Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754180AbXLCBH2 (ORCPT ); Sun, 2 Dec 2007 20:07:28 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751576AbXLCBHU (ORCPT ); Sun, 2 Dec 2007 20:07:20 -0500 Received: from mail.tmr.com ([64.65.253.246]:38969 "EHLO gaimboi.tmr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750717AbXLCBHT (ORCPT ); Sun, 2 Dec 2007 20:07:19 -0500 Message-ID: <47535A80.6010904@tmr.com> Date: Sun, 02 Dec 2007 20:23:12 -0500 From: Bill Davidsen Organization: TMR Associates Inc, Schenectady NY User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.8) Gecko/20061105 SeaMonkey/1.0.6 MIME-Version: 1.0 To: Alan Cox CC: David Newall , Jan Engelhardt , Xavier Bestel , KOSAKI Motohiro , Ben.Crowhurst@stellatravel.co.uk, linux-kernel@vger.kernel.org Subject: Re: Kernel Development & Objective-C References: <474EAD18.6040408@stellatravel.co.uk> <1196416960.20567.205.camel@skunk.anacadf.mentorg.com> <20071130190742.4B7C.KOSAKI.MOTOHIRO@jp.fujitsu.com> <1196418013.20567.211.camel@skunk.anacadf.mentorg.com> <47501C86.1020907@davidnewall.com> <47509D56.7010605@tmr.com> <20071130234013.446f14ef@the-village.bc.nu> <4751A77A.9050204@tmr.com> <20071201181859.346b3e03@the-village.bc.nu> In-Reply-To: <20071201181859.346b3e03@the-village.bc.nu> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1760 Lines: 42 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 "Woe unto the statesman who makes war without a reason that will still be valid when the war is over..." Otto von Bismark -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/