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Showing content from https://bugs.ruby-lang.org/issues/18968 below:

Misc #18968: Run MJIT under a forked Ruby process - Ruby

An interesting project if you are changing the interface could be to write a generic JIT interface, which any JIT could plug into. At the moment we have custom C code to plug in MJIT and YJIT - an interface could reduce that C code and enable more experimentation with JITs.

In Java, this is called JVMCI - the JVM Compiler Interface.

https://openjdk.org/jeps/243

Yeah. Ever since I created llrb.gem, I've sometimes thought about it. Like what the description of JEP 243 says, JIT needs to know about VM data structures, which are currently just part of C code in vm.c. If we provide that and make jit_exec pluggable, that'd be the minimum common requirement for CRuby JITs. Chances are I might end up achieving it this time by making MJIT written in Ruby because everything will be dynamically accessible and monkey-patchable.


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