miniKanren is a logic/relational language. It's been used to solve questions related to programs. For example, once you give miniKanren a description of the untyped λ-calculus extended with integers you can ask it "give me programs that result in 2" and it'll enumerate programs from the constant "2" to "1 + 1" to more complicated versions using λ-expressions. It can even find quines (if the described language supports it).

http://minikanren.org/

The Nanopass Framework is built for that:

"The nanopass framework provides a tool for writing compilers composed of several simple passes that operate over well-defined intermediate languages. The goal of this organization is both to simplify the understanding of each pass, because it is responsible for a single task, and to simplify the addition of new passes anywhere in the compiler."

https://nanopass.org/

https://docs.racket-lang.org/nanopass/index.html