Re: question about GHC API on GHC plugin

HERMIT has some code for building dictionaries for a given predicate type (by invoking the typechecker functions that do this): https://github.com/ku-fpg/hermit/blob/master/src/HERMIT/Dictionary/GHC.hs#L2... The functions to run TcM computations inside CoreM are here: https://github.com/ku-fpg/hermit/blob/master/src/HERMIT/Monad.hs#L242 and https://github.com/ku-fpg/hermit/blob/master/src/HERMIT/GHC/Typechecker.hs#L... Perhaps that will help get you started? I would like to push these interfaces back into the GHC API at some point, but just haven't done it yet. HTH Andrew On Mon, Aug 17, 2015 at 4:12 PM, Mike Izbicki wrote:

I'm not sure how either of those two functions can help me. The problem is that given an operator (e.g. `+`), I don't know the name of the dictionary that needs to be passed in as the first argument to the operator. I could probably hard code these names, but then the plugin wouldn't be able to work with alternative preludes.

On Fri, Aug 7, 2015 at 11:20 PM, Edward Z. Yang wrote:

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Hello Mike,

Give importDecl from LoadIface a try, or maybe tcLookupGlobal if you're in TcM.

Edward

Excerpts from Mike Izbicki's message of 2015-08-07 15:40:30 -0700:

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I'm trying to write a GHC plugin. The purpose of the plugin is to provide Haskell bindings to Herbie. Herbie (https://github.com/uwplse/herbie) is a program that takes a mathematical statement as input, and gives you a numerically stable formula to compute it as output. The plugin is supposed to automate this process for Haskell programs.

I can convert the core expressions into a format for Herbie just fine. Where I'm having trouble is converting the output from Herbie back into core. Given a string that represents a numeric operator (e.g. "log" or "+"), I can get that converted into a Name that matches the Name of the version of that operator in scope at the location. But in order to create an Expr, I need to convert the Name into a Var. All the functions that I can find for this (e.g. mkGlobalVar) also require the type of the variable. But I can't find a way to figure out the Type given a Name. How can I do this?

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