1 //===--- SemaTemplateInstantiateDecl.cpp - C++ Template Decl Instantiation ===/
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //===----------------------------------------------------------------------===/
9 // This file implements C++ template instantiation for declarations.
11 //===----------------------------------------------------------------------===/
12 #include "clang/Sema/SemaInternal.h"
13 #include "clang/AST/ASTConsumer.h"
14 #include "clang/AST/ASTContext.h"
15 #include "clang/AST/ASTMutationListener.h"
16 #include "clang/AST/DeclTemplate.h"
17 #include "clang/AST/DeclVisitor.h"
18 #include "clang/AST/DependentDiagnostic.h"
19 #include "clang/AST/Expr.h"
20 #include "clang/AST/ExprCXX.h"
21 #include "clang/AST/TypeLoc.h"
22 #include "clang/Sema/Initialization.h"
23 #include "clang/Sema/Lookup.h"
24 #include "clang/Sema/PrettyDeclStackTrace.h"
25 #include "clang/Sema/Template.h"
27 using namespace clang;
29 static bool isDeclWithinFunction(const Decl *D) {
30 const DeclContext *DC = D->getDeclContext();
31 if (DC->isFunctionOrMethod())
35 return cast<CXXRecordDecl>(DC)->isLocalClass();
40 template<typename DeclT>
41 static bool SubstQualifier(Sema &SemaRef, const DeclT *OldDecl, DeclT *NewDecl,
42 const MultiLevelTemplateArgumentList &TemplateArgs) {
43 if (!OldDecl->getQualifierLoc())
46 assert((NewDecl->getFriendObjectKind() ||
47 !OldDecl->getLexicalDeclContext()->isDependentContext()) &&
48 "non-friend with qualified name defined in dependent context");
49 Sema::ContextRAII SavedContext(
51 const_cast<DeclContext *>(NewDecl->getFriendObjectKind()
52 ? NewDecl->getLexicalDeclContext()
53 : OldDecl->getLexicalDeclContext()));
55 NestedNameSpecifierLoc NewQualifierLoc
56 = SemaRef.SubstNestedNameSpecifierLoc(OldDecl->getQualifierLoc(),
62 NewDecl->setQualifierInfo(NewQualifierLoc);
66 bool TemplateDeclInstantiator::SubstQualifier(const DeclaratorDecl *OldDecl,
67 DeclaratorDecl *NewDecl) {
68 return ::SubstQualifier(SemaRef, OldDecl, NewDecl, TemplateArgs);
71 bool TemplateDeclInstantiator::SubstQualifier(const TagDecl *OldDecl,
73 return ::SubstQualifier(SemaRef, OldDecl, NewDecl, TemplateArgs);
76 // Include attribute instantiation code.
77 #include "clang/Sema/AttrTemplateInstantiate.inc"
79 static void instantiateDependentAlignedAttr(
80 Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
81 const AlignedAttr *Aligned, Decl *New, bool IsPackExpansion) {
82 if (Aligned->isAlignmentExpr()) {
83 // The alignment expression is a constant expression.
84 EnterExpressionEvaluationContext Unevaluated(S, Sema::ConstantEvaluated);
85 ExprResult Result = S.SubstExpr(Aligned->getAlignmentExpr(), TemplateArgs);
86 if (!Result.isInvalid())
87 S.AddAlignedAttr(Aligned->getLocation(), New, Result.getAs<Expr>(),
88 Aligned->getSpellingListIndex(), IsPackExpansion);
90 TypeSourceInfo *Result = S.SubstType(Aligned->getAlignmentType(),
91 TemplateArgs, Aligned->getLocation(),
94 S.AddAlignedAttr(Aligned->getLocation(), New, Result,
95 Aligned->getSpellingListIndex(), IsPackExpansion);
99 static void instantiateDependentAlignedAttr(
100 Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
101 const AlignedAttr *Aligned, Decl *New) {
102 if (!Aligned->isPackExpansion()) {
103 instantiateDependentAlignedAttr(S, TemplateArgs, Aligned, New, false);
107 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
108 if (Aligned->isAlignmentExpr())
109 S.collectUnexpandedParameterPacks(Aligned->getAlignmentExpr(),
112 S.collectUnexpandedParameterPacks(Aligned->getAlignmentType()->getTypeLoc(),
114 assert(!Unexpanded.empty() && "Pack expansion without parameter packs?");
116 // Determine whether we can expand this attribute pack yet.
117 bool Expand = true, RetainExpansion = false;
118 Optional<unsigned> NumExpansions;
119 // FIXME: Use the actual location of the ellipsis.
120 SourceLocation EllipsisLoc = Aligned->getLocation();
121 if (S.CheckParameterPacksForExpansion(EllipsisLoc, Aligned->getRange(),
122 Unexpanded, TemplateArgs, Expand,
123 RetainExpansion, NumExpansions))
127 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(S, -1);
128 instantiateDependentAlignedAttr(S, TemplateArgs, Aligned, New, true);
130 for (unsigned I = 0; I != *NumExpansions; ++I) {
131 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(S, I);
132 instantiateDependentAlignedAttr(S, TemplateArgs, Aligned, New, false);
137 static void instantiateDependentAssumeAlignedAttr(
138 Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
139 const AssumeAlignedAttr *Aligned, Decl *New) {
140 // The alignment expression is a constant expression.
141 EnterExpressionEvaluationContext Unevaluated(S, Sema::ConstantEvaluated);
143 Expr *E, *OE = nullptr;
144 ExprResult Result = S.SubstExpr(Aligned->getAlignment(), TemplateArgs);
145 if (Result.isInvalid())
147 E = Result.getAs<Expr>();
149 if (Aligned->getOffset()) {
150 Result = S.SubstExpr(Aligned->getOffset(), TemplateArgs);
151 if (Result.isInvalid())
153 OE = Result.getAs<Expr>();
156 S.AddAssumeAlignedAttr(Aligned->getLocation(), New, E, OE,
157 Aligned->getSpellingListIndex());
160 static void instantiateDependentAlignValueAttr(
161 Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
162 const AlignValueAttr *Aligned, Decl *New) {
163 // The alignment expression is a constant expression.
164 EnterExpressionEvaluationContext Unevaluated(S, Sema::ConstantEvaluated);
165 ExprResult Result = S.SubstExpr(Aligned->getAlignment(), TemplateArgs);
166 if (!Result.isInvalid())
167 S.AddAlignValueAttr(Aligned->getLocation(), New, Result.getAs<Expr>(),
168 Aligned->getSpellingListIndex());
171 static void instantiateDependentEnableIfAttr(
172 Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
173 const EnableIfAttr *A, const Decl *Tmpl, Decl *New) {
174 Expr *Cond = nullptr;
176 EnterExpressionEvaluationContext Unevaluated(S, Sema::Unevaluated);
177 ExprResult Result = S.SubstExpr(A->getCond(), TemplateArgs);
178 if (Result.isInvalid())
180 Cond = Result.getAs<Expr>();
182 if (!Cond->isTypeDependent()) {
183 ExprResult Converted = S.PerformContextuallyConvertToBool(Cond);
184 if (Converted.isInvalid())
186 Cond = Converted.get();
189 SmallVector<PartialDiagnosticAt, 8> Diags;
190 if (A->getCond()->isValueDependent() && !Cond->isValueDependent() &&
191 !Expr::isPotentialConstantExprUnevaluated(Cond, cast<FunctionDecl>(New),
193 S.Diag(A->getLocation(), diag::err_enable_if_never_constant_expr);
194 for (int I = 0, N = Diags.size(); I != N; ++I)
195 S.Diag(Diags[I].first, Diags[I].second);
199 EnableIfAttr *EIA = new (S.getASTContext())
200 EnableIfAttr(A->getLocation(), S.getASTContext(), Cond,
202 A->getSpellingListIndex());
206 // Constructs and adds to New a new instance of CUDALaunchBoundsAttr using
207 // template A as the base and arguments from TemplateArgs.
208 static void instantiateDependentCUDALaunchBoundsAttr(
209 Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
210 const CUDALaunchBoundsAttr &Attr, Decl *New) {
211 // The alignment expression is a constant expression.
212 EnterExpressionEvaluationContext Unevaluated(S, Sema::ConstantEvaluated);
214 ExprResult Result = S.SubstExpr(Attr.getMaxThreads(), TemplateArgs);
215 if (Result.isInvalid())
217 Expr *MaxThreads = Result.getAs<Expr>();
219 Expr *MinBlocks = nullptr;
220 if (Attr.getMinBlocks()) {
221 Result = S.SubstExpr(Attr.getMinBlocks(), TemplateArgs);
222 if (Result.isInvalid())
224 MinBlocks = Result.getAs<Expr>();
227 S.AddLaunchBoundsAttr(Attr.getLocation(), New, MaxThreads, MinBlocks,
228 Attr.getSpellingListIndex());
232 instantiateDependentModeAttr(Sema &S,
233 const MultiLevelTemplateArgumentList &TemplateArgs,
234 const ModeAttr &Attr, Decl *New) {
235 S.AddModeAttr(Attr.getRange(), New, Attr.getMode(),
236 Attr.getSpellingListIndex(), /*InInstantiation=*/true);
239 /// Instantiation of 'declare simd' attribute and its arguments.
240 static void instantiateOMPDeclareSimdDeclAttr(
241 Sema &S, const MultiLevelTemplateArgumentList &TemplateArgs,
242 const OMPDeclareSimdDeclAttr &Attr, Decl *New) {
243 // Allow 'this' in clauses with varlists.
244 if (auto *FTD = dyn_cast<FunctionTemplateDecl>(New))
245 New = FTD->getTemplatedDecl();
246 auto *FD = cast<FunctionDecl>(New);
247 auto *ThisContext = dyn_cast_or_null<CXXRecordDecl>(FD->getDeclContext());
248 SmallVector<Expr *, 4> Uniforms, Aligneds, Alignments, Linears, Steps;
249 SmallVector<unsigned, 4> LinModifiers;
251 auto &&Subst = [&](Expr *E) -> ExprResult {
252 if (auto *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParenImpCasts()))
253 if (auto *PVD = dyn_cast<ParmVarDecl>(DRE->getDecl())) {
254 Sema::ContextRAII SavedContext(S, FD);
255 LocalInstantiationScope Local(S);
256 if (FD->getNumParams() > PVD->getFunctionScopeIndex())
257 Local.InstantiatedLocal(
258 PVD, FD->getParamDecl(PVD->getFunctionScopeIndex()));
259 return S.SubstExpr(E, TemplateArgs);
261 Sema::CXXThisScopeRAII ThisScope(S, ThisContext, /*TypeQuals=*/0,
262 FD->isCXXInstanceMember());
263 return S.SubstExpr(E, TemplateArgs);
267 if (auto *E = Attr.getSimdlen())
270 if (Attr.uniforms_size() > 0) {
271 for(auto *E : Attr.uniforms()) {
272 ExprResult Inst = Subst(E);
273 if (Inst.isInvalid())
275 Uniforms.push_back(Inst.get());
279 auto AI = Attr.alignments_begin();
280 for (auto *E : Attr.aligneds()) {
281 ExprResult Inst = Subst(E);
282 if (Inst.isInvalid())
284 Aligneds.push_back(Inst.get());
287 Inst = S.SubstExpr(*AI, TemplateArgs);
288 Alignments.push_back(Inst.get());
292 auto SI = Attr.steps_begin();
293 for (auto *E : Attr.linears()) {
294 ExprResult Inst = Subst(E);
295 if (Inst.isInvalid())
297 Linears.push_back(Inst.get());
300 Inst = S.SubstExpr(*SI, TemplateArgs);
301 Steps.push_back(Inst.get());
304 LinModifiers.append(Attr.modifiers_begin(), Attr.modifiers_end());
305 (void)S.ActOnOpenMPDeclareSimdDirective(
306 S.ConvertDeclToDeclGroup(New), Attr.getBranchState(), Simdlen.get(),
307 Uniforms, Aligneds, Alignments, Linears, LinModifiers, Steps,
311 void Sema::InstantiateAttrs(const MultiLevelTemplateArgumentList &TemplateArgs,
312 const Decl *Tmpl, Decl *New,
313 LateInstantiatedAttrVec *LateAttrs,
314 LocalInstantiationScope *OuterMostScope) {
315 for (const auto *TmplAttr : Tmpl->attrs()) {
316 // FIXME: This should be generalized to more than just the AlignedAttr.
317 const AlignedAttr *Aligned = dyn_cast<AlignedAttr>(TmplAttr);
318 if (Aligned && Aligned->isAlignmentDependent()) {
319 instantiateDependentAlignedAttr(*this, TemplateArgs, Aligned, New);
323 const AssumeAlignedAttr *AssumeAligned = dyn_cast<AssumeAlignedAttr>(TmplAttr);
325 instantiateDependentAssumeAlignedAttr(*this, TemplateArgs, AssumeAligned, New);
329 const AlignValueAttr *AlignValue = dyn_cast<AlignValueAttr>(TmplAttr);
331 instantiateDependentAlignValueAttr(*this, TemplateArgs, AlignValue, New);
335 if (const auto *EnableIf = dyn_cast<EnableIfAttr>(TmplAttr)) {
336 instantiateDependentEnableIfAttr(*this, TemplateArgs, EnableIf, Tmpl,
341 if (const CUDALaunchBoundsAttr *CUDALaunchBounds =
342 dyn_cast<CUDALaunchBoundsAttr>(TmplAttr)) {
343 instantiateDependentCUDALaunchBoundsAttr(*this, TemplateArgs,
344 *CUDALaunchBounds, New);
348 if (const ModeAttr *Mode = dyn_cast<ModeAttr>(TmplAttr)) {
349 instantiateDependentModeAttr(*this, TemplateArgs, *Mode, New);
353 if (const auto *OMPAttr = dyn_cast<OMPDeclareSimdDeclAttr>(TmplAttr)) {
354 instantiateOMPDeclareSimdDeclAttr(*this, TemplateArgs, *OMPAttr, New);
358 // Existing DLL attribute on the instantiation takes precedence.
359 if (TmplAttr->getKind() == attr::DLLExport ||
360 TmplAttr->getKind() == attr::DLLImport) {
361 if (New->hasAttr<DLLExportAttr>() || New->hasAttr<DLLImportAttr>()) {
366 if (auto ABIAttr = dyn_cast<ParameterABIAttr>(TmplAttr)) {
367 AddParameterABIAttr(ABIAttr->getRange(), New, ABIAttr->getABI(),
368 ABIAttr->getSpellingListIndex());
372 if (isa<NSConsumedAttr>(TmplAttr) || isa<CFConsumedAttr>(TmplAttr)) {
373 AddNSConsumedAttr(TmplAttr->getRange(), New,
374 TmplAttr->getSpellingListIndex(),
375 isa<NSConsumedAttr>(TmplAttr),
376 /*template instantiation*/ true);
380 assert(!TmplAttr->isPackExpansion());
381 if (TmplAttr->isLateParsed() && LateAttrs) {
382 // Late parsed attributes must be instantiated and attached after the
383 // enclosing class has been instantiated. See Sema::InstantiateClass.
384 LocalInstantiationScope *Saved = nullptr;
385 if (CurrentInstantiationScope)
386 Saved = CurrentInstantiationScope->cloneScopes(OuterMostScope);
387 LateAttrs->push_back(LateInstantiatedAttribute(TmplAttr, Saved, New));
389 // Allow 'this' within late-parsed attributes.
390 NamedDecl *ND = dyn_cast<NamedDecl>(New);
391 CXXRecordDecl *ThisContext =
392 dyn_cast_or_null<CXXRecordDecl>(ND->getDeclContext());
393 CXXThisScopeRAII ThisScope(*this, ThisContext, /*TypeQuals*/0,
394 ND && ND->isCXXInstanceMember());
396 Attr *NewAttr = sema::instantiateTemplateAttribute(TmplAttr, Context,
397 *this, TemplateArgs);
399 New->addAttr(NewAttr);
404 /// Get the previous declaration of a declaration for the purposes of template
405 /// instantiation. If this finds a previous declaration, then the previous
406 /// declaration of the instantiation of D should be an instantiation of the
407 /// result of this function.
408 template<typename DeclT>
409 static DeclT *getPreviousDeclForInstantiation(DeclT *D) {
410 DeclT *Result = D->getPreviousDecl();
412 // If the declaration is within a class, and the previous declaration was
413 // merged from a different definition of that class, then we don't have a
414 // previous declaration for the purpose of template instantiation.
415 if (Result && isa<CXXRecordDecl>(D->getDeclContext()) &&
416 D->getLexicalDeclContext() != Result->getLexicalDeclContext())
423 TemplateDeclInstantiator::VisitTranslationUnitDecl(TranslationUnitDecl *D) {
424 llvm_unreachable("Translation units cannot be instantiated");
428 TemplateDeclInstantiator::VisitPragmaCommentDecl(PragmaCommentDecl *D) {
429 llvm_unreachable("pragma comment cannot be instantiated");
432 Decl *TemplateDeclInstantiator::VisitPragmaDetectMismatchDecl(
433 PragmaDetectMismatchDecl *D) {
434 llvm_unreachable("pragma comment cannot be instantiated");
438 TemplateDeclInstantiator::VisitExternCContextDecl(ExternCContextDecl *D) {
439 llvm_unreachable("extern \"C\" context cannot be instantiated");
443 TemplateDeclInstantiator::VisitLabelDecl(LabelDecl *D) {
444 LabelDecl *Inst = LabelDecl::Create(SemaRef.Context, Owner, D->getLocation(),
446 Owner->addDecl(Inst);
451 TemplateDeclInstantiator::VisitNamespaceDecl(NamespaceDecl *D) {
452 llvm_unreachable("Namespaces cannot be instantiated");
456 TemplateDeclInstantiator::VisitNamespaceAliasDecl(NamespaceAliasDecl *D) {
457 NamespaceAliasDecl *Inst
458 = NamespaceAliasDecl::Create(SemaRef.Context, Owner,
459 D->getNamespaceLoc(),
462 D->getQualifierLoc(),
463 D->getTargetNameLoc(),
465 Owner->addDecl(Inst);
469 Decl *TemplateDeclInstantiator::InstantiateTypedefNameDecl(TypedefNameDecl *D,
471 bool Invalid = false;
472 TypeSourceInfo *DI = D->getTypeSourceInfo();
473 if (DI->getType()->isInstantiationDependentType() ||
474 DI->getType()->isVariablyModifiedType()) {
475 DI = SemaRef.SubstType(DI, TemplateArgs,
476 D->getLocation(), D->getDeclName());
479 DI = SemaRef.Context.getTrivialTypeSourceInfo(SemaRef.Context.IntTy);
482 SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType());
485 // HACK: g++ has a bug where it gets the value kind of ?: wrong.
486 // libstdc++ relies upon this bug in its implementation of common_type.
487 // If we happen to be processing that implementation, fake up the g++ ?:
488 // semantics. See LWG issue 2141 for more information on the bug.
489 const DecltypeType *DT = DI->getType()->getAs<DecltypeType>();
490 CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D->getDeclContext());
491 if (DT && RD && isa<ConditionalOperator>(DT->getUnderlyingExpr()) &&
492 DT->isReferenceType() &&
493 RD->getEnclosingNamespaceContext() == SemaRef.getStdNamespace() &&
494 RD->getIdentifier() && RD->getIdentifier()->isStr("common_type") &&
495 D->getIdentifier() && D->getIdentifier()->isStr("type") &&
496 SemaRef.getSourceManager().isInSystemHeader(D->getLocStart()))
497 // Fold it to the (non-reference) type which g++ would have produced.
498 DI = SemaRef.Context.getTrivialTypeSourceInfo(
499 DI->getType().getNonReferenceType());
501 // Create the new typedef
502 TypedefNameDecl *Typedef;
504 Typedef = TypeAliasDecl::Create(SemaRef.Context, Owner, D->getLocStart(),
505 D->getLocation(), D->getIdentifier(), DI);
507 Typedef = TypedefDecl::Create(SemaRef.Context, Owner, D->getLocStart(),
508 D->getLocation(), D->getIdentifier(), DI);
510 Typedef->setInvalidDecl();
512 // If the old typedef was the name for linkage purposes of an anonymous
513 // tag decl, re-establish that relationship for the new typedef.
514 if (const TagType *oldTagType = D->getUnderlyingType()->getAs<TagType>()) {
515 TagDecl *oldTag = oldTagType->getDecl();
516 if (oldTag->getTypedefNameForAnonDecl() == D && !Invalid) {
517 TagDecl *newTag = DI->getType()->castAs<TagType>()->getDecl();
518 assert(!newTag->hasNameForLinkage());
519 newTag->setTypedefNameForAnonDecl(Typedef);
523 if (TypedefNameDecl *Prev = getPreviousDeclForInstantiation(D)) {
524 NamedDecl *InstPrev = SemaRef.FindInstantiatedDecl(D->getLocation(), Prev,
529 TypedefNameDecl *InstPrevTypedef = cast<TypedefNameDecl>(InstPrev);
531 // If the typedef types are not identical, reject them.
532 SemaRef.isIncompatibleTypedef(InstPrevTypedef, Typedef);
534 Typedef->setPreviousDecl(InstPrevTypedef);
537 SemaRef.InstantiateAttrs(TemplateArgs, D, Typedef);
539 Typedef->setAccess(D->getAccess());
544 Decl *TemplateDeclInstantiator::VisitTypedefDecl(TypedefDecl *D) {
545 Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/false);
547 Owner->addDecl(Typedef);
551 Decl *TemplateDeclInstantiator::VisitTypeAliasDecl(TypeAliasDecl *D) {
552 Decl *Typedef = InstantiateTypedefNameDecl(D, /*IsTypeAlias=*/true);
554 Owner->addDecl(Typedef);
559 TemplateDeclInstantiator::VisitTypeAliasTemplateDecl(TypeAliasTemplateDecl *D) {
560 // Create a local instantiation scope for this type alias template, which
561 // will contain the instantiations of the template parameters.
562 LocalInstantiationScope Scope(SemaRef);
564 TemplateParameterList *TempParams = D->getTemplateParameters();
565 TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
569 TypeAliasDecl *Pattern = D->getTemplatedDecl();
571 TypeAliasTemplateDecl *PrevAliasTemplate = nullptr;
572 if (getPreviousDeclForInstantiation<TypedefNameDecl>(Pattern)) {
573 DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName());
574 if (!Found.empty()) {
575 PrevAliasTemplate = dyn_cast<TypeAliasTemplateDecl>(Found.front());
579 TypeAliasDecl *AliasInst = cast_or_null<TypeAliasDecl>(
580 InstantiateTypedefNameDecl(Pattern, /*IsTypeAlias=*/true));
584 TypeAliasTemplateDecl *Inst
585 = TypeAliasTemplateDecl::Create(SemaRef.Context, Owner, D->getLocation(),
586 D->getDeclName(), InstParams, AliasInst);
587 AliasInst->setDescribedAliasTemplate(Inst);
588 if (PrevAliasTemplate)
589 Inst->setPreviousDecl(PrevAliasTemplate);
591 Inst->setAccess(D->getAccess());
593 if (!PrevAliasTemplate)
594 Inst->setInstantiatedFromMemberTemplate(D);
596 Owner->addDecl(Inst);
601 Decl *TemplateDeclInstantiator::VisitBindingDecl(BindingDecl *D) {
602 auto *NewBD = BindingDecl::Create(SemaRef.Context, Owner, D->getLocation(),
604 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, NewBD);
608 Decl *TemplateDeclInstantiator::VisitDecompositionDecl(DecompositionDecl *D) {
609 // Transform the bindings first.
610 SmallVector<BindingDecl*, 16> NewBindings;
611 for (auto *OldBD : D->bindings())
612 NewBindings.push_back(cast<BindingDecl>(VisitBindingDecl(OldBD)));
613 ArrayRef<BindingDecl*> NewBindingArray = NewBindings;
615 auto *NewDD = cast_or_null<DecompositionDecl>(
616 VisitVarDecl(D, /*InstantiatingVarTemplate=*/false, &NewBindingArray));
618 if (!NewDD || NewDD->isInvalidDecl())
619 for (auto *NewBD : NewBindings)
620 NewBD->setInvalidDecl();
625 Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D) {
626 return VisitVarDecl(D, /*InstantiatingVarTemplate=*/false);
629 Decl *TemplateDeclInstantiator::VisitVarDecl(VarDecl *D,
630 bool InstantiatingVarTemplate,
631 ArrayRef<BindingDecl*> *Bindings) {
633 // Do substitution on the type of the declaration
634 TypeSourceInfo *DI = SemaRef.SubstType(D->getTypeSourceInfo(),
636 D->getTypeSpecStartLoc(),
641 if (DI->getType()->isFunctionType()) {
642 SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function)
643 << D->isStaticDataMember() << DI->getType();
647 DeclContext *DC = Owner;
648 if (D->isLocalExternDecl())
649 SemaRef.adjustContextForLocalExternDecl(DC);
651 // Build the instantiated declaration.
654 Var = DecompositionDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(),
655 D->getLocation(), DI->getType(), DI,
656 D->getStorageClass(), *Bindings);
658 Var = VarDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(),
659 D->getLocation(), D->getIdentifier(), DI->getType(),
660 DI, D->getStorageClass());
662 // In ARC, infer 'retaining' for variables of retainable type.
663 if (SemaRef.getLangOpts().ObjCAutoRefCount &&
664 SemaRef.inferObjCARCLifetime(Var))
665 Var->setInvalidDecl();
667 // Substitute the nested name specifier, if any.
668 if (SubstQualifier(D, Var))
671 SemaRef.BuildVariableInstantiation(Var, D, TemplateArgs, LateAttrs, Owner,
672 StartingScope, InstantiatingVarTemplate);
674 if (D->isNRVOVariable()) {
675 QualType ReturnType = cast<FunctionDecl>(DC)->getReturnType();
676 if (SemaRef.isCopyElisionCandidate(ReturnType, Var, false))
677 Var->setNRVOVariable(true);
680 Var->setImplicit(D->isImplicit());
685 Decl *TemplateDeclInstantiator::VisitAccessSpecDecl(AccessSpecDecl *D) {
687 = AccessSpecDecl::Create(SemaRef.Context, D->getAccess(), Owner,
688 D->getAccessSpecifierLoc(), D->getColonLoc());
689 Owner->addHiddenDecl(AD);
693 Decl *TemplateDeclInstantiator::VisitFieldDecl(FieldDecl *D) {
694 bool Invalid = false;
695 TypeSourceInfo *DI = D->getTypeSourceInfo();
696 if (DI->getType()->isInstantiationDependentType() ||
697 DI->getType()->isVariablyModifiedType()) {
698 DI = SemaRef.SubstType(DI, TemplateArgs,
699 D->getLocation(), D->getDeclName());
701 DI = D->getTypeSourceInfo();
703 } else if (DI->getType()->isFunctionType()) {
704 // C++ [temp.arg.type]p3:
705 // If a declaration acquires a function type through a type
706 // dependent on a template-parameter and this causes a
707 // declaration that does not use the syntactic form of a
708 // function declarator to have function type, the program is
710 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
715 SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType());
718 Expr *BitWidth = D->getBitWidth();
722 // The bit-width expression is a constant expression.
723 EnterExpressionEvaluationContext Unevaluated(SemaRef,
724 Sema::ConstantEvaluated);
726 ExprResult InstantiatedBitWidth
727 = SemaRef.SubstExpr(BitWidth, TemplateArgs);
728 if (InstantiatedBitWidth.isInvalid()) {
732 BitWidth = InstantiatedBitWidth.getAs<Expr>();
735 FieldDecl *Field = SemaRef.CheckFieldDecl(D->getDeclName(),
737 cast<RecordDecl>(Owner),
741 D->getInClassInitStyle(),
742 D->getInnerLocStart(),
746 cast<Decl>(Owner)->setInvalidDecl();
750 SemaRef.InstantiateAttrs(TemplateArgs, D, Field, LateAttrs, StartingScope);
752 if (Field->hasAttrs())
753 SemaRef.CheckAlignasUnderalignment(Field);
756 Field->setInvalidDecl();
758 if (!Field->getDeclName()) {
759 // Keep track of where this decl came from.
760 SemaRef.Context.setInstantiatedFromUnnamedFieldDecl(Field, D);
762 if (CXXRecordDecl *Parent= dyn_cast<CXXRecordDecl>(Field->getDeclContext())) {
763 if (Parent->isAnonymousStructOrUnion() &&
764 Parent->getRedeclContext()->isFunctionOrMethod())
765 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Field);
768 Field->setImplicit(D->isImplicit());
769 Field->setAccess(D->getAccess());
770 Owner->addDecl(Field);
775 Decl *TemplateDeclInstantiator::VisitMSPropertyDecl(MSPropertyDecl *D) {
776 bool Invalid = false;
777 TypeSourceInfo *DI = D->getTypeSourceInfo();
779 if (DI->getType()->isVariablyModifiedType()) {
780 SemaRef.Diag(D->getLocation(), diag::err_property_is_variably_modified)
783 } else if (DI->getType()->isInstantiationDependentType()) {
784 DI = SemaRef.SubstType(DI, TemplateArgs,
785 D->getLocation(), D->getDeclName());
787 DI = D->getTypeSourceInfo();
789 } else if (DI->getType()->isFunctionType()) {
790 // C++ [temp.arg.type]p3:
791 // If a declaration acquires a function type through a type
792 // dependent on a template-parameter and this causes a
793 // declaration that does not use the syntactic form of a
794 // function declarator to have function type, the program is
796 SemaRef.Diag(D->getLocation(), diag::err_field_instantiates_to_function)
801 SemaRef.MarkDeclarationsReferencedInType(D->getLocation(), DI->getType());
804 MSPropertyDecl *Property = MSPropertyDecl::Create(
805 SemaRef.Context, Owner, D->getLocation(), D->getDeclName(), DI->getType(),
806 DI, D->getLocStart(), D->getGetterId(), D->getSetterId());
808 SemaRef.InstantiateAttrs(TemplateArgs, D, Property, LateAttrs,
812 Property->setInvalidDecl();
814 Property->setAccess(D->getAccess());
815 Owner->addDecl(Property);
820 Decl *TemplateDeclInstantiator::VisitIndirectFieldDecl(IndirectFieldDecl *D) {
821 NamedDecl **NamedChain =
822 new (SemaRef.Context)NamedDecl*[D->getChainingSize()];
825 for (auto *PI : D->chain()) {
826 NamedDecl *Next = SemaRef.FindInstantiatedDecl(D->getLocation(), PI,
831 NamedChain[i++] = Next;
834 QualType T = cast<FieldDecl>(NamedChain[i-1])->getType();
835 IndirectFieldDecl *IndirectField = IndirectFieldDecl::Create(
836 SemaRef.Context, Owner, D->getLocation(), D->getIdentifier(), T,
837 {NamedChain, D->getChainingSize()});
839 for (const auto *Attr : D->attrs())
840 IndirectField->addAttr(Attr->clone(SemaRef.Context));
842 IndirectField->setImplicit(D->isImplicit());
843 IndirectField->setAccess(D->getAccess());
844 Owner->addDecl(IndirectField);
845 return IndirectField;
848 Decl *TemplateDeclInstantiator::VisitFriendDecl(FriendDecl *D) {
849 // Handle friend type expressions by simply substituting template
850 // parameters into the pattern type and checking the result.
851 if (TypeSourceInfo *Ty = D->getFriendType()) {
852 TypeSourceInfo *InstTy;
853 // If this is an unsupported friend, don't bother substituting template
854 // arguments into it. The actual type referred to won't be used by any
855 // parts of Clang, and may not be valid for instantiating. Just use the
856 // same info for the instantiated friend.
857 if (D->isUnsupportedFriend()) {
860 InstTy = SemaRef.SubstType(Ty, TemplateArgs,
861 D->getLocation(), DeclarationName());
866 FriendDecl *FD = SemaRef.CheckFriendTypeDecl(D->getLocStart(),
867 D->getFriendLoc(), InstTy);
871 FD->setAccess(AS_public);
872 FD->setUnsupportedFriend(D->isUnsupportedFriend());
877 NamedDecl *ND = D->getFriendDecl();
878 assert(ND && "friend decl must be a decl or a type!");
880 // All of the Visit implementations for the various potential friend
881 // declarations have to be carefully written to work for friend
882 // objects, with the most important detail being that the target
883 // decl should almost certainly not be placed in Owner.
884 Decl *NewND = Visit(ND);
885 if (!NewND) return nullptr;
888 FriendDecl::Create(SemaRef.Context, Owner, D->getLocation(),
889 cast<NamedDecl>(NewND), D->getFriendLoc());
890 FD->setAccess(AS_public);
891 FD->setUnsupportedFriend(D->isUnsupportedFriend());
896 Decl *TemplateDeclInstantiator::VisitStaticAssertDecl(StaticAssertDecl *D) {
897 Expr *AssertExpr = D->getAssertExpr();
899 // The expression in a static assertion is a constant expression.
900 EnterExpressionEvaluationContext Unevaluated(SemaRef,
901 Sema::ConstantEvaluated);
903 ExprResult InstantiatedAssertExpr
904 = SemaRef.SubstExpr(AssertExpr, TemplateArgs);
905 if (InstantiatedAssertExpr.isInvalid())
908 return SemaRef.BuildStaticAssertDeclaration(D->getLocation(),
909 InstantiatedAssertExpr.get(),
915 Decl *TemplateDeclInstantiator::VisitEnumDecl(EnumDecl *D) {
916 EnumDecl *PrevDecl = nullptr;
917 if (EnumDecl *PatternPrev = getPreviousDeclForInstantiation(D)) {
918 NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(),
921 if (!Prev) return nullptr;
922 PrevDecl = cast<EnumDecl>(Prev);
925 EnumDecl *Enum = EnumDecl::Create(SemaRef.Context, Owner, D->getLocStart(),
926 D->getLocation(), D->getIdentifier(),
927 PrevDecl, D->isScoped(),
928 D->isScopedUsingClassTag(), D->isFixed());
930 if (TypeSourceInfo *TI = D->getIntegerTypeSourceInfo()) {
931 // If we have type source information for the underlying type, it means it
932 // has been explicitly set by the user. Perform substitution on it before
934 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
935 TypeSourceInfo *NewTI = SemaRef.SubstType(TI, TemplateArgs, UnderlyingLoc,
937 if (!NewTI || SemaRef.CheckEnumUnderlyingType(NewTI))
938 Enum->setIntegerType(SemaRef.Context.IntTy);
940 Enum->setIntegerTypeSourceInfo(NewTI);
942 assert(!D->getIntegerType()->isDependentType()
943 && "Dependent type without type source info");
944 Enum->setIntegerType(D->getIntegerType());
948 SemaRef.InstantiateAttrs(TemplateArgs, D, Enum);
950 Enum->setInstantiationOfMemberEnum(D, TSK_ImplicitInstantiation);
951 Enum->setAccess(D->getAccess());
952 // Forward the mangling number from the template to the instantiated decl.
953 SemaRef.Context.setManglingNumber(Enum, SemaRef.Context.getManglingNumber(D));
954 // See if the old tag was defined along with a declarator.
955 // If it did, mark the new tag as being associated with that declarator.
956 if (DeclaratorDecl *DD = SemaRef.Context.getDeclaratorForUnnamedTagDecl(D))
957 SemaRef.Context.addDeclaratorForUnnamedTagDecl(Enum, DD);
958 // See if the old tag was defined along with a typedef.
959 // If it did, mark the new tag as being associated with that typedef.
960 if (TypedefNameDecl *TND = SemaRef.Context.getTypedefNameForUnnamedTagDecl(D))
961 SemaRef.Context.addTypedefNameForUnnamedTagDecl(Enum, TND);
962 if (SubstQualifier(D, Enum)) return nullptr;
963 Owner->addDecl(Enum);
965 EnumDecl *Def = D->getDefinition();
966 if (Def && Def != D) {
967 // If this is an out-of-line definition of an enum member template, check
968 // that the underlying types match in the instantiation of both
970 if (TypeSourceInfo *TI = Def->getIntegerTypeSourceInfo()) {
971 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc();
972 QualType DefnUnderlying =
973 SemaRef.SubstType(TI->getType(), TemplateArgs,
974 UnderlyingLoc, DeclarationName());
975 SemaRef.CheckEnumRedeclaration(Def->getLocation(), Def->isScoped(),
977 /*EnumUnderlyingIsImplicit=*/false, Enum);
981 // C++11 [temp.inst]p1: The implicit instantiation of a class template
982 // specialization causes the implicit instantiation of the declarations, but
983 // not the definitions of scoped member enumerations.
985 // DR1484 clarifies that enumeration definitions inside of a template
986 // declaration aren't considered entities that can be separately instantiated
987 // from the rest of the entity they are declared inside of.
988 if (isDeclWithinFunction(D) ? D == Def : Def && !Enum->isScoped()) {
989 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Enum);
990 InstantiateEnumDefinition(Enum, Def);
996 void TemplateDeclInstantiator::InstantiateEnumDefinition(
997 EnumDecl *Enum, EnumDecl *Pattern) {
998 Enum->startDefinition();
1000 // Update the location to refer to the definition.
1001 Enum->setLocation(Pattern->getLocation());
1003 SmallVector<Decl*, 4> Enumerators;
1005 EnumConstantDecl *LastEnumConst = nullptr;
1006 for (auto *EC : Pattern->enumerators()) {
1007 // The specified value for the enumerator.
1008 ExprResult Value((Expr *)nullptr);
1009 if (Expr *UninstValue = EC->getInitExpr()) {
1010 // The enumerator's value expression is a constant expression.
1011 EnterExpressionEvaluationContext Unevaluated(SemaRef,
1012 Sema::ConstantEvaluated);
1014 Value = SemaRef.SubstExpr(UninstValue, TemplateArgs);
1017 // Drop the initial value and continue.
1018 bool isInvalid = false;
1019 if (Value.isInvalid()) {
1024 EnumConstantDecl *EnumConst
1025 = SemaRef.CheckEnumConstant(Enum, LastEnumConst,
1026 EC->getLocation(), EC->getIdentifier(),
1031 EnumConst->setInvalidDecl();
1032 Enum->setInvalidDecl();
1036 SemaRef.InstantiateAttrs(TemplateArgs, EC, EnumConst);
1038 EnumConst->setAccess(Enum->getAccess());
1039 Enum->addDecl(EnumConst);
1040 Enumerators.push_back(EnumConst);
1041 LastEnumConst = EnumConst;
1043 if (Pattern->getDeclContext()->isFunctionOrMethod() &&
1044 !Enum->isScoped()) {
1045 // If the enumeration is within a function or method, record the enum
1046 // constant as a local.
1047 SemaRef.CurrentInstantiationScope->InstantiatedLocal(EC, EnumConst);
1052 SemaRef.ActOnEnumBody(Enum->getLocation(), Enum->getBraceRange(), Enum,
1057 Decl *TemplateDeclInstantiator::VisitEnumConstantDecl(EnumConstantDecl *D) {
1058 llvm_unreachable("EnumConstantDecls can only occur within EnumDecls.");
1062 TemplateDeclInstantiator::VisitBuiltinTemplateDecl(BuiltinTemplateDecl *D) {
1063 llvm_unreachable("BuiltinTemplateDecls cannot be instantiated.");
1066 Decl *TemplateDeclInstantiator::VisitClassTemplateDecl(ClassTemplateDecl *D) {
1067 bool isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
1069 // Create a local instantiation scope for this class template, which
1070 // will contain the instantiations of the template parameters.
1071 LocalInstantiationScope Scope(SemaRef);
1072 TemplateParameterList *TempParams = D->getTemplateParameters();
1073 TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
1077 CXXRecordDecl *Pattern = D->getTemplatedDecl();
1079 // Instantiate the qualifier. We have to do this first in case
1080 // we're a friend declaration, because if we are then we need to put
1081 // the new declaration in the appropriate context.
1082 NestedNameSpecifierLoc QualifierLoc = Pattern->getQualifierLoc();
1084 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
1090 CXXRecordDecl *PrevDecl = nullptr;
1091 ClassTemplateDecl *PrevClassTemplate = nullptr;
1093 if (!isFriend && getPreviousDeclForInstantiation(Pattern)) {
1094 DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName());
1095 if (!Found.empty()) {
1096 PrevClassTemplate = dyn_cast<ClassTemplateDecl>(Found.front());
1097 if (PrevClassTemplate)
1098 PrevDecl = PrevClassTemplate->getTemplatedDecl();
1102 // If this isn't a friend, then it's a member template, in which
1103 // case we just want to build the instantiation in the
1104 // specialization. If it is a friend, we want to build it in
1105 // the appropriate context.
1106 DeclContext *DC = Owner;
1110 SS.Adopt(QualifierLoc);
1111 DC = SemaRef.computeDeclContext(SS);
1112 if (!DC) return nullptr;
1114 DC = SemaRef.FindInstantiatedContext(Pattern->getLocation(),
1115 Pattern->getDeclContext(),
1119 // Look for a previous declaration of the template in the owning
1121 LookupResult R(SemaRef, Pattern->getDeclName(), Pattern->getLocation(),
1122 Sema::LookupOrdinaryName, Sema::ForRedeclaration);
1123 SemaRef.LookupQualifiedName(R, DC);
1125 if (R.isSingleResult()) {
1126 PrevClassTemplate = R.getAsSingle<ClassTemplateDecl>();
1127 if (PrevClassTemplate)
1128 PrevDecl = PrevClassTemplate->getTemplatedDecl();
1131 if (!PrevClassTemplate && QualifierLoc) {
1132 SemaRef.Diag(Pattern->getLocation(), diag::err_not_tag_in_scope)
1133 << D->getTemplatedDecl()->getTagKind() << Pattern->getDeclName() << DC
1134 << QualifierLoc.getSourceRange();
1138 bool AdoptedPreviousTemplateParams = false;
1139 if (PrevClassTemplate) {
1140 bool Complain = true;
1142 // HACK: libstdc++ 4.2.1 contains an ill-formed friend class
1143 // template for struct std::tr1::__detail::_Map_base, where the
1144 // template parameters of the friend declaration don't match the
1145 // template parameters of the original declaration. In this one
1146 // case, we don't complain about the ill-formed friend
1148 if (isFriend && Pattern->getIdentifier() &&
1149 Pattern->getIdentifier()->isStr("_Map_base") &&
1150 DC->isNamespace() &&
1151 cast<NamespaceDecl>(DC)->getIdentifier() &&
1152 cast<NamespaceDecl>(DC)->getIdentifier()->isStr("__detail")) {
1153 DeclContext *DCParent = DC->getParent();
1154 if (DCParent->isNamespace() &&
1155 cast<NamespaceDecl>(DCParent)->getIdentifier() &&
1156 cast<NamespaceDecl>(DCParent)->getIdentifier()->isStr("tr1")) {
1157 if (cast<Decl>(DCParent)->isInStdNamespace())
1162 TemplateParameterList *PrevParams
1163 = PrevClassTemplate->getTemplateParameters();
1165 // Make sure the parameter lists match.
1166 if (!SemaRef.TemplateParameterListsAreEqual(InstParams, PrevParams,
1168 Sema::TPL_TemplateMatch)) {
1172 AdoptedPreviousTemplateParams = true;
1173 InstParams = PrevParams;
1176 // Do some additional validation, then merge default arguments
1177 // from the existing declarations.
1178 if (!AdoptedPreviousTemplateParams &&
1179 SemaRef.CheckTemplateParameterList(InstParams, PrevParams,
1180 Sema::TPC_ClassTemplate))
1185 CXXRecordDecl *RecordInst
1186 = CXXRecordDecl::Create(SemaRef.Context, Pattern->getTagKind(), DC,
1187 Pattern->getLocStart(), Pattern->getLocation(),
1188 Pattern->getIdentifier(), PrevDecl,
1189 /*DelayTypeCreation=*/true);
1192 RecordInst->setQualifierInfo(QualifierLoc);
1194 ClassTemplateDecl *Inst
1195 = ClassTemplateDecl::Create(SemaRef.Context, DC, D->getLocation(),
1196 D->getIdentifier(), InstParams, RecordInst,
1198 RecordInst->setDescribedClassTemplate(Inst);
1201 if (PrevClassTemplate)
1202 Inst->setAccess(PrevClassTemplate->getAccess());
1204 Inst->setAccess(D->getAccess());
1206 Inst->setObjectOfFriendDecl();
1207 // TODO: do we want to track the instantiation progeny of this
1208 // friend target decl?
1210 Inst->setAccess(D->getAccess());
1211 if (!PrevClassTemplate)
1212 Inst->setInstantiatedFromMemberTemplate(D);
1215 // Trigger creation of the type for the instantiation.
1216 SemaRef.Context.getInjectedClassNameType(RecordInst,
1217 Inst->getInjectedClassNameSpecialization());
1219 // Finish handling of friends.
1221 DC->makeDeclVisibleInContext(Inst);
1222 Inst->setLexicalDeclContext(Owner);
1223 RecordInst->setLexicalDeclContext(Owner);
1227 if (D->isOutOfLine()) {
1228 Inst->setLexicalDeclContext(D->getLexicalDeclContext());
1229 RecordInst->setLexicalDeclContext(D->getLexicalDeclContext());
1232 Owner->addDecl(Inst);
1234 if (!PrevClassTemplate) {
1235 // Queue up any out-of-line partial specializations of this member
1236 // class template; the client will force their instantiation once
1237 // the enclosing class has been instantiated.
1238 SmallVector<ClassTemplatePartialSpecializationDecl *, 4> PartialSpecs;
1239 D->getPartialSpecializations(PartialSpecs);
1240 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I)
1241 if (PartialSpecs[I]->getFirstDecl()->isOutOfLine())
1242 OutOfLinePartialSpecs.push_back(std::make_pair(Inst, PartialSpecs[I]));
1249 TemplateDeclInstantiator::VisitClassTemplatePartialSpecializationDecl(
1250 ClassTemplatePartialSpecializationDecl *D) {
1251 ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate();
1253 // Lookup the already-instantiated declaration in the instantiation
1254 // of the class template and return that.
1255 DeclContext::lookup_result Found
1256 = Owner->lookup(ClassTemplate->getDeclName());
1260 ClassTemplateDecl *InstClassTemplate
1261 = dyn_cast<ClassTemplateDecl>(Found.front());
1262 if (!InstClassTemplate)
1265 if (ClassTemplatePartialSpecializationDecl *Result
1266 = InstClassTemplate->findPartialSpecInstantiatedFromMember(D))
1269 return InstantiateClassTemplatePartialSpecialization(InstClassTemplate, D);
1272 Decl *TemplateDeclInstantiator::VisitVarTemplateDecl(VarTemplateDecl *D) {
1273 assert(D->getTemplatedDecl()->isStaticDataMember() &&
1274 "Only static data member templates are allowed.");
1276 // Create a local instantiation scope for this variable template, which
1277 // will contain the instantiations of the template parameters.
1278 LocalInstantiationScope Scope(SemaRef);
1279 TemplateParameterList *TempParams = D->getTemplateParameters();
1280 TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
1284 VarDecl *Pattern = D->getTemplatedDecl();
1285 VarTemplateDecl *PrevVarTemplate = nullptr;
1287 if (getPreviousDeclForInstantiation(Pattern)) {
1288 DeclContext::lookup_result Found = Owner->lookup(Pattern->getDeclName());
1290 PrevVarTemplate = dyn_cast<VarTemplateDecl>(Found.front());
1294 cast_or_null<VarDecl>(VisitVarDecl(Pattern,
1295 /*InstantiatingVarTemplate=*/true));
1296 if (!VarInst) return nullptr;
1298 DeclContext *DC = Owner;
1300 VarTemplateDecl *Inst = VarTemplateDecl::Create(
1301 SemaRef.Context, DC, D->getLocation(), D->getIdentifier(), InstParams,
1303 VarInst->setDescribedVarTemplate(Inst);
1304 Inst->setPreviousDecl(PrevVarTemplate);
1306 Inst->setAccess(D->getAccess());
1307 if (!PrevVarTemplate)
1308 Inst->setInstantiatedFromMemberTemplate(D);
1310 if (D->isOutOfLine()) {
1311 Inst->setLexicalDeclContext(D->getLexicalDeclContext());
1312 VarInst->setLexicalDeclContext(D->getLexicalDeclContext());
1315 Owner->addDecl(Inst);
1317 if (!PrevVarTemplate) {
1318 // Queue up any out-of-line partial specializations of this member
1319 // variable template; the client will force their instantiation once
1320 // the enclosing class has been instantiated.
1321 SmallVector<VarTemplatePartialSpecializationDecl *, 4> PartialSpecs;
1322 D->getPartialSpecializations(PartialSpecs);
1323 for (unsigned I = 0, N = PartialSpecs.size(); I != N; ++I)
1324 if (PartialSpecs[I]->getFirstDecl()->isOutOfLine())
1325 OutOfLineVarPartialSpecs.push_back(
1326 std::make_pair(Inst, PartialSpecs[I]));
1332 Decl *TemplateDeclInstantiator::VisitVarTemplatePartialSpecializationDecl(
1333 VarTemplatePartialSpecializationDecl *D) {
1334 assert(D->isStaticDataMember() &&
1335 "Only static data member templates are allowed.");
1337 VarTemplateDecl *VarTemplate = D->getSpecializedTemplate();
1339 // Lookup the already-instantiated declaration and return that.
1340 DeclContext::lookup_result Found = Owner->lookup(VarTemplate->getDeclName());
1341 assert(!Found.empty() && "Instantiation found nothing?");
1343 VarTemplateDecl *InstVarTemplate = dyn_cast<VarTemplateDecl>(Found.front());
1344 assert(InstVarTemplate && "Instantiation did not find a variable template?");
1346 if (VarTemplatePartialSpecializationDecl *Result =
1347 InstVarTemplate->findPartialSpecInstantiatedFromMember(D))
1350 return InstantiateVarTemplatePartialSpecialization(InstVarTemplate, D);
1354 TemplateDeclInstantiator::VisitFunctionTemplateDecl(FunctionTemplateDecl *D) {
1355 // Create a local instantiation scope for this function template, which
1356 // will contain the instantiations of the template parameters and then get
1357 // merged with the local instantiation scope for the function template
1359 LocalInstantiationScope Scope(SemaRef);
1361 TemplateParameterList *TempParams = D->getTemplateParameters();
1362 TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
1366 FunctionDecl *Instantiated = nullptr;
1367 if (CXXMethodDecl *DMethod = dyn_cast<CXXMethodDecl>(D->getTemplatedDecl()))
1368 Instantiated = cast_or_null<FunctionDecl>(VisitCXXMethodDecl(DMethod,
1371 Instantiated = cast_or_null<FunctionDecl>(VisitFunctionDecl(
1372 D->getTemplatedDecl(),
1378 // Link the instantiated function template declaration to the function
1379 // template from which it was instantiated.
1380 FunctionTemplateDecl *InstTemplate
1381 = Instantiated->getDescribedFunctionTemplate();
1382 InstTemplate->setAccess(D->getAccess());
1383 assert(InstTemplate &&
1384 "VisitFunctionDecl/CXXMethodDecl didn't create a template!");
1386 bool isFriend = (InstTemplate->getFriendObjectKind() != Decl::FOK_None);
1388 // Link the instantiation back to the pattern *unless* this is a
1389 // non-definition friend declaration.
1390 if (!InstTemplate->getInstantiatedFromMemberTemplate() &&
1391 !(isFriend && !D->getTemplatedDecl()->isThisDeclarationADefinition()))
1392 InstTemplate->setInstantiatedFromMemberTemplate(D);
1394 // Make declarations visible in the appropriate context.
1396 Owner->addDecl(InstTemplate);
1397 } else if (InstTemplate->getDeclContext()->isRecord() &&
1398 !getPreviousDeclForInstantiation(D)) {
1399 SemaRef.CheckFriendAccess(InstTemplate);
1402 return InstTemplate;
1405 Decl *TemplateDeclInstantiator::VisitCXXRecordDecl(CXXRecordDecl *D) {
1406 CXXRecordDecl *PrevDecl = nullptr;
1407 if (D->isInjectedClassName())
1408 PrevDecl = cast<CXXRecordDecl>(Owner);
1409 else if (CXXRecordDecl *PatternPrev = getPreviousDeclForInstantiation(D)) {
1410 NamedDecl *Prev = SemaRef.FindInstantiatedDecl(D->getLocation(),
1413 if (!Prev) return nullptr;
1414 PrevDecl = cast<CXXRecordDecl>(Prev);
1417 CXXRecordDecl *Record
1418 = CXXRecordDecl::Create(SemaRef.Context, D->getTagKind(), Owner,
1419 D->getLocStart(), D->getLocation(),
1420 D->getIdentifier(), PrevDecl);
1422 // Substitute the nested name specifier, if any.
1423 if (SubstQualifier(D, Record))
1426 Record->setImplicit(D->isImplicit());
1427 // FIXME: Check against AS_none is an ugly hack to work around the issue that
1428 // the tag decls introduced by friend class declarations don't have an access
1429 // specifier. Remove once this area of the code gets sorted out.
1430 if (D->getAccess() != AS_none)
1431 Record->setAccess(D->getAccess());
1432 if (!D->isInjectedClassName())
1433 Record->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation);
1435 // If the original function was part of a friend declaration,
1436 // inherit its namespace state.
1437 if (D->getFriendObjectKind())
1438 Record->setObjectOfFriendDecl();
1440 // Make sure that anonymous structs and unions are recorded.
1441 if (D->isAnonymousStructOrUnion())
1442 Record->setAnonymousStructOrUnion(true);
1444 if (D->isLocalClass())
1445 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Record);
1447 // Forward the mangling number from the template to the instantiated decl.
1448 SemaRef.Context.setManglingNumber(Record,
1449 SemaRef.Context.getManglingNumber(D));
1451 // See if the old tag was defined along with a declarator.
1452 // If it did, mark the new tag as being associated with that declarator.
1453 if (DeclaratorDecl *DD = SemaRef.Context.getDeclaratorForUnnamedTagDecl(D))
1454 SemaRef.Context.addDeclaratorForUnnamedTagDecl(Record, DD);
1456 // See if the old tag was defined along with a typedef.
1457 // If it did, mark the new tag as being associated with that typedef.
1458 if (TypedefNameDecl *TND = SemaRef.Context.getTypedefNameForUnnamedTagDecl(D))
1459 SemaRef.Context.addTypedefNameForUnnamedTagDecl(Record, TND);
1461 Owner->addDecl(Record);
1463 // DR1484 clarifies that the members of a local class are instantiated as part
1464 // of the instantiation of their enclosing entity.
1465 if (D->isCompleteDefinition() && D->isLocalClass()) {
1466 Sema::SavePendingLocalImplicitInstantiationsRAII
1467 SavedPendingLocalImplicitInstantiations(SemaRef);
1469 SemaRef.InstantiateClass(D->getLocation(), Record, D, TemplateArgs,
1470 TSK_ImplicitInstantiation,
1473 // For nested local classes, we will instantiate the members when we
1474 // reach the end of the outermost (non-nested) local class.
1475 if (!D->isCXXClassMember())
1476 SemaRef.InstantiateClassMembers(D->getLocation(), Record, TemplateArgs,
1477 TSK_ImplicitInstantiation);
1479 // This class may have local implicit instantiations that need to be
1480 // performed within this scope.
1481 SemaRef.PerformPendingInstantiations(/*LocalOnly=*/true);
1484 SemaRef.DiagnoseUnusedNestedTypedefs(Record);
1489 /// \brief Adjust the given function type for an instantiation of the
1490 /// given declaration, to cope with modifications to the function's type that
1491 /// aren't reflected in the type-source information.
1493 /// \param D The declaration we're instantiating.
1494 /// \param TInfo The already-instantiated type.
1495 static QualType adjustFunctionTypeForInstantiation(ASTContext &Context,
1497 TypeSourceInfo *TInfo) {
1498 const FunctionProtoType *OrigFunc
1499 = D->getType()->castAs<FunctionProtoType>();
1500 const FunctionProtoType *NewFunc
1501 = TInfo->getType()->castAs<FunctionProtoType>();
1502 if (OrigFunc->getExtInfo() == NewFunc->getExtInfo())
1503 return TInfo->getType();
1505 FunctionProtoType::ExtProtoInfo NewEPI = NewFunc->getExtProtoInfo();
1506 NewEPI.ExtInfo = OrigFunc->getExtInfo();
1507 return Context.getFunctionType(NewFunc->getReturnType(),
1508 NewFunc->getParamTypes(), NewEPI);
1511 /// Normal class members are of more specific types and therefore
1512 /// don't make it here. This function serves two purposes:
1513 /// 1) instantiating function templates
1514 /// 2) substituting friend declarations
1515 Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D,
1516 TemplateParameterList *TemplateParams) {
1517 // Check whether there is already a function template specialization for
1518 // this declaration.
1519 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
1520 if (FunctionTemplate && !TemplateParams) {
1521 ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
1523 void *InsertPos = nullptr;
1524 FunctionDecl *SpecFunc
1525 = FunctionTemplate->findSpecialization(Innermost, InsertPos);
1527 // If we already have a function template specialization, return it.
1533 if (FunctionTemplate)
1534 isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None);
1536 isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
1538 bool MergeWithParentScope = (TemplateParams != nullptr) ||
1539 Owner->isFunctionOrMethod() ||
1540 !(isa<Decl>(Owner) &&
1541 cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
1542 LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
1544 SmallVector<ParmVarDecl *, 4> Params;
1545 TypeSourceInfo *TInfo = SubstFunctionType(D, Params);
1548 QualType T = adjustFunctionTypeForInstantiation(SemaRef.Context, D, TInfo);
1550 NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc();
1552 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
1558 // If we're instantiating a local function declaration, put the result
1559 // in the enclosing namespace; otherwise we need to find the instantiated
1562 if (D->isLocalExternDecl()) {
1564 SemaRef.adjustContextForLocalExternDecl(DC);
1565 } else if (isFriend && QualifierLoc) {
1567 SS.Adopt(QualifierLoc);
1568 DC = SemaRef.computeDeclContext(SS);
1569 if (!DC) return nullptr;
1571 DC = SemaRef.FindInstantiatedContext(D->getLocation(), D->getDeclContext(),
1575 FunctionDecl *Function =
1576 FunctionDecl::Create(SemaRef.Context, DC, D->getInnerLocStart(),
1577 D->getNameInfo(), T, TInfo,
1578 D->getCanonicalDecl()->getStorageClass(),
1579 D->isInlineSpecified(), D->hasWrittenPrototype(),
1581 Function->setRangeEnd(D->getSourceRange().getEnd());
1584 Function->setImplicitlyInline();
1587 Function->setQualifierInfo(QualifierLoc);
1589 if (D->isLocalExternDecl())
1590 Function->setLocalExternDecl();
1592 DeclContext *LexicalDC = Owner;
1593 if (!isFriend && D->isOutOfLine() && !D->isLocalExternDecl()) {
1594 assert(D->getDeclContext()->isFileContext());
1595 LexicalDC = D->getDeclContext();
1598 Function->setLexicalDeclContext(LexicalDC);
1600 // Attach the parameters
1601 for (unsigned P = 0; P < Params.size(); ++P)
1603 Params[P]->setOwningFunction(Function);
1604 Function->setParams(Params);
1606 SourceLocation InstantiateAtPOI;
1607 if (TemplateParams) {
1608 // Our resulting instantiation is actually a function template, since we
1609 // are substituting only the outer template parameters. For example, given
1611 // template<typename T>
1613 // template<typename U> friend void f(T, U);
1618 // We are instantiating the friend function template "f" within X<int>,
1619 // which means substituting int for T, but leaving "f" as a friend function
1621 // Build the function template itself.
1622 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, DC,
1623 Function->getLocation(),
1624 Function->getDeclName(),
1625 TemplateParams, Function);
1626 Function->setDescribedFunctionTemplate(FunctionTemplate);
1628 FunctionTemplate->setLexicalDeclContext(LexicalDC);
1630 if (isFriend && D->isThisDeclarationADefinition()) {
1631 // TODO: should we remember this connection regardless of whether
1632 // the friend declaration provided a body?
1633 FunctionTemplate->setInstantiatedFromMemberTemplate(
1634 D->getDescribedFunctionTemplate());
1636 } else if (FunctionTemplate) {
1637 // Record this function template specialization.
1638 ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
1639 Function->setFunctionTemplateSpecialization(FunctionTemplate,
1640 TemplateArgumentList::CreateCopy(SemaRef.Context,
1642 /*InsertPos=*/nullptr);
1643 } else if (isFriend) {
1644 // Note, we need this connection even if the friend doesn't have a body.
1645 // Its body may exist but not have been attached yet due to deferred
1647 // FIXME: It might be cleaner to set this when attaching the body to the
1648 // friend function declaration, however that would require finding all the
1649 // instantiations and modifying them.
1650 Function->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
1653 if (InitFunctionInstantiation(Function, D))
1654 Function->setInvalidDecl();
1656 bool isExplicitSpecialization = false;
1658 LookupResult Previous(
1659 SemaRef, Function->getDeclName(), SourceLocation(),
1660 D->isLocalExternDecl() ? Sema::LookupRedeclarationWithLinkage
1661 : Sema::LookupOrdinaryName,
1662 Sema::ForRedeclaration);
1664 if (DependentFunctionTemplateSpecializationInfo *Info
1665 = D->getDependentSpecializationInfo()) {
1666 assert(isFriend && "non-friend has dependent specialization info?");
1668 // This needs to be set now for future sanity.
1669 Function->setObjectOfFriendDecl();
1671 // Instantiate the explicit template arguments.
1672 TemplateArgumentListInfo ExplicitArgs(Info->getLAngleLoc(),
1673 Info->getRAngleLoc());
1674 if (SemaRef.Subst(Info->getTemplateArgs(), Info->getNumTemplateArgs(),
1675 ExplicitArgs, TemplateArgs))
1678 // Map the candidate templates to their instantiations.
1679 for (unsigned I = 0, E = Info->getNumTemplates(); I != E; ++I) {
1680 Decl *Temp = SemaRef.FindInstantiatedDecl(D->getLocation(),
1681 Info->getTemplate(I),
1683 if (!Temp) return nullptr;
1685 Previous.addDecl(cast<FunctionTemplateDecl>(Temp));
1688 if (SemaRef.CheckFunctionTemplateSpecialization(Function,
1691 Function->setInvalidDecl();
1693 isExplicitSpecialization = true;
1695 } else if (TemplateParams || !FunctionTemplate) {
1696 // Look only into the namespace where the friend would be declared to
1697 // find a previous declaration. This is the innermost enclosing namespace,
1698 // as described in ActOnFriendFunctionDecl.
1699 SemaRef.LookupQualifiedName(Previous, DC);
1701 // In C++, the previous declaration we find might be a tag type
1702 // (class or enum). In this case, the new declaration will hide the
1703 // tag type. Note that this does does not apply if we're declaring a
1704 // typedef (C++ [dcl.typedef]p4).
1705 if (Previous.isSingleTagDecl())
1709 SemaRef.CheckFunctionDeclaration(/*Scope*/ nullptr, Function, Previous,
1710 isExplicitSpecialization);
1712 NamedDecl *PrincipalDecl = (TemplateParams
1713 ? cast<NamedDecl>(FunctionTemplate)
1716 // If the original function was part of a friend declaration,
1717 // inherit its namespace state and add it to the owner.
1719 PrincipalDecl->setObjectOfFriendDecl();
1720 DC->makeDeclVisibleInContext(PrincipalDecl);
1722 bool QueuedInstantiation = false;
1724 // C++11 [temp.friend]p4 (DR329):
1725 // When a function is defined in a friend function declaration in a class
1726 // template, the function is instantiated when the function is odr-used.
1727 // The same restrictions on multiple declarations and definitions that
1728 // apply to non-template function declarations and definitions also apply
1729 // to these implicit definitions.
1730 if (D->isThisDeclarationADefinition()) {
1731 // Check for a function body.
1732 const FunctionDecl *Definition = nullptr;
1733 if (Function->isDefined(Definition) &&
1734 Definition->getTemplateSpecializationKind() == TSK_Undeclared) {
1735 SemaRef.Diag(Function->getLocation(), diag::err_redefinition)
1736 << Function->getDeclName();
1737 SemaRef.Diag(Definition->getLocation(), diag::note_previous_definition);
1739 // Check for redefinitions due to other instantiations of this or
1740 // a similar friend function.
1741 else for (auto R : Function->redecls()) {
1745 // If some prior declaration of this function has been used, we need
1746 // to instantiate its definition.
1747 if (!QueuedInstantiation && R->isUsed(false)) {
1748 if (MemberSpecializationInfo *MSInfo =
1749 Function->getMemberSpecializationInfo()) {
1750 if (MSInfo->getPointOfInstantiation().isInvalid()) {
1751 SourceLocation Loc = R->getLocation(); // FIXME
1752 MSInfo->setPointOfInstantiation(Loc);
1753 SemaRef.PendingLocalImplicitInstantiations.push_back(
1754 std::make_pair(Function, Loc));
1755 QueuedInstantiation = true;
1760 // If some prior declaration of this function was a friend with an
1761 // uninstantiated definition, reject it.
1762 if (R->getFriendObjectKind()) {
1763 if (const FunctionDecl *RPattern =
1764 R->getTemplateInstantiationPattern()) {
1765 if (RPattern->isDefined(RPattern)) {
1766 SemaRef.Diag(Function->getLocation(), diag::err_redefinition)
1767 << Function->getDeclName();
1768 SemaRef.Diag(R->getLocation(), diag::note_previous_definition);
1777 if (Function->isLocalExternDecl() && !Function->getPreviousDecl())
1778 DC->makeDeclVisibleInContext(PrincipalDecl);
1780 if (Function->isOverloadedOperator() && !DC->isRecord() &&
1781 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary))
1782 PrincipalDecl->setNonMemberOperator();
1784 assert(!D->isDefaulted() && "only methods should be defaulted");
1789 TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D,
1790 TemplateParameterList *TemplateParams,
1791 bool IsClassScopeSpecialization) {
1792 FunctionTemplateDecl *FunctionTemplate = D->getDescribedFunctionTemplate();
1793 if (FunctionTemplate && !TemplateParams) {
1794 // We are creating a function template specialization from a function
1795 // template. Check whether there is already a function template
1796 // specialization for this particular set of template arguments.
1797 ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
1799 void *InsertPos = nullptr;
1800 FunctionDecl *SpecFunc
1801 = FunctionTemplate->findSpecialization(Innermost, InsertPos);
1803 // If we already have a function template specialization, return it.
1809 if (FunctionTemplate)
1810 isFriend = (FunctionTemplate->getFriendObjectKind() != Decl::FOK_None);
1812 isFriend = (D->getFriendObjectKind() != Decl::FOK_None);
1814 bool MergeWithParentScope = (TemplateParams != nullptr) ||
1815 !(isa<Decl>(Owner) &&
1816 cast<Decl>(Owner)->isDefinedOutsideFunctionOrMethod());
1817 LocalInstantiationScope Scope(SemaRef, MergeWithParentScope);
1819 // Instantiate enclosing template arguments for friends.
1820 SmallVector<TemplateParameterList *, 4> TempParamLists;
1821 unsigned NumTempParamLists = 0;
1822 if (isFriend && (NumTempParamLists = D->getNumTemplateParameterLists())) {
1823 TempParamLists.resize(NumTempParamLists);
1824 for (unsigned I = 0; I != NumTempParamLists; ++I) {
1825 TemplateParameterList *TempParams = D->getTemplateParameterList(I);
1826 TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
1829 TempParamLists[I] = InstParams;
1833 SmallVector<ParmVarDecl *, 4> Params;
1834 TypeSourceInfo *TInfo = SubstFunctionType(D, Params);
1837 QualType T = adjustFunctionTypeForInstantiation(SemaRef.Context, D, TInfo);
1839 NestedNameSpecifierLoc QualifierLoc = D->getQualifierLoc();
1841 QualifierLoc = SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc,
1847 DeclContext *DC = Owner;
1851 SS.Adopt(QualifierLoc);
1852 DC = SemaRef.computeDeclContext(SS);
1854 if (DC && SemaRef.RequireCompleteDeclContext(SS, DC))
1857 DC = SemaRef.FindInstantiatedContext(D->getLocation(),
1858 D->getDeclContext(),
1861 if (!DC) return nullptr;
1864 // Build the instantiated method declaration.
1865 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC);
1866 CXXMethodDecl *Method = nullptr;
1868 SourceLocation StartLoc = D->getInnerLocStart();
1869 DeclarationNameInfo NameInfo
1870 = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs);
1871 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(D)) {
1872 Method = CXXConstructorDecl::Create(SemaRef.Context, Record,
1873 StartLoc, NameInfo, T, TInfo,
1874 Constructor->isExplicit(),
1875 Constructor->isInlineSpecified(),
1876 false, Constructor->isConstexpr());
1877 Method->setRangeEnd(Constructor->getLocEnd());
1878 } else if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(D)) {
1879 Method = CXXDestructorDecl::Create(SemaRef.Context, Record,
1880 StartLoc, NameInfo, T, TInfo,
1881 Destructor->isInlineSpecified(),
1883 Method->setRangeEnd(Destructor->getLocEnd());
1884 } else if (CXXConversionDecl *Conversion = dyn_cast<CXXConversionDecl>(D)) {
1885 Method = CXXConversionDecl::Create(SemaRef.Context, Record,
1886 StartLoc, NameInfo, T, TInfo,
1887 Conversion->isInlineSpecified(),
1888 Conversion->isExplicit(),
1889 Conversion->isConstexpr(),
1890 Conversion->getLocEnd());
1892 StorageClass SC = D->isStatic() ? SC_Static : SC_None;
1893 Method = CXXMethodDecl::Create(SemaRef.Context, Record,
1894 StartLoc, NameInfo, T, TInfo,
1895 SC, D->isInlineSpecified(),
1896 D->isConstexpr(), D->getLocEnd());
1900 Method->setImplicitlyInline();
1903 Method->setQualifierInfo(QualifierLoc);
1905 if (TemplateParams) {
1906 // Our resulting instantiation is actually a function template, since we
1907 // are substituting only the outer template parameters. For example, given
1909 // template<typename T>
1911 // template<typename U> void f(T, U);
1916 // We are instantiating the member template "f" within X<int>, which means
1917 // substituting int for T, but leaving "f" as a member function template.
1918 // Build the function template itself.
1919 FunctionTemplate = FunctionTemplateDecl::Create(SemaRef.Context, Record,
1920 Method->getLocation(),
1921 Method->getDeclName(),
1922 TemplateParams, Method);
1924 FunctionTemplate->setLexicalDeclContext(Owner);
1925 FunctionTemplate->setObjectOfFriendDecl();
1926 } else if (D->isOutOfLine())
1927 FunctionTemplate->setLexicalDeclContext(D->getLexicalDeclContext());
1928 Method->setDescribedFunctionTemplate(FunctionTemplate);
1929 } else if (FunctionTemplate) {
1930 // Record this function template specialization.
1931 ArrayRef<TemplateArgument> Innermost = TemplateArgs.getInnermost();
1932 Method->setFunctionTemplateSpecialization(FunctionTemplate,
1933 TemplateArgumentList::CreateCopy(SemaRef.Context,
1935 /*InsertPos=*/nullptr);
1936 } else if (!isFriend) {
1937 // Record that this is an instantiation of a member function.
1938 Method->setInstantiationOfMemberFunction(D, TSK_ImplicitInstantiation);
1941 // If we are instantiating a member function defined
1942 // out-of-line, the instantiation will have the same lexical
1943 // context (which will be a namespace scope) as the template.
1945 if (NumTempParamLists)
1946 Method->setTemplateParameterListsInfo(
1948 llvm::makeArrayRef(TempParamLists.data(), NumTempParamLists));
1950 Method->setLexicalDeclContext(Owner);
1951 Method->setObjectOfFriendDecl();
1952 } else if (D->isOutOfLine())
1953 Method->setLexicalDeclContext(D->getLexicalDeclContext());
1955 // Attach the parameters
1956 for (unsigned P = 0; P < Params.size(); ++P)
1957 Params[P]->setOwningFunction(Method);
1958 Method->setParams(Params);
1960 if (InitMethodInstantiation(Method, D))
1961 Method->setInvalidDecl();
1963 LookupResult Previous(SemaRef, NameInfo, Sema::LookupOrdinaryName,
1964 Sema::ForRedeclaration);
1966 if (!FunctionTemplate || TemplateParams || isFriend) {
1967 SemaRef.LookupQualifiedName(Previous, Record);
1969 // In C++, the previous declaration we find might be a tag type
1970 // (class or enum). In this case, the new declaration will hide the
1971 // tag type. Note that this does does not apply if we're declaring a
1972 // typedef (C++ [dcl.typedef]p4).
1973 if (Previous.isSingleTagDecl())
1977 if (!IsClassScopeSpecialization)
1978 SemaRef.CheckFunctionDeclaration(nullptr, Method, Previous, false);
1981 SemaRef.CheckPureMethod(Method, SourceRange());
1983 // Propagate access. For a non-friend declaration, the access is
1984 // whatever we're propagating from. For a friend, it should be the
1985 // previous declaration we just found.
1986 if (isFriend && Method->getPreviousDecl())
1987 Method->setAccess(Method->getPreviousDecl()->getAccess());
1989 Method->setAccess(D->getAccess());
1990 if (FunctionTemplate)
1991 FunctionTemplate->setAccess(Method->getAccess());
1993 SemaRef.CheckOverrideControl(Method);
1995 // If a function is defined as defaulted or deleted, mark it as such now.
1996 if (D->isExplicitlyDefaulted())
1997 SemaRef.SetDeclDefaulted(Method, Method->getLocation());
1998 if (D->isDeletedAsWritten())
1999 SemaRef.SetDeclDeleted(Method, Method->getLocation());
2001 // If there's a function template, let our caller handle it.
2002 if (FunctionTemplate) {
2005 // Don't hide a (potentially) valid declaration with an invalid one.
2006 } else if (Method->isInvalidDecl() && !Previous.empty()) {
2009 // Otherwise, check access to friends and make them visible.
2010 } else if (isFriend) {
2011 // We only need to re-check access for methods which we didn't
2012 // manage to match during parsing.
2013 if (!D->getPreviousDecl())
2014 SemaRef.CheckFriendAccess(Method);
2016 Record->makeDeclVisibleInContext(Method);
2018 // Otherwise, add the declaration. We don't need to do this for
2019 // class-scope specializations because we'll have matched them with
2020 // the appropriate template.
2021 } else if (!IsClassScopeSpecialization) {
2022 Owner->addDecl(Method);
2028 Decl *TemplateDeclInstantiator::VisitCXXConstructorDecl(CXXConstructorDecl *D) {
2029 return VisitCXXMethodDecl(D);
2032 Decl *TemplateDeclInstantiator::VisitCXXDestructorDecl(CXXDestructorDecl *D) {
2033 return VisitCXXMethodDecl(D);
2036 Decl *TemplateDeclInstantiator::VisitCXXConversionDecl(CXXConversionDecl *D) {
2037 return VisitCXXMethodDecl(D);
2040 Decl *TemplateDeclInstantiator::VisitParmVarDecl(ParmVarDecl *D) {
2041 return SemaRef.SubstParmVarDecl(D, TemplateArgs, /*indexAdjustment*/ 0, None,
2042 /*ExpectParameterPack=*/ false);
2045 Decl *TemplateDeclInstantiator::VisitTemplateTypeParmDecl(
2046 TemplateTypeParmDecl *D) {
2047 // TODO: don't always clone when decls are refcounted.
2048 assert(D->getTypeForDecl()->isTemplateTypeParmType());
2050 TemplateTypeParmDecl *Inst =
2051 TemplateTypeParmDecl::Create(SemaRef.Context, Owner,
2052 D->getLocStart(), D->getLocation(),
2053 D->getDepth() - TemplateArgs.getNumLevels(),
2054 D->getIndex(), D->getIdentifier(),
2055 D->wasDeclaredWithTypename(),
2056 D->isParameterPack());
2057 Inst->setAccess(AS_public);
2059 if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited()) {
2060 TypeSourceInfo *InstantiatedDefaultArg =
2061 SemaRef.SubstType(D->getDefaultArgumentInfo(), TemplateArgs,
2062 D->getDefaultArgumentLoc(), D->getDeclName());
2063 if (InstantiatedDefaultArg)
2064 Inst->setDefaultArgument(InstantiatedDefaultArg);
2067 // Introduce this template parameter's instantiation into the instantiation
2069 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Inst);
2074 Decl *TemplateDeclInstantiator::VisitNonTypeTemplateParmDecl(
2075 NonTypeTemplateParmDecl *D) {
2076 // Substitute into the type of the non-type template parameter.
2077 TypeLoc TL = D->getTypeSourceInfo()->getTypeLoc();
2078 SmallVector<TypeSourceInfo *, 4> ExpandedParameterPackTypesAsWritten;
2079 SmallVector<QualType, 4> ExpandedParameterPackTypes;
2080 bool IsExpandedParameterPack = false;
2083 bool Invalid = false;
2085 if (D->isExpandedParameterPack()) {
2086 // The non-type template parameter pack is an already-expanded pack
2087 // expansion of types. Substitute into each of the expanded types.
2088 ExpandedParameterPackTypes.reserve(D->getNumExpansionTypes());
2089 ExpandedParameterPackTypesAsWritten.reserve(D->getNumExpansionTypes());
2090 for (unsigned I = 0, N = D->getNumExpansionTypes(); I != N; ++I) {
2091 TypeSourceInfo *NewDI =
2092 SemaRef.SubstType(D->getExpansionTypeSourceInfo(I), TemplateArgs,
2093 D->getLocation(), D->getDeclName());
2098 SemaRef.CheckNonTypeTemplateParameterType(NewDI, D->getLocation());
2102 ExpandedParameterPackTypesAsWritten.push_back(NewDI);
2103 ExpandedParameterPackTypes.push_back(NewT);
2106 IsExpandedParameterPack = true;
2107 DI = D->getTypeSourceInfo();
2109 } else if (D->isPackExpansion()) {
2110 // The non-type template parameter pack's type is a pack expansion of types.
2111 // Determine whether we need to expand this parameter pack into separate
2113 PackExpansionTypeLoc Expansion = TL.castAs<PackExpansionTypeLoc>();
2114 TypeLoc Pattern = Expansion.getPatternLoc();
2115 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
2116 SemaRef.collectUnexpandedParameterPacks(Pattern, Unexpanded);
2118 // Determine whether the set of unexpanded parameter packs can and should
2121 bool RetainExpansion = false;
2122 Optional<unsigned> OrigNumExpansions
2123 = Expansion.getTypePtr()->getNumExpansions();
2124 Optional<unsigned> NumExpansions = OrigNumExpansions;
2125 if (SemaRef.CheckParameterPacksForExpansion(Expansion.getEllipsisLoc(),
2126 Pattern.getSourceRange(),
2129 Expand, RetainExpansion,
2134 for (unsigned I = 0; I != *NumExpansions; ++I) {
2135 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I);
2136 TypeSourceInfo *NewDI = SemaRef.SubstType(Pattern, TemplateArgs,
2143 SemaRef.CheckNonTypeTemplateParameterType(NewDI, D->getLocation());
2147 ExpandedParameterPackTypesAsWritten.push_back(NewDI);
2148 ExpandedParameterPackTypes.push_back(NewT);
2151 // Note that we have an expanded parameter pack. The "type" of this
2152 // expanded parameter pack is the original expansion type, but callers
2153 // will end up using the expanded parameter pack types for type-checking.
2154 IsExpandedParameterPack = true;
2155 DI = D->getTypeSourceInfo();
2158 // We cannot fully expand the pack expansion now, so substitute into the
2159 // pattern and create a new pack expansion type.
2160 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1);
2161 TypeSourceInfo *NewPattern = SemaRef.SubstType(Pattern, TemplateArgs,
2167 SemaRef.CheckNonTypeTemplateParameterType(NewPattern, D->getLocation());
2168 DI = SemaRef.CheckPackExpansion(NewPattern, Expansion.getEllipsisLoc(),
2176 // Simple case: substitution into a parameter that is not a parameter pack.
2177 DI = SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs,
2178 D->getLocation(), D->getDeclName());
2182 // Check that this type is acceptable for a non-type template parameter.
2183 T = SemaRef.CheckNonTypeTemplateParameterType(DI, D->getLocation());
2185 T = SemaRef.Context.IntTy;
2190 NonTypeTemplateParmDecl *Param;
2191 if (IsExpandedParameterPack)
2192 Param = NonTypeTemplateParmDecl::Create(
2193 SemaRef.Context, Owner, D->getInnerLocStart(), D->getLocation(),
2194 D->getDepth() - TemplateArgs.getNumLevels(), D->getPosition(),
2195 D->getIdentifier(), T, DI, ExpandedParameterPackTypes,
2196 ExpandedParameterPackTypesAsWritten);
2198 Param = NonTypeTemplateParmDecl::Create(SemaRef.Context, Owner,
2199 D->getInnerLocStart(),
2201 D->getDepth() - TemplateArgs.getNumLevels(),
2203 D->getIdentifier(), T,
2204 D->isParameterPack(), DI);
2206 Param->setAccess(AS_public);
2208 Param->setInvalidDecl();
2210 if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited()) {
2211 EnterExpressionEvaluationContext ConstantEvaluated(SemaRef,
2212 Sema::ConstantEvaluated);
2213 ExprResult Value = SemaRef.SubstExpr(D->getDefaultArgument(), TemplateArgs);
2214 if (!Value.isInvalid())
2215 Param->setDefaultArgument(Value.get());
2218 // Introduce this template parameter's instantiation into the instantiation
2220 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
2224 static void collectUnexpandedParameterPacks(
2226 TemplateParameterList *Params,
2227 SmallVectorImpl<UnexpandedParameterPack> &Unexpanded) {
2228 for (const auto &P : *Params) {
2229 if (P->isTemplateParameterPack())
2231 if (NonTypeTemplateParmDecl *NTTP = dyn_cast<NonTypeTemplateParmDecl>(P))
2232 S.collectUnexpandedParameterPacks(NTTP->getTypeSourceInfo()->getTypeLoc(),
2234 if (TemplateTemplateParmDecl *TTP = dyn_cast<TemplateTemplateParmDecl>(P))
2235 collectUnexpandedParameterPacks(S, TTP->getTemplateParameters(),
2241 TemplateDeclInstantiator::VisitTemplateTemplateParmDecl(
2242 TemplateTemplateParmDecl *D) {
2243 // Instantiate the template parameter list of the template template parameter.
2244 TemplateParameterList *TempParams = D->getTemplateParameters();
2245 TemplateParameterList *InstParams;
2246 SmallVector<TemplateParameterList*, 8> ExpandedParams;
2248 bool IsExpandedParameterPack = false;
2250 if (D->isExpandedParameterPack()) {
2251 // The template template parameter pack is an already-expanded pack
2252 // expansion of template parameters. Substitute into each of the expanded
2254 ExpandedParams.reserve(D->getNumExpansionTemplateParameters());
2255 for (unsigned I = 0, N = D->getNumExpansionTemplateParameters();
2257 LocalInstantiationScope Scope(SemaRef);
2258 TemplateParameterList *Expansion =
2259 SubstTemplateParams(D->getExpansionTemplateParameters(I));
2262 ExpandedParams.push_back(Expansion);
2265 IsExpandedParameterPack = true;
2266 InstParams = TempParams;
2267 } else if (D->isPackExpansion()) {
2268 // The template template parameter pack expands to a pack of template
2269 // template parameters. Determine whether we need to expand this parameter
2270 // pack into separate parameters.
2271 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
2272 collectUnexpandedParameterPacks(SemaRef, D->getTemplateParameters(),
2275 // Determine whether the set of unexpanded parameter packs can and should
2278 bool RetainExpansion = false;
2279 Optional<unsigned> NumExpansions;
2280 if (SemaRef.CheckParameterPacksForExpansion(D->getLocation(),
2281 TempParams->getSourceRange(),
2284 Expand, RetainExpansion,
2289 for (unsigned I = 0; I != *NumExpansions; ++I) {
2290 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I);
2291 LocalInstantiationScope Scope(SemaRef);
2292 TemplateParameterList *Expansion = SubstTemplateParams(TempParams);
2295 ExpandedParams.push_back(Expansion);
2298 // Note that we have an expanded parameter pack. The "type" of this
2299 // expanded parameter pack is the original expansion type, but callers
2300 // will end up using the expanded parameter pack types for type-checking.
2301 IsExpandedParameterPack = true;
2302 InstParams = TempParams;
2304 // We cannot fully expand the pack expansion now, so just substitute
2305 // into the pattern.
2306 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1);
2308 LocalInstantiationScope Scope(SemaRef);
2309 InstParams = SubstTemplateParams(TempParams);
2314 // Perform the actual substitution of template parameters within a new,
2315 // local instantiation scope.
2316 LocalInstantiationScope Scope(SemaRef);
2317 InstParams = SubstTemplateParams(TempParams);
2322 // Build the template template parameter.
2323 TemplateTemplateParmDecl *Param;
2324 if (IsExpandedParameterPack)
2325 Param = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner,
2327 D->getDepth() - TemplateArgs.getNumLevels(),
2329 D->getIdentifier(), InstParams,
2332 Param = TemplateTemplateParmDecl::Create(SemaRef.Context, Owner,
2334 D->getDepth() - TemplateArgs.getNumLevels(),
2336 D->isParameterPack(),
2337 D->getIdentifier(), InstParams);
2338 if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited()) {
2339 NestedNameSpecifierLoc QualifierLoc =
2340 D->getDefaultArgument().getTemplateQualifierLoc();
2342 SemaRef.SubstNestedNameSpecifierLoc(QualifierLoc, TemplateArgs);
2343 TemplateName TName = SemaRef.SubstTemplateName(
2344 QualifierLoc, D->getDefaultArgument().getArgument().getAsTemplate(),
2345 D->getDefaultArgument().getTemplateNameLoc(), TemplateArgs);
2346 if (!TName.isNull())
2347 Param->setDefaultArgument(
2349 TemplateArgumentLoc(TemplateArgument(TName),
2350 D->getDefaultArgument().getTemplateQualifierLoc(),
2351 D->getDefaultArgument().getTemplateNameLoc()));
2353 Param->setAccess(AS_public);
2355 // Introduce this template parameter's instantiation into the instantiation
2357 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, Param);
2362 Decl *TemplateDeclInstantiator::VisitUsingDirectiveDecl(UsingDirectiveDecl *D) {
2363 // Using directives are never dependent (and never contain any types or
2364 // expressions), so they require no explicit instantiation work.
2366 UsingDirectiveDecl *Inst
2367 = UsingDirectiveDecl::Create(SemaRef.Context, Owner, D->getLocation(),
2368 D->getNamespaceKeyLocation(),
2369 D->getQualifierLoc(),
2370 D->getIdentLocation(),
2371 D->getNominatedNamespace(),
2372 D->getCommonAncestor());
2374 // Add the using directive to its declaration context
2375 // only if this is not a function or method.
2376 if (!Owner->isFunctionOrMethod())
2377 Owner->addDecl(Inst);
2382 Decl *TemplateDeclInstantiator::VisitUsingDecl(UsingDecl *D) {
2384 // The nested name specifier may be dependent, for example
2385 // template <typename T> struct t {
2386 // struct s1 { T f1(); };
2387 // struct s2 : s1 { using s1::f1; };
2389 // template struct t<int>;
2390 // Here, in using s1::f1, s1 refers to t<T>::s1;
2391 // we need to substitute for t<int>::s1.
2392 NestedNameSpecifierLoc QualifierLoc
2393 = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(),
2398 // For an inheriting constructor declaration, the name of the using
2399 // declaration is the name of a constructor in this class, not in the
2401 DeclarationNameInfo NameInfo = D->getNameInfo();
2402 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName)
2403 if (auto *RD = dyn_cast<CXXRecordDecl>(SemaRef.CurContext))
2404 NameInfo.setName(SemaRef.Context.DeclarationNames.getCXXConstructorName(
2405 SemaRef.Context.getCanonicalType(SemaRef.Context.getRecordType(RD))));
2407 // We only need to do redeclaration lookups if we're in a class
2408 // scope (in fact, it's not really even possible in non-class
2410 bool CheckRedeclaration = Owner->isRecord();
2412 LookupResult Prev(SemaRef, NameInfo, Sema::LookupUsingDeclName,
2413 Sema::ForRedeclaration);
2415 UsingDecl *NewUD = UsingDecl::Create(SemaRef.Context, Owner,
2422 SS.Adopt(QualifierLoc);
2423 if (CheckRedeclaration) {
2424 Prev.setHideTags(false);
2425 SemaRef.LookupQualifiedName(Prev, Owner);
2427 // Check for invalid redeclarations.
2428 if (SemaRef.CheckUsingDeclRedeclaration(D->getUsingLoc(),
2429 D->hasTypename(), SS,
2430 D->getLocation(), Prev))
2431 NewUD->setInvalidDecl();
2435 if (!NewUD->isInvalidDecl() &&
2436 SemaRef.CheckUsingDeclQualifier(D->getUsingLoc(), D->hasTypename(),
2437 SS, NameInfo, D->getLocation()))
2438 NewUD->setInvalidDecl();
2440 SemaRef.Context.setInstantiatedFromUsingDecl(NewUD, D);
2441 NewUD->setAccess(D->getAccess());
2442 Owner->addDecl(NewUD);
2444 // Don't process the shadow decls for an invalid decl.
2445 if (NewUD->isInvalidDecl())
2448 if (NameInfo.getName().getNameKind() == DeclarationName::CXXConstructorName)
2449 SemaRef.CheckInheritingConstructorUsingDecl(NewUD);
2451 bool isFunctionScope = Owner->isFunctionOrMethod();
2453 // Process the shadow decls.
2454 for (auto *Shadow : D->shadows()) {
2455 // FIXME: UsingShadowDecl doesn't preserve its immediate target, so
2456 // reconstruct it in the case where it matters.
2457 NamedDecl *OldTarget = Shadow->getTargetDecl();
2458 if (auto *CUSD = dyn_cast<ConstructorUsingShadowDecl>(Shadow))
2459 if (auto *BaseShadow = CUSD->getNominatedBaseClassShadowDecl())
2460 OldTarget = BaseShadow;
2462 NamedDecl *InstTarget =
2463 cast_or_null<NamedDecl>(SemaRef.FindInstantiatedDecl(
2464 Shadow->getLocation(), OldTarget, TemplateArgs));
2468 UsingShadowDecl *PrevDecl = nullptr;
2469 if (CheckRedeclaration) {
2470 if (SemaRef.CheckUsingShadowDecl(NewUD, InstTarget, Prev, PrevDecl))
2472 } else if (UsingShadowDecl *OldPrev =
2473 getPreviousDeclForInstantiation(Shadow)) {
2474 PrevDecl = cast_or_null<UsingShadowDecl>(SemaRef.FindInstantiatedDecl(
2475 Shadow->getLocation(), OldPrev, TemplateArgs));
2478 UsingShadowDecl *InstShadow =
2479 SemaRef.BuildUsingShadowDecl(/*Scope*/nullptr, NewUD, InstTarget,
2481 SemaRef.Context.setInstantiatedFromUsingShadowDecl(InstShadow, Shadow);
2483 if (isFunctionScope)
2484 SemaRef.CurrentInstantiationScope->InstantiatedLocal(Shadow, InstShadow);
2490 Decl *TemplateDeclInstantiator::VisitUsingShadowDecl(UsingShadowDecl *D) {
2491 // Ignore these; we handle them in bulk when processing the UsingDecl.
2495 Decl *TemplateDeclInstantiator::VisitConstructorUsingShadowDecl(
2496 ConstructorUsingShadowDecl *D) {
2497 // Ignore these; we handle them in bulk when processing the UsingDecl.
2501 template <typename T>
2502 Decl *TemplateDeclInstantiator::instantiateUnresolvedUsingDecl(
2503 T *D, bool InstantiatingPackElement) {
2504 // If this is a pack expansion, expand it now.
2505 if (D->isPackExpansion() && !InstantiatingPackElement) {
2506 SmallVector<UnexpandedParameterPack, 2> Unexpanded;
2507 SemaRef.collectUnexpandedParameterPacks(D->getQualifierLoc(), Unexpanded);
2508 SemaRef.collectUnexpandedParameterPacks(D->getNameInfo(), Unexpanded);
2510 // Determine whether the set of unexpanded parameter packs can and should
2513 bool RetainExpansion = false;
2514 Optional<unsigned> NumExpansions;
2515 if (SemaRef.CheckParameterPacksForExpansion(
2516 D->getEllipsisLoc(), D->getSourceRange(), Unexpanded, TemplateArgs,
2517 Expand, RetainExpansion, NumExpansions))
2520 // This declaration cannot appear within a function template signature,
2521 // so we can't have a partial argument list for a parameter pack.
2522 assert(!RetainExpansion &&
2523 "should never need to retain an expansion for UsingPackDecl");
2526 // We cannot fully expand the pack expansion now, so substitute into the
2527 // pattern and create a new pack expansion.
2528 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, -1);
2529 return instantiateUnresolvedUsingDecl(D, true);
2532 // Within a function, we don't have any normal way to check for conflicts
2533 // between shadow declarations from different using declarations in the
2534 // same pack expansion, but this is always ill-formed because all expansions
2535 // must produce (conflicting) enumerators.
2537 // Sadly we can't just reject this in the template definition because it
2538 // could be valid if the pack is empty or has exactly one expansion.
2539 if (D->getDeclContext()->isFunctionOrMethod() && *NumExpansions > 1) {
2540 SemaRef.Diag(D->getEllipsisLoc(),
2541 diag::err_using_decl_redeclaration_expansion);
2545 // Instantiate the slices of this pack and build a UsingPackDecl.
2546 SmallVector<NamedDecl*, 8> Expansions;
2547 for (unsigned I = 0; I != *NumExpansions; ++I) {
2548 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(SemaRef, I);
2549 Decl *Slice = instantiateUnresolvedUsingDecl(D, true);
2552 // Note that we can still get unresolved using declarations here, if we
2553 // had arguments for all packs but the pattern also contained other
2554 // template arguments (this only happens during partial substitution, eg
2555 // into the body of a generic lambda in a function template).
2556 Expansions.push_back(cast<NamedDecl>(Slice));
2559 auto *NewD = SemaRef.BuildUsingPackDecl(D, Expansions);
2560 if (isDeclWithinFunction(D))
2561 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, NewD);
2565 UnresolvedUsingTypenameDecl *TD = dyn_cast<UnresolvedUsingTypenameDecl>(D);
2566 SourceLocation TypenameLoc = TD ? TD->getTypenameLoc() : SourceLocation();
2568 NestedNameSpecifierLoc QualifierLoc
2569 = SemaRef.SubstNestedNameSpecifierLoc(D->getQualifierLoc(),
2575 SS.Adopt(QualifierLoc);
2577 DeclarationNameInfo NameInfo
2578 = SemaRef.SubstDeclarationNameInfo(D->getNameInfo(), TemplateArgs);
2580 // Produce a pack expansion only if we're not instantiating a particular
2581 // slice of a pack expansion.
2582 bool InstantiatingSlice = D->getEllipsisLoc().isValid() &&
2583 SemaRef.ArgumentPackSubstitutionIndex != -1;
2584 SourceLocation EllipsisLoc =
2585 InstantiatingSlice ? SourceLocation() : D->getEllipsisLoc();
2587 NamedDecl *UD = SemaRef.BuildUsingDeclaration(
2588 /*Scope*/ nullptr, D->getAccess(), D->getUsingLoc(),
2589 /*HasTypename*/ TD, TypenameLoc, SS, NameInfo, EllipsisLoc, nullptr,
2590 /*IsInstantiation*/ true);
2592 SemaRef.Context.setInstantiatedFromUsingDecl(UD, D);
2597 Decl *TemplateDeclInstantiator::VisitUnresolvedUsingTypenameDecl(
2598 UnresolvedUsingTypenameDecl *D) {
2599 return instantiateUnresolvedUsingDecl(D);
2602 Decl *TemplateDeclInstantiator::VisitUnresolvedUsingValueDecl(
2603 UnresolvedUsingValueDecl *D) {
2604 return instantiateUnresolvedUsingDecl(D);
2607 Decl *TemplateDeclInstantiator::VisitUsingPackDecl(UsingPackDecl *D) {
2608 SmallVector<NamedDecl*, 8> Expansions;
2609 for (auto *UD : D->expansions()) {
2611 SemaRef.FindInstantiatedDecl(D->getLocation(), UD, TemplateArgs))
2612 Expansions.push_back(cast<NamedDecl>(NewUD));
2617 auto *NewD = SemaRef.BuildUsingPackDecl(D, Expansions);
2618 if (isDeclWithinFunction(D))
2619 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, NewD);
2623 Decl *TemplateDeclInstantiator::VisitClassScopeFunctionSpecializationDecl(
2624 ClassScopeFunctionSpecializationDecl *Decl) {
2625 CXXMethodDecl *OldFD = Decl->getSpecialization();
2626 CXXMethodDecl *NewFD =
2627 cast_or_null<CXXMethodDecl>(VisitCXXMethodDecl(OldFD, nullptr, true));
2631 LookupResult Previous(SemaRef, NewFD->getNameInfo(), Sema::LookupOrdinaryName,
2632 Sema::ForRedeclaration);
2634 TemplateArgumentListInfo TemplateArgs;
2635 TemplateArgumentListInfo *TemplateArgsPtr = nullptr;
2636 if (Decl->hasExplicitTemplateArgs()) {
2637 TemplateArgs = Decl->templateArgs();
2638 TemplateArgsPtr = &TemplateArgs;
2641 SemaRef.LookupQualifiedName(Previous, SemaRef.CurContext);
2642 if (SemaRef.CheckFunctionTemplateSpecialization(NewFD, TemplateArgsPtr,
2644 NewFD->setInvalidDecl();
2648 // Associate the specialization with the pattern.
2649 FunctionDecl *Specialization = cast<FunctionDecl>(Previous.getFoundDecl());
2650 assert(Specialization && "Class scope Specialization is null");
2651 SemaRef.Context.setClassScopeSpecializationPattern(Specialization, OldFD);
2656 Decl *TemplateDeclInstantiator::VisitOMPThreadPrivateDecl(
2657 OMPThreadPrivateDecl *D) {
2658 SmallVector<Expr *, 5> Vars;
2659 for (auto *I : D->varlists()) {
2660 Expr *Var = SemaRef.SubstExpr(I, TemplateArgs).get();
2661 assert(isa<DeclRefExpr>(Var) && "threadprivate arg is not a DeclRefExpr");
2662 Vars.push_back(Var);
2665 OMPThreadPrivateDecl *TD =
2666 SemaRef.CheckOMPThreadPrivateDecl(D->getLocation(), Vars);
2668 TD->setAccess(AS_public);
2674 Decl *TemplateDeclInstantiator::VisitOMPDeclareReductionDecl(
2675 OMPDeclareReductionDecl *D) {
2676 // Instantiate type and check if it is allowed.
2677 QualType SubstReductionType = SemaRef.ActOnOpenMPDeclareReductionType(
2679 ParsedType::make(SemaRef.SubstType(D->getType(), TemplateArgs,
2680 D->getLocation(), DeclarationName())));
2681 if (SubstReductionType.isNull())
2683 bool IsCorrect = !SubstReductionType.isNull();
2684 // Create instantiated copy.
2685 std::pair<QualType, SourceLocation> ReductionTypes[] = {
2686 std::make_pair(SubstReductionType, D->getLocation())};
2687 auto *PrevDeclInScope = D->getPrevDeclInScope();
2688 if (PrevDeclInScope && !PrevDeclInScope->isInvalidDecl()) {
2689 PrevDeclInScope = cast<OMPDeclareReductionDecl>(
2690 SemaRef.CurrentInstantiationScope->findInstantiationOf(PrevDeclInScope)
2693 auto DRD = SemaRef.ActOnOpenMPDeclareReductionDirectiveStart(
2694 /*S=*/nullptr, Owner, D->getDeclName(), ReductionTypes, D->getAccess(),
2696 auto *NewDRD = cast<OMPDeclareReductionDecl>(DRD.get().getSingleDecl());
2697 if (isDeclWithinFunction(NewDRD))
2698 SemaRef.CurrentInstantiationScope->InstantiatedLocal(D, NewDRD);
2699 Expr *SubstCombiner = nullptr;
2700 Expr *SubstInitializer = nullptr;
2701 // Combiners instantiation sequence.
2702 if (D->getCombiner()) {
2703 SemaRef.ActOnOpenMPDeclareReductionCombinerStart(
2704 /*S=*/nullptr, NewDRD);
2705 const char *Names[] = {"omp_in", "omp_out"};
2706 for (auto &Name : Names) {
2707 DeclarationName DN(&SemaRef.Context.Idents.get(Name));
2708 auto OldLookup = D->lookup(DN);
2709 auto Lookup = NewDRD->lookup(DN);
2710 if (!OldLookup.empty() && !Lookup.empty()) {
2711 assert(Lookup.size() == 1 && OldLookup.size() == 1);
2712 SemaRef.CurrentInstantiationScope->InstantiatedLocal(OldLookup.front(),
2716 SubstCombiner = SemaRef.SubstExpr(D->getCombiner(), TemplateArgs).get();
2717 SemaRef.ActOnOpenMPDeclareReductionCombinerEnd(NewDRD, SubstCombiner);
2718 // Initializers instantiation sequence.
2719 if (D->getInitializer()) {
2720 SemaRef.ActOnOpenMPDeclareReductionInitializerStart(
2721 /*S=*/nullptr, NewDRD);
2722 const char *Names[] = {"omp_orig", "omp_priv"};
2723 for (auto &Name : Names) {
2724 DeclarationName DN(&SemaRef.Context.Idents.get(Name));
2725 auto OldLookup = D->lookup(DN);
2726 auto Lookup = NewDRD->lookup(DN);
2727 if (!OldLookup.empty() && !Lookup.empty()) {
2728 assert(Lookup.size() == 1 && OldLookup.size() == 1);
2729 SemaRef.CurrentInstantiationScope->InstantiatedLocal(
2730 OldLookup.front(), Lookup.front());
2734 SemaRef.SubstExpr(D->getInitializer(), TemplateArgs).get();
2735 SemaRef.ActOnOpenMPDeclareReductionInitializerEnd(NewDRD,
2738 IsCorrect = IsCorrect && SubstCombiner &&
2739 (!D->getInitializer() || SubstInitializer);
2743 (void)SemaRef.ActOnOpenMPDeclareReductionDirectiveEnd(/*S=*/nullptr, DRD,
2749 Decl *TemplateDeclInstantiator::VisitOMPCapturedExprDecl(
2750 OMPCapturedExprDecl * /*D*/) {
2751 llvm_unreachable("Should not be met in templates");
2754 Decl *TemplateDeclInstantiator::VisitFunctionDecl(FunctionDecl *D) {
2755 return VisitFunctionDecl(D, nullptr);
2758 Decl *TemplateDeclInstantiator::VisitCXXMethodDecl(CXXMethodDecl *D) {
2759 return VisitCXXMethodDecl(D, nullptr);
2762 Decl *TemplateDeclInstantiator::VisitRecordDecl(RecordDecl *D) {
2763 llvm_unreachable("There are only CXXRecordDecls in C++");
2767 TemplateDeclInstantiator::VisitClassTemplateSpecializationDecl(
2768 ClassTemplateSpecializationDecl *D) {
2769 // As a MS extension, we permit class-scope explicit specialization
2770 // of member class templates.
2771 ClassTemplateDecl *ClassTemplate = D->getSpecializedTemplate();
2772 assert(ClassTemplate->getDeclContext()->isRecord() &&
2773 D->getTemplateSpecializationKind() == TSK_ExplicitSpecialization &&
2774 "can only instantiate an explicit specialization "
2775 "for a member class template");
2777 // Lookup the already-instantiated declaration in the instantiation
2778 // of the class template. FIXME: Diagnose or assert if this fails?
2779 DeclContext::lookup_result Found
2780 = Owner->lookup(ClassTemplate->getDeclName());
2783 ClassTemplateDecl *InstClassTemplate
2784 = dyn_cast<ClassTemplateDecl>(Found.front());
2785 if (!InstClassTemplate)
2788 // Substitute into the template arguments of the class template explicit
2790 TemplateSpecializationTypeLoc Loc = D->getTypeAsWritten()->getTypeLoc().
2791 castAs<TemplateSpecializationTypeLoc>();
2792 TemplateArgumentListInfo InstTemplateArgs(Loc.getLAngleLoc(),
2793 Loc.getRAngleLoc());
2794 SmallVector<TemplateArgumentLoc, 4> ArgLocs;
2795 for (unsigned I = 0; I != Loc.getNumArgs(); ++I)
2796 ArgLocs.push_back(Loc.getArgLoc(I));
2797 if (SemaRef.Subst(ArgLocs.data(), ArgLocs.size(),
2798 InstTemplateArgs, TemplateArgs))
2801 // Check that the template argument list is well-formed for this
2803 SmallVector<TemplateArgument, 4> Converted;
2804 if (SemaRef.CheckTemplateArgumentList(InstClassTemplate,
2811 // Figure out where to insert this class template explicit specialization
2812 // in the member template's set of class template explicit specializations.
2813 void *InsertPos = nullptr;
2814 ClassTemplateSpecializationDecl *PrevDecl =
2815 InstClassTemplate->findSpecialization(Converted, InsertPos);
2817 // Check whether we've already seen a conflicting instantiation of this
2818 // declaration (for instance, if there was a prior implicit instantiation).
2821 SemaRef.CheckSpecializationInstantiationRedecl(D->getLocation(),
2822 D->getSpecializationKind(),
2824 PrevDecl->getSpecializationKind(),
2825 PrevDecl->getPointOfInstantiation(),
2829 // If PrevDecl was a definition and D is also a definition, diagnose.
2830 // This happens in cases like:
2832 // template<typename T, typename U>
2834 // template<typename X> struct Inner;
2835 // template<> struct Inner<T> {};
2836 // template<> struct Inner<U> {};
2839 // Outer<int, int> outer; // error: the explicit specializations of Inner
2840 // // have the same signature.
2841 if (PrevDecl && PrevDecl->getDefinition() &&
2842 D->isThisDeclarationADefinition()) {
2843 SemaRef.Diag(D->getLocation(), diag::err_redefinition) << PrevDecl;
2844 SemaRef.Diag(PrevDecl->getDefinition()->getLocation(),
2845 diag::note_previous_definition);
2849 // Create the class template partial specialization declaration.
2850 ClassTemplateSpecializationDecl *InstD
2851 = ClassTemplateSpecializationDecl::Create(SemaRef.Context,
2860 // Add this partial specialization to the set of class template partial
2863 InstClassTemplate->AddSpecialization(InstD, InsertPos);
2865 // Substitute the nested name specifier, if any.
2866 if (SubstQualifier(D, InstD))
2869 // Build the canonical type that describes the converted template
2870 // arguments of the class template explicit specialization.
2871 QualType CanonType = SemaRef.Context.getTemplateSpecializationType(
2872 TemplateName(InstClassTemplate), Converted,
2873 SemaRef.Context.getRecordType(InstD));
2875 // Build the fully-sugared type for this class template
2876 // specialization as the user wrote in the specialization
2877 // itself. This means that we'll pretty-print the type retrieved
2878 // from the specialization's declaration the way that the user
2879 // actually wrote the specialization, rather than formatting the
2880 // name based on the "canonical" representation used to store the
2881 // template arguments in the specialization.
2882 TypeSourceInfo *WrittenTy = SemaRef.Context.getTemplateSpecializationTypeInfo(
2883 TemplateName(InstClassTemplate), D->getLocation(), InstTemplateArgs,
2886 InstD->setAccess(D->getAccess());
2887 InstD->setInstantiationOfMemberClass(D, TSK_ImplicitInstantiation);
2888 InstD->setSpecializationKind(D->getSpecializationKind());
2889 InstD->setTypeAsWritten(WrittenTy);
2890 InstD->setExternLoc(D->getExternLoc());
2891 InstD->setTemplateKeywordLoc(D->getTemplateKeywordLoc());
2893 Owner->addDecl(InstD);
2895 // Instantiate the members of the class-scope explicit specialization eagerly.
2896 // We don't have support for lazy instantiation of an explicit specialization
2897 // yet, and MSVC eagerly instantiates in this case.
2898 if (D->isThisDeclarationADefinition() &&
2899 SemaRef.InstantiateClass(D->getLocation(), InstD, D, TemplateArgs,
2900 TSK_ImplicitInstantiation,
2907 Decl *TemplateDeclInstantiator::VisitVarTemplateSpecializationDecl(
2908 VarTemplateSpecializationDecl *D) {
2910 TemplateArgumentListInfo VarTemplateArgsInfo;
2911 VarTemplateDecl *VarTemplate = D->getSpecializedTemplate();
2912 assert(VarTemplate &&
2913 "A template specialization without specialized template?");
2915 // Substitute the current template arguments.
2916 const TemplateArgumentListInfo &TemplateArgsInfo = D->getTemplateArgsInfo();
2917 VarTemplateArgsInfo.setLAngleLoc(TemplateArgsInfo.getLAngleLoc());
2918 VarTemplateArgsInfo.setRAngleLoc(TemplateArgsInfo.getRAngleLoc());
2920 if (SemaRef.Subst(TemplateArgsInfo.getArgumentArray(),
2921 TemplateArgsInfo.size(), VarTemplateArgsInfo, TemplateArgs))
2924 // Check that the template argument list is well-formed for this template.
2925 SmallVector<TemplateArgument, 4> Converted;
2926 if (SemaRef.CheckTemplateArgumentList(
2927 VarTemplate, VarTemplate->getLocStart(),
2928 const_cast<TemplateArgumentListInfo &>(VarTemplateArgsInfo), false,
2932 // Find the variable template specialization declaration that
2933 // corresponds to these arguments.
2934 void *InsertPos = nullptr;
2935 if (VarTemplateSpecializationDecl *VarSpec = VarTemplate->findSpecialization(
2936 Converted, InsertPos))
2937 // If we already have a variable template specialization, return it.
2940 return VisitVarTemplateSpecializationDecl(VarTemplate, D, InsertPos,
2941 VarTemplateArgsInfo, Converted);
2944 Decl *TemplateDeclInstantiator::VisitVarTemplateSpecializationDecl(
2945 VarTemplateDecl *VarTemplate, VarDecl *D, void *InsertPos,
2946 const TemplateArgumentListInfo &TemplateArgsInfo,
2947 ArrayRef<TemplateArgument> Converted) {
2949 // Do substitution on the type of the declaration
2950 TypeSourceInfo *DI =
2951 SemaRef.SubstType(D->getTypeSourceInfo(), TemplateArgs,
2952 D->getTypeSpecStartLoc(), D->getDeclName());
2956 if (DI->getType()->isFunctionType()) {
2957 SemaRef.Diag(D->getLocation(), diag::err_variable_instantiates_to_function)
2958 << D->isStaticDataMember() << DI->getType();
2962 // Build the instantiated declaration
2963 VarTemplateSpecializationDecl *Var = VarTemplateSpecializationDecl::Create(
2964 SemaRef.Context, Owner, D->getInnerLocStart(), D->getLocation(),
2965 VarTemplate, DI->getType(), DI, D->getStorageClass(), Converted);
2966 Var->setTemplateArgsInfo(TemplateArgsInfo);
2968 VarTemplate->AddSpecialization(Var, InsertPos);
2970 // Substitute the nested name specifier, if any.
2971 if (SubstQualifier(D, Var))
2974 SemaRef.BuildVariableInstantiation(Var, D, TemplateArgs, LateAttrs,
2975 Owner, StartingScope);
2980 Decl *TemplateDeclInstantiator::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D) {
2981 llvm_unreachable("@defs is not supported in Objective-C++");
2984 Decl *TemplateDeclInstantiator::VisitFriendTemplateDecl(FriendTemplateDecl *D) {
2985 // FIXME: We need to be able to instantiate FriendTemplateDecls.
2986 unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID(
2987 DiagnosticsEngine::Error,
2988 "cannot instantiate %0 yet");
2989 SemaRef.Diag(D->getLocation(), DiagID)
2990 << D->getDeclKindName();
2995 Decl *TemplateDeclInstantiator::VisitDecl(Decl *D) {
2996 llvm_unreachable("Unexpected decl");
2999 Decl *Sema::SubstDecl(Decl *D, DeclContext *Owner,
3000 const MultiLevelTemplateArgumentList &TemplateArgs) {
3001 TemplateDeclInstantiator Instantiator(*this, Owner, TemplateArgs);
3002 if (D->isInvalidDecl())
3005 return Instantiator.Visit(D);
3008 /// \brief Instantiates a nested template parameter list in the current
3009 /// instantiation context.
3011 /// \param L The parameter list to instantiate
3013 /// \returns NULL if there was an error
3014 TemplateParameterList *
3015 TemplateDeclInstantiator::SubstTemplateParams(TemplateParameterList *L) {
3016 // Get errors for all the parameters before bailing out.
3017 bool Invalid = false;
3019 unsigned N = L->size();
3020 typedef SmallVector<NamedDecl *, 8> ParamVector;
3023 for (auto &P : *L) {
3024 NamedDecl *D = cast_or_null<NamedDecl>(Visit(P));
3025 Params.push_back(D);
3026 Invalid = Invalid || !D || D->isInvalidDecl();
3029 // Clean up if we had an error.
3033 // Note: we substitute into associated constraints later
3034 Expr *const UninstantiatedRequiresClause = L->getRequiresClause();
3036 TemplateParameterList *InstL
3037 = TemplateParameterList::Create(SemaRef.Context, L->getTemplateLoc(),
3038 L->getLAngleLoc(), Params,
3040 UninstantiatedRequiresClause);
3044 /// \brief Instantiate the declaration of a class template partial
3047 /// \param ClassTemplate the (instantiated) class template that is partially
3048 // specialized by the instantiation of \p PartialSpec.
3050 /// \param PartialSpec the (uninstantiated) class template partial
3051 /// specialization that we are instantiating.
3053 /// \returns The instantiated partial specialization, if successful; otherwise,
3054 /// NULL to indicate an error.
3055 ClassTemplatePartialSpecializationDecl *
3056 TemplateDeclInstantiator::InstantiateClassTemplatePartialSpecialization(
3057 ClassTemplateDecl *ClassTemplate,
3058 ClassTemplatePartialSpecializationDecl *PartialSpec) {
3059 // Create a local instantiation scope for this class template partial
3060 // specialization, which will contain the instantiations of the template
3062 LocalInstantiationScope Scope(SemaRef);
3064 // Substitute into the template parameters of the class template partial
3066 TemplateParameterList *TempParams = PartialSpec->getTemplateParameters();
3067 TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
3071 // Substitute into the template arguments of the class template partial
3073 const ASTTemplateArgumentListInfo *TemplArgInfo
3074 = PartialSpec->getTemplateArgsAsWritten();
3075 TemplateArgumentListInfo InstTemplateArgs(TemplArgInfo->LAngleLoc,
3076 TemplArgInfo->RAngleLoc);
3077 if (SemaRef.Subst(TemplArgInfo->getTemplateArgs(),
3078 TemplArgInfo->NumTemplateArgs,
3079 InstTemplateArgs, TemplateArgs))
3082 // Check that the template argument list is well-formed for this
3084 SmallVector<TemplateArgument, 4> Converted;
3085 if (SemaRef.CheckTemplateArgumentList(ClassTemplate,
3086 PartialSpec->getLocation(),
3092 // Check these arguments are valid for a template partial specialization.
3093 if (SemaRef.CheckTemplatePartialSpecializationArgs(
3094 PartialSpec->getLocation(), ClassTemplate, InstTemplateArgs.size(),
3098 // Figure out where to insert this class template partial specialization
3099 // in the member template's set of class template partial specializations.
3100 void *InsertPos = nullptr;
3101 ClassTemplateSpecializationDecl *PrevDecl
3102 = ClassTemplate->findPartialSpecialization(Converted, InsertPos);
3104 // Build the canonical type that describes the converted template
3105 // arguments of the class template partial specialization.
3107 = SemaRef.Context.getTemplateSpecializationType(TemplateName(ClassTemplate),
3110 // Build the fully-sugared type for this class template
3111 // specialization as the user wrote in the specialization
3112 // itself. This means that we'll pretty-print the type retrieved
3113 // from the specialization's declaration the way that the user
3114 // actually wrote the specialization, rather than formatting the
3115 // name based on the "canonical" representation used to store the
3116 // template arguments in the specialization.
3117 TypeSourceInfo *WrittenTy
3118 = SemaRef.Context.getTemplateSpecializationTypeInfo(
3119 TemplateName(ClassTemplate),
3120 PartialSpec->getLocation(),
3125 // We've already seen a partial specialization with the same template
3126 // parameters and template arguments. This can happen, for example, when
3127 // substituting the outer template arguments ends up causing two
3128 // class template partial specializations of a member class template
3129 // to have identical forms, e.g.,
3131 // template<typename T, typename U>
3133 // template<typename X, typename Y> struct Inner;
3134 // template<typename Y> struct Inner<T, Y>;
3135 // template<typename Y> struct Inner<U, Y>;
3138 // Outer<int, int> outer; // error: the partial specializations of Inner
3139 // // have the same signature.
3140 SemaRef.Diag(PartialSpec->getLocation(), diag::err_partial_spec_redeclared)
3141 << WrittenTy->getType();
3142 SemaRef.Diag(PrevDecl->getLocation(), diag::note_prev_partial_spec_here)
3143 << SemaRef.Context.getTypeDeclType(PrevDecl);
3148 // Create the class template partial specialization declaration.
3149 ClassTemplatePartialSpecializationDecl *InstPartialSpec
3150 = ClassTemplatePartialSpecializationDecl::Create(SemaRef.Context,
3151 PartialSpec->getTagKind(),
3153 PartialSpec->getLocStart(),
3154 PartialSpec->getLocation(),
3161 // Substitute the nested name specifier, if any.
3162 if (SubstQualifier(PartialSpec, InstPartialSpec))
3165 InstPartialSpec->setInstantiatedFromMember(PartialSpec);
3166 InstPartialSpec->setTypeAsWritten(WrittenTy);
3168 // Check the completed partial specialization.
3169 SemaRef.CheckTemplatePartialSpecialization(InstPartialSpec);
3171 // Add this partial specialization to the set of class template partial
3173 ClassTemplate->AddPartialSpecialization(InstPartialSpec,
3174 /*InsertPos=*/nullptr);
3175 return InstPartialSpec;
3178 /// \brief Instantiate the declaration of a variable template partial
3181 /// \param VarTemplate the (instantiated) variable template that is partially
3182 /// specialized by the instantiation of \p PartialSpec.
3184 /// \param PartialSpec the (uninstantiated) variable template partial
3185 /// specialization that we are instantiating.
3187 /// \returns The instantiated partial specialization, if successful; otherwise,
3188 /// NULL to indicate an error.
3189 VarTemplatePartialSpecializationDecl *
3190 TemplateDeclInstantiator::InstantiateVarTemplatePartialSpecialization(
3191 VarTemplateDecl *VarTemplate,
3192 VarTemplatePartialSpecializationDecl *PartialSpec) {
3193 // Create a local instantiation scope for this variable template partial
3194 // specialization, which will contain the instantiations of the template
3196 LocalInstantiationScope Scope(SemaRef);
3198 // Substitute into the template parameters of the variable template partial
3200 TemplateParameterList *TempParams = PartialSpec->getTemplateParameters();
3201 TemplateParameterList *InstParams = SubstTemplateParams(TempParams);
3205 // Substitute into the template arguments of the variable template partial
3207 const ASTTemplateArgumentListInfo *TemplArgInfo
3208 = PartialSpec->getTemplateArgsAsWritten();
3209 TemplateArgumentListInfo InstTemplateArgs(TemplArgInfo->LAngleLoc,
3210 TemplArgInfo->RAngleLoc);
3211 if (SemaRef.Subst(TemplArgInfo->getTemplateArgs(),
3212 TemplArgInfo->NumTemplateArgs,
3213 InstTemplateArgs, TemplateArgs))
3216 // Check that the template argument list is well-formed for this
3218 SmallVector<TemplateArgument, 4> Converted;
3219 if (SemaRef.CheckTemplateArgumentList(VarTemplate, PartialSpec->getLocation(),
3220 InstTemplateArgs, false, Converted))
3223 // Check these arguments are valid for a template partial specialization.
3224 if (SemaRef.CheckTemplatePartialSpecializationArgs(
3225 PartialSpec->getLocation(), VarTemplate, InstTemplateArgs.size(),
3229 // Figure out where to insert this variable template partial specialization
3230 // in the member template's set of variable template partial specializations.
3231 void *InsertPos = nullptr;
3232 VarTemplateSpecializationDecl *PrevDecl =
3233 VarTemplate->findPartialSpecialization(Converted, InsertPos);
3235 // Build the canonical type that describes the converted template
3236 // arguments of the variable template partial specialization.
3237 QualType CanonType = SemaRef.Context.getTemplateSpecializationType(
3238 TemplateName(VarTemplate), Converted);
3240 // Build the fully-sugared type for this variable template
3241 // specialization as the user wrote in the specialization
3242 // itself. This means that we'll pretty-print the type retrieved
3243 // from the specialization's declaration the way that the user
3244 // actually wrote the specialization, rather than formatting the
3245 // name based on the "canonical" representation used to store the
3246 // template arguments in the specialization.
3247 TypeSourceInfo *WrittenTy = SemaRef.Context.getTemplateSpecializationTypeInfo(
3248 TemplateName(VarTemplate), PartialSpec->getLocation(), InstTemplateArgs,
3252 // We've already seen a partial specialization with the same template
3253 // parameters and template arguments. This can happen, for example, when
3254 // substituting the outer template arguments ends up causing two
3255 // variable template partial specializations of a member variable template
3256 // to have identical forms, e.g.,
3258 // template<typename T, typename U>
3260 // template<typename X, typename Y> pair<X,Y> p;
3261 // template<typename Y> pair<T, Y> p;
3262 // template<typename Y> pair<U, Y> p;
3265 // Outer<int, int> outer; // error: the partial specializations of Inner
3266 // // have the same signature.
3267 SemaRef.Diag(PartialSpec->getLocation(),
3268 diag::err_var_partial_spec_redeclared)
3269 << WrittenTy->getType();
3270 SemaRef.Diag(PrevDecl->getLocation(),
3271 diag::note_var_prev_partial_spec_here);
3275 // Do substitution on the type of the declaration
3276 TypeSourceInfo *DI = SemaRef.SubstType(
3277 PartialSpec->getTypeSourceInfo(), TemplateArgs,
3278 PartialSpec->getTypeSpecStartLoc(), PartialSpec->getDeclName());
3282 if (DI->getType()->isFunctionType()) {
3283 SemaRef.Diag(PartialSpec->getLocation(),
3284 diag::err_variable_instantiates_to_function)
3285 << PartialSpec->isStaticDataMember() << DI->getType();
3289 // Create the variable template partial specialization declaration.
3290 VarTemplatePartialSpecializationDecl *InstPartialSpec =
3291 VarTemplatePartialSpecializationDecl::Create(
3292 SemaRef.Context, Owner, PartialSpec->getInnerLocStart(),
3293 PartialSpec->getLocation(), InstParams, VarTemplate, DI->getType(),
3294 DI, PartialSpec->getStorageClass(), Converted, InstTemplateArgs);
3296 // Substitute the nested name specifier, if any.
3297 if (SubstQualifier(PartialSpec, InstPartialSpec))
3300 InstPartialSpec->setInstantiatedFromMember(PartialSpec);
3301 InstPartialSpec->setTypeAsWritten(WrittenTy);
3303 // Check the completed partial specialization.
3304 SemaRef.CheckTemplatePartialSpecialization(InstPartialSpec);
3306 // Add this partial specialization to the set of variable template partial
3307 // specializations. The instantiation of the initializer is not necessary.
3308 VarTemplate->AddPartialSpecialization(InstPartialSpec, /*InsertPos=*/nullptr);
3310 SemaRef.BuildVariableInstantiation(InstPartialSpec, PartialSpec, TemplateArgs,
3311 LateAttrs, Owner, StartingScope);
3313 return InstPartialSpec;
3317 TemplateDeclInstantiator::SubstFunctionType(FunctionDecl *D,
3318 SmallVectorImpl<ParmVarDecl *> &Params) {
3319 TypeSourceInfo *OldTInfo = D->getTypeSourceInfo();
3320 assert(OldTInfo && "substituting function without type source info");
3321 assert(Params.empty() && "parameter vector is non-empty at start");
3323 CXXRecordDecl *ThisContext = nullptr;
3324 unsigned ThisTypeQuals = 0;
3325 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) {
3326 ThisContext = cast<CXXRecordDecl>(Owner);
3327 ThisTypeQuals = Method->getTypeQualifiers();
3330 TypeSourceInfo *NewTInfo
3331 = SemaRef.SubstFunctionDeclType(OldTInfo, TemplateArgs,
3332 D->getTypeSpecStartLoc(),
3334 ThisContext, ThisTypeQuals);
3338 TypeLoc OldTL = OldTInfo->getTypeLoc().IgnoreParens();
3339 if (FunctionProtoTypeLoc OldProtoLoc = OldTL.getAs<FunctionProtoTypeLoc>()) {
3340 if (NewTInfo != OldTInfo) {
3341 // Get parameters from the new type info.
3342 TypeLoc NewTL = NewTInfo->getTypeLoc().IgnoreParens();
3343 FunctionProtoTypeLoc NewProtoLoc = NewTL.castAs<FunctionProtoTypeLoc>();
3344 unsigned NewIdx = 0;
3345 for (unsigned OldIdx = 0, NumOldParams = OldProtoLoc.getNumParams();
3346 OldIdx != NumOldParams; ++OldIdx) {
3347 ParmVarDecl *OldParam = OldProtoLoc.getParam(OldIdx);
3348 LocalInstantiationScope *Scope = SemaRef.CurrentInstantiationScope;
3350 Optional<unsigned> NumArgumentsInExpansion;
3351 if (OldParam->isParameterPack())
3352 NumArgumentsInExpansion =
3353 SemaRef.getNumArgumentsInExpansion(OldParam->getType(),
3355 if (!NumArgumentsInExpansion) {
3356 // Simple case: normal parameter, or a parameter pack that's
3357 // instantiated to a (still-dependent) parameter pack.
3358 ParmVarDecl *NewParam = NewProtoLoc.getParam(NewIdx++);
3359 Params.push_back(NewParam);
3360 Scope->InstantiatedLocal(OldParam, NewParam);
3362 // Parameter pack expansion: make the instantiation an argument pack.
3363 Scope->MakeInstantiatedLocalArgPack(OldParam);
3364 for (unsigned I = 0; I != *NumArgumentsInExpansion; ++I) {
3365 ParmVarDecl *NewParam = NewProtoLoc.getParam(NewIdx++);
3366 Params.push_back(NewParam);
3367 Scope->InstantiatedLocalPackArg(OldParam, NewParam);
3372 // The function type itself was not dependent and therefore no
3373 // substitution occurred. However, we still need to instantiate
3374 // the function parameters themselves.
3375 const FunctionProtoType *OldProto =
3376 cast<FunctionProtoType>(OldProtoLoc.getType());
3377 for (unsigned i = 0, i_end = OldProtoLoc.getNumParams(); i != i_end;
3379 ParmVarDecl *OldParam = OldProtoLoc.getParam(i);
3381 Params.push_back(SemaRef.BuildParmVarDeclForTypedef(
3382 D, D->getLocation(), OldProto->getParamType(i)));
3387 cast_or_null<ParmVarDecl>(VisitParmVarDecl(OldParam));
3390 Params.push_back(Parm);
3394 // If the type of this function, after ignoring parentheses, is not
3395 // *directly* a function type, then we're instantiating a function that
3396 // was declared via a typedef or with attributes, e.g.,
3398 // typedef int functype(int, int);
3400 // int __cdecl meth(int, int);
3402 // In this case, we'll just go instantiate the ParmVarDecls that we
3403 // synthesized in the method declaration.
3404 SmallVector<QualType, 4> ParamTypes;
3405 Sema::ExtParameterInfoBuilder ExtParamInfos;
3406 if (SemaRef.SubstParmTypes(D->getLocation(), D->parameters(), nullptr,
3407 TemplateArgs, ParamTypes, &Params,
3415 /// Introduce the instantiated function parameters into the local
3416 /// instantiation scope, and set the parameter names to those used
3417 /// in the template.
3418 static bool addInstantiatedParametersToScope(Sema &S, FunctionDecl *Function,
3419 const FunctionDecl *PatternDecl,
3420 LocalInstantiationScope &Scope,
3421 const MultiLevelTemplateArgumentList &TemplateArgs) {
3422 unsigned FParamIdx = 0;
3423 for (unsigned I = 0, N = PatternDecl->getNumParams(); I != N; ++I) {
3424 const ParmVarDecl *PatternParam = PatternDecl->getParamDecl(I);
3425 if (!PatternParam->isParameterPack()) {
3426 // Simple case: not a parameter pack.
3427 assert(FParamIdx < Function->getNumParams());
3428 ParmVarDecl *FunctionParam = Function->getParamDecl(FParamIdx);
3429 FunctionParam->setDeclName(PatternParam->getDeclName());
3430 // If the parameter's type is not dependent, update it to match the type
3431 // in the pattern. They can differ in top-level cv-qualifiers, and we want
3432 // the pattern's type here. If the type is dependent, they can't differ,
3433 // per core issue 1668. Substitute into the type from the pattern, in case
3434 // it's instantiation-dependent.
3435 // FIXME: Updating the type to work around this is at best fragile.
3436 if (!PatternDecl->getType()->isDependentType()) {
3437 QualType T = S.SubstType(PatternParam->getType(), TemplateArgs,
3438 FunctionParam->getLocation(),
3439 FunctionParam->getDeclName());
3442 FunctionParam->setType(T);
3445 Scope.InstantiatedLocal(PatternParam, FunctionParam);
3450 // Expand the parameter pack.
3451 Scope.MakeInstantiatedLocalArgPack(PatternParam);
3452 Optional<unsigned> NumArgumentsInExpansion
3453 = S.getNumArgumentsInExpansion(PatternParam->getType(), TemplateArgs);
3454 assert(NumArgumentsInExpansion &&
3455 "should only be called when all template arguments are known");
3456 QualType PatternType =
3457 PatternParam->getType()->castAs<PackExpansionType>()->getPattern();
3458 for (unsigned Arg = 0; Arg < *NumArgumentsInExpansion; ++Arg) {
3459 ParmVarDecl *FunctionParam = Function->getParamDecl(FParamIdx);
3460 FunctionParam->setDeclName(PatternParam->getDeclName());
3461 if (!PatternDecl->getType()->isDependentType()) {
3462 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(S, Arg);
3463 QualType T = S.SubstType(PatternType, TemplateArgs,
3464 FunctionParam->getLocation(),
3465 FunctionParam->getDeclName());
3468 FunctionParam->setType(T);
3471 Scope.InstantiatedLocalPackArg(PatternParam, FunctionParam);
3479 void Sema::InstantiateExceptionSpec(SourceLocation PointOfInstantiation,
3480 FunctionDecl *Decl) {
3481 const FunctionProtoType *Proto = Decl->getType()->castAs<FunctionProtoType>();
3482 if (Proto->getExceptionSpecType() != EST_Uninstantiated)
3485 InstantiatingTemplate Inst(*this, PointOfInstantiation, Decl,
3486 InstantiatingTemplate::ExceptionSpecification());
3487 if (Inst.isInvalid()) {
3488 // We hit the instantiation depth limit. Clear the exception specification
3489 // so that our callers don't have to cope with EST_Uninstantiated.
3490 UpdateExceptionSpec(Decl, EST_None);
3493 if (Inst.isAlreadyInstantiating()) {
3494 // This exception specification indirectly depends on itself. Reject.
3495 // FIXME: Corresponding rule in the standard?
3496 Diag(PointOfInstantiation, diag::err_exception_spec_cycle) << Decl;
3497 UpdateExceptionSpec(Decl, EST_None);
3501 // Enter the scope of this instantiation. We don't use
3502 // PushDeclContext because we don't have a scope.
3503 Sema::ContextRAII savedContext(*this, Decl);
3504 LocalInstantiationScope Scope(*this);
3506 MultiLevelTemplateArgumentList TemplateArgs =
3507 getTemplateInstantiationArgs(Decl, nullptr, /*RelativeToPrimary*/true);
3509 FunctionDecl *Template = Proto->getExceptionSpecTemplate();
3510 if (addInstantiatedParametersToScope(*this, Decl, Template, Scope,
3512 UpdateExceptionSpec(Decl, EST_None);
3516 SubstExceptionSpec(Decl, Template->getType()->castAs<FunctionProtoType>(),
3520 /// \brief Initializes the common fields of an instantiation function
3521 /// declaration (New) from the corresponding fields of its template (Tmpl).
3523 /// \returns true if there was an error
3525 TemplateDeclInstantiator::InitFunctionInstantiation(FunctionDecl *New,
3526 FunctionDecl *Tmpl) {
3527 if (Tmpl->isDeleted())
3528 New->setDeletedAsWritten();
3530 // Forward the mangling number from the template to the instantiated decl.
3531 SemaRef.Context.setManglingNumber(New,
3532 SemaRef.Context.getManglingNumber(Tmpl));
3534 // If we are performing substituting explicitly-specified template arguments
3535 // or deduced template arguments into a function template and we reach this
3536 // point, we are now past the point where SFINAE applies and have committed
3537 // to keeping the new function template specialization. We therefore
3538 // convert the active template instantiation for the function template
3539 // into a template instantiation for this specific function template
3540 // specialization, which is not a SFINAE context, so that we diagnose any
3541 // further errors in the declaration itself.
3542 typedef Sema::ActiveTemplateInstantiation ActiveInstType;
3543 ActiveInstType &ActiveInst = SemaRef.ActiveTemplateInstantiations.back();
3544 if (ActiveInst.Kind == ActiveInstType::ExplicitTemplateArgumentSubstitution ||
3545 ActiveInst.Kind == ActiveInstType::DeducedTemplateArgumentSubstitution) {
3546 if (FunctionTemplateDecl *FunTmpl
3547 = dyn_cast<FunctionTemplateDecl>(ActiveInst.Entity)) {
3548 assert(FunTmpl->getTemplatedDecl() == Tmpl &&
3549 "Deduction from the wrong function template?");
3551 ActiveInst.Kind = ActiveInstType::TemplateInstantiation;
3552 ActiveInst.Entity = New;
3556 const FunctionProtoType *Proto = Tmpl->getType()->getAs<FunctionProtoType>();
3557 assert(Proto && "Function template without prototype?");
3559 if (Proto->hasExceptionSpec() || Proto->getNoReturnAttr()) {
3560 FunctionProtoType::ExtProtoInfo EPI = Proto->getExtProtoInfo();
3562 // DR1330: In C++11, defer instantiation of a non-trivial
3563 // exception specification.
3564 // DR1484: Local classes and their members are instantiated along with the
3565 // containing function.
3566 if (SemaRef.getLangOpts().CPlusPlus11 &&
3567 EPI.ExceptionSpec.Type != EST_None &&
3568 EPI.ExceptionSpec.Type != EST_DynamicNone &&
3569 EPI.ExceptionSpec.Type != EST_BasicNoexcept &&
3570 !Tmpl->isLexicallyWithinFunctionOrMethod()) {
3571 FunctionDecl *ExceptionSpecTemplate = Tmpl;
3572 if (EPI.ExceptionSpec.Type == EST_Uninstantiated)
3573 ExceptionSpecTemplate = EPI.ExceptionSpec.SourceTemplate;
3574 ExceptionSpecificationType NewEST = EST_Uninstantiated;
3575 if (EPI.ExceptionSpec.Type == EST_Unevaluated)
3576 NewEST = EST_Unevaluated;
3578 // Mark the function has having an uninstantiated exception specification.
3579 const FunctionProtoType *NewProto
3580 = New->getType()->getAs<FunctionProtoType>();
3581 assert(NewProto && "Template instantiation without function prototype?");
3582 EPI = NewProto->getExtProtoInfo();
3583 EPI.ExceptionSpec.Type = NewEST;
3584 EPI.ExceptionSpec.SourceDecl = New;
3585 EPI.ExceptionSpec.SourceTemplate = ExceptionSpecTemplate;
3586 New->setType(SemaRef.Context.getFunctionType(
3587 NewProto->getReturnType(), NewProto->getParamTypes(), EPI));
3589 SemaRef.SubstExceptionSpec(New, Proto, TemplateArgs);
3593 // Get the definition. Leaves the variable unchanged if undefined.
3594 const FunctionDecl *Definition = Tmpl;
3595 Tmpl->isDefined(Definition);
3597 SemaRef.InstantiateAttrs(TemplateArgs, Definition, New,
3598 LateAttrs, StartingScope);
3603 /// \brief Initializes common fields of an instantiated method
3604 /// declaration (New) from the corresponding fields of its template
3607 /// \returns true if there was an error
3609 TemplateDeclInstantiator::InitMethodInstantiation(CXXMethodDecl *New,
3610 CXXMethodDecl *Tmpl) {
3611 if (InitFunctionInstantiation(New, Tmpl))
3614 New->setAccess(Tmpl->getAccess());
3615 if (Tmpl->isVirtualAsWritten())
3616 New->setVirtualAsWritten(true);
3618 // FIXME: New needs a pointer to Tmpl
3622 /// In the MS ABI, we need to instantiate default arguments of dllexported
3623 /// default constructors along with the constructor definition. This allows IR
3624 /// gen to emit a constructor closure which calls the default constructor with
3625 /// its default arguments.
3626 static void InstantiateDefaultCtorDefaultArgs(Sema &S,
3627 CXXConstructorDecl *Ctor) {
3628 assert(S.Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3629 Ctor->isDefaultConstructor());
3630 unsigned NumParams = Ctor->getNumParams();
3633 DLLExportAttr *Attr = Ctor->getAttr<DLLExportAttr>();
3636 for (unsigned I = 0; I != NumParams; ++I) {
3637 (void)S.CheckCXXDefaultArgExpr(Attr->getLocation(), Ctor,
3638 Ctor->getParamDecl(I));
3639 S.DiscardCleanupsInEvaluationContext();
3643 /// \brief Instantiate the definition of the given function from its
3646 /// \param PointOfInstantiation the point at which the instantiation was
3647 /// required. Note that this is not precisely a "point of instantiation"
3648 /// for the function, but it's close.
3650 /// \param Function the already-instantiated declaration of a
3651 /// function template specialization or member function of a class template
3654 /// \param Recursive if true, recursively instantiates any functions that
3655 /// are required by this instantiation.
3657 /// \param DefinitionRequired if true, then we are performing an explicit
3658 /// instantiation where the body of the function is required. Complain if
3659 /// there is no such body.
3660 void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
3661 FunctionDecl *Function,
3663 bool DefinitionRequired,
3665 if (Function->isInvalidDecl() || Function->isDefined())
3668 // Never instantiate an explicit specialization except if it is a class scope
3669 // explicit specialization.
3670 TemplateSpecializationKind TSK = Function->getTemplateSpecializationKind();
3671 if (TSK == TSK_ExplicitSpecialization &&
3672 !Function->getClassScopeSpecializationPattern())
3675 // Find the function body that we'll be substituting.
3676 const FunctionDecl *PatternDecl = Function->getTemplateInstantiationPattern();
3677 assert(PatternDecl && "instantiating a non-template");
3679 const FunctionDecl *PatternDef = PatternDecl->getDefinition();
3680 Stmt *Pattern = nullptr;
3682 Pattern = PatternDef->getBody(PatternDef);
3683 PatternDecl = PatternDef;
3686 // FIXME: We need to track the instantiation stack in order to know which
3687 // definitions should be visible within this instantiation.
3688 if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Function,
3689 Function->getInstantiatedFromMemberFunction(),
3690 PatternDecl, PatternDef, TSK,
3691 /*Complain*/DefinitionRequired)) {
3692 if (DefinitionRequired)
3693 Function->setInvalidDecl();
3694 else if (TSK == TSK_ExplicitInstantiationDefinition) {
3695 // Try again at the end of the translation unit (at which point a
3696 // definition will be required).
3698 PendingInstantiations.push_back(
3699 std::make_pair(Function, PointOfInstantiation));
3700 } else if (TSK == TSK_ImplicitInstantiation) {
3701 if (AtEndOfTU && !getDiagnostics().hasErrorOccurred()) {
3702 Diag(PointOfInstantiation, diag::warn_func_template_missing)
3704 Diag(PatternDecl->getLocation(), diag::note_forward_template_decl);
3705 if (getLangOpts().CPlusPlus11)
3706 Diag(PointOfInstantiation, diag::note_inst_declaration_hint)
3714 // Postpone late parsed template instantiations.
3715 if (PatternDecl->isLateTemplateParsed() &&
3716 !LateTemplateParser) {
3717 PendingInstantiations.push_back(
3718 std::make_pair(Function, PointOfInstantiation));
3722 // If we're performing recursive template instantiation, create our own
3723 // queue of pending implicit instantiations that we will instantiate later,
3724 // while we're still within our own instantiation context.
3725 // This has to happen before LateTemplateParser below is called, so that
3726 // it marks vtables used in late parsed templates as used.
3727 SavePendingLocalImplicitInstantiationsRAII
3728 SavedPendingLocalImplicitInstantiations(*this);
3729 SavePendingInstantiationsAndVTableUsesRAII
3730 SavePendingInstantiationsAndVTableUses(*this, /*Enabled=*/Recursive);
3732 // Call the LateTemplateParser callback if there is a need to late parse
3733 // a templated function definition.
3734 if (!Pattern && PatternDecl->isLateTemplateParsed() &&
3735 LateTemplateParser) {
3736 // FIXME: Optimize to allow individual templates to be deserialized.
3737 if (PatternDecl->isFromASTFile())
3738 ExternalSource->ReadLateParsedTemplates(LateParsedTemplateMap);
3740 auto LPTIter = LateParsedTemplateMap.find(PatternDecl);
3741 assert(LPTIter != LateParsedTemplateMap.end() &&
3742 "missing LateParsedTemplate");
3743 LateTemplateParser(OpaqueParser, *LPTIter->second);
3744 Pattern = PatternDecl->getBody(PatternDecl);
3747 // Note, we should never try to instantiate a deleted function template.
3748 assert((Pattern || PatternDecl->isDefaulted()) &&
3749 "unexpected kind of function template definition");
3751 // C++1y [temp.explicit]p10:
3752 // Except for inline functions, declarations with types deduced from their
3753 // initializer or return value, and class template specializations, other
3754 // explicit instantiation declarations have the effect of suppressing the
3755 // implicit instantiation of the entity to which they refer.
3756 if (TSK == TSK_ExplicitInstantiationDeclaration &&
3757 !PatternDecl->isInlined() &&
3758 !PatternDecl->getReturnType()->getContainedAutoType())
3761 if (PatternDecl->isInlined()) {
3762 // Function, and all later redeclarations of it (from imported modules,
3763 // for instance), are now implicitly inline.
3764 for (auto *D = Function->getMostRecentDecl(); /**/;
3765 D = D->getPreviousDecl()) {
3766 D->setImplicitlyInline();
3772 InstantiatingTemplate Inst(*this, PointOfInstantiation, Function);
3773 if (Inst.isInvalid() || Inst.isAlreadyInstantiating())
3775 PrettyDeclStackTraceEntry CrashInfo(*this, Function, SourceLocation(),
3776 "instantiating function definition");
3778 // The instantiation is visible here, even if it was first declared in an
3779 // unimported module.
3780 Function->setHidden(false);
3782 // Copy the inner loc start from the pattern.
3783 Function->setInnerLocStart(PatternDecl->getInnerLocStart());
3785 EnterExpressionEvaluationContext EvalContext(*this,
3786 Sema::PotentiallyEvaluated);
3788 // Introduce a new scope where local variable instantiations will be
3789 // recorded, unless we're actually a member function within a local
3790 // class, in which case we need to merge our results with the parent
3791 // scope (of the enclosing function).
3792 bool MergeWithParentScope = false;
3793 if (CXXRecordDecl *Rec = dyn_cast<CXXRecordDecl>(Function->getDeclContext()))
3794 MergeWithParentScope = Rec->isLocalClass();
3796 LocalInstantiationScope Scope(*this, MergeWithParentScope);
3798 if (PatternDecl->isDefaulted())
3799 SetDeclDefaulted(Function, PatternDecl->getLocation());
3801 MultiLevelTemplateArgumentList TemplateArgs =
3802 getTemplateInstantiationArgs(Function, nullptr, false, PatternDecl);
3804 // Substitute into the qualifier; we can get a substitution failure here
3805 // through evil use of alias templates.
3806 // FIXME: Is CurContext correct for this? Should we go to the (instantiation
3807 // of the) lexical context of the pattern?
3808 SubstQualifier(*this, PatternDecl, Function, TemplateArgs);
3810 ActOnStartOfFunctionDef(nullptr, Function);
3812 // Enter the scope of this instantiation. We don't use
3813 // PushDeclContext because we don't have a scope.
3814 Sema::ContextRAII savedContext(*this, Function);
3816 if (addInstantiatedParametersToScope(*this, Function, PatternDecl, Scope,
3820 if (CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(Function)) {
3821 // If this is a constructor, instantiate the member initializers.
3822 InstantiateMemInitializers(Ctor, cast<CXXConstructorDecl>(PatternDecl),
3825 // If this is an MS ABI dllexport default constructor, instantiate any
3826 // default arguments.
3827 if (Context.getTargetInfo().getCXXABI().isMicrosoft() &&
3828 Ctor->isDefaultConstructor()) {
3829 InstantiateDefaultCtorDefaultArgs(*this, Ctor);
3833 // Instantiate the function body.
3834 StmtResult Body = SubstStmt(Pattern, TemplateArgs);
3836 if (Body.isInvalid())
3837 Function->setInvalidDecl();
3839 ActOnFinishFunctionBody(Function, Body.get(),
3840 /*IsInstantiation=*/true);
3842 PerformDependentDiagnostics(PatternDecl, TemplateArgs);
3844 if (auto *Listener = getASTMutationListener())
3845 Listener->FunctionDefinitionInstantiated(Function);
3850 DeclGroupRef DG(Function);
3851 Consumer.HandleTopLevelDecl(DG);
3853 // This class may have local implicit instantiations that need to be
3854 // instantiation within this scope.
3855 PerformPendingInstantiations(/*LocalOnly=*/true);
3859 // Define any pending vtables.
3860 DefineUsedVTables();
3862 // Instantiate any pending implicit instantiations found during the
3863 // instantiation of this template.
3864 PerformPendingInstantiations();
3866 // PendingInstantiations and VTableUses are restored through
3867 // SavePendingInstantiationsAndVTableUses's destructor.
3871 VarTemplateSpecializationDecl *Sema::BuildVarTemplateInstantiation(
3872 VarTemplateDecl *VarTemplate, VarDecl *FromVar,
3873 const TemplateArgumentList &TemplateArgList,
3874 const TemplateArgumentListInfo &TemplateArgsInfo,
3875 SmallVectorImpl<TemplateArgument> &Converted,
3876 SourceLocation PointOfInstantiation, void *InsertPos,
3877 LateInstantiatedAttrVec *LateAttrs,
3878 LocalInstantiationScope *StartingScope) {
3879 if (FromVar->isInvalidDecl())
3882 InstantiatingTemplate Inst(*this, PointOfInstantiation, FromVar);
3883 if (Inst.isInvalid())
3886 MultiLevelTemplateArgumentList TemplateArgLists;
3887 TemplateArgLists.addOuterTemplateArguments(&TemplateArgList);
3889 // Instantiate the first declaration of the variable template: for a partial
3890 // specialization of a static data member template, the first declaration may
3891 // or may not be the declaration in the class; if it's in the class, we want
3892 // to instantiate a member in the class (a declaration), and if it's outside,
3893 // we want to instantiate a definition.
3895 // If we're instantiating an explicitly-specialized member template or member
3896 // partial specialization, don't do this. The member specialization completely
3897 // replaces the original declaration in this case.
3898 bool IsMemberSpec = false;
3899 if (VarTemplatePartialSpecializationDecl *PartialSpec =
3900 dyn_cast<VarTemplatePartialSpecializationDecl>(FromVar))
3901 IsMemberSpec = PartialSpec->isMemberSpecialization();
3902 else if (VarTemplateDecl *FromTemplate = FromVar->getDescribedVarTemplate())
3903 IsMemberSpec = FromTemplate->isMemberSpecialization();
3905 FromVar = FromVar->getFirstDecl();
3907 MultiLevelTemplateArgumentList MultiLevelList(TemplateArgList);
3908 TemplateDeclInstantiator Instantiator(*this, FromVar->getDeclContext(),
3911 // TODO: Set LateAttrs and StartingScope ...
3913 return cast_or_null<VarTemplateSpecializationDecl>(
3914 Instantiator.VisitVarTemplateSpecializationDecl(
3915 VarTemplate, FromVar, InsertPos, TemplateArgsInfo, Converted));
3918 /// \brief Instantiates a variable template specialization by completing it
3919 /// with appropriate type information and initializer.
3920 VarTemplateSpecializationDecl *Sema::CompleteVarTemplateSpecializationDecl(
3921 VarTemplateSpecializationDecl *VarSpec, VarDecl *PatternDecl,
3922 const MultiLevelTemplateArgumentList &TemplateArgs) {
3924 // Do substitution on the type of the declaration
3925 TypeSourceInfo *DI =
3926 SubstType(PatternDecl->getTypeSourceInfo(), TemplateArgs,
3927 PatternDecl->getTypeSpecStartLoc(), PatternDecl->getDeclName());
3931 // Update the type of this variable template specialization.
3932 VarSpec->setType(DI->getType());
3934 // Instantiate the initializer.
3935 InstantiateVariableInitializer(VarSpec, PatternDecl, TemplateArgs);
3940 /// BuildVariableInstantiation - Used after a new variable has been created.
3941 /// Sets basic variable data and decides whether to postpone the
3942 /// variable instantiation.
3943 void Sema::BuildVariableInstantiation(
3944 VarDecl *NewVar, VarDecl *OldVar,
3945 const MultiLevelTemplateArgumentList &TemplateArgs,
3946 LateInstantiatedAttrVec *LateAttrs, DeclContext *Owner,
3947 LocalInstantiationScope *StartingScope,
3948 bool InstantiatingVarTemplate) {
3950 // If we are instantiating a local extern declaration, the
3951 // instantiation belongs lexically to the containing function.
3952 // If we are instantiating a static data member defined
3953 // out-of-line, the instantiation will have the same lexical
3954 // context (which will be a namespace scope) as the template.
3955 if (OldVar->isLocalExternDecl()) {
3956 NewVar->setLocalExternDecl();
3957 NewVar->setLexicalDeclContext(Owner);
3958 } else if (OldVar->isOutOfLine())
3959 NewVar->setLexicalDeclContext(OldVar->getLexicalDeclContext());
3960 NewVar->setTSCSpec(OldVar->getTSCSpec());
3961 NewVar->setInitStyle(OldVar->getInitStyle());
3962 NewVar->setCXXForRangeDecl(OldVar->isCXXForRangeDecl());
3963 NewVar->setConstexpr(OldVar->isConstexpr());
3964 NewVar->setInitCapture(OldVar->isInitCapture());
3965 NewVar->setPreviousDeclInSameBlockScope(
3966 OldVar->isPreviousDeclInSameBlockScope());
3967 NewVar->setAccess(OldVar->getAccess());
3969 if (!OldVar->isStaticDataMember()) {
3970 if (OldVar->isUsed(false))
3971 NewVar->setIsUsed();
3972 NewVar->setReferenced(OldVar->isReferenced());
3975 InstantiateAttrs(TemplateArgs, OldVar, NewVar, LateAttrs, StartingScope);
3977 LookupResult Previous(
3978 *this, NewVar->getDeclName(), NewVar->getLocation(),
3979 NewVar->isLocalExternDecl() ? Sema::LookupRedeclarationWithLinkage
3980 : Sema::LookupOrdinaryName,
3981 Sema::ForRedeclaration);
3983 if (NewVar->isLocalExternDecl() && OldVar->getPreviousDecl() &&
3984 (!OldVar->getPreviousDecl()->getDeclContext()->isDependentContext() ||
3985 OldVar->getPreviousDecl()->getDeclContext()==OldVar->getDeclContext())) {
3986 // We have a previous declaration. Use that one, so we merge with the
3988 if (NamedDecl *NewPrev = FindInstantiatedDecl(
3989 NewVar->getLocation(), OldVar->getPreviousDecl(), TemplateArgs))
3990 Previous.addDecl(NewPrev);
3991 } else if (!isa<VarTemplateSpecializationDecl>(NewVar) &&
3992 OldVar->hasLinkage())
3993 LookupQualifiedName(Previous, NewVar->getDeclContext(), false);
3994 CheckVariableDeclaration(NewVar, Previous);
3996 if (!InstantiatingVarTemplate) {
3997 NewVar->getLexicalDeclContext()->addHiddenDecl(NewVar);
3998 if (!NewVar->isLocalExternDecl() || !NewVar->getPreviousDecl())
3999 NewVar->getDeclContext()->makeDeclVisibleInContext(NewVar);
4002 if (!OldVar->isOutOfLine()) {
4003 if (NewVar->getDeclContext()->isFunctionOrMethod())
4004 CurrentInstantiationScope->InstantiatedLocal(OldVar, NewVar);
4007 // Link instantiations of static data members back to the template from
4008 // which they were instantiated.
4009 if (NewVar->isStaticDataMember() && !InstantiatingVarTemplate)
4010 NewVar->setInstantiationOfStaticDataMember(OldVar,
4011 TSK_ImplicitInstantiation);
4013 // Forward the mangling number from the template to the instantiated decl.
4014 Context.setManglingNumber(NewVar, Context.getManglingNumber(OldVar));
4015 Context.setStaticLocalNumber(NewVar, Context.getStaticLocalNumber(OldVar));
4017 // Delay instantiation of the initializer for variable templates or inline
4018 // static data members until a definition of the variable is needed. We need
4019 // it right away if the type contains 'auto'.
4020 if ((!isa<VarTemplateSpecializationDecl>(NewVar) &&
4021 !InstantiatingVarTemplate &&
4022 !(OldVar->isInline() && OldVar->isThisDeclarationADefinition())) ||
4023 NewVar->getType()->isUndeducedType())
4024 InstantiateVariableInitializer(NewVar, OldVar, TemplateArgs);
4026 // Diagnose unused local variables with dependent types, where the diagnostic
4027 // will have been deferred.
4028 if (!NewVar->isInvalidDecl() &&
4029 NewVar->getDeclContext()->isFunctionOrMethod() &&
4030 OldVar->getType()->isDependentType())
4031 DiagnoseUnusedDecl(NewVar);
4034 /// \brief Instantiate the initializer of a variable.
4035 void Sema::InstantiateVariableInitializer(
4036 VarDecl *Var, VarDecl *OldVar,
4037 const MultiLevelTemplateArgumentList &TemplateArgs) {
4038 // We propagate the 'inline' flag with the initializer, because it
4039 // would otherwise imply that the variable is a definition for a
4040 // non-static data member.
4041 if (OldVar->isInlineSpecified())
4042 Var->setInlineSpecified();
4043 else if (OldVar->isInline())
4044 Var->setImplicitlyInline();
4046 if (OldVar->getInit()) {
4047 if (Var->isStaticDataMember() && !OldVar->isOutOfLine())
4048 PushExpressionEvaluationContext(Sema::ConstantEvaluated, OldVar);
4050 PushExpressionEvaluationContext(Sema::PotentiallyEvaluated, OldVar);
4052 // Instantiate the initializer.
4056 ContextRAII SwitchContext(*this, Var->getDeclContext());
4057 Init = SubstInitializer(OldVar->getInit(), TemplateArgs,
4058 OldVar->getInitStyle() == VarDecl::CallInit);
4061 if (!Init.isInvalid()) {
4062 bool TypeMayContainAuto = true;
4063 Expr *InitExpr = Init.get();
4065 if (Var->hasAttr<DLLImportAttr>() &&
4067 !InitExpr->isConstantInitializer(getASTContext(), false))) {
4068 // Do not dynamically initialize dllimport variables.
4069 } else if (InitExpr) {
4070 bool DirectInit = OldVar->isDirectInit();
4071 AddInitializerToDecl(Var, InitExpr, DirectInit, TypeMayContainAuto);
4073 ActOnUninitializedDecl(Var, TypeMayContainAuto);
4075 // FIXME: Not too happy about invalidating the declaration
4076 // because of a bogus initializer.
4077 Var->setInvalidDecl();
4080 PopExpressionEvaluationContext();
4082 if (Var->isStaticDataMember()) {
4083 if (!Var->isOutOfLine())
4086 // If the declaration inside the class had an initializer, don't add
4087 // another one to the out-of-line definition.
4088 if (OldVar->getFirstDecl()->hasInit())
4092 // We'll add an initializer to a for-range declaration later.
4093 if (Var->isCXXForRangeDecl())
4096 ActOnUninitializedDecl(Var, false);
4100 /// \brief Instantiate the definition of the given variable from its
4103 /// \param PointOfInstantiation the point at which the instantiation was
4104 /// required. Note that this is not precisely a "point of instantiation"
4105 /// for the function, but it's close.
4107 /// \param Var the already-instantiated declaration of a static member
4108 /// variable of a class template specialization.
4110 /// \param Recursive if true, recursively instantiates any functions that
4111 /// are required by this instantiation.
4113 /// \param DefinitionRequired if true, then we are performing an explicit
4114 /// instantiation where an out-of-line definition of the member variable
4115 /// is required. Complain if there is no such definition.
4116 void Sema::InstantiateStaticDataMemberDefinition(
4117 SourceLocation PointOfInstantiation,
4120 bool DefinitionRequired) {
4121 InstantiateVariableDefinition(PointOfInstantiation, Var, Recursive,
4122 DefinitionRequired);
4125 void Sema::InstantiateVariableDefinition(SourceLocation PointOfInstantiation,
4126 VarDecl *Var, bool Recursive,
4127 bool DefinitionRequired, bool AtEndOfTU) {
4128 if (Var->isInvalidDecl())
4131 VarTemplateSpecializationDecl *VarSpec =
4132 dyn_cast<VarTemplateSpecializationDecl>(Var);
4133 VarDecl *PatternDecl = nullptr, *Def = nullptr;
4134 MultiLevelTemplateArgumentList TemplateArgs =
4135 getTemplateInstantiationArgs(Var);
4138 // If this is a variable template specialization, make sure that it is
4139 // non-dependent, then find its instantiation pattern.
4140 bool InstantiationDependent = false;
4141 assert(!TemplateSpecializationType::anyDependentTemplateArguments(
4142 VarSpec->getTemplateArgsInfo(), InstantiationDependent) &&
4143 "Only instantiate variable template specializations that are "
4144 "not type-dependent");
4145 (void)InstantiationDependent;
4147 // Find the variable initialization that we'll be substituting. If the
4148 // pattern was instantiated from a member template, look back further to
4149 // find the real pattern.
4150 assert(VarSpec->getSpecializedTemplate() &&
4151 "Specialization without specialized template?");
4152 llvm::PointerUnion<VarTemplateDecl *,
4153 VarTemplatePartialSpecializationDecl *> PatternPtr =
4154 VarSpec->getSpecializedTemplateOrPartial();
4155 if (PatternPtr.is<VarTemplatePartialSpecializationDecl *>()) {
4156 VarTemplatePartialSpecializationDecl *Tmpl =
4157 PatternPtr.get<VarTemplatePartialSpecializationDecl *>();
4158 while (VarTemplatePartialSpecializationDecl *From =
4159 Tmpl->getInstantiatedFromMember()) {
4160 if (Tmpl->isMemberSpecialization())
4167 VarTemplateDecl *Tmpl = PatternPtr.get<VarTemplateDecl *>();
4168 while (VarTemplateDecl *From =
4169 Tmpl->getInstantiatedFromMemberTemplate()) {
4170 if (Tmpl->isMemberSpecialization())
4175 PatternDecl = Tmpl->getTemplatedDecl();
4178 // If this is a static data member template, there might be an
4179 // uninstantiated initializer on the declaration. If so, instantiate
4181 if (PatternDecl->isStaticDataMember() &&
4182 (PatternDecl = PatternDecl->getFirstDecl())->hasInit() &&
4184 // FIXME: Factor out the duplicated instantiation context setup/tear down
4186 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
4187 if (Inst.isInvalid() || Inst.isAlreadyInstantiating())
4189 PrettyDeclStackTraceEntry CrashInfo(*this, Var, SourceLocation(),
4190 "instantiating variable initializer");
4192 // The instantiation is visible here, even if it was first declared in an
4193 // unimported module.
4194 Var->setHidden(false);
4196 // If we're performing recursive template instantiation, create our own
4197 // queue of pending implicit instantiations that we will instantiate
4198 // later, while we're still within our own instantiation context.
4199 SavePendingInstantiationsAndVTableUsesRAII
4200 SavePendingInstantiationsAndVTableUses(*this, /*Enabled=*/Recursive);
4202 LocalInstantiationScope Local(*this);
4204 // Enter the scope of this instantiation. We don't use
4205 // PushDeclContext because we don't have a scope.
4206 ContextRAII PreviousContext(*this, Var->getDeclContext());
4207 InstantiateVariableInitializer(Var, PatternDecl, TemplateArgs);
4208 PreviousContext.pop();
4210 // FIXME: Need to inform the ASTConsumer that we instantiated the
4213 // This variable may have local implicit instantiations that need to be
4214 // instantiated within this scope.
4215 PerformPendingInstantiations(/*LocalOnly=*/true);
4220 // Define any newly required vtables.
4221 DefineUsedVTables();
4223 // Instantiate any pending implicit instantiations found during the
4224 // instantiation of this template.
4225 PerformPendingInstantiations();
4227 // PendingInstantiations and VTableUses are restored through
4228 // SavePendingInstantiationsAndVTableUses's destructor.
4232 // Find actual definition
4233 Def = PatternDecl->getDefinition(getASTContext());
4235 // If this is a static data member, find its out-of-line definition.
4236 assert(Var->isStaticDataMember() && "not a static data member?");
4237 PatternDecl = Var->getInstantiatedFromStaticDataMember();
4239 assert(PatternDecl && "data member was not instantiated from a template?");
4240 assert(PatternDecl->isStaticDataMember() && "not a static data member?");
4241 Def = PatternDecl->getDefinition();
4244 TemplateSpecializationKind TSK = Var->getTemplateSpecializationKind();
4246 // If we don't have a definition of the variable template, we won't perform
4247 // any instantiation. Rather, we rely on the user to instantiate this
4248 // definition (or provide a specialization for it) in another translation
4250 if (!Def && !DefinitionRequired) {
4251 if (TSK == TSK_ExplicitInstantiationDefinition) {
4252 PendingInstantiations.push_back(
4253 std::make_pair(Var, PointOfInstantiation));
4254 } else if (TSK == TSK_ImplicitInstantiation) {
4255 // Warn about missing definition at the end of translation unit.
4256 if (AtEndOfTU && !getDiagnostics().hasErrorOccurred()) {
4257 Diag(PointOfInstantiation, diag::warn_var_template_missing)
4259 Diag(PatternDecl->getLocation(), diag::note_forward_template_decl);
4260 if (getLangOpts().CPlusPlus11)
4261 Diag(PointOfInstantiation, diag::note_inst_declaration_hint) << Var;
4268 // FIXME: We need to track the instantiation stack in order to know which
4269 // definitions should be visible within this instantiation.
4270 // FIXME: Produce diagnostics when Var->getInstantiatedFromStaticDataMember().
4271 if (DiagnoseUninstantiableTemplate(PointOfInstantiation, Var,
4272 /*InstantiatedFromMember*/false,
4273 PatternDecl, Def, TSK,
4274 /*Complain*/DefinitionRequired))
4278 // Never instantiate an explicit specialization.
4279 if (TSK == TSK_ExplicitSpecialization)
4282 // C++11 [temp.explicit]p10:
4283 // Except for inline functions, [...] explicit instantiation declarations
4284 // have the effect of suppressing the implicit instantiation of the entity
4285 // to which they refer.
4286 if (TSK == TSK_ExplicitInstantiationDeclaration)
4289 // Make sure to pass the instantiated variable to the consumer at the end.
4290 struct PassToConsumerRAII {
4291 ASTConsumer &Consumer;
4294 PassToConsumerRAII(ASTConsumer &Consumer, VarDecl *Var)
4295 : Consumer(Consumer), Var(Var) { }
4297 ~PassToConsumerRAII() {
4298 Consumer.HandleCXXStaticMemberVarInstantiation(Var);
4300 } PassToConsumerRAII(Consumer, Var);
4302 // If we already have a definition, we're done.
4303 if (VarDecl *Def = Var->getDefinition()) {
4304 // We may be explicitly instantiating something we've already implicitly
4306 Def->setTemplateSpecializationKind(Var->getTemplateSpecializationKind(),
4307 PointOfInstantiation);
4311 InstantiatingTemplate Inst(*this, PointOfInstantiation, Var);
4312 if (Inst.isInvalid() || Inst.isAlreadyInstantiating())
4314 PrettyDeclStackTraceEntry CrashInfo(*this, Var, SourceLocation(),
4315 "instantiating variable definition");
4317 // If we're performing recursive template instantiation, create our own
4318 // queue of pending implicit instantiations that we will instantiate later,
4319 // while we're still within our own instantiation context.
4320 SavePendingLocalImplicitInstantiationsRAII
4321 SavedPendingLocalImplicitInstantiations(*this);
4322 SavePendingInstantiationsAndVTableUsesRAII
4323 SavePendingInstantiationsAndVTableUses(*this, /*Enabled=*/Recursive);
4325 // Enter the scope of this instantiation. We don't use
4326 // PushDeclContext because we don't have a scope.
4327 ContextRAII PreviousContext(*this, Var->getDeclContext());
4328 LocalInstantiationScope Local(*this);
4330 VarDecl *OldVar = Var;
4331 if (Def->isStaticDataMember() && !Def->isOutOfLine()) {
4332 // We're instantiating an inline static data member whose definition was
4333 // provided inside the class.
4334 // FIXME: Update record?
4335 InstantiateVariableInitializer(Var, Def, TemplateArgs);
4336 } else if (!VarSpec) {
4337 Var = cast_or_null<VarDecl>(SubstDecl(Def, Var->getDeclContext(),
4339 } else if (Var->isStaticDataMember() &&
4340 Var->getLexicalDeclContext()->isRecord()) {
4341 // We need to instantiate the definition of a static data member template,
4342 // and all we have is the in-class declaration of it. Instantiate a separate
4343 // declaration of the definition.
4344 TemplateDeclInstantiator Instantiator(*this, Var->getDeclContext(),
4346 Var = cast_or_null<VarDecl>(Instantiator.VisitVarTemplateSpecializationDecl(
4347 VarSpec->getSpecializedTemplate(), Def, nullptr,
4348 VarSpec->getTemplateArgsInfo(), VarSpec->getTemplateArgs().asArray()));
4350 llvm::PointerUnion<VarTemplateDecl *,
4351 VarTemplatePartialSpecializationDecl *> PatternPtr =
4352 VarSpec->getSpecializedTemplateOrPartial();
4353 if (VarTemplatePartialSpecializationDecl *Partial =
4354 PatternPtr.dyn_cast<VarTemplatePartialSpecializationDecl *>())
4355 cast<VarTemplateSpecializationDecl>(Var)->setInstantiationOf(
4356 Partial, &VarSpec->getTemplateInstantiationArgs());
4358 // Merge the definition with the declaration.
4359 LookupResult R(*this, Var->getDeclName(), Var->getLocation(),
4360 LookupOrdinaryName, ForRedeclaration);
4362 MergeVarDecl(Var, R);
4364 // Attach the initializer.
4365 InstantiateVariableInitializer(Var, Def, TemplateArgs);
4368 // Complete the existing variable's definition with an appropriately
4369 // substituted type and initializer.
4370 Var = CompleteVarTemplateSpecializationDecl(VarSpec, Def, TemplateArgs);
4372 PreviousContext.pop();
4375 PassToConsumerRAII.Var = Var;
4376 Var->setTemplateSpecializationKind(OldVar->getTemplateSpecializationKind(),
4377 OldVar->getPointOfInstantiation());
4380 // This variable may have local implicit instantiations that need to be
4381 // instantiated within this scope.
4382 PerformPendingInstantiations(/*LocalOnly=*/true);
4387 // Define any newly required vtables.
4388 DefineUsedVTables();
4390 // Instantiate any pending implicit instantiations found during the
4391 // instantiation of this template.
4392 PerformPendingInstantiations();
4394 // PendingInstantiations and VTableUses are restored through
4395 // SavePendingInstantiationsAndVTableUses's destructor.
4400 Sema::InstantiateMemInitializers(CXXConstructorDecl *New,
4401 const CXXConstructorDecl *Tmpl,
4402 const MultiLevelTemplateArgumentList &TemplateArgs) {
4404 SmallVector<CXXCtorInitializer*, 4> NewInits;
4405 bool AnyErrors = Tmpl->isInvalidDecl();
4407 // Instantiate all the initializers.
4408 for (const auto *Init : Tmpl->inits()) {
4409 // Only instantiate written initializers, let Sema re-construct implicit
4411 if (!Init->isWritten())
4414 SourceLocation EllipsisLoc;
4416 if (Init->isPackExpansion()) {
4417 // This is a pack expansion. We should expand it now.
4418 TypeLoc BaseTL = Init->getTypeSourceInfo()->getTypeLoc();
4419 SmallVector<UnexpandedParameterPack, 4> Unexpanded;
4420 collectUnexpandedParameterPacks(BaseTL, Unexpanded);
4421 collectUnexpandedParameterPacks(Init->getInit(), Unexpanded);
4422 bool ShouldExpand = false;
4423 bool RetainExpansion = false;
4424 Optional<unsigned> NumExpansions;
4425 if (CheckParameterPacksForExpansion(Init->getEllipsisLoc(),
4426 BaseTL.getSourceRange(),
4428 TemplateArgs, ShouldExpand,
4432 New->setInvalidDecl();
4435 assert(ShouldExpand && "Partial instantiation of base initializer?");
4437 // Loop over all of the arguments in the argument pack(s),
4438 for (unsigned I = 0; I != *NumExpansions; ++I) {
4439 Sema::ArgumentPackSubstitutionIndexRAII SubstIndex(*this, I);
4441 // Instantiate the initializer.
4442 ExprResult TempInit = SubstInitializer(Init->getInit(), TemplateArgs,
4443 /*CXXDirectInit=*/true);
4444 if (TempInit.isInvalid()) {
4449 // Instantiate the base type.
4450 TypeSourceInfo *BaseTInfo = SubstType(Init->getTypeSourceInfo(),
4452 Init->getSourceLocation(),
4453 New->getDeclName());
4459 // Build the initializer.
4460 MemInitResult NewInit = BuildBaseInitializer(BaseTInfo->getType(),
4461 BaseTInfo, TempInit.get(),
4464 if (NewInit.isInvalid()) {
4469 NewInits.push_back(NewInit.get());
4475 // Instantiate the initializer.
4476 ExprResult TempInit = SubstInitializer(Init->getInit(), TemplateArgs,
4477 /*CXXDirectInit=*/true);
4478 if (TempInit.isInvalid()) {
4483 MemInitResult NewInit;
4484 if (Init->isDelegatingInitializer() || Init->isBaseInitializer()) {
4485 TypeSourceInfo *TInfo = SubstType(Init->getTypeSourceInfo(),
4487 Init->getSourceLocation(),
4488 New->getDeclName());
4491 New->setInvalidDecl();
4495 if (Init->isBaseInitializer())
4496 NewInit = BuildBaseInitializer(TInfo->getType(), TInfo, TempInit.get(),
4497 New->getParent(), EllipsisLoc);
4499 NewInit = BuildDelegatingInitializer(TInfo, TempInit.get(),
4500 cast<CXXRecordDecl>(CurContext->getParent()));
4501 } else if (Init->isMemberInitializer()) {
4502 FieldDecl *Member = cast_or_null<FieldDecl>(FindInstantiatedDecl(
4503 Init->getMemberLocation(),
4508 New->setInvalidDecl();
4512 NewInit = BuildMemberInitializer(Member, TempInit.get(),
4513 Init->getSourceLocation());
4514 } else if (Init->isIndirectMemberInitializer()) {
4515 IndirectFieldDecl *IndirectMember =
4516 cast_or_null<IndirectFieldDecl>(FindInstantiatedDecl(
4517 Init->getMemberLocation(),
4518 Init->getIndirectMember(), TemplateArgs));
4520 if (!IndirectMember) {
4522 New->setInvalidDecl();
4526 NewInit = BuildMemberInitializer(IndirectMember, TempInit.get(),
4527 Init->getSourceLocation());
4530 if (NewInit.isInvalid()) {
4532 New->setInvalidDecl();
4534 NewInits.push_back(NewInit.get());
4538 // Assign all the initializers to the new constructor.
4539 ActOnMemInitializers(New,
4540 /*FIXME: ColonLoc */
4546 // TODO: this could be templated if the various decl types used the
4547 // same method name.
4548 static bool isInstantiationOf(ClassTemplateDecl *Pattern,
4549 ClassTemplateDecl *Instance) {
4550 Pattern = Pattern->getCanonicalDecl();
4553 Instance = Instance->getCanonicalDecl();
4554 if (Pattern == Instance) return true;
4555 Instance = Instance->getInstantiatedFromMemberTemplate();
4561 static bool isInstantiationOf(FunctionTemplateDecl *Pattern,
4562 FunctionTemplateDecl *Instance) {
4563 Pattern = Pattern->getCanonicalDecl();
4566 Instance = Instance->getCanonicalDecl();
4567 if (Pattern == Instance) return true;
4568 Instance = Instance->getInstantiatedFromMemberTemplate();
4575 isInstantiationOf(ClassTemplatePartialSpecializationDecl *Pattern,
4576 ClassTemplatePartialSpecializationDecl *Instance) {
4578 = cast<ClassTemplatePartialSpecializationDecl>(Pattern->getCanonicalDecl());
4580 Instance = cast<ClassTemplatePartialSpecializationDecl>(
4581 Instance->getCanonicalDecl());
4582 if (Pattern == Instance)
4584 Instance = Instance->getInstantiatedFromMember();
4590 static bool isInstantiationOf(CXXRecordDecl *Pattern,
4591 CXXRecordDecl *Instance) {
4592 Pattern = Pattern->getCanonicalDecl();
4595 Instance = Instance->getCanonicalDecl();
4596 if (Pattern == Instance) return true;
4597 Instance = Instance->getInstantiatedFromMemberClass();
4603 static bool isInstantiationOf(FunctionDecl *Pattern,
4604 FunctionDecl *Instance) {
4605 Pattern = Pattern->getCanonicalDecl();
4608 Instance = Instance->getCanonicalDecl();
4609 if (Pattern == Instance) return true;
4610 Instance = Instance->getInstantiatedFromMemberFunction();
4616 static bool isInstantiationOf(EnumDecl *Pattern,
4617 EnumDecl *Instance) {
4618 Pattern = Pattern->getCanonicalDecl();
4621 Instance = Instance->getCanonicalDecl();
4622 if (Pattern == Instance) return true;
4623 Instance = Instance->getInstantiatedFromMemberEnum();
4629 static bool isInstantiationOf(UsingShadowDecl *Pattern,
4630 UsingShadowDecl *Instance,
4632 return declaresSameEntity(C.getInstantiatedFromUsingShadowDecl(Instance),
4636 static bool isInstantiationOf(UsingDecl *Pattern, UsingDecl *Instance,
4638 return declaresSameEntity(C.getInstantiatedFromUsingDecl(Instance), Pattern);
4641 template<typename T>
4642 static bool isInstantiationOfUnresolvedUsingDecl(T *Pattern, Decl *Other,
4644 // An unresolved using declaration can instantiate to an unresolved using
4645 // declaration, or to a using declaration or a using declaration pack.
4647 // Multiple declarations can claim to be instantiated from an unresolved
4648 // using declaration if it's a pack expansion. We want the UsingPackDecl
4649 // in that case, not the individual UsingDecls within the pack.
4650 bool OtherIsPackExpansion;
4651 NamedDecl *OtherFrom;
4652 if (auto *OtherUUD = dyn_cast<T>(Other)) {
4653 OtherIsPackExpansion = OtherUUD->isPackExpansion();
4654 OtherFrom = Ctx.getInstantiatedFromUsingDecl(OtherUUD);
4655 } else if (auto *OtherUPD = dyn_cast<UsingPackDecl>(Other)) {
4656 OtherIsPackExpansion = true;
4657 OtherFrom = OtherUPD->getInstantiatedFromUsingDecl();
4658 } else if (auto *OtherUD = dyn_cast<UsingDecl>(Other)) {
4659 OtherIsPackExpansion = false;
4660 OtherFrom = Ctx.getInstantiatedFromUsingDecl(OtherUD);
4664 return Pattern->isPackExpansion() == OtherIsPackExpansion &&
4665 declaresSameEntity(OtherFrom, Pattern);
4668 static bool isInstantiationOfStaticDataMember(VarDecl *Pattern,
4669 VarDecl *Instance) {
4670 assert(Instance->isStaticDataMember());
4672 Pattern = Pattern->getCanonicalDecl();
4675 Instance = Instance->getCanonicalDecl();
4676 if (Pattern == Instance) return true;
4677 Instance = Instance->getInstantiatedFromStaticDataMember();
4683 // Other is the prospective instantiation
4684 // D is the prospective pattern
4685 static bool isInstantiationOf(ASTContext &Ctx, NamedDecl *D, Decl *Other) {
4686 if (auto *UUD = dyn_cast<UnresolvedUsingTypenameDecl>(D))
4687 return isInstantiationOfUnresolvedUsingDecl(UUD, Other, Ctx);
4689 if (auto *UUD = dyn_cast<UnresolvedUsingValueDecl>(D))
4690 return isInstantiationOfUnresolvedUsingDecl(UUD, Other, Ctx);
4692 if (D->getKind() != Other->getKind())
4695 if (auto *Record = dyn_cast<CXXRecordDecl>(Other))
4696 return isInstantiationOf(cast<CXXRecordDecl>(D), Record);
4698 if (auto *Function = dyn_cast<FunctionDecl>(Other))
4699 return isInstantiationOf(cast<FunctionDecl>(D), Function);
4701 if (auto *Enum = dyn_cast<EnumDecl>(Other))
4702 return isInstantiationOf(cast<EnumDecl>(D), Enum);
4704 if (auto *Var = dyn_cast<VarDecl>(Other))
4705 if (Var->isStaticDataMember())
4706 return isInstantiationOfStaticDataMember(cast<VarDecl>(D), Var);
4708 if (auto *Temp = dyn_cast<ClassTemplateDecl>(Other))
4709 return isInstantiationOf(cast<ClassTemplateDecl>(D), Temp);
4711 if (auto *Temp = dyn_cast<FunctionTemplateDecl>(Other))
4712 return isInstantiationOf(cast<FunctionTemplateDecl>(D), Temp);
4714 if (auto *PartialSpec =
4715 dyn_cast<ClassTemplatePartialSpecializationDecl>(Other))
4716 return isInstantiationOf(cast<ClassTemplatePartialSpecializationDecl>(D),
4719 if (auto *Field = dyn_cast<FieldDecl>(Other)) {
4720 if (!Field->getDeclName()) {
4721 // This is an unnamed field.
4722 return declaresSameEntity(Ctx.getInstantiatedFromUnnamedFieldDecl(Field),
4723 cast<FieldDecl>(D));
4727 if (auto *Using = dyn_cast<UsingDecl>(Other))
4728 return isInstantiationOf(cast<UsingDecl>(D), Using, Ctx);
4730 if (auto *Shadow = dyn_cast<UsingShadowDecl>(Other))
4731 return isInstantiationOf(cast<UsingShadowDecl>(D), Shadow, Ctx);
4733 return D->getDeclName() &&
4734 D->getDeclName() == cast<NamedDecl>(Other)->getDeclName();
4737 template<typename ForwardIterator>
4738 static NamedDecl *findInstantiationOf(ASTContext &Ctx,
4740 ForwardIterator first,
4741 ForwardIterator last) {
4742 for (; first != last; ++first)
4743 if (isInstantiationOf(Ctx, D, *first))
4744 return cast<NamedDecl>(*first);
4749 /// \brief Finds the instantiation of the given declaration context
4750 /// within the current instantiation.
4752 /// \returns NULL if there was an error
4753 DeclContext *Sema::FindInstantiatedContext(SourceLocation Loc, DeclContext* DC,
4754 const MultiLevelTemplateArgumentList &TemplateArgs) {
4755 if (NamedDecl *D = dyn_cast<NamedDecl>(DC)) {
4756 Decl* ID = FindInstantiatedDecl(Loc, D, TemplateArgs);
4757 return cast_or_null<DeclContext>(ID);
4761 /// \brief Find the instantiation of the given declaration within the
4762 /// current instantiation.
4764 /// This routine is intended to be used when \p D is a declaration
4765 /// referenced from within a template, that needs to mapped into the
4766 /// corresponding declaration within an instantiation. For example,
4770 /// template<typename T>
4773 /// KnownValue = sizeof(T)
4776 /// bool getKind() const { return KnownValue; }
4779 /// template struct X<int>;
4782 /// In the instantiation of <tt>X<int>::getKind()</tt>, we need to map the
4783 /// \p EnumConstantDecl for \p KnownValue (which refers to
4784 /// <tt>X<T>::<Kind>::KnownValue</tt>) to its instantiation
4785 /// (<tt>X<int>::<Kind>::KnownValue</tt>). \p FindInstantiatedDecl performs
4786 /// this mapping from within the instantiation of <tt>X<int></tt>.
4787 NamedDecl *Sema::FindInstantiatedDecl(SourceLocation Loc, NamedDecl *D,
4788 const MultiLevelTemplateArgumentList &TemplateArgs) {
4789 DeclContext *ParentDC = D->getDeclContext();
4790 // FIXME: Parmeters of pointer to functions (y below) that are themselves
4791 // parameters (p below) can have their ParentDC set to the translation-unit
4792 // - thus we can not consistently check if the ParentDC of such a parameter
4793 // is Dependent or/and a FunctionOrMethod.
4794 // For e.g. this code, during Template argument deduction tries to
4795 // find an instantiated decl for (T y) when the ParentDC for y is
4796 // the translation unit.
4797 // e.g. template <class T> void Foo(auto (*p)(T y) -> decltype(y())) {}
4798 // float baz(float(*)()) { return 0.0; }
4800 // The better fix here is perhaps to ensure that a ParmVarDecl, by the time
4801 // it gets here, always has a FunctionOrMethod as its ParentDC??
4803 // - as long as we have a ParmVarDecl whose parent is non-dependent and
4804 // whose type is not instantiation dependent, do nothing to the decl
4805 // - otherwise find its instantiated decl.
4806 if (isa<ParmVarDecl>(D) && !ParentDC->isDependentContext() &&
4807 !cast<ParmVarDecl>(D)->getType()->isInstantiationDependentType())
4809 if (isa<ParmVarDecl>(D) || isa<NonTypeTemplateParmDecl>(D) ||
4810 isa<TemplateTypeParmDecl>(D) || isa<TemplateTemplateParmDecl>(D) ||
4811 (ParentDC->isFunctionOrMethod() && ParentDC->isDependentContext()) ||
4812 (isa<CXXRecordDecl>(D) && cast<CXXRecordDecl>(D)->isLambda())) {
4813 // D is a local of some kind. Look into the map of local
4814 // declarations to their instantiations.
4815 if (CurrentInstantiationScope) {
4816 if (auto Found = CurrentInstantiationScope->findInstantiationOf(D)) {
4817 if (Decl *FD = Found->dyn_cast<Decl *>())
4818 return cast<NamedDecl>(FD);
4820 int PackIdx = ArgumentPackSubstitutionIndex;
4821 assert(PackIdx != -1 &&
4822 "found declaration pack but not pack expanding");
4823 typedef LocalInstantiationScope::DeclArgumentPack DeclArgumentPack;
4824 return cast<NamedDecl>((*Found->get<DeclArgumentPack *>())[PackIdx]);
4828 // If we're performing a partial substitution during template argument
4829 // deduction, we may not have values for template parameters yet. They
4830 // just map to themselves.
4831 if (isa<NonTypeTemplateParmDecl>(D) || isa<TemplateTypeParmDecl>(D) ||
4832 isa<TemplateTemplateParmDecl>(D))
4835 if (D->isInvalidDecl())
4838 // Normally this function only searches for already instantiated declaration
4839 // however we have to make an exclusion for local types used before
4840 // definition as in the code:
4842 // template<typename T> void f1() {
4843 // void g1(struct x1);
4847 // In this case instantiation of the type of 'g1' requires definition of
4848 // 'x1', which is defined later. Error recovery may produce an enum used
4849 // before definition. In these cases we need to instantiate relevant
4850 // declarations here.
4851 bool NeedInstantiate = false;
4852 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(D))
4853 NeedInstantiate = RD->isLocalClass();
4855 NeedInstantiate = isa<EnumDecl>(D);
4856 if (NeedInstantiate) {
4857 Decl *Inst = SubstDecl(D, CurContext, TemplateArgs);
4858 CurrentInstantiationScope->InstantiatedLocal(D, Inst);
4859 return cast<TypeDecl>(Inst);
4862 // If we didn't find the decl, then we must have a label decl that hasn't
4863 // been found yet. Lazily instantiate it and return it now.
4864 assert(isa<LabelDecl>(D));
4866 Decl *Inst = SubstDecl(D, CurContext, TemplateArgs);
4867 assert(Inst && "Failed to instantiate label??");
4869 CurrentInstantiationScope->InstantiatedLocal(D, Inst);
4870 return cast<LabelDecl>(Inst);
4873 // For variable template specializations, update those that are still
4875 if (VarTemplateSpecializationDecl *VarSpec =
4876 dyn_cast<VarTemplateSpecializationDecl>(D)) {
4877 bool InstantiationDependent = false;
4878 const TemplateArgumentListInfo &VarTemplateArgs =
4879 VarSpec->getTemplateArgsInfo();
4880 if (TemplateSpecializationType::anyDependentTemplateArguments(
4881 VarTemplateArgs, InstantiationDependent))
4882 D = cast<NamedDecl>(
4883 SubstDecl(D, VarSpec->getDeclContext(), TemplateArgs));
4887 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(D)) {
4888 if (!Record->isDependentContext())
4891 // Determine whether this record is the "templated" declaration describing
4892 // a class template or class template partial specialization.
4893 ClassTemplateDecl *ClassTemplate = Record->getDescribedClassTemplate();
4895 ClassTemplate = ClassTemplate->getCanonicalDecl();
4896 else if (ClassTemplatePartialSpecializationDecl *PartialSpec
4897 = dyn_cast<ClassTemplatePartialSpecializationDecl>(Record))
4898 ClassTemplate = PartialSpec->getSpecializedTemplate()->getCanonicalDecl();
4900 // Walk the current context to find either the record or an instantiation of
4902 DeclContext *DC = CurContext;
4903 while (!DC->isFileContext()) {
4904 // If we're performing substitution while we're inside the template
4905 // definition, we'll find our own context. We're done.
4906 if (DC->Equals(Record))
4909 if (CXXRecordDecl *InstRecord = dyn_cast<CXXRecordDecl>(DC)) {
4910 // Check whether we're in the process of instantiating a class template
4911 // specialization of the template we're mapping.
4912 if (ClassTemplateSpecializationDecl *InstSpec
4913 = dyn_cast<ClassTemplateSpecializationDecl>(InstRecord)){
4914 ClassTemplateDecl *SpecTemplate = InstSpec->getSpecializedTemplate();
4915 if (ClassTemplate && isInstantiationOf(ClassTemplate, SpecTemplate))
4919 // Check whether we're in the process of instantiating a member class.
4920 if (isInstantiationOf(Record, InstRecord))
4924 // Move to the outer template scope.
4925 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(DC)) {
4926 if (FD->getFriendObjectKind() && FD->getDeclContext()->isFileContext()){
4927 DC = FD->getLexicalDeclContext();
4932 DC = DC->getParent();
4935 // Fall through to deal with other dependent record types (e.g.,
4936 // anonymous unions in class templates).
4939 if (!ParentDC->isDependentContext())
4942 ParentDC = FindInstantiatedContext(Loc, ParentDC, TemplateArgs);
4946 if (ParentDC != D->getDeclContext()) {
4947 // We performed some kind of instantiation in the parent context,
4948 // so now we need to look into the instantiated parent context to
4949 // find the instantiation of the declaration D.
4951 // If our context used to be dependent, we may need to instantiate
4952 // it before performing lookup into that context.
4953 bool IsBeingInstantiated = false;
4954 if (CXXRecordDecl *Spec = dyn_cast<CXXRecordDecl>(ParentDC)) {
4955 if (!Spec->isDependentContext()) {
4956 QualType T = Context.getTypeDeclType(Spec);
4957 const RecordType *Tag = T->getAs<RecordType>();
4958 assert(Tag && "type of non-dependent record is not a RecordType");
4959 if (Tag->isBeingDefined())
4960 IsBeingInstantiated = true;
4961 if (!Tag->isBeingDefined() &&
4962 RequireCompleteType(Loc, T, diag::err_incomplete_type))
4965 ParentDC = Tag->getDecl();
4969 NamedDecl *Result = nullptr;
4970 // FIXME: If the name is a dependent name, this lookup won't necessarily
4971 // find it. Does that ever matter?
4972 if (D->getDeclName()) {
4973 DeclContext::lookup_result Found = ParentDC->lookup(D->getDeclName());
4974 Result = findInstantiationOf(Context, D, Found.begin(), Found.end());
4976 // Since we don't have a name for the entity we're looking for,
4977 // our only option is to walk through all of the declarations to
4978 // find that name. This will occur in a few cases:
4980 // - anonymous struct/union within a template
4981 // - unnamed class/struct/union/enum within a template
4983 // FIXME: Find a better way to find these instantiations!
4984 Result = findInstantiationOf(Context, D,
4985 ParentDC->decls_begin(),
4986 ParentDC->decls_end());
4990 if (isa<UsingShadowDecl>(D)) {
4991 // UsingShadowDecls can instantiate to nothing because of using hiding.
4992 } else if (Diags.hasErrorOccurred()) {
4993 // We've already complained about something, so most likely this
4994 // declaration failed to instantiate. There's no point in complaining
4995 // further, since this is normal in invalid code.
4996 } else if (IsBeingInstantiated) {
4997 // The class in which this member exists is currently being
4998 // instantiated, and we haven't gotten around to instantiating this
4999 // member yet. This can happen when the code uses forward declarations
5000 // of member classes, and introduces ordering dependencies via
5001 // template instantiation.
5002 Diag(Loc, diag::err_member_not_yet_instantiated)
5004 << Context.getTypeDeclType(cast<CXXRecordDecl>(ParentDC));
5005 Diag(D->getLocation(), diag::note_non_instantiated_member_here);
5006 } else if (EnumConstantDecl *ED = dyn_cast<EnumConstantDecl>(D)) {
5007 // This enumeration constant was found when the template was defined,
5008 // but can't be found in the instantiation. This can happen if an
5009 // unscoped enumeration member is explicitly specialized.
5010 EnumDecl *Enum = cast<EnumDecl>(ED->getLexicalDeclContext());
5011 EnumDecl *Spec = cast<EnumDecl>(FindInstantiatedDecl(Loc, Enum,
5013 assert(Spec->getTemplateSpecializationKind() ==
5014 TSK_ExplicitSpecialization);
5015 Diag(Loc, diag::err_enumerator_does_not_exist)
5017 << Context.getTypeDeclType(cast<TypeDecl>(Spec->getDeclContext()));
5018 Diag(Spec->getLocation(), diag::note_enum_specialized_here)
5019 << Context.getTypeDeclType(Spec);
5021 // We should have found something, but didn't.
5022 llvm_unreachable("Unable to find instantiation of declaration!");
5032 /// \brief Performs template instantiation for all implicit template
5033 /// instantiations we have seen until this point.
5034 void Sema::PerformPendingInstantiations(bool LocalOnly) {
5035 while (!PendingLocalImplicitInstantiations.empty() ||
5036 (!LocalOnly && !PendingInstantiations.empty())) {
5037 PendingImplicitInstantiation Inst;
5039 if (PendingLocalImplicitInstantiations.empty()) {
5040 Inst = PendingInstantiations.front();
5041 PendingInstantiations.pop_front();
5043 Inst = PendingLocalImplicitInstantiations.front();
5044 PendingLocalImplicitInstantiations.pop_front();
5047 // Instantiate function definitions
5048 if (FunctionDecl *Function = dyn_cast<FunctionDecl>(Inst.first)) {
5049 bool DefinitionRequired = Function->getTemplateSpecializationKind() ==
5050 TSK_ExplicitInstantiationDefinition;
5051 InstantiateFunctionDefinition(/*FIXME:*/Inst.second, Function, true,
5052 DefinitionRequired, true);
5056 // Instantiate variable definitions
5057 VarDecl *Var = cast<VarDecl>(Inst.first);
5059 assert((Var->isStaticDataMember() ||
5060 isa<VarTemplateSpecializationDecl>(Var)) &&
5061 "Not a static data member, nor a variable template"
5062 " specialization?");
5064 // Don't try to instantiate declarations if the most recent redeclaration
5066 if (Var->getMostRecentDecl()->isInvalidDecl())
5069 // Check if the most recent declaration has changed the specialization kind
5070 // and removed the need for implicit instantiation.
5071 switch (Var->getMostRecentDecl()->getTemplateSpecializationKind()) {
5072 case TSK_Undeclared:
5073 llvm_unreachable("Cannot instantitiate an undeclared specialization.");
5074 case TSK_ExplicitInstantiationDeclaration:
5075 case TSK_ExplicitSpecialization:
5076 continue; // No longer need to instantiate this type.
5077 case TSK_ExplicitInstantiationDefinition:
5078 // We only need an instantiation if the pending instantiation *is* the
5079 // explicit instantiation.
5080 if (Var != Var->getMostRecentDecl()) continue;
5081 case TSK_ImplicitInstantiation:
5085 PrettyDeclStackTraceEntry CrashInfo(*this, Var, SourceLocation(),
5086 "instantiating variable definition");
5087 bool DefinitionRequired = Var->getTemplateSpecializationKind() ==
5088 TSK_ExplicitInstantiationDefinition;
5090 // Instantiate static data member definitions or variable template
5092 InstantiateVariableDefinition(/*FIXME:*/ Inst.second, Var, true,
5093 DefinitionRequired, true);
5097 void Sema::PerformDependentDiagnostics(const DeclContext *Pattern,
5098 const MultiLevelTemplateArgumentList &TemplateArgs) {
5099 for (auto DD : Pattern->ddiags()) {
5100 switch (DD->getKind()) {
5101 case DependentDiagnostic::Access:
5102 HandleDependentAccessCheck(*DD, TemplateArgs);