I can confirm that non-primitive/abstract types are not meant to cross
the FFI boundary.
On 05/21/2017 11:31 PM, Aistis Raulinaitis wrote:
Thanks!
On Sun, May 21, 2017 at 8:27 PM, Artyom Shalkhakov
<[email protected] <mailto:[email protected]>> wrote:
2017-05-22 9:19 GMT+06:00 Aistis Raulinaitis
<[email protected] <mailto:[email protected]>>:
> Hmm, that makes sense. Do you have an example of FFI with an
abstract type?
> I tried to encapsulate the map type with a con, but obviously
that does not
> work..
>
Sure, here are two examples:
https://github.com/bbarenblat/urweb-regex
<https://github.com/bbarenblat/urweb-regex> (in particular, take a
look
at regex__FFI.urs and the two types [substring_t] and
[substring_list_t])
https://github.com/ashalkhakov/urweb-storage
<https://github.com/ashalkhakov/urweb-storage> (shameless plug; in
particular, take a look at storage__FFI.urs and the type [storage])
> On Sun, May 21, 2017 at 8:10 PM, Artyom Shalkhakov
> <[email protected]
<mailto:[email protected]>> wrote:
>>
>> 2017-05-22 6:22 GMT+06:00 Aistis Raulinaitis
<[email protected] <mailto:[email protected]>>:
>> > So I am working with the JS FFI, however it seems that the
clientOnly
>> > directive is being ignored.
>> >
>> > Here is the example code:
>> >
>> > ~~~
>> > main.urp:
>> > ~~~
>> >
>> > ffi js_map
>> > jsFunc Js_map.new_map=new_map
>> > jsFunc Js_map.new_map_with=new_map_with
>> > clientOnly Js_map.new_map
>> > clientOnly Js_map.new_map_with
>> > benignEffectful Js_map.new_map
>> > benignEffectful Js_map.new_map_with
>> > jsFile js_map.js
>> >
>> > main
>> >
>> >
>> > ~~~
>> > main.urs:
>> > ~~~
>> >
>> > val main : unit -> transaction page
>> >
>> >
>> > ~~~
>> > main.ur:
>> > ~~~
>> >
>> > fun main () =
>> > c <- Js_map.new_map_with ((1, 2)::[]);
>> > return <xml></xml>
>> >
>> >
>> > ~~~
>> > js_map.urs:
>> > ~~~
>> >
>> > con js_map :: Type -> Type -> Type
>> >
>> > val new_map : k ::: Type -> v ::: Type -> unit ->
transaction
>> > (js_map k
>> > v)
>> > val new_map_with : k ::: Type -> v ::: Type -> list (k * v) ->
>> > transaction
>> > (js_map k v)
>> >
>> >
>> > ~~~
>> > js_map.js:
>> > ~~~
>> >
>> > function new_map () {return new Map ();}
>> >
>> > function new_map_with (arg) {return new Map (arg); }
>> >
>> >
>> > ~~~
>> > So in main.ur, you can see that I am calling this Js code in a C
>> > context,
>> > instead of getting an error complaining about how it should
be called on
>> > the
>> > client, instead I get this confusing error:
>> >
>> > urweb main
>> > /Users/ace/src/cli_only/js_map.urs:4:75: (to 4:87)
Unsupported type
>> > constructor
>> > Constructor: FFI(Js_map.js_map_with) FFI(Basis.int)
FFI(Basis.int)
>> >
/usr/local/Cellar/urweb/20170105/lib/urweb/ur/basis.urs:127:23: (to
>> > 127:25)
>> > Unsupported type constructor
>> > Constructor: FFI(Js_map.js_map_with) FFI(Basis.int)
FFI(Basis.int)
>> > make: *** [all] Error 1
>> >
>>
>> I got the impression that Ur/Web being a whole-program optimizing
>> compiler, the only types being supported for marshalling
between FFI
>> code and non-FFI code are primitive types and abstract types. I
think
>> I asked this same question some time ago.
>>
>> So it looks like you will have to work around this somehow.
>>
>> >
>> >
>> > _______________________________________________
>> > Ur mailing list
>> > [email protected] <mailto:[email protected]>
>> > http://www.impredicative.com/cgi-bin/mailman/listinfo/ur
<http://www.impredicative.com/cgi-bin/mailman/listinfo/ur>
>> >
>>
>>
>>
>> --
>> Cheers,
>> Artyom Shalkhakov
>>
>> _______________________________________________
>> Ur mailing list
>> [email protected] <mailto:[email protected]>
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<http://www.impredicative.com/cgi-bin/mailman/listinfo/ur>
>
>
>
> _______________________________________________
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>
--
Cheers,
Artyom Shalkhakov
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