Re: [xmlvm-dev] C backend issues

[Sascha H. <sa...@gm...>]

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...>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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