Terra: Low-level system programming language meta-programmed from Lua

• terra

  38 2,669 5.1 C++

  Terra is a low-level system programming language that is embedded in and meta-programmed by the Lua programming language.

  

Please note: The entire "windows" portion of that article has largely been resolved at this point, because I fixed it myself. Some of the more egregious documentation problems have been fixed, but others remain unresolved.

Unfortunately, we have since discovered even more insane behavior: https://github.com/terralang/terra/issues/460

• legion

  11 647 9.9 C++

  The Legion Parallel Programming System (by StanfordLegion)

  

Note that I changed the variable name to clarify that only the lexical scope matters (i.e., "x" is a symbol passed to the function as argument y).

You should be able to create towers of languages in Terra. I'm not sure if anyone really does more than 2 levels in practice, but most of the common Terra DSLs are basically written as code generators on top of Terra language expressions.

See e.g. the Regent code generator. Here's an example of some nested metaprogramming---not with a nested language or macros, but with an escape that calls a Lua function to generate more code based on the type of the argument:

https://github.com/StanfordLegion/legion/blob/0cf9ddd60c227c...

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