ART/Dalvik don't implement it, but Java ways for many languages to interop with each other for a long time already and is pushing the limits on that even further. The C calling convention as the lowest common denominator for language interop has been fading away for some time now already. Targeting the Java ABIs/calling conventions gives you access to both C libraries via things like JNI/JNA and also Python, JavaScript, Scala, Haskell (Frege), etc.