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From Geir Magnusson Jr <g...@pobox.com>
Subject Re: [classlib] unmodified generic GNU Classpath JVM can now run Classlib "hello world"
Date Wed, 12 Apr 2006 10:47:17 GMT
WOO!

Weldon Washburn wrote:
> I just uploaded a new zip file to JIRA Harmony-318 that contains the
> mods to Harmony Classlib that will allow it to run on an unmodified
> generic GNU Classpath JVM.
> 
> Some of the issues encountered:
> 
> 1)
> libtool was not behaving.  So, I gave up and used raw ld.
> 2)
> dlopen() refused to load the output of ld. Google turned up help pages
> that showed dlopen() only likes files ending in *.a
> 3)
> Once dlopen() was able to open the shared lib containing the native
> method, gdb was getting lost.  Googling the web again turned up a
> magic input arg to ld called "--enable-auto-image-base".  Apparently
> gdb internals are stepping on the same virtual addr as the newly
> loaded lib?? In any case, the  --enable.... worked around it.
> 4)
> There was real difficulty lining up the native method's incoming
> arguments.  Finally I declared the native method with input arguments
> (int a1, int a2, int a3, int a4).  Then passed the character to be
> printed in all four arg slots.  Surprise! The second arg of the C
> routine actually held the correct argument.  So the native method was
> modified to print just a2.  It works fine.
> 
> Question for  SableVM/JCHEVM guys:  Did I miss the documentation on
> lining up native method args?  Can you point me to the correct place
> to figure out how to do this?
> 
> Also, I modified files in Harmony Classlib's native-src directory. 
> This might mean we need to add an additional level below
> enhanced/gnuclasspathadapter/.  Something like
> enhanced/gnuclasspathadapter/native-src...  Another issue is that
> different GNU Classpath JVMs may require different name decoration and
> different build options.  Two ways of handling this are 1) add a
> subdirectory for each JVM that contains the code that is unique to the
> jvm and 2) use #ifdefs and make file options to handle the
> differences.
> 
> 
> 
> --
> Weldon Washburn
> Intel Middleware Products Division
> 
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> 


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