[Haskell-cafe] plugins and internal error: stg_ap_v_ret

[Michael Snoyman]

Thanks for the link Andy, this definitely looks like the right I will
ultimately need to take. I just found out that plugins does not
install very well on Windows, which is something I need to provide
good support for with wai-handler-devel.

Michael

On Tue, Feb 1, 2011 at 1:15 PM, Andy Stewart <lazycat.manatee at gmail.com> wrote:
> Hi Michael,
>
> I have write some dynamic-loading code for my Manatee project
> (http://hackage.haskell.org/package/manatee)
>
> Dynload.hs use GHC API, if you interested it, you can read source code:
>
> https://patch-tag.com/r/AndyStewart/manatee-core/snapshot/current/content/pretty/Manatee/Core/Dynload.hs
>
> Cheers,
>
>  -- Andy
>
> Michael Snoyman <michael at snoyman.com> writes:
>
>> Hi Andy,
>>
>> plugins *is* working in general for me for some trivial test cases.
>> It's specifically this use case with WAI that's causing trouble, which
>> implies to me I'm misusing the API somehow.
>>
>> Michael
>>
>> On Tue, Feb 1, 2011 at 4:22 AM, Andy Stewart <lazycat.manatee at gmail.com> wrote:
>>> Hi Michael,
>>>
>>> plugins use it's own function instead GHC API, so it's easy to break
>>> with new version GHC.
>>>
>>>  -- Andy
>>>
>>> Michael Snoyman <michael at snoyman.com>
>>> writes:
>>>
>>>> Hi all,
>>>>
>>>> I'm trying to convert wai-handler-devel to use plugins instead of
>>>> hint, but cannot even get some basic usages to work properly. I've put
>>>> together a minimal example that loads a WAI application from a
>>>> separate file and runs it, but this immediately causes the program to
>>>> crash saying:
>>>>
>>>> loader: internal error: stg_ap_v_ret
>>>>     (GHC version 6.12.3 for i386_unknown_linux)
>>>>     Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
>>>>
>>>> Is this an actual bug in GHC, or am I misusing the plugins package?
>>>>
>>>> The two source files:
>>>>
>>>> MyModule.hs
>>>> {-# LANGUAGE OverloadedStrings #-}
>>>> module MyModule where
>>>>
>>>> import Network.Wai
>>>> import Data.ByteString.Lazy.Char8 ()
>>>>
>>>> myapp _ = responseLBS status200 [("Content-Type", "text/plain")] "myapp"
>>>>
>>>> loader.hs
>>>> import System.Plugins.Make
>>>> import System.Plugins.Load
>>>> import Network.Wai.Handler.Warp (run)
>>>>
>>>> main :: IO ()
>>>> main = do
>>>>     MakeSuccess _ obj <- makeAll "MyModule.hs" []
>>>>     LoadSuccess _ app <- load_ obj [] "myapp"
>>>>     run 3000 app
>>>>
>>>> Thanks,
>>>> Michael
>>>
>>>
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