hg: valhalla/valhalla/jdk: Initial implementation of metacircular interpreter
brian.goetz at oracle.com
Sun Aug 23 15:12:02 UTC 2015
> my guess, let say you want to prototype the u-opcodes of John's talk at JVMLS.
Yep, that's basically the motivation. (Plus, it was fun.) If we want
to experiment with new bytecodes, its orders of magnitude cheaper to do
the initial experiments in javac + metacircular interpreter than to do
it in HotSpot.
> Btw, there is a complementary approach which is to use the existing bytecode interpreter and encode for every u-opcode a cascade of if/else on the type, the bytecode verifier will bark but you can deactivate it (the JIT may also crash if it is too curious a look the code of never executed branches).
Yes. This might end up being a "Phase II" experimental strategy, after
the MCE-based Phase I experiment runs its course. But we don't want to
start there, in part for the reasons you cite (must disable verifier,
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