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