linux-kernel - Re: Kernel Development & Objective-C

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Date:	Sun, 02 Dec 2007 20:23:12 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	David Newall <david@...idnewall.com>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	Xavier Bestel <xavier.bestel@...e.fr>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Ben.Crowhurst@...llatravel.co.uk, linux-kernel@...r.kernel.org
Subject: Re: Kernel Development & Objective-C

Alan Cox wrote:
>> Well, original C allowed you to do what you wanted with pointers (I used 
>> to teach that back when K&R was "the" C manual). Now people which about 
>> having pointers outside the array, which is a crock in practice, as long 
>> as you don't actually /use/ an out of range value.
>>     
>
> Actually the standards had good reasons to bar this use, because many
> runtime environments used segmentation and unsigned segment offsets. On a
> 286 you could get into quite a mess with out of array reference tricks.
>
>   
>> variable with the address of the start. I was more familiar with the B 
>> stuff, I wrote both the interpreter and the code generator+library for 
>> the 8080 and GE600 machines. B on MULTICS, those were the days... :-D
>>     
>
> B on Honeywell L66, so that may well have been a relative of your code
> generator ?
>
>   
Probably the Bell Labs one. I did an optimizer on the Pcode which caught 
jumps to jumps, then had separate 8080 and L66 code generators into GMAP 
on the GE and the CP/M assembler or the Intel (ISIS) assembler for 8080. 
There was also an 8085 code generator using the "ten undocumented 
instructions" from the Dr Dobbs article. GE actually had a contract with 
Intel to provide CPUs with those instructions, and we used them in the 
Terminet(r) printers.

Those were the days ;-)

-- 
Bill Davidsen <davidsen@....com>
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark 


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