanonicalArgumentPack.clear(); |
| 5889 | |
| 5890 | // This argument is assigned to the next parameter. |
| 5891 | ++Param; |
| 5892 | continue; |
| 5893 | } else if (ArgIdx == NumArgs && !PartialTemplateArgs) { |
| 5894 | // Not enough arguments for this parameter pack. |
| 5895 | Diag(TemplateLoc, diag::err_template_arg_list_different_arity) |
| 5896 | << /*not enough args*/0 |
| 5897 | << (int)getTemplateNameKindForDiagnostics(TemplateName(Template)) |
| 5898 | << Template; |
| 5899 | Diag(Template->getLocation(), diag::note_template_decl_here) |
| 5900 | << Params->getSourceRange(); |
| 5901 | return true; |
| 5902 | } |
| 5903 | } |
| 5904 | |
| 5905 | if (ArgIdx < NumArgs) { |
| 5906 | // Check the template argument we were given. |
| 5907 | if (CheckTemplateArgument(*Param, NewArgs[ArgIdx], Template, TemplateLoc, |
| 5908 | RAngleLoc, SugaredArgumentPack.size(), |
| 5909 | SugaredConverted, CanonicalConverted, |
| 5910 | CTAK_Specified)) |
| 5911 | return true; |
| 5912 | |
| 5913 | CanonicalConverted.back().setIsDefaulted( |
| 5914 | clang::isSubstitutedDefaultArgument( |
| 5915 | Context, NewArgs[ArgIdx].getArgument(), *Param, |
| 5916 | CanonicalConverted, Params->getDepth())); |
| 5917 | |
| 5918 | bool PackExpansionIntoNonPack = |
| 5919 | NewArgs[ArgIdx].getArgument().isPackExpansion() && |
| 5920 | (!(*Param)->isTemplateParameterPack() || getExpandedPackSize(*Param)); |
| 5921 | if (PackExpansionIntoNonPack && (isa<TypeAliasTemplateDecl>(Template) || |
| 5922 | isa<ConceptDecl>(Template))) { |
| 5923 | // Core issue 1430: we have a pack expansion as an argument to an |
| 5924 | // alias template, and it's not part of a parameter pack. This |
| 5925 | // can't be canonicalized, so reject it now. |
| 5926 | // As for concepts - we cannot normalize constraints where this |
| 5927 | // situation exists. |
| 5928 | Diag(NewArgs[ArgIdx].getLocation(), |
| 5929 | diag::err_template_expansion_into_fixed_list) |
| 5930 | << (isa<ConceptDecl>(Template) ? 1 : 0) |
| 5931 | << NewArgs[ArgIdx].getSourceRange(); |
| 5932 | Diag((*Param)->getLocation(), diag::note_template_param_here); |
| 5933 | return true; |
| 5934 | } |
| 5935 | |
| 5936 | // We're now done with this argument. |
| 5937 | ++ArgIdx; |
| 5938 | |
| 5939 | if ((*Param)->isTemplateParameterPack()) { |
| 5940 | // The template parameter was a template parameter pack, so take the |
| 5941 | // deduced argument and place it on the argument pack. Note that we |
| 5942 | // stay on the same template parameter so that we can deduce more |
| 5943 | // arguments. |
| 5944 | SugaredArgumentPack.push_back(SugaredConverted.pop_back_val()); |
| 5945 | CanonicalArgumentPack.push_back(CanonicalConverted.pop_back_val()); |
| 5946 | } else { |
| 5947 | // Move to the next template parameter. |
| 5948 |