Hi all.
JP Moresmau писал 20.11.2012 13:01:
You may want to have a look at my little HJVM project on Github (
https://github.com/JPMoresmau/HJVM). Promise, I'll put in on Hackage
some
day. Basically it provides FFI wrappers and some c code to be able to
start
a JVM and call Java methods, etc from Haskell.
Please take a look at http://hackage.haskell.org/package/hs-java also.
It's an assembler/disassembler of Java bytecode and *.class files.
Moreover, there is https://github.com/MateVM/MateVM — an (experimental)
Java VM on Haskell :) So, if you are interested in haskell/java interop,
maybe we could integrate our efforts.
Best regards,
Ilya Portnov.
--
JP Moresmau
http://jpmoresmau.blogspot.com/
On Tue, Nov 20, 2012 at 7:53 AM, Mathijs Kwik
<[email protected]>wrote:
KC <[email protected]> writes:
> Instead of Haskell running on the JVM is there a way for Haskell
to
> call a JVM language (or generate bytecode) to access the Java
class
> libraries when needed?
I once did a small test to get this working.
It's not that hard, but needs some work. It's fine for exposing a
few
functions though.
Basically it's a 2-step process, eased by using a makefile or
similar
helper.
You have to compile your haskell code into a shared object (.so on
linux, .dll on windows), which includes the haskell runtime (rts).
This library can be called from c.
A small pitfall is that you first need to do a call to initialize
the
haskell runtime, and when you're done using it, close it.
This is most easily just tied to your c/java program's main
initialization functions.
Java is able to load/use these shared libraries through JNI.
Of course you lose your platform-independance, so if you want your
java
application to work on multiple platforms / OSses, you need to build
shared objects for all of them.
Last but not least:
You have to export the haskell functions you want through FFI.
Also, make sure they use raw data types such as CString, as that
what C
and java will give you and expect back.
So basically you go Haskell FFI <-> C <-> Java JNI
I'm sorry I cannot give you any links or code, because I'm in a bit
of a
hurry. But google and the ghc docs are your friend.
Mathijs
>
> Or
>
> Is there a way for a JVM language or bytecode to call Haskell when
needed?
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