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Re: [Classpath] Re: Question about Boolean


From: C. Scott Ananian
Subject: Re: [Classpath] Re: Question about Boolean
Date: Thu, 19 Jul 2001 22:11:32 -0400 (EDT)

On Thu, 19 Jul 2001, Jeff Sturm wrote:

> (I know someone who once had a usable libgcj runtime in 28KB of memory.
> I'll grant that that takes a lot of hacking anyway... he didn't even have
> a String class in his runtime.)

okay, how about:

class Boolean {
 Class TYPE = VMLoader.BooleanTYPE;
}

with VMLoader on gcj being something like:
class VMLoader {
 Class BooleanTYPE = boolean.class;
}
and VMLoader on sane VMs being:
class VMLoader { 
 Class BooleanTYPE = VMLoader.loadPrimitiveClass("boolean");
}

This has a total time over head of *nine loads*, executed *once* at the
beginning of the program.  Total space overhead is *nine words* (eleven,
if you need a header for VMLoader).  I think even your 28K system can get
by with this.

I don't see why portability is so difficult.
 --s

Marxist operative DC SEAL Team 6 Echelon cracking Nazi Delta Force 
Seattle immediate LA Leitrim Clinton RNC Dictionary justice milita 
              ( http://lesser-magoo.lcs.mit.edu/~cananian )
 --
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 minutes before his troops shot 13 unarmed Kent State students, killing 4.
 --
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#!/usr/bin/perl -w
# 526-byte qrpff, Keith Winstein and Marc Horowitz <address@hidden>
# MPEG 2 PS VOB file on stdin -> descrambled output on stdout
# arguments: title key bytes in least to most-significant order
$_='while(read+STDIN,$_,2048){$a=29;$c=142;if((@a=unx"C*",$_)[20]&48){$h=5;
$_=unxb24,join"",@b=map{xB8,unxb8,chr($_^$a[--$h+84])address@hidden;s/...$/1$&/;$d=
unxV,xb25,$_;$b=73;$e=256|(ord$b[4])<<9|ord$b[3];$d=$d>>8^($f=($t=255)&($d
>>12^$d>>4^$d^$d/8))<<17,$e=$e>>8^($t&($g=($q=$e>>14&7^$e)^$q*8^$q<<6))<<9
,$_=(map{$_%16or$t^=$c^=($m=(11,10,116,100,11,122,20,100)[$_/16%8])&110;$t
^=(72,@z=(64,72,$a^=12*($_%16-2?0:$m&17)),$b^=$_%64?12:0,@z)[$_%8]}(16..271))
[$_]^(($h>>=8)+=$f+(~$g&$t))address@hidden"C*",@a}';s/x/pack+/g;eval




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