Right, so I get that, and I think so do other people in the small Ruby compiler community. It's just a much larger problem in Ruby due to the size and complexity of the standard library and the presence of more non-local effects (like accessing dynamic caller frames is often required). It's possibly so large that it's not reasonable to do it like that and people are looking for other options, like Truffle's PE. That's why it hasn't been achieved yet - it's not because anyone is unaware of common VM techniques.
Another big problem JavaScript doesn't have is that user C extensions are very often on the critical path in Ruby, so you must be able to optimise through them somehow. I don't think JavaScriptCore has any solutions for that we should be trying?
Another big problem JavaScript doesn't have is that user C extensions are very often on the critical path in Ruby, so you must be able to optimise through them somehow. I don't think JavaScriptCore has any solutions for that we should be trying?