iburg is most often used as a code-generator generator. From the web page:
iburg is a program that generates fast tree parsers for cost-augmented tree grammars. iburg is useful for writing code generators and for teaching computer science compiler courses.
From Christian Lindig and the C–– group comes OCamlBurg, which is an implementation of a Burg-like code-generator-generator that produces OCaml code.
Zephyr Compiler Infrastructure provides a means to define an intermediate representation and write passes on it in several languages; it also provides a hardware description language to power a code-generator generator. From the web site:
If you describe your intermediate forms using Zephyr’s Abstract Syntax Description Language (ASDL), we can generate data-structure definitions in C, C++, Java, Standard ML, and Haskell. Your IR can be serialized on disk and freely exchanged among compiler passes written in these languages…
[Zephyr] generate[s] the machine-dependent parts from descriptions of instructions’ semantics, of binary representations, or of other properties. Zephyr’s Computer Systems Description Languages (CSDL) let you describe as much or as little as you need for your application.
Zephyr also seems to provide a reasonable set of built-in optimizations.
