Does JetBrains MPS provide an JIT compiler which can be used inside other applications? We have a legacy application with its on script language. Because this script language is very difficult to use to our customer, we would like to provide a new DSL to them.
So the question is: Can we use Jetbrains MPS to design our DSL and then use the MPS JITCompiler/Translator to transform it to Java or whatever after the user wrote his script in our Software?
If you mean by JITCompiler/Translator, to take your DSL generate Java from it and then run that compiled java code, yes that is possible. But it would be an extra transformation step like: write code -> generate/compile -> run (the resulting jar).
If you mean interpreting the model without doing a transformation step first then the answer is, not out of the box. We have build a interpreter framework for MPS and build two interpreters with it so far. One for Java and one for C. Though the focus is not on performance there. We use it for small calculations in formulas or REPL like things. It is currently work in progress but work quite nice. You can look here for Interpreter and find some more information and where to look. As a midterm project we might want to integrate this interpreter definition with the Graal compiler which would then be much more a JITCompiler then just a interpreter.