Re: [Swarm-Support] Mac OSX and Java

[Bill Northcott]

On 30/03/2004, at 6:30 PM, Stephen Marsland wrote:
> Hi. This is probably something very simple that I'm missing, but here  
> goes.
> I've downloaded the rather wonderful Mac OSX Panther packages by Bill  
> Northcott and they have installed fine. I can happily compile and run  
> objective C programs.
> However, for the java programs it is a little different.
> I can compile OKusing javacswarm, but when I try and run it I get the  
> following output:
>
> $ javaswarm StartHeatbugs
> objc: Both /usr/lib/libobjc.A.dylib and  
> /usr/local/swarm2.2/lib/libswarm.0.dylib have implementations of class  
> Protocol.
> objc: Using implementation from  
> /usr/local/swarm2.2/lib/libswarm.0.dylib.
> objc: Both /usr/lib/libobjc.A.dylib and  
> /usr/local/swarm2.2/lib/libswarm.0.dylib have implementations of class  
> Object.
> objc: Using implementation from  
> /usr/local/swarm2.2/lib/libswarm.0.dylib.
> Version -1601961796 doesn't match runtime protocol version 2
> /usr/local/swarm2.2/bin/javaswarm: line 1:   637 Abort trap             
>   APPHOME=/System/Library/Frameworks/JavaVM.framework  
> DYLD_LIBRARY_PATH=/System/Library/Frameworks/JavaVM.framework/ 
> Libraries::/usr/X11R6/lib:/usr/lib:/usr/local/hdf5_1.6.1/lib:/usr/ 
> local/png_1.2.5/lib:/usr/local/swarm2.2/lib:/usr/local/tcl8.4.5/lib:/ 
> usr/local/tcl8.4.5  
> CLASSPATH='.:/usr/local/swarm2.2/share/swarm/swarm.jar:/usr/local/ 
> swarm2.2/share/swarm/kawa.jar:/System/Library/Frameworks/ 
> JavaVM.framework/Classes/classes.jar:'  
> /System/Library/Frameworks/JavaVM.framework/Commands/java  
> 'StartHeatbugs'
>
> Has anybody seen anything similar and solved it?
I don't think you are missing anything.  I doubt very much that the  
Java API is usable on MacOS X.

In particular it should fail for any method where the return value is a  
floating point number, a single character or a short int.  It might  
work for methods which return structures, pointers or integers.

The reason for this is buried in the guts of gcc and particularly in  
the builtin functions which are used by Swarm and anything that uses  
the forward facility of the GNU Objective-C runtime.  The functions are  
broken on almost all RISC processors.  As a result Java Swarm is broken  
and I trying to work out the easiest way to fix it.

Apple does not have this problem because they implement forwarding with  
a different mechanism in their runtime.

Bill Northcott