#7506: adding extra arguments to a foreign import statement can cause ghc to
panic
-------------------------------+--------------------------------------------
Reporter: jwlato | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (FFI)
Version: 7.6.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: Compile-time crash | Blockedby:
Blocking: | Related:
-------------------------------+--------------------------------------------
When defining a "FunPtr" of a C import, adding extra arguments outside the
"FunPtr" causes ghc to panic.
{{{
{-# LANGUAGE ForeignFunctionInterface #-}
module Foo where
import Foreign.Ptr
foreign import ccall "stdio.h &putchar" c_putchar :: () -> FunPtr (Char ->
IO ())
}}}
compiling results in
{{{
[1 of 1] Compiling Foo ( foo.hs, foo.o )
ghc: panic! (the 'impossible' happened)
(GHC version 7.6.1.20121207 for x86_64-unknown-linux):
resultWrapper
ghc-prim:GHC.Tuple.(){(w) tc 40}
-> base:GHC.Ptr.FunPtr{tc 33D}
(ghc-prim:GHC.Types.Char{(w) tc 3o}
-> ghc-prim:GHC.Types.IO{tc 32I} ghc-prim:GHC.Tuple.(){(w) tc
40})
}}}
Ideally, a solution to this would allow for partially applying a value
that would be accessed within the FunPtr, although that's probably not
trivial to support.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7506>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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