Debugging Haskell: the stack
Christoph Lueth
cxl@Informatik.Uni-Bremen.DE
Fri, 25 Oct 2002 14:54:56 +0200
Dear Haskell people,
when I call from Haskell into C, stop it there, and use a debugger (e.g
gdb) to look at the stack, it looks all broken. Here is an example:
#0 c_init () at c.c:5
#1 0x08048f14 in ssM_fast1 ()
#2 0x0804a248 in sakt_ret ()
#3 0x04c58308 in ?? ()
(c_init is a C function on which I've set a breakpoint). Now, I don't
expect to see meaningful stack frames from Haskell, but I am calling
into Haskell from C, and I would expect the C functions calling into
Haskell to appear on the stack frame. What is happening? How does
Haskell manage to still return to C when the stack looks like that?
Best regards,
--C.