Re: Stack, register, message based or hybrid for virtual machine?

Ulrich Hobelmann <u.hobelmann@web.de> writes:
>Vis Mike wrote:
>> I was thinking of some kind of hybrid. Anybody have any thoughts?
>> I'll post the complete code if interested, just wanted to brush on the
>> subject first.
>
>Just add those registers you need for certain things, use the stack
>for everything else.


The typical hybrid for an Algol-style language is to have the stack
for values within expressions, and have directly accessible locals for
local variables; there are some implicit registers around (e.g., VM
instruction pointer, stack pointer). E.g., the JavaVM takes this
approach. Allocating locals on a non-indexable stack is hard (at
least if you are interested in efficiency).


- anton
--
M. Anton Ertl
anton@mips.complang.tuwien.ac.at
http://www.complang.tuwien.ac.at/anton/home.html

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