Re: [Haskell-cafe] Calling Haskell from other languages?
Colin == Colin Paul Adams [EMAIL PROTECTED] writes: Colin And thanks everyone for your help. I have enough to go on Colin now. I followed the example at http://www.haskell.org/haskellwiki/Calling_Haskell_from_C (and renamed the files from A* to fib1*, as I want to pursue this further). But I get: fib1.o: In function `main': fib1.c:(.text+0x0): multiple definition of `main' fib1.o:fib1.c:(.text+0x0): first defined here fib1_stub.o: In function `stginit_export_Safe_zdffibonaccizuhszuaDN': fib1_stub.c:(.text+0x5): undefined reference to `Safe_zdffibonaccizuhszuaDN_closure' fib1_stub.o: In function `fibonacci_hs': fib1_stub.c:(.text+0x32): undefined reference to `Safe_zdffibonaccizuhszuaDN_closure' collect2: ld returned 1 exit status -- Colin Adams Preston Lancashire ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
colin: Colin == Colin Paul Adams [EMAIL PROTECTED] writes: Colin And thanks everyone for your help. I have enough to go on Colin now. I followed the example at http://www.haskell.org/haskellwiki/Calling_Haskell_from_C (and renamed the files from A* to fib1*, as I want to pursue this further). But I get: fib1.o: In function `main': fib1.c:(.text+0x0): multiple definition of `main' fib1.o:fib1.c:(.text+0x0): first defined here fib1_stub.o: In function `stginit_export_Safe_zdffibonaccizuhszuaDN': fib1_stub.c:(.text+0x5): undefined reference to `Safe_zdffibonaccizuhszuaDN_closure' fib1_stub.o: In function `fibonacci_hs': fib1_stub.c:(.text+0x32): undefined reference to `Safe_zdffibonaccizuhszuaDN_closure' collect2: ld returned 1 exit status Not linking in the 'Safe' module on the command line? -- Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
Don == Don Stewart [EMAIL PROTECTED] writes: Don Not linking in the 'Safe' module on the command line? Could be - I don't know any of this stuff. I was just following the instructions on the wiki page. How should these be amended? -- Colin Adams Preston Lancashire ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
Colin == Colin Paul Adams [EMAIL PROTECTED] writes: Don == Don Stewart [EMAIL PROTECTED] writes: Don Not linking in the 'Safe' module on the command line? Colin Could be - I don't know any of this stuff. I was just Colin following the instructions on the wiki page. Got it working now. It seemed to be some case dependency on the file name. -- Colin Adams Preston Lancashire ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
Hi Colin As an alternative you may consider using Thrift: http://incubator.apache.org/thrift/ Cheers, Dave On Tue, 2008-11-11 at 16:45 +, Colin Paul Adams wrote: Is there a way to call Haskell code from other languages? I have looked on the wiki, and as far as I can see, it only talks about the other way round (when Haskell is the main program). ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 On Nov 11, 2008, at 10:45 AM, Colin Paul Adams wrote: Is there a way to call Haskell code from other languages? I have looked on the wiki, and as far as I can see, it only talks about the other way round (when Haskell is the main program). http://www.haskell.org/haskellwiki/GHC/Using_the_FFI#Calling_Haskell_from_C -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkkZuCkACgkQye5hVyvIUKk1pwCfRbVnERADZPygCNX2wjNkdQOC FXMAoKodV1TitVzr5ZJF/AUSmCXuRuKY =BUkK -END PGP SIGNATURE- ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
Quoth Colin Paul Adams [EMAIL PROTECTED]: | Is there a way to call Haskell code from other languages? I have looked on | the wiki, and as far as I can see, it only talks about the other way | round (when Haskell is the main program). There sure is a way to call from other languages - cf. foreign export - but don't know how hard it would be to make Haskell live without its main, which performs a lot of runtime initialization. For me (with nhc98) it's a lot easier to use a Haskell main that's just a brief wrapper: module Main (main) where import NHC.FFI foreign import ccall cmain cmain :: IO () main = cmain (... where cmain is an external entry point in the C code, which can then call Haskell as required.) Donn ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
On Tue, 2008-11-11 at 17:09 +, Colin Paul Adams wrote: Jake == Jake Mcarthur [EMAIL PROTECTED] writes: Jake Actually, that's not the whole story. I didn't realize until Jake I sent it. There does exist good documentation for this, I Jake promise. Good. Let me know where it is when you track it down. The link you pointed me too doesn't seem to address my question directly. Also, it only talks about C. If I want to call Haskell (and I do, perhaps) from another garbage-collected language (Eiffel, in particular) using C as the mutually understood language, am I not going to run into big problems? Read the FFI Report. It is relatively readable and comprehensive. http://www.cse.unsw.edu.au/~chak/haskell/ffi/ And yes, you will have to use C as an intermediary, though you may not have to actually write any C. You simply expose the Haskell functions in whatever form the other language expects. You'll almost certainly have to write marshalling code of some sort. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
On Tue, Nov 11, 2008 at 12:35:05PM -0600, Derek Elkins wrote: On Tue, 2008-11-11 at 17:09 +, Colin Paul Adams wrote: Jake == Jake Mcarthur [EMAIL PROTECTED] writes: Jake Actually, that's not the whole story. I didn't realize until Jake I sent it. There does exist good documentation for this, I Jake promise. Good. Let me know where it is when you track it down. The link you pointed me too doesn't seem to address my question directly. Also, it only talks about C. If I want to call Haskell (and I do, perhaps) from another garbage-collected language (Eiffel, in particular) using C as the mutually understood language, am I not going to run into big problems? Read the FFI Report. It is relatively readable and comprehensive. http://www.cse.unsw.edu.au/~chak/haskell/ffi/ And yes, you will have to use C as an intermediary, though you may not have to actually write any C. You simply expose the Haskell functions in whatever form the other language expects. You'll almost certainly have to write marshalling code of some sort. I often like to look at these situations as an opportunity to introduce modularity and piping. Do you really need them running in the same address space? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
colin: Is there a way to call Haskell code from other languages? I have looked on the wiki, and as far as I can see, it only talks about the other way round (when Haskell is the main program). http://haskell.org/haskellwiki/Calling_Haskell_from_C Cheers, Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
colin: Jake == Jake Mcarthur [EMAIL PROTECTED] writes: Jake Actually, that's not the whole story. I didn't realize until Jake I sent it. There does exist good documentation for this, I Jake promise. Good. Let me know where it is when you track it down. The link you pointed me too doesn't seem to address my question directly. Also, it only talks about C. If I want to call Haskell (and I do, perhaps) from another garbage-collected language (Eiffel, in particular) using C as the mutually understood language, am I not going to run into big problems? No, you can manage objects via e.g. ForeignPtr's. The community has a whole has done bridges between Haskell and pretty much anything you care to name, via the C FFI. Just depends on how well you understand the memory management models of both players. -- Don ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
John == John Goerzen [EMAIL PROTECTED] writes: Read the FFI Report. It is relatively readable and comprehensive. http://www.cse.unsw.edu.au/~chak/haskell/ffi/ And yes, you will have to use C as an intermediary, though you may not have to actually write any C. You simply expose the Haskell functions in whatever form the other language expects. You'll almost certainly have to write marshalling code of some sort. John I often like to look at these situations as an opportunity John to introduce modularity and piping. Do you really need them John running in the same address space? Good point. And thanks everyone for your help. I have enough to go on now. -- Colin Adams Preston Lancashire ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
Jake == Jake Mcarthur [EMAIL PROTECTED] writes: Jake Actually, that's not the whole story. I didn't realize until Jake I sent it. There does exist good documentation for this, I Jake promise. Good. Let me know where it is when you track it down. The link you pointed me too doesn't seem to address my question directly. Also, it only talks about C. If I want to call Haskell (and I do, perhaps) from another garbage-collected language (Eiffel, in particular) using C as the mutually understood language, am I not going to run into big problems? -- Colin Adams Preston Lancashire ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Actually, that's not the whole story. I didn't realize until I sent it. There does exist good documentation for this, I promise. - - Jake -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.8 (Darwin) iEYEARECAAYFAkkZuHoACgkQye5hVyvIUKnGeACfZN+9nNy+nGvQHDsG1FrI4Puu Zw0AmgKK0WOYTjWWeQX93rrnSJApG0pa =Vazy -END PGP SIGNATURE- ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Calling Haskell from other languages?
I had a proof of concept lying around a couple of years ago in which a big complicated Ada program called a big complicated Haskell program and vice versa. The tricky bit from memory was making it link, and satisfying their rumtime initialisation requirements. No explicit C was required I think. Fraser On 11 nov 2008, at 18:09, Colin Paul Adams [EMAIL PROTECTED] wrote: Jake == Jake Mcarthur [EMAIL PROTECTED] writes: Jake Actually, that's not the whole story. I didn't realize until Jake I sent it. There does exist good documentation for this, I Jake promise. Good. Let me know where it is when you track it down. The link you pointed me too doesn't seem to address my question directly. Also, it only talks about C. If I want to call Haskell (and I do, perhaps) from another garbage-collected language (Eiffel, in particular) using C as the mutually understood language, am I not going to run into big problems? -- Colin Adams Preston Lancashire ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
