10 Mar
2023
10 Mar
'23
5:30 p.m.
ron(a)ronnatalie.com wrote:
Multilevel breaks are as bad as goto with regard to
structure violation.
Back when I was in compilers (so long ago, that it was the DEC PDP-10
FORTRAN compiler(*)) my recall is that break/continue never generated
irreducible flow graphs, as goto can:
https://en.wikipedia.org/wiki/Control-flow_graph#Reducibility
I still remember the days when you could find C code written by PASCAL
programmers, littered with condition variables on loops, and if
statements to not execute the tail of the loop body if the loop
condition was false.
(*) The FORTRAN compiler was written in BLISS-10, which had labeled
statements, and a "leave <label>" construct which was only legal
inside the labeled statement:
http://www.bitsavers.org/pdf/dec/pdp10/TOPS10/DEC-10-LBRMA-A-D_BLISS-10_Pro…