Re: [xmlvm-dev] C backend and library

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

Ah now I see, thanks for the explanation. I am curious to what Arno has to
say about this, as I am not in this matter too deeply. However, I know that
we are doing several optimizations on the files in the C-backend when we
know that a certain set of classes doesn't exist.

One functionality we have right now is introducing special error methods
that stop the execution of the program, if a "red class" is hit. This makes
sense for classes we are not sure actually work at all for example.

Also I wonder if the linking process would then not take a lot of time and
if the time speed-up would then be really that much.

Just thinking out loud ... I let Arno comment on it, who knows much better
to evaluate the situation.

// Sascha

2011/6/10 Panayotis Katsaloulis <pan...@pa...>

>
> On 10 Ιουν 2011, at 3:11 μ.μ., Sascha Haeberling wrote:
>
> > Panayotis,
> >
> > sorry, I didn't understand what you mean. What do you mean by "the
> library"? The C backend does compute all dependencies so that the number of
> classes that are compiled and outputted in the end is at a minimum. Only
> required classes will be pulled in. Why would you want to replace this and
> with what?
> >
> > // Sascha
>
>
> This is from an old discussion.
>
> The idea is to compile the whole JDK and iPhone compatibility library (and
> probably other dependencies) into a C library (i.e. in a form of .a file)
> and compile the project against this library.
> Thus the Xcode project will compile much much faster and even the
> production of the Xcode project will be faster (and smaller) since no files
> from the JDK and the compatibility library will be required any more.
>
> This idea was also in the earlier days of ObjC backend, but due to the way
> ObjC handled dependencies and late binding, the gain was far less.
> Now with the strong typed C language, things should be much better.
>
> For example, if a function is not used at all, the C compiler understands
> that and never embeds it into the output binary - we have optimizations in
> the method-level, instead of the class-level.
>
>
> I don't know how virtual functions are handled and probably Arno could help
> with this.
>
>
> PS: I remember that ProGuard is also able to perform this type of
> optimizations and it is already used for this reason in Android projects.
> Probably we should also do something similar?
>
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