Date: Fri, 30 May 2003 17:24:13 -0400 (EDT)
From: C. Scott Ananian
To: jsr14-prototype-comments@sun.com
Subject: Oddities in multi-dim array variance.

Why are the classfile signature strings for
   Number[+][=]
and
   Number[=][+]
identical?

The fact that this typechecks is probably related:
    Number[-][=] na4 = new Number[1][-];
Is this correct?  I've always assumed that the constructor and the
declaration mirrored each other; that is, that the 'first' brackets in the
declaration corresponded to the 'first' brackets in the constructor; that
is, corresponded to the 'outermost' array (the array with elements of type
"array of Number").  In any case, *one of* these statements should not
type check (although both do, in the 2.0 prototype):

  void foo(Number[=][+] na1, Number[+][=] na2) {
     na1[0] = new Number[1];
     na2[0] = new Number[1];
  }

Also unclear is the interaction with dynamic arrays.  This typechecks:
    Number[=][] n0 = new Number[1][];
    { n0[0] = new Number[1];
      n0[0] = new Integer[1];
      n0[0][0] = new Float(0.0);
    }
So I'm assuming this is parsed as a static array of dynamic arrays.
So why isn't this allowed?
   Number[+][] = new Integer[1][];

Finally, it is interesting that the signature generated for this
declaration:
   Number[+][=][+] nd0/* = new Number[1][1][1]*/;
is:
   [=[+[+Ljava/lang/Number;
That surely is not correct.
  --scott

cracking Ortega C4 SLBM strategic DNC OVER THE HORIZON RADAR operative 
insurgent hack security mail drop radar Semtex planning Justice assassinate 
                         ( http://cscott.net/ )

Date: Fri, 30 May 2003 14:26:51 -0700
From: Neal M Gafter
To: C. Scott Ananian
Cc: jsr14-prototype-comments@sun.com
Subject: Re: Oddities in multi-dim array variance.

Just nasty little bugs.

-Neal

Date: Fri, 30 May 2003 17:31:33 -0400 (EDT)
From: C. Scott Ananian
To: Neal M Gafter
Cc: jsr14-prototype-comments@sun.com
Subject: Re: Oddities in multi-dim array variance.

On Fri, 30 May 2003, Neal M Gafter wrote:

> Just nasty little bugs.

OK.  Just so I can get my signature-parser correct, though, can you
confirm that
   [=[+Ljava/lang/Number;
is the correct signature for
   Number[=][+] na;
(and, for that matter, for the type of
   new Number[10][+]
)?

Thanks.
 --scott

Nazi Seattle supercomputer assassination SSBN 743 non-violent protest 
United Nations CIA AK-47 SEAL Team 6 Serbian Sabana Seca $400 million in gold bullion 
                         ( http://cscott.net/ )

Date: Fri, 30 May 2003 14:34:58 -0700
From: Neal M Gafter
To: C. Scott Ananian
Cc: jsr14-prototype-comments@sun.com
Subject: Re: Oddities in multi-dim array variance.

Yes, that's right.

-Neal