October 2024
Intermediate to advanced
272 pages
6h 54m
English
Content preview from Seven Obscure Languages in Seven Weeks
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Demystifying Vectored Execution
From the modern-day terminology perspective, vectored execution in Forth is neither vectored nor execution, yet it exists, and it’s a unique feature in Forth. In the core of vectored execution lies an execution token (previously promised).
An execution token (xt) is a fragment of compiled Forth code—a compiled word. Forth enters compile mode when you type a colon : and leaves when you type a semicolon ;. Everything between : and ;, except the word name, is converted into a token. Then the token is combined with the name and stored in the dictionary. In this previously presented example, INVERT IF DROP -1 THEN becomes an execution token, and FIX becomes its dictionary name:
| | : FIX ( n flag -- n1 ) INVERT ... |
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