Re: [xmlvm-dev] C backend issues

[Arno P. <ar...@pu...>]

to add to this: there is a little bit of information on the C backend 
and the redlist in the slides: xmlvm/doc/slides

Arno


On 5/19/11 9:45 AM, Sascha Haeberling wrote:
> Hi Domenico,
>
> these are all good questions, no worries. I think we haven't done a
> terrific job in documenting all of this so far. I hope I will find some
> time soon to update out docs on how this works.
>
> Let me give you some background on what the redlist is: We are loading
> resources recursively. For each class C we have a list of dependencies.
> These are classes that are used from within that class C. Unfortunately,
> if we do this even on a simple HelloWorld application, we would end up
> with almost the whole harmony SDK. So what we did it, we created stop
> signs for the recursive loading algorithm and said... this class, don't
> load it, we probably don't need it. This make sense because there are a
> lot of classes that we don't need in a mobile application.
> In a first step we red listed a lot of classes and our approach is to
> take classes of whenever we need them. Sometimes taking of a class from
> the list might require some more work like implementing that class'
> native methods, or removing/chaning other methods.
>
> I am not sure about java.util.TimeZone. It sounds like it could be a bit
> of work to make it work fine. But you can try yourself what happens
> by modifying the redlist.txt. Just remove java.util.TimeZone from it.
> And if other classes are missing, remove those, too. If native methods
> needs to be implemented and you hit them, then you need to implement
> those or find a different way of simplifying the class.
>
> I hope that makes sense.
>
> // Sascha
>
> On Thu, May 19, 2011 at 5:34 PM, Domenico De Fano <dom...@gm...
> <mailto:dom...@gm...>> wrote:
>
>     Hi all,
>
>     I finally decided to make the big jump to the C backend. After a few
>     attempts, I managed to compile my project without errors.
>     In order to do this, I had to write a skeleton for the class
>     UITableViewController. I must say, I found the C backend is
>     painfully unreadable and it took me some
>     time to understand how to manipulate it. I hope however it will get
>     better with time as I get used to it.
>     Now as I try to run the Xcode project, I obtain the following error:
>
>     XMLVM Error: Unsatisfied red class dependency:
>     (java_util_TimeZone___INIT___):(path to the application
>     source)/java_util_TimeZone.m:805
>
>     Does it mean that the class TimeZone needs some other class which is
>     in the red list? Or that it misses that constructor?
>
>     I'm not sure I understood from the slides how to remove classes from
>     the red list. Should I retrieve the class TimeZone from the
>     Harmony distribution and insert it into the src/xmlvm2c/lib/proxies?
>     I also see that there already is a native_java_lang_TimeZone.c class
>     in the
>     src/xmlvm2c/lib/proxies folder; should I use that one and implement
>     the missing method?
>
>     I'm sorry about all the questions, but I don't find the passage from
>     the Objective-C backend really natural.
>
>     Thank your for your attention
>
>
>     --
>     Domenico De Fano
>
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