Thanks for your help. Replying inline
On Sun, Dec 5, 2010 at 1:28 PM, Henning Thielemann
On Sun, 5 Dec 2010, Lally Singh wrote:
Hey all, I'm trying to get started generating LLVM code, but I'm getting a rather cryptic error.
Btw. there is haskell-llvm@projects.haskell.org
buildReaderFun :: String -> CodeGenModule (Function (IO ())) buildReaderFun nm = do puts <- newNamedFunction ExternalLinkage "puts" :: TFunction (Ptr Word8 -> IO Word32) greetz <- createStringNul nm func <- createFunction ExternalLinkage $ do tmp <- getElementPtr0 greetz (0 :: Word32, ())
You have to add a type annotation to greetz like (greetz :: Array D42 Word8) which limits your string to a length of 42 bytes.
If you do not know the length, better use withStringNul. I implemented the current behavior, because the former implementation was unsafe.
I'm sorry, the type signature for withStringNul is over my head. withStringNul :: String -> (forall n. (Nat n) => Global (Array n Word8) -> CodeGenModule a) -> CodeGenModule a On the LLVM side, I'm looking to simply create a string constant I can pass in, such as ConstantArray::get(..). I *think* withStringNul will generate code to build a runtime-length determined string? Sorry, I'm a little thick.
call puts tmp -- Throw away return value. ret () return func
My attempts at figuring out what type-level has to do with this, and how to satisfy it have so far proven unsuccessful.
type-level provides type level integers, and thus allows for static checking of sizes, such as the number of bits of an integer type.
Thanks -- sorry -- I'm guessing it's to make sure we're generating valid code? Cheers, -Lally