May 2024
Intermediate to advanced
536 pages
17h 10m
English
Content preview from Compilers: Principles and Practice by Pearson
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Intermediate Code 247
CODE-TMP = Mem(TMP)
JMP (CODE-TMP)
CALL: Call a subroutine A:
push LP to stack
increment TMP to next item
LP = TMP
do NEXT
RET: Return from list-subroutine:
LP = TOS
do NEXT
8.6.4 Token Threaded Code
Direct Threaded code cannot be simply transported from one machine to another, because it
contains the code addresses that vary from machine to machine. Token threaded code uses a fixed
virtual machine instruction encoding, allowing code portability at the price of a table lookup
(that maps the instruction token to its code address) in each NEXT. Indirect threading and token
threading are orthogonal, so they can be combined ...
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