使用GHC的API或提示从已编译的二进制文件导入已知函数

Target.hs

Target.accessMe

Target

import GHC
import DynFlags

compile :: String -> IO SuccessFlag
compile name = defaultRunGhc $ do
  dynflags <- getSessionDynFlags
  let dynflags' = dynflags -- You can change various options here.
  setSessionDynFlags dynflags'

  -- (name) can be "Target.hs", "Target", etc.
  target <- guessTarget name Nothing
  addTarget target
  load LoadAllTargets -- Runs something like "ghc --make".

defaultRunGhc

import GHC.Paths (libdir)

defaultRunGhc :: Ghc a -> IO a
defaultRunGhc = defaultErrorHandler defaultDynFlags . runGhc (Just libdir)

import Unsafe.Coerce (unsafeCoerce)

fetch :: String -> String -> IO Int -- Assumes we are fetching an Int value.
fetch name value = defaultRunGhc $ do
  -- Again, you can change various options in dynflags here, as above.
  dynflags <- getSessionDynFlags
  let m = mkModule (thisPackage dynflags) (mkModuleName name)
  setContext [] [(m, Nothing)] -- Use setContext [] [m] for GHC<7.

  fetched <- compileExpr (name ++ "." ++ value) -- Fetching "Target.accessMe".
  return (unsafeCoerce fetched :: Int)

plugins