dynamic loading with ghc api?

[Don Stewart]

Perhaps look at the plugins package source?

-- Don

On Thu, Apr 7, 2011 at 12:20 PM, Rob Nikander <rob.nikander at gmail.com> wrote:
> Hi all,
>
> I'd like to load a value from a .o file.  I've got...
>
> import ObjLink
> main = do
>  initObjLinker
>  loadObj "Thing.o"
>  resolveObjs
>  Just ptr <- lookupSymbol "Thing_value_closure"
>
> Is that the correct symbol to load for the name "value" in module
> "Thing"?  And if so, how to I get the haskell value out of the Ptr
> that I get from lookupSymbol?  I found some code to do it and it works
> value :: Int, but it seg faults if value :: Integer, or something more
> complex like a function.
>
> {-# LANGUAGE MagicHash #-}
> {-# LANGUAGE UnboxedTuples #-}
> ...
> let !(Ptr addr) = ptr
> in case addrToHValue# addr of
>    (# hval #) -> hval
>
> Is there some documentation for this that I'm missing?  I'm looking at
> haddock with just type signatures, like this:
>
> http://www.haskell.org/ghc/docs/7.0.3/html/libraries/ghc-7.0.3/ObjLink.html
>
> (I'm a haskell beginner.)
>
> thank you,
> Rob
>
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