On 2018-08-01, at 16:23:25, Gord Tomlin wrote: > > Here's one to rail about: branching to a hard coded offset from the current > location, e.g., > B *+12 > > This is a tire fire waiting to happen. > Better-featured assemblers provide symbols with local scope for this purpose.
&SYSNDX is a boon here. How many "B *+12" in SYS1.MACLIB ought to be replaced with &SYSNDX. But this clutters the cross-reference listing. Long ago I worked with a simple Pascal compiler. It didn't generate assembler code, but branches to hard-coded offsets were endemic, and caused "tire fire" when I changed the code generation. Finally, I took the effort to ferret out every one to defer calculating the offset and backfill from the target. Mostly piggybacked on existing logic for resolving GOTO displacements. -- gil
