[JExtract/JNI] Support optionals in JNI mode #340
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Adds support for optional return types and parameters in JNI mode of JExtract.
The overall idea for the conversion is that we use a "discriminator", which is a
byte :0or1` indicating whether the parameter or return value is present.For parameters we pass in the discriminator as an additional parameter.
Returning Integral types
Returning any type that can fit inside a bigger primitive integer type, we widen that type and store the discriminator at the end.
So for example, returning
Optional<Int8>, the underlying JNI would return ashort, which isbyte || byte. The above means that this method is used for(U)Int8, (U)Int16, (U)Int32.Other types
For any other types we do an indirect return to return the value of the discriminator.