[Haskell-cafe] Getting segmentation fault when profiling, despite `-K100M'.

[Niklas Larsson]

If you want to call a Haskell function from C you should do a "foreign
export" of the function, that will create a stub function with C
calling convention that you can call.

Regards,
Niklas

2011/8/16 David Banas <dbanas at banasfamily.net>:
> Hi all,
>
> I'm trying to profile a mixed language program, in which Haskell is NOT
> the top layer and does not contain the `main' function. (C is/does.)
>
> Is this effort doomed to fail?
>
> I'm getting a segmentation fault, as soon as the first Haskell function
> is called, despite having included `-K100M' in my list of +RTS args:
>
>  19     int argc = 5;
>  20     char* argv[] = {"ghcDll",
>  21                     "+RTS",
>  22                     "-hc",
>  23                     "-p",
>  24                     "-K100M",
>  25                     NULL}; // argv must end with NULL
>  26
>  27     // Initialize Haskell runtime
>  28     char** args = argv;
>  29     hs_init(&argc, &args);
>
> Using gdb to trace through the C-code, up until the first call to
> Haskell, I get to here:
>
>  64     // Call the Haskell function.
>  65     res = amiInit(
>  66         impulse_matrix,
>  67         row_size,
>
> Here's the beginning of `amiInit':
>
>  41 -- Our Haskell implementation of `AMI_Init'.
>  42 amiInit :: Ptr CDouble -> CInt -> CInt -> CDouble -> CDouble ->
>  43            CString -> Ptr CString -> Ptr (StablePtr AmiModel) -> Ptr
> CString -> IO Int
>  44 amiInit impulse_matrix row_size aggressors sample_interval bit_time
>  45         ami_parameters_in ami_parameters_out ami_memory_handle
> msgHndl
>  46     | impulse_matrix == nullPtr = return 0
>  47     | otherwise = do
>  48         putStrLn "I'm here."
>
> I never see "I'm here." printed to my console, before I get the
> segmentation fault.
>
> Any thoughts?
>
> Thanks,
> -db
>
>
>
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