[Haskell-cafe] plugins and internal error: stg_ap_v_ret

[Andy Stewart]

Michael Snoyman <michael at snoyman.com> writes:

> Thanks for the link Andy, this definitely looks like the right I will
> ultimately need to take. 
Good, here is framework link to help you understand Dynload.hs 

http://www.flickr.com/photos/48809572@N02/5304662424/sizes/l/

Manatee is huge, but Dynload.hs is pretty simple, you can copy
Dynload.hs to your project for your need, the code under GPL-3.

Cheers,

  -- Andy

> 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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