I am using Kaffe for a research project in school where I am adding a bytecode to some .class files. It's a new bytecode and I'm trying to make the changes to the JIT to account for the new bytecode, but coming across some trouble.
I started out making changes to the interpreter. Mostly, it involved copying/pasting INVOKESTATIC in kaffe.def and adding a couple asm(...) statements. But, it turns out I need to use the JIT, which is not so straightforward. I've been working on it some and think I have an idea of how I need to do things differently, but debugging is going to be tough. As a rudimentary way of debugging, I have been trying to find a way to dump the JITted method so I could look at that, but haven't been able to find a good way to do that.
See the xdebugging support (FAQ.xdebugging) for a way to generate debugging information in jitted code siutable for gdb.
You can take a look at the emitted code from the jitter by configuring and building kaffe with --enable-debug and using kaffe -vmdebug JIT to run your classes.
I expect implementing the new code could be done really cleanly (and quickly) by someone who really understands how the JIT is implemented. I'm just having a tough time figuring that out.
See FAQ.jit3 for a nice overview of how jit3 works.
If you can help me out some, I'd really appreciate it. If I get it all figured out, I'd be willing to write up some documentation on how I did what I'm working on so if/when other people try to do something similar they could suffer a little less than me.
That would be very welcome!
About my environment:
My PC is intel/linux
Kaffe is compiled to alpha/digital unix
I'm running the JVM on an alpha simulator on the intel machine
This makes debugging much tougher because if I run gdb I'm debugging the simulator, not kaffe. I might be able to run gdb on the simulator, but I'd like to avoid trying to set that up unless absolutely necessary. It took me long enough to get kaffe running on it.
Out of curiosity: There is an alpha simulator for intel macines? Is it free software?
If you want access to real Alpha hardware, check out HP-Compaq's TestDrive project. You can sign up for online access to alpha-linux, alpha-osf (and so on ..) hardware.
cheers, dalibor topic
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