Re: [Vm-dev] Does Cog Interpreter state and cycle differ from the    standard VM ?

gettimothy gettimothy at
Tue Nov 26 22:02:34 UTC 2013

Thank you Eliot.

'Spaghetti Stack' I love it...

I want to get the standard VM under my belt first--walk before run and all that.

t, tim, or timothy is fine. 't' is easier to type and will not conflict with Tim Rowledge



---- On Tue, 26 Nov 2013 13:26:33 -0800 Eliot Miranda<eliot.miranda at> wrote ---- 

 Hi Tim(othy?).

On Tue, Nov 26, 2013 at 1:22 PM, gettimothy <gettimothy at> wrote:
 Does Cog Interpreter state and cycle differ from the standard VM ?

Yes.  Quite a lot.  The best overview is  Rationale for closures is in the posts named "Closure Overview" & "Closure Bytecodes".  HTH.

Details are not needed, just a heads up so that when I do get to Cog work, I make it a point to study them.

>From the Blue Book, here is the definition of Interpreter State and Cycle:

       Interpreter State:
      1. The CompiledMethod whose bytecodes ar being executed.
     2. The location of the next bytecode to be executed in that CompiledMethod: i.e its /instruction pointer/
     3. The receiver and arguments of the message that invoked the CompiledMethod.
      4. Any temporary variables needed by the CompiledMethod.
     5. a stack.

       Interpreter Cycle:
     1. fetch the bytecode from the CompiledMethod indicated by the instruction pointer.
     2. Increment the instruction pointer.
      3. Perform the function specified by the bytecode.





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