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

Reading a bit closer I assume you have already done that. Sorry for that. Regards, Niklas 2011/8/16 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 :

...

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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