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java/3602: Problems with bytes
- To: gcc-gnats at gcc dot gnu dot org
- Subject: java/3602: Problems with bytes
- From: Anthony Green <green at cygnus dot com>
- Date: Sat, 7 Jul 2001 02:52:11 -0700
>Number: 3602
>Category: java
>Synopsis: Problems with bytes
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Sat Jul 07 02:56:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator: Anthony Green
>Release: 3.1 20010705 (experimental)
>Organization:
>Environment:
System: Linux fencer.cygnus.com 2.2.12-20smp #1 SMP Mon Sep 27 10:34:45 EDT 1999 i686 unknown
Architecture: i686
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../gcc/configure --enable-language=c,c++,java --enable-threads --prefix=/horton/green/net/i : (reconfigured)
>Description:
gcj is having problems with bytes. See the attached program. I'm seeing..
OK
Bad
-73
That last number should be 0xB7. -73 is 0xFFFFFFB7. :-(
I don't think there's any work-around.
>How-To-Repeat:
Compile the following and run...
public class Bytes {
public static void foo (byte b)
{
if (b == (byte)0xB7)
{
System.out.println ("OK");
}
switch (b)
{
case INVOKESPECIAL:
System.out.println ("Match");
default:
System.out.println ("Bad");
}
System.out.println (b);
}
public static void main (String args[])
{
foo (INVOKESPECIAL);
}
public static final byte
PUTSTATIC = (byte)0xB3,
GETFIELD = (byte)0xB4,
PUTFIELD = (byte)0xB5,
INVOKEVIRTUAL = (byte)0xB6,
INVOKESPECIAL = (byte)0xB7,
INVOKESTATIC = (byte)0xB8,
INVOKEINTERFACE = (byte)0xB9,
XXXUNUSEDXXX = (byte)0xBA,
NEW = (byte)0xBB,
NEWARRAY = (byte)0xBC,
ANEWARRAY = (byte)0xBD,
ARRAYLENGTH = (byte)0xBE,
ATHROW = (byte)0xBF;
}
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: