[haskell-llvm] Limitation of API - omissions or design?

[Henning Thielemann]

Maciej Piechotka wrote:
> On Thu, 2010-12-16 at 14:23 +0100, Henning Thielemann wrote:
>> On Thu, 16 Dec 2010, Maciej Piechotka wrote:
>>
>>> I use this technique often. Well the code is secure but I have things
>>> like infinite space of values of infinite space of functions.
>> What do you mean with 'space'? According to LLVM doc open arrays shall be 
>> implemented using arrays of size zero while relying on LLVM not to do any 
>> boundary checks.
>>
> 
> I mean tree. Something like (simplified and for functions operating only
> on ints):
> 
> data SymbolSpace a = SymbolSpace (a TypeNum) (SymbolSpace a TypeNum)

I am wondering why SymbolSpace has one parameter 'a' on the left hand 
side, two arguments on the right side - 'a' and 'TypeNum'.

I see, you need recursive types. They are handled in a special way in LLVM:
   http://llvm.org/docs/LangRef.html#t_uprefs
I remember that they are not supported in Haskell-llvm wrapper and I 
helped myself with a void pointer that (in your case) I have to cast to 
a (Ptr SymbolSpace).

It's an interesting challenge to model this in Haskell.