2020-08-08 08:08:05 -04:00
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Stack underflow and overflow: In each native word involving
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PSP popping, we check whether the stack is big enough. If it's
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not we go in "uflw" (underflow) error condition, then abort.
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We don't check RSP for underflow because the cost of the check
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is significant and its usefulness is dubious: if RSP isn't
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tightly in control, we're screwed anyways, and that, well
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before we reach underflow.
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Overflow condition happen when RSP and PSP meet somewhere in
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the middle. That check is made at each "next" call.
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