THE INTERPRETER AND RETURN STACK ----------------------------------------------------
(2) What goes in the codeword for the words which are written in FORTH?
DOCOL -- the FORTH interpreter function
QUADRUPLE:
+------------------+
| codeword |
+------------------+ DOUBLE:
| addr of DOUBLE ---------------> +------------------+
+------------------+ %eax -> | addr of DOCOL |
%esi -> | addr of DOUBLE | +------------------+
+------------------+ | addr of DUP |
| addr of EXIT | +------------------+
+------------------+ | etc. |
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