Subject:
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docs for pcode
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 17 Jun 1996 15:40:10 GMT
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Original-From:
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Randy Sargent <rsargent@newtonlabs.comAVOIDSPAM>
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Viewed:
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1554 times
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> Does anyone know where I can get the definitions of the virtual machine
> and bytecodes used by Interactive C?
> I am thinking of creating a smalltalk-like language for the Handyboard.
If you're interested in learning what the various pcodes do, or in making a
new development environment which backends to the pcodes, I'd recommend
looking at "pcodesim.c" in the libs directory of the IC sources. This is a
fairly straightforward implementation of the pcode instruction set in C,
and is useful both as a reference to the pcodes, and also as a good backend
to try first for your development environment (it's much easier to debug).
The code looks sort of like this:
case 2*Padd2 : b=POP2; a=POP2; PUSH2(a + b); break;
case 2*Psub2 : b=POP2; a=POP2; PUSH2( a - b); break;
case 2*Pmult2 : b=POP2; a=POP2; PUSH2( a * b); break;
case 2*Pdiv2 : b=POP2; a=POP2; PUSH2( a / b); break;
...
case 2*Ppush2: PUSH2( FETCH2); break;
case 2*Ppush4: PUSH4( FETCH4); break;
Pretty easy to understand, I hope.
-- Randy
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