Google has open sourced J2ObjC, a transpiler converting Java source code to Objective-C/C++ source code for the iOS platform.

Here's what I've learned over 20 years of working with both C++ and Java (and more years before that with C++): As a rule of thumb, when you convert optimized C++ to Java, the code is about 3x ...

For Super Mario 64, Nintendo compiled its source code without any fancy compiler options, meaning the decompiled assembly language is simpler to convert back to C code.