QScheme [1] has apparently been abandoned since 2000, and it looks like its VM has never been fully functional. Guile-VM seems much more mature actually. However, that of STklos is fully functional and it seems to be pretty close to Guile-VM (similar instruction set).
Cool, sounds like you're well on top of the field.
Hang on, I thought the instructions were byte code ... How many levels of byte code are there, and how do they differ?
Bytecode is just the binary representation of a sequence of instructions, no more.
However, the compiler does use _two_ intermediate languages when compiling Scheme to VM "assembly":
Scheme -> GHIL -> GLIL -> assembly
(where GHIL stands for "Guile's High-level Intermediate Language" and GLIL stands for "Guile's Low-level Intermediate Language"). The former is pretty close to Scheme while the latter is closer to the VM's assembly. I think the goal was to make Guile-VM easily usable for other languages as well. Fun. ;-)
So where is the "biggest" jump here? Would it be correct to say something like GHIL is a good target for all Lisp-like languages; and GLIL is a more general target that allows for more different languages?
Regards,
Neil
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