gij gcj-dbtool and questions

[Jakob Praher <jpraher at yahoo dot de>]

hi all,

i am using gcc-head with then new-abi stuff.

wanted to try to get started by using pnuts, a scripting language for
java to run with gij.

so i did the following:

gcj -findirect-dispatch -shared -o libpnuts.so pnuts.jar
gcj-dbtool -n pnuts.db
gcj-dbtool -a pnuts.jar libpnuts.so

gij -Dgnu.gcj.precompiled.db.path=./pnuts.db pnuts.tool.Main

prints:

Exception in thread "main" java.lang.NoClassDefFoundError:
pnuts.tools.Main
   at gnu.java.lang.MainThread.run()
(/home/jp/gcc-head/lib/libgcj.so.6.0.0)
   at _Jv_ThreadRun(java.lang.Thread)
(/home/jp/gcc-head/lib/libgcj.so.6.0.0)
   at _Jv_RunMain(java.lang.Class, byte const, int, byte const, boolean)
(/home/jp/gcc-head/lib/libgcj.so.6.0.0)
   at main (/home/jp/gcc-head/lib/libgij.so.0.0.0)
   at __libc_start_main (/lib/tls/i686/cmov/libc-2.3.2.so)

and doing a 
strace 2>&1 -e open gij -Dgnu.gcj.precompiled.db.path=./pnuts.db
pnuts.tool.Main | grep pnuts.db

yields that pnuts.db doesn't get loaded anyway - so how should it now
about the mapping ....

I found that the only file that uses the gnu.gcj.precompiled.db.path
property is java/lang/VMCompiler.java.
But I have to confess that I didn't look more into the details. I am
hoping to save some time and that you can give some details and status
information. 

BTW: Tom, I am interested in the gcjx stuff, your blog sounds pretty
interesting to me. When are you planing on integrating in as a
gcc-frontend... 
I am thinking about using relocation symbols and a more GOT/PLT like
approach for doing BC compatible linking, also with an application to
lazy procedure linking. I have invested pretty much time into the elf
dynamic linking approach, since I was very interested how it all worked.
I am currently writing a little documentation about that and have to
talk to one of my profs, perhaps I can do some sort of this as a diploma
thesis, which would be rather nice. The otable and atable stuff is
rather straightforwared to implement in pure elf, but the itable thing,
is a little bit more tricky, I suppose. After all that calls
_Jv_LookupInterfaceMethodIdx, which is a bit more tricky to implement as
elf sections.... 
Anyways I am providing more information on that, if you are interested.

Whishing you a mary chrismas, if that applies to you :-).

-- 
Jakob Praher <jpraher@yahoo.de>