RE: [Sablevm-user] bug report -- cannot run 'HelloWorld' test

[Purtell, A. <And...@NA...>]

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Let me explain my interest in SableVM:

I have been looking at the OpenJIT project recently (see
http://www.openjit.org). Essentially, OpenJIT allows the majority of the
JIT to be implemented as Java classes, which lends itself to a number of
useful things such as runtime extension and specialization. The current
OpenJIT prototype runs on a modified Sun classic JVM. I'm looking to
"port" (read further) OpenJIT to an unencumbered JVM. Since SableVM is
GPLed, this is perfect. OpenJIT itself is not GPLed, so this work would
be a bottom-up reimplementation, anyway.

About how far away from running HelloWorld is SableVM?

More importantly, is this something that fits into the design of SableVM?
E.g. there would need to be a few hooks in the interpreter to support a
JIT, especially a self-bootstrapping one. Just for purposes of example,
this could be something as simple as:

    /* invoke method code */
    (*obj->method->invoke)(args);

where normally 'invoke' points to 'int interpret_method (...)', but once
a native method has been compiled, this pointer would be changed to 'int
native_method (void * code, ...)'. Also, the JIT would need to store some
per-method state, presumably hanging off a 'void * jit_priv' member in
the appropriate struct. Etc.


Andrew Purtell
NAI Labs at Network Associates, Inc.
Los Angeles, CA
PGP Fingerprint: 5A21 10DB 92B0 CE20 80B4  90D7 A89C D464 AA0A A616

The difference between theory and practice in practice is larger 
than the difference between theory and practice in theory. -- Steve
Crocker

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