Re: [xmlvm-users] C Backend

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

just to add a few things from my side:


On 5/18/11 7:22 AM, Kevin Glass wrote:
> So, I've been working away on my little games using the Objective-C
> backend. I'm quite comfortable fiddling around with it and the
> objc-comatlib. However, I'd like to keep up to date, so I'd like to move
> to the posix backend. I have a few questions:
>
> - Do I still write against the Objective C compatibility libraries, I
> can't find any Java classes in the xml2c compatibility library?

As Markus pointed out, we still use the same Cocoa Java classes in 
xmlvm/src/xmlvm2objc/compat-lib/java. They should (and eventually will) 
be moved to a different directory since their implementation is not 
dependent on the kind of backend.

> - Will I get a performance increase in moving? I seem to remember you
> were going from a stack based to a register based implementation for posix.

In general, I believe so. We do some funky optimizations such as 
selector coloring and vtable reductions.

> - How do I switch over, is it just a matter of changing the target or is
> the output completely different?

For iOS projects: --target=iphonec
For Android projects: --target=iphonecandroid

> - Does it still output an xcode project - which I mangle :)

Yes, same as before.

> - Are there missing bits from the posix backend that I'll need? (OpenGL,
> Sound Calls, Network, Resource access, Input).

There are still quite a few wrapper missing. However, those can usually 
be easily adopted from the Objective-C backend. In other cases, the C 
backend outpasses the Objective-C backend (e.g., full support of the 
standard J2SE API by the C backend)

Arno