---------- Forwarded message ----------
From: Vivian McPhail <[email protected]>
Date: 22 June 2011 17:17
Subject: #4459: Loading Names and Types via GHC
To: [email protected]
Hi,
I can successfully set up GHC and compile a module, say 'X.hs'.
<quote>
dynload :: Symbol -> ModuleName -> DynType (Either [String] DynamicHValue)
dynload sym m = do
liftGhc $ GHC.setTargets [GHC.Target (GHC.TargetModule m) True Nothing]
res <- liftGhc $ GHC.load GHC.LoadAllTargets
case res of
GHC.Failed -> return $
Left ["failed to load module: "++(moduleNameString m)]
GHC.Succeeded -> do
</quote>
I'm failing to load the symbol, with a "not in scope" error:
<quote>
nms <- liftGhc $ GHC.parseName sym
case nms of
[] -> return $ Left ["could not find name: <<"
++sym++">>"]
(n:_) -> do
</quote>
I am attempting to then load the `HValue` and `Type` of a given variable:
<quote>
mod <- liftGhc $ GHC.findModule m Nothing
Just mod_info <- liftGhc $ GHC.getModuleInfo mod
Just ty <- liftGhc $ GHC.modInfoLookupName mod_info
n
hval <- withSession $ \hsc_env ->
liftIO $ getHValue hsc_env n
return $ Right (DynamicHValue ty hval)
</quote>
However, I am not sure how to create a `Name` from a String that is the
variable name. How do I do that? I can get a list of names, but I get an
error "Not in scope: `<var_name>`
Also, what is the difference between a `Type` and a `TyThing` and which
should I be using?
Vivian
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