[GHC] #2593: Wrong size for Int in arguments to functions wrapped to FunPtr by FFI wrappers (on 64-bit machine)

[GHC]

#2593: Wrong size for Int in arguments to functions wrapped to FunPtr by FFI
wrappers (on 64-bit machine)
-------------------------------+--------------------------------------------
    Reporter:  shahn           |       Owner:          
        Type:  bug             |      Status:  new     
    Priority:  normal          |   Component:  Compiler
     Version:  6.8.3           |    Severity:  normal  
    Keywords:                  |    Testcase:          
Architecture:  x86_64 (amd64)  |          Os:  Linux   
-------------------------------+--------------------------------------------
 An operation
 {{{
   foo :: Int -> IO ()
 }}}
 is wrapped to a function pointer {{{ptr :: FunPtr (Int -> IO ())}}} (via
 an FFI wrapper). If you pass this pointer to a C function, that calls it
 with a negative parameter (e.g. -1), the operation is executed with a
 positive parameter (something near
 {{{4294967295 ( == 2 ^ 32 - 1)}}}).

 This works correctly on x86 (32-bit).

 See attachment for an example.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2593>
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