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Mon Jun 30 21:33:57 EDT 2014

Forth and shallow binding

A typical way to work around limitation of forth is to use a bunch of
"current" objects.  This is actively encouraged in Thinking Forth[1].

The interesting part here is that shallow binding or dynamic variables
are actively discouraged in languages like Scheme and basically
anything that came later.  I can only recall emacs lisp as a shallow
binding language that has actually survived into modern times...

Basically this is "state machine oriented" programming: rely on
non-reentrant code to configure a global state machine and have it do
a trick.  The stack is then in practice only used to perform "very
intermediate" state, not all intermediate state (as it is too hard to
access deep, old intermediates).

I guess I just need to embrace it when writing Staapl code.  It's too
hard to write properly isolated code without named indirection / late
binding (i.e. "structs" or "objects").

[1] http://www.forthfreak.net/thinking-forth.pdf



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