================
@@ -4725,12 +4725,62 @@ Decl
*TemplateDeclInstantiator::VisitObjCAtDefsFieldDecl(ObjCAtDefsFieldDecl *D)
}
Decl *TemplateDeclInstantiator::VisitFriendTemplateDecl(FriendTemplateDecl *D)
{
- // FIXME: We need to be able to instantiate FriendTemplateDecls.
- unsigned DiagID = SemaRef.getDiagnostics().getCustomDiagID(
- DiagnosticsEngine::Error,
- "cannot instantiate %0 yet");
- SemaRef.Diag(D->getLocation(), DiagID)
- << D->getDeclKindName();
+ ArrayRef<TemplateParameterList *> TPLists =
+ D->getFriendTypeTemplateParameterLists();
+
+ Decl *FTD = nullptr;
+ if (TypeSourceInfo *FT = D->getFriendType()) {
+ if (D->isPackExpansion() && InstantiateFriendPackExpansion(D, FT, TPLists))
+ return nullptr;
+
+ SmallVector<TemplateParameterList *, 1> TPL;
+ if (SubstTemplateParameterLists(TPLists, TPL))
+ return nullptr;
+
+ ClassTemplateDecl *CTD = nullptr;
+ if (auto DNT = FT->getTypeLoc().getAs<DependentNameTypeLoc>()) {
+ NestedNameSpecifierLoc QualifierLoc =
SemaRef.SubstNestedNameSpecifierLoc(
+ DNT.getQualifierLoc(), TemplateArgs);
+ if (QualifierLoc) {
+ CXXScopeSpec SS;
+ SS.Adopt(QualifierLoc);
+
+ DeclContext *DC =
+ SemaRef.computeDeclContext(SS, /*EnteringContext=*/true);
+ if (DC) {
+ LookupResult Result(SemaRef, DNT.getTypePtr()->getIdentifier(),
+ DNT.getNameLoc(), Sema::LookupOrdinaryName,
+ SemaRef.forRedeclarationInCurContext());
+ SemaRef.LookupQualifiedName(Result, DC);
+ CTD = Result.getAsSingle<ClassTemplateDecl>();
----------------
mizvekov wrote:
There is a lot that could be going on here, that this seemingly doesn't handle.
For example, what if the class is found through a UsingDecl?
Also, shouldn't the FriendTemplate also store the Qualifier?
It would e useful if the FriendTemplateDecl could preserve that.
A TemplateName can represent all of that, maybe the FriendTemplateDecl should
just use that instead of the TemplateDecl directly?
https://github.com/llvm/llvm-project/pull/191268
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