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Groups > comp.lang.java.programmer > #32412
| From | Eternal Hope <laughingspam99@gmail.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: is the java compiler written in c |
| Date | 2015-08-22 19:59 +0100 |
| Organization | A noiseless patient Spider |
| Message-ID | <mragmv$o00$1@dont-email.me> (permalink) |
| References | (3 earlier) <mr6j27$4et$1@dont-email.me> <mr8ni4$p8f$1@speranza.aioe.org> <mr9nqt$m9d$3@dont-email.me> <mr9oqe$mn$1@dont-email.me> <mrad2k$468$1@dont-email.me> |
On 22/08/2015 18:55, Martin Gregorie wrote: > On Sat, 22 Aug 2015 13:11:41 +0100, Eternal Hope wrote: > >> On 22/08/2015 12:53, Martin Gregorie wrote: >>> On Fri, 21 Aug 2015 22:42:11 -0400, Arne Vajhøj wrote: >>> >>>> To write an OS you need to get real close to the hardware and allow a >>>> lot of funky stuff. >>>> >>> Hardware emulation too. I started to write a 6809 emulator in Java, but >>> moved the project to C when I discovered what a pain it was going to be >>> to emulate the registers (8 or 16 bit unsigned arithmetic but with the >>> option to treat the LHS bit as the sign) It was *much* easier to simply >>> declare the registers as 'unsigned short' or 'unsigned byte' than it >>> was to fight with Java's insistence on signed arithmetic. >> >> >> https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html >> >> unsigned ops agogo > > Integer is a bit too long for what I need: all the 6809 registers are 8 > or 16 bits. Byte and Short are the obvious Java classes to use but, then > again, Integer,Byte and Short all only do a subset of unsigned > arithmetic. Since none of them do unsigned addition or subtraction and > none of them have any facilities for treating the MSB as a sign or > reporting overflow - all of which are needed to emulate the registers, it > remains much easier to do it in C. > > This is just an observation that Java is unsuitable for some > applications, not a criticism. Heh heh, no problem here, criticise away, just put your tin hat on and avoid the shrapnel, although I don't think anyone would say that Java is perfect ... I mean *how many* classes in the latest distro. I preferred it when you had to include jars to get extended functionality. Made it more geeky some how :-) Also Java doesn't seem to inspire people to starry eyed zealotry in the same way that C seems to. > Yeah, I know I could use native code for this sort of stuff but, as much > of the reason for using Java was to make the emulator fully portable, > dropping bits of native C into the mix would probably have impacted that > aim. > > Meanwhile C fits the bill very nicely. > > -- Laughing Spam Fritter
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is the java compiler written in c gdotone@gmail.com - 2015-08-19 12:41 -0700
Re: is the java compiler written in c Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-08-19 16:06 -0400
Re: is the java compiler written in c gdotone@gmail.com - 2015-08-19 16:12 -0700
Re: is the java compiler written in c Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-20 11:08 +0000
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-20 20:34 -0400
Re: is the java compiler written in c Eric Sosman <esosman@comcast-dot-net.invalid> - 2015-08-20 07:44 -0400
Re: is the java compiler written in c e.d.programmer@gmail.com - 2015-08-20 06:36 -0700
Re: is the java compiler written in c gdotone@gmail.com - 2015-08-20 18:58 -0700
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-20 22:13 -0400
Re: is the java compiler written in c g g <gdotone@gmail.com> - 2015-08-20 19:57 -0700
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-21 21:25 -0400
Re: is the java compiler written in c Eternal Hope <laughingspam99@gmail.com> - 2015-08-21 08:15 +0100
Re: is the java compiler written in c e.d.programmer@gmail.com - 2015-08-21 06:56 -0700
Re: is the java compiler written in c Eternal Hope <laughingspam99@gmail.com> - 2015-08-21 15:32 +0100
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-08-21 16:51 -0500
Re: is the java compiler written in c Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-21 23:32 +0000
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-08-21 23:35 -0500
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-21 22:39 -0400
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-08-21 22:42 -0500
Re: is the java compiler written in c Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-22 11:41 +0000
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-08-22 10:03 -0500
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-30 22:03 -0400
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-08-31 01:09 -0500
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-09-03 20:46 -0400
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-09-04 10:01 -0500
Re: is the java compiler written in c Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-22 11:37 +0000
Re: is the java compiler written in c Eternal Hope <laughingspam99@gmail.com> - 2015-08-22 12:56 +0100
Re: is the java compiler written in c Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-22 18:04 +0000
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-08-22 14:27 -0500
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-30 22:06 -0400
Re: is the java compiler written in c Eternal Hope <laughingspam99@gmail.com> - 2015-08-22 10:31 +0100
Re: is the java compiler written in c BGB <cr88192@hotmail.com> - 2015-08-23 01:31 -0500
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-21 22:42 -0400
Re: is the java compiler written in c Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-22 11:53 +0000
Re: is the java compiler written in c Eternal Hope <laughingspam99@gmail.com> - 2015-08-22 13:11 +0100
Re: is the java compiler written in c Martin Gregorie <martin@address-in-sig.invalid> - 2015-08-22 17:55 +0000
Re: is the java compiler written in c Eternal Hope <laughingspam99@gmail.com> - 2015-08-22 19:59 +0100
Re: is the java compiler written in c Gene Wirchenko <genew@telus.net> - 2015-08-26 09:44 -0700
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-30 22:11 -0400
Re: is the java compiler written in c Arne Vajhøj <arne@vajhoej.dk> - 2015-08-19 19:35 -0400
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