where to report vm crashes? (while running Moose tests)

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> Yes.  RTL is essentially an assembler for an abstract machine with readable
> names for registers.  Arguably the Cog back-end assembler is an RTL.  It has
> abstract registers (ReceiverResultReg, ClassReg etc), and abstract
> operations (e.g. MoveR:R:).  To do marshalling you need only define argument
> registers (floating-point and integer, an empty set on the x86), return
> registers, the stack pointer, and maybe the frame pointer, plus a basic set
> of data manipulation instructions.  Then either define these as numeric
> constants so that the JIT interprets sequences of numbers, or strings, so
> that the JIT uses string matching (the former is of course faster and
> slimmer).  The JIT maps these abstract instructions and register names into
> concrete machine code and register numbers.
>