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- Stack management
-
- The Parameter stack (PS) is maintained by SP and the Return
- stack (RS) is maintained by IX. This allows us to generally use
- push and pop freely because PS is the most frequently used.
- However, this causes a problem with routine calls: because in
- Forth, the stack isn't balanced within each call, our return
- offset, when placed by a CALL, messes everything up. This is
- one of the reasons why we need stack management routines below.
- IX always points to RS' Top Of Stack (TOS)
-
- This return stack contain "Interpreter pointers", that is a
- pointer to the address of a word, as seen in a compiled list of
- words.
-
- (cont.)
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