Re: [xmlvm-users] Getting started

[Kühn W. <wo....@en...>]

Hi Damian,

here some issues I found while trying to cross-compile Scala to JavaScript:
* The footprint may be larger as anticipated. For exampe, Console.scala uses DynamicVariable.scala,
   which uses the JRE class InheritableThreadLocal.java.
* The Scala to Java-Byte-Code compiler emits code different from the JDK compiler. For example, Scala
   makes extensive use of method overloading by return type. In Java, the return type is not even part of the
   method signature. Another example is exception handling, where the current Scala compiler generates multi-
   entrant catch blocks. This is not possible in Java either.

However, these issues can be handled, but I would stay clear of the concurrency features of Scale (actors).
Also be aware of extensive method invocations and object creations by Scala programs, which modern JVMs
handle well, but which may not be the case for cross-compiled code.

For more details and some demos, please refer to http://days2010.scala-lang.org/node/138/142

Greetings, Wolfgang

________________________________
Von: Damian [mailto:dam...@gm...]
Gesendet: Samstag, 5. Juni 2010 05:51
An: Panayotis Katsaloulis
Cc: xml...@li...
Betreff: Re: [xmlvm-users] Getting started

Thanks for your reply.
I don't fully understand the problem you expose.
I succeeded cross-compiling the scala library (I wanted to try it anyway) by adding -Xmx1024m option when launching xmlvm.
But the objective c compiler won't compile it anyway, it seems it can't find "java_lang_Cloneable.h". Isn't Cloneable interface supported by xmlvm?
I was thinking that maybe I can try to strip down scala library to a minimum and then write my own library with the functionality I really need around the java library. Though that's exactly what the scala library is, the scala library is a 3.5MB jar that's maybe using too many features unsupported by xmlvm.
Please tell me your thoughts.

Damian.

On Fri, Jun 4, 2010 at 7:16 AM, Panayotis Katsaloulis <pan...@pa...<mailto:pan...@pa...>> wrote:

On 04 Ιουν 2010, at 2:15 ΠΜ, Damian wrote:

>
> 2. My language of choice is Scala by far, and my point is to code
> IPhone apps using Scala. Is that possible? Have anyone tried to get
> xmlvm working with scala?


It is possible.
In theory you should be able to do so with no problems, since I think
this library does not contain any native code (or maybe am wrong).

But  there are a lot of things to consider first, before jumping to
Scala with xmlvm.

First of all, I believe it is totally non-practical to compile the
whole scala-lib. It is huge and contains a lot of things that are not
directly usable, There are methods and tricks to cut down this
overhead, (like a patch I am preparing and will be submitted soon),
but still this is not practical - *right now*.

Second there are things that should be addressed first before simply
compile it with xmlvm, having to do with dependency libraries etc.

Another thing: I strongly believe there is NO reason to create a
compatibility library for Scala, the only thing that needs to be done
is to determine the scala-lib dependencies.
And this is a long talk.


To summarize: I believe xmlvm is not ready for Scala yet, although I
have the same idea as you: I want Scala to be able to be a language of
choice - and not only Scala but every JVM based language.
Right now you have to be patient though and go with the flow :)

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