[TUHS] B Source Code

Doug McIlroy doug at cs.dartmouth.edu
Thu Sep 14 13:48:44 AEST 2017


> Check out:  ybc: a compiler for B <https://github.com/Leushenko/ybc>

>From a historical standpoint, a plain B compiler lacks a very important
attribute of B in Unix. Yes, B presaged some C syntax. But its shining
property was that it produced threaded code, for which both compact
and expanded runtime support was available. The latter had software
paging. Thus B transcended the limited physical memory of the early
PDP-11s.

If you can't compile something, you can't run it.  A prime example was B
itself. Without software paging it would not have been able to recompile
itself, and Unix would not have been self-supporting.

Doug


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