Using plugins with dynamic Haskell objects hasn't been tested in quite a while. -- Don On Thu, Apr 7, 2011 at 5:14 PM, Rob Nikander wrote:

Is the 'plugins' package compatible with dynamic linking of the main program?   I ask because I wrote a test program using System.Plugins.load and it works fine, but when I link it to the GHC api using `ghc -dynamic ...' (which is nice cause it avoids the 50 MB executable),  it seg faults when it tries to call the function that it loaded from the .o file.  Maybe I need to compile the .o with something more than `ghc -c MyPlugin.hs'?

Rob

On Thu, Apr 7, 2011 at 3:35 PM, Don Stewart wrote:

...

Perhaps look at the plugins package source?

-- Don

On Thu, Apr 7, 2011 at 12:20 PM, Rob Nikander 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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