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Re: [Classpath] java.lang.Class inner class methods


From: C. Scott Ananian
Subject: Re: [Classpath] java.lang.Class inner class methods
Date: Thu, 2 Aug 2001 03:44:40 -0400 (EDT)

On Wed, 1 Aug 2001, Patrick Doyle wrote:

> Does anyone have a hint as to how the inner class methods of
> java.lang.Class (getDeclaringClass, getClasses, etc.) would be implemented
> by a JVM?  Don't they depend on how the Java compiler implements inner
> classes?  AFAIK the JVM isn't aware of inner classes at all.

There are Attributes defined in the Classfile format which (ought to)
provide this information for inner classes.  Presumably the information in
the Attribute gets squirreled away somewhere for the implementations of
these methods to use.

I ignore these attributes in my java runtime, because i'm lazy.
 --s

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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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