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Re: Cross-platform toolkit with a Cocoa backend
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Re: Cross-platform toolkit with a Cocoa backend


  • Subject: Re: Cross-platform toolkit with a Cocoa backend
  • From: Uli Kusterer <email@hidden>
  • Date: Thu, 12 Jul 2007 12:42:33 +0200

On 12.07.2007, at 10:49, Felipe Monteiro de Carvalho wrote:
On 7/11/07, Ofri Wolfus <email@hidden> wrote:
After all, ObjC can be implemented purely in a
preprocessor, and you can do by hand what the preprocessor would do
for you.

Do you know of where one can download such preprocessor? (In the hipotesys that it exists)

I was looking for examples about how to transform objective-c code
into calls to the rtl, and this would be excelent =)

Shouldn't be too hard. In the header that contains objc_msgSend(), there's lots of comments and also other functions that let you create or look up selectors etc., and there's also docs for that in Xcode's documentation viewer. I've used objc_msgSend() in a little compiler thingie I was working on, and it's really just a function call. The only thing I haven't yet tried is subclass a class. But for that, you could probably have a peek at the runtime data structures (also in that header) and the source code for method swizzling that's out on the web (which uses them to add a method, and is linked from the http://cocoadev.com Wiki).


Between those and a bit of stubborn trial-and-error, you should be able to work it out fairly easily. Of course, if you know assembly, you could also just go and use GCC's -S option to compile an ObjC program into an assembly source file and use that to see what ObjC does.

Cheers,
-- M. Uli Kusterer
http://www.zathras.de



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  • Follow-Ups:
    • Re: Cross-platform toolkit with a Cocoa backend
      • From: Sherm Pendley <email@hidden>
References: 
 >Cross-platform toolkit with a Cocoa backend (From: "Felipe Monteiro de Carvalho" <email@hidden>)
 >Re: Cross-platform toolkit with a Cocoa backend (From: j o a r <email@hidden>)
 >Re: Cross-platform toolkit with a Cocoa backend (From: "Felipe Monteiro de Carvalho" <email@hidden>)
 >Re: Cross-platform toolkit with a Cocoa backend (From: "Dr. Rolf Jansen" <email@hidden>)
 >Re: Cross-platform toolkit with a Cocoa backend (From: Sherm Pendley <email@hidden>)
 >Re: Cross-platform toolkit with a Cocoa backend (From: Ofri Wolfus <email@hidden>)
 >Re: Cross-platform toolkit with a Cocoa backend (From: "Felipe Monteiro de Carvalho" <email@hidden>)

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