================
@@ -19109,7 +19119,17 @@ bool Sema::DefineUsedVTables() {
}
}
- if (IsExplicitInstantiationDeclaration)
+ if (IsExplicitInstantiationDeclaration &&
+ llvm::none_of(Class->decls(), [](Decl *decl) {
+ // If the class has a virtual member function declared with
+ // `__attribute__((exclude_from_explicit_instantiation))`, the
+ // explicit instantiation declaration shouldn't suppress emitting
+ // the vtable to ensure that the excluded member function is
+ // accessible through the vtable.
+ auto *Method = dyn_cast<CXXMethodDecl>(decl);
+ return Method && Method->isVirtual() &&
+ Method->hasAttr<ExcludeFromExplicitInstantiationAttr>();
+ }))
----------------
zmodem wrote:
> I don't understand why non-virtual functions matter here.
A constructor method may trigger emitting the vtable. The larger point is that
the reasoning on lines 19095-190198 about the "vtable will live with the
explicit instantiation" doesn't necessarily hold if some methods are excluded
from explicit instantiation.
https://github.com/llvm/llvm-project/pull/168171
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