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stepcut / plugins

Dynamic linking and runtime evaluation of Haskell, and C, including dependency chasing and package resolution.
GNU Lesser General Public License v2.1
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Try to get this package working again. #9

Closed galenhuntington closed 5 years ago

galenhuntington commented 5 years ago

Work for #8.

I do not understand the inner workings of this package at all, but I was able to fix the problems preventing it from building. The config.h issue was pretty simple: the working directory Cabal was building from changed (we may need CPP to support older versions). A few other tweaks were needed. With these changes, it kind of works.

I also looked at some forks, and found the changes at https://github.com/abarbu/plugins/commit/5094eb02c25eda0cc228d6bacdbedbddcd116311 by @abarbu, which I tried to integrate into the current version. I do not fully understand them, but they seem to help finding modules for the "load" operation.

Current status based on my limited testing:

  1. The "eval" operation seg-faults if you run your code interpreted, or compiled with -dynamic. I tried to figure this out but got nowhere. However, if compiled (statically), it seems to work.

  2. Running load from interpreted code takes about 1-2 seconds. Running it from compiled code takes about 8-9 seconds. I have found compiling with -dynamic recovers the faster behavior. Again, I don't know how this stuff works, so have no explanation or solution.

  3. I haven't worked on any of the Stack, Travis, or deprecation issues, nor tested against versions of GHC other than 8.6.4.

So this is at least a first step. If we put our heads together, perhaps we can bring this package back from the dead.