Many many many years ago in the compiler writing class, my professor Chris Thomson, use to say if "in doubt, add another pass". He also stressed that in the future, unlike the limited IBM 370 with only 16MB of memory, systems would have lots of memory and so adding more passes would not be expensive.
Chris is mentioned here: https://en.wikipedia.org/wiki/FLACC He wrote the entire Algol-68 compiler in IBM 370 assembler. It was a time when we were given so many minutes of computer time for a course. AlgolW would compile 1000 line program in a fraction of a second. FLACC might take a whole second to compile the same thing. AlgolW and Fortran would spit out an error and then the next 50 errors would be there because of the first. So in the long run you would submit and compile many times to get a program running. With FLACC if you were dumb enough to only fix the first error the other exact same 49 would show up again. But fix all 49 and likely you wouldn't see any others. So that longer compile time came with the benefit of perfect error reporting. To create a compiler that can do that is not easy. John > -----Original Message----- > From: andy pugh [mailto:bodge...@gmail.com] > Sent: July-12-21 3:00 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] 'automatically' go halfway between 2 points > > On Mon, 12 Jul 2021 at 22:55, John Dammeyer <jo...@autoartisans.com> wrote: > > > That's so wrong on so many levels really. Either continue the previous > > section or throw up a "Repeated Section" warning or error. > If it knows to ignore it then it also has the ability to do throw up an error. > > It doesn't actively ignore it. It searches the file for [HALUI], reads > all the entries, and then stops looking when it sees the next > [SECTION] > > -- > atp > "A motorcycle is a bicycle with a pandemonium attachment and is > designed for the especial use of mechanical geniuses, daredevils and > lunatics." > � George Fitch, Atlanta Constitution Newspaper, 1912 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
