Re: EXECUTE implementation in native-code systems

On 17/03/2025 5:12 pm, Anton Ertl wrote:

dxf <dxforth@gmail.com> writes:

Would you agree 'nest-sys' are peculiar to colon definitions.  That
EXECUTE is a different class of function.  It's not doing a 'call'
as such and not leaving anything on the 'return stack'?

 
That's certainly the case for threaded-code implementations.
 
For native-code implementations the implementation of EXECUTE is
usually an indirect call; sometimes an indirect tail-call, i.e. a
jump.
...

Yes.  Also for optimizing native-code it may be 'xt EXECUTE' itself will
be optimized away.  Since the Standard doesn't specify a nest-sys in
relation to EXECUTE we can safely assume there isn't one?  If not, when
would it be an issue?